LTM8058 3.1VIN to 31VIN Isolated Module DC/DC Converter with LDO Post Regulator FEATURES n n n n n n n n n DESCRIPTION 2kV AC Isolated Module Converter (Tested to 3kVDC) UL60950 Recognized File E464570 Wide Input Voltage Range: 3.1V to 31V VOUT1 Output: Up to 440mA (VIN = 24V, VOUT1 = 2.5V) 2.5V to 13V Output Range VOUT2 Low Noise Linear Post Regulator: Up to 300mA 1.2V to 12V Output Range Current Mode Control Programmable Soft-Start User Configurable Undervoltage Lockout Low Profile (9mm x 11.25mm x 4.92mm) BGA Package The LTM(R)8058 is a 2kV AC isolated flyback Module(R) (micromodule) DC/DC converter with LDO post regulator. Included in the package are the switching controller, power switches, transformer, LDO, and all support components. Operating over an input voltage range of 3.1V to 31V, the LTM8058 supports an output voltage range of 2.5V to 13V, set by a single resistor. There is also a linear post regulator whose output voltage is adjustable from 1.2V to 12V as set by a single resistor. Only output and input capacitors are needed to finish the design. Other components may be used to control the soft-start control and biasing. The LTM8058 is packaged in a thermally enhanced, compact (9mm x 11.25mm x 4.92mm) overmolded ball grid array (BGA) package suitable for automated assembly by standard surface mount equipment. The LTM8058 is available with SnPb or RoHS compliant terminal finish. APPLICATIONS n n n L, LT, LTC, LTM, Linear Technology, the Linear logo and Module are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Industrial Sensors Industrial Switches Ground Loop Mitigation TYPICAL APPLICATION 2kV AC Isolated Low Noise Module Regulator Total Output Current vs VIN 330 * RUN VOUT1 5.7V VOUT2 * 2.2F LOW NOISE LDO ADJ2 BYP VOUT- GND 22F 162k VOUT2 5V 10F BIAS 4.7F 6.19k 280 VOUT1 CURRENT (mA) VOUT1 VIN VIN 4.3V TO 29V 230 180 130 SS ADJ1 LTM8058 8058 TA01a 2kV AC ISOLATION 80 0 5 10 20 15 INPUT VOLTAGE (V) 25 30 8058 TA01b 8058fb For more information www.linear.com/LTM8058 1 LTM8058 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW VIN, RUN ...................................................................32V BIAS ...........................................................................VIN ADJ1, SS......................................................................5V VOUT1 Relative to VOUT-........................................... +16V VIN + VOUT1 (Note 2)..................................................36V VOUT2 Relative to VOUT-...........................................+20V ADJ2 Relative to VOUT-..............................................+7V GND to VOUT- Isolation (Note 3).......................... 2kV AC Maximum Internal Temperature (Note 4)............... 125C Maximum Peak Body Reflow Temperature............ 245C Storage Temperature.............................. -55C to 125C ORDER INFORMATION A C PAD OR BALL FINISH LTM8058EY#PBF SAC305 (RoHS) BANK 3 BYP VOUT2 BANK 2 VOUT- BANK 1 VOUT1 D E F BANK 5 VIN G BANK 4 GND RUN ADJ1 H BIAS SS 1 3 4 5 6 7 BGA PACKAGE 38-LEAD (11.25mm x 9mm x 4.92mm) TJMAX = 125C, JA = 23.2C/W, JCbottom = 5.8C/W, JCtop = 23.2C/W, JB = 6.7C/W WEIGHT = 1.1g, VALUES DETERMINED PER JEDEC 51-9, 51-12 2 http://www.linear.com/product/LTM8058#orderinfo PART MARKING* PART NUMBER ADJ2 B DEVICE FINISH CODE PACKAGE TYPE MSL RATING LTM8058Y e1 BGA 3 TEMPERATURE RANGE (Note 4) -40C to 125C LTM8058IY#PBF SAC305 (RoHS) LTM8058Y e1 BGA 3 -40C to 125C LTM8058IY SnPb (63/37) LTM8058Y e0 BGA 3 -40C to 125C LTM8058MPY#PBF SAC305 (RoHS) LTM8058Y e1 BGA 3 -55C to 125C LTM8058MPY SnPb (63/37) LTM8058Y e0 BGA 3 -55C to 125C Consult Marketing for parts specified with wider operating temperature ranges. *Device temperature grade is indicated by a label on the shipping container. Pad or ball finish code is per IPC/JEDEC J-STD-609. * Recommended LGA and BGA PCB Assembly and Manufacturing Procedures: www.linear.com/umodule/pcbassembly * Terminal Finish Part Marking: www.linear.com/leadfree * LGA and BGA Package and Tray Drawings: www.linear.com/packaging 8058fb 2 For more information www.linear.com/LTM8058 LTM8058 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full internal operating temperature range, otherwise specifications are at TA = 25C, RUN = 12V (Note 4). PARAMETER CONDITIONS Minimum Input DC Voltage BIAS = VIN, RUN = 2V BIAS Open, RUN = 2V l l MIN VOUT1 DC Voltage RADJ1 = 12.4k RADJ1 = 6.98k RADJ1 = 3.16k l 4.75 TYP 2.5 5 12 VIN Quiescent Current VRUN = 0V Not Switching 850 VOUT1 Line Regulation 6V VIN 31V, IOUT = 0.15A, RUN = 2V 1.7 MAX UNITS 3.1 4.3 V V 5.25 V V V 1 A A % VOUT1 Load Regulation 0.05A IOUT 0.2A, RUN = 2V 1.5 % VOUT1 Ripple (RMS) IOUT = 0.1A, 1MHz BW 20 mV Input Short-Circuit Current VOUT1 Shorted 30 mA RUN Pin Input Threshold RUN Pin Rising RUN Pin Current VRUN = 1V VRUN = 1.3V 1.18 SS Threshold 1.24 1.30 V 2.5 0.1 A A 0.7 V -10 A SS Sourcing Current SS = 0V BIAS Current VIN = 12V, BIAS = 5V, ILOAD1 = 100mA Minimum BIAS Voltage (Note 5) ILOAD1 = 100mA LDO (VOUT2) Minimum Input DC Voltage (Note 6) 1.8 VOUT2 Voltage Range VOUT1 = 16V, RADJ2 Open, No Load (Note 6) VOUT1 = 16V, RADJ2 = 41.2k, No Load (Note 6) 1.22 15.8 ADJ2 Pin Voltage VOUT1 = 2V, IOUT2 = 1mA (Note 6) VOUT1 = 2V, IOUT2 = 1mA (Note 6) 8 mA 3.1 l 1.19 1.22 V 2.3 V V V V V 1.25 VOUT2 Line Regulation 2V < VOUT1 < 16V, IOUT2 = 1mA (Note 6) 1 5 mV VOUT2 Load Regulation VOUT1 = 5V, 10mA IOUT2 300mA (Note 6) 2 10 mV LDO Dropout Voltage IOUT2 = 10mA (Note 6) IOUT2 = 100mA (Note 6) IOUT2 = 300mA (Note 6) VOUT2 Ripple (RMS) CBYP = 0.01F, IOUT2 = 300mA, BW = 100Hz to 100kHz (Note 6) Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: VIN + VOUT1 is defined as the sum of: (VIN - GND) + (VOUT1 - VOUT-) Note 3: The LTM8058 isolation is tested at 3kV DC for one second. Note 4: The LTM8058E is guaranteed to meet performance specifications from 0C to 125C. Specifications over the -40C to 125C internal temperature range are assured by design, characterization and correlation with statistical process controls. LTM8058I is guaranteed to meet 0.25 0.34 0.43 20 V V V VRMS specifications over the full -40C to 125C internal operating temperature range. The LTM8058MP is guaranteed to meet specifications over the full -55C to 125C internal operating temperature range. Note that the maximum internal temperature is determined by specific operating conditions in conjunction with board layout, the rated package thermal resistance and other environmental factors. Note 5: This is the BIAS pin voltage at which the internal circuitry is powered through the BIAS pin and not the integrated regulator. See BIAS Pin Considerations for details. Note 6: VRUN = 0V (Flyback not running), but the VOUT2 post regulator is powered by applying a voltage to VOUT1. 8058fb For more information www.linear.com/LTM8058 3 LTM8058 TYPICAL PERFORMANCE CHARACTERISTICS as in Table 1 (TA = 25C). VOUT1 = 2.5V BIAS = 5V Efficiency vs Output Current 80 12VIN EFFICIENCY (%) 65 60 55 70 24VIN 65 60 55 200 100 300 OUTPUT CURRENT (mA) 0 50 400 80 0 12VIN 100 200 300 OUTPUT CURRENT (mA) 60 50 400 Input Current vs Output Current VOUT1 = 2.5V 80 BIAS = 5V 12VIN 65 400 90 75 70 100 200 300 OUTPUT CURRENT (mA) 0 8058 G03 VOUT1 = 12V BIAS = 5V 80 24VIN EFFICIENCY (%) EFFICIENCY (%) 65 Efficiency vs Output Current 85 75 24VIN 70 8058 G02 Efficiency vs Output Current VOUT1 = 8V BIAS = 5V 12VIN 55 8058 G01 85 VOUT1 = 5V BIAS = 5V 75 12VIN INPUT CURRENT (mA) EFFICIENCY (%) 24VIN 50 VOUT1 = 3.3V BIAS = 5V 75 70 Efficiency vs Output Current 80 EFFICIENCY (%) Efficiency vs Output Current 75 Unless otherwise noted, operating conditions are 24VIN 70 65 60 60 55 55 70 12VIN 60 50 24VIN 40 30 20 0 50 200 150 250 100 OUTPUT CURRENT (mA) 50 300 0 50 100 8058 G04 60 24VIN 50 40 30 20 100 12VIN 80 24VIN 60 40 20 10 0 0 VOUT1 = 8V BIAS = 5V 160 140 12VIN 70 INPUT CURRENT (mA) INPUT CURRENT (mA) 80 Input Current vs Output Current 180 VOUT1 = 5V BIAS = 5V 120 200 100 300 OUTPUT CURRENT (mA) 400 8058 G07 0 400 8058 G06 Input Current vs Output Current 140 VOUT1 = 3.3V BIAS = 5V 90 200 100 300 OUTPUT CURRENT (mA) 1 8058 G05 Input Current vs Output Current 100 0 200 150 OUTPUT CURRENT (mA) INPUT CURRENT (mA) 50 10 12VIN 120 100 24VIN 80 60 40 20 0 100 200 300 OUTPUT CURRENT (mA) 400 8058 G08 0 0 50 100 150 200 250 OUTPUT CURRENT (mA) 300 8058 G09 8058fb 4 For more information www.linear.com/LTM8058 LTM8058 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise noted, operating conditions are as in Table 1 (TA = 25C). Input Current vs Output Current Bias Current vs Output Current VOUT1 = 2.5V 8 BIAS = 5V VOUT1 = 12V BIAS = 5V 180 7 BIAS CURRENT (mA) 12VIN 120 100 24VIN 80 60 12VIN 8 24VIN 6 5 4 3 3 20 1 0 0 0 200 100 300 OUTPUT CURRENT (mA) 1 400 BIAS CURRENT (mA) 8 24VIN 6 4 2 0 VOUT1 = 8V BIAS = 5V 10 10 12VIN 8 6 4 2 100 200 0 400 300 OUTPUT CURRENT (mA) 0 MAXIMUM OUTPUT CURRENT (mA) 200 100 0 VOUT1 = 2.5V VOUT1 = 3.3V VOUT1 = 5V 0 5 10 15 VIN (V) 20 25 6 4 2 0 400 300 30 8058 G16 24VIN 8 50 100 150 200 250 OUTPUT CURRENT (mA) 0 300 0 50 100 150 OUTPUT CURRENT (mA) Minimum Required Load vs Input Voltage 45 BIAS = 5V FOR VIN 5V BIAS = VIN FOR VIN < 5V 300 200 100 0 VOUT1 = 8V VOUT1 = 12V 0 5 10 15 VIN (V) 20 25 200 8058 G15 Maximum Output Current vs VIN 400 12VIN 10 8058 G14 Maximum Output Current vs VIN BIAS = 5V FOR VIN 5V BIAS = VIN FOR VIN < 5V VOUT1 = 12V BIAS = 5V 12 24VIN 8058 G13 500 Bias Current vs Output Current 14 BIAS CURRENT (mA) VOUT1 = 5V BIAS = 5V 400 200 100 300 OUTPUT CURRENT (mA) 8058 G12 Bias Current vs Output Current 12 12VIN 0 8058 G11 Bias Current vs Output Current 12 BIAS CURRENT (mA) 4 2 8058 G10 MAXIMUM OUTPUT CURRENT (mA) 5 1 200 24VIN 6 2 100 50 150 OUTPUT CURRENT (mA) 12VIN 7 40 0 VOUT1 = 3.3V BIAS = 5V 9 MAXIMUM REQUIRED LOAD (mA) INPUT CURRENT (mA) 160 140 Bias Current vs Output Current 10 9 BIAS CURRENT (mA) 200 BIAS = 5V FOR VIN 5V BIAS = VIN FOR VIN < 5V 40 35 30 25 20 15 10 VOUT1 = 2.5V VOUT1 = 3.3V VOUT1 = 5V 5 30 0 0 10 20 30 40 INPUT VOLTAGE (V) 8058 G17 8058 G18 8058fb For more information www.linear.com/LTM8058 5 LTM8058 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise noted, operating conditions are as in Table 1 (TA = 25C). Minimum Required Load vs Input Voltage MINIMUM REQUIRED LOAD (mA) 25 Typical Output Ripple 100mA Output Current, VIN = 12V BIAS = 5V FOR VIN 5V BIAS = VIN FOR VIN < 5V NO CSS VOUT1 5mV/DIV 20 CSS = 0.01F CSS = 0.1F 1V/DIV 15 VOUT2 500V/DIV 10 5 VOUT1 = 8V VOUT1 = 12V* 0 200s/DIV 100mA RESISTIVE LOAD Input Current vs VIN, VOUT1 Shorted Input Current vs VIN, VOUT2 Shorted 8058 G21 25 30 10 15 20 INPUT VOLTAGE (V) 8058 G19 *SEE APPLICATIONS INFORMATION SECTION FOR DISCUSSION OF 12VOUT MINIMUM LOAD 5 Typical Switching Frequency vs Output Current Stock DC1988A 900 800 700 500 INPUT CURRENT (mA) 12VIN 600 5VIN 400 300 200 80 225 70 200 60 175 50 40 30 150 125 100 75 20 100 0 8058 G20 500ns/DIV MEASURED ON DC1988 WITH ADDIONAL 1F AND BNC ATTACHED TO OUTPUT TERMINALS. C7 = 0.1F. USED HP461A 150MHz AMPLIFIER, SET TO 40dB GAIN. INPUT CURRENT (mA) 0 SWITCHING FREQUENCY (kHz) DC1988 VOUT1 Start-Up Behavior for Different CSS Values 0 50 200 150 100 OUTPUT CURRENT (mA) 10 250 0 4 8 12 16 20 VIN (V) 24 28 50 32 0 10 8058 G23 20 VIN (V) 30 40 8058 G24 8058 G22 Junction Temperature Rise vs Load Current 0.7 0.6 125C 0.5 25C 0.4 0.3 -40C 0.2 0.1 0 7 6 5 4 3 3.3VIN 5VIN 12VIN 24VIN 2 50 100 150 200 250 VOUT2 LOAD CURRENT (mA) 300 8058 G25 0 0 50 VOUT2 = 1.5V 9 8 1 0 10 VOUT2 = 1.2V 9 TEMPERATURE RISE (C) VOUT2 DROPOUT VOLTAGE (V) 10 VOUT2 = 3.3V Junction Temperature Rise vs Load Current 100 150 200 250 VOUT2 LOAD CURRENT (mA) 300 8058 G26 TEMPERATURE RISE (C) VOUT2 Dropout 8 7 6 5 4 3 3.3VIN 5VIN 12VIN 24VIN 2 1 0 0 50 100 150 200 250 VOUT2 LOAD CURRENT (mA) 300 8058 G27 8058fb 6 For more information www.linear.com/LTM8058 LTM8058 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise noted, operating conditions are as in Table 1 (TA = 25C). 8 7 6 5 4 3 3.3VIN 5VIN 12VIN 24VIN 2 1 0 0 50 100 150 200 250 VOUT2 LOAD CURRENT (mA) 7 6 5 4 3 16 10 8 6 3.3VIN 5VIN 12VIN 24VIN 0 0 50 100 150 200 250 VOUT2 LOAD CURRENT (mA) 300 8058 G31 TEMPERATURE RISE (C) TEMPERATURE RISE (C) 12 2 50 100 150 200 250 VOUT2 LOAD CURRENT (mA) 8 6 4 0 300 16 14 12 12 10 8 6 0 3.3VIN 5VIN 12VIN 24VIN 0 50 50 100 150 200 250 VOUT2 LOAD CURRENT (mA) 300 8058 G30 Junction Temperature Rise vs Load Current 14 2 0 8058 G29 VOUT2 = 8V 4 3.3VIN 5VIN 12VIN 24VIN 2 Junction Temperature Rise vs Load Current VOUT2 = 5V 4 0 8058 G28 Junction Temperature Rise vs Load Current 14 3.3VIN 5VIN 12VIN 24VIN 2 0 VOUT2 = 3.3V 10 8 1 300 12 VOUT2 = 2.5V 9 TEMPERATURE RISE (C) TEMPERATURE RISE (C) 10 VOUT2 = 1.8V 9 Junction Temperature Rise vs Load Current 100 150 200 250 VOUT2 LOAD CURRENT (mA) 300 8058 G32 TEMPERATURE RISE (C) 10 Junction Temperature Rise vs Load Current TEMPERATURE RISE (C) Junction Temperature Rise vs Load Current VOUT2 = 12V 10 8 6 4 3.3VIN 5VIN 12VIN 24VIN 2 0 0 50 100 150 200 VOUT2 LOAD CURRENT (mA) 250 8058 G33 8058fb For more information www.linear.com/LTM8058 7 LTM8058 PIN FUNCTIONS VOUT1 (Bank 1): VOUT1 and VOUT- comprise the isolated output of the LTM8058 flyback stage. Apply an external capacitor between VOUT1 and VOUT-. Do not allow VOUT- to exceed VOUT1. VOUT- (Bank 2): VOUT- is the return for both VOUT1 and VOUT2. VOUT1 and VOUT- comprise the isolated output of the LTM8058. In most applications, the bulk of the heat flow out of the LTM8058 is through the GND and VOUT- pads, so the printed circuit design has a large impact on the thermal performance of the part. See the PCB Layout and Thermal Considerations sections for more details. Apply an external capacitor between VOUT1 and VOUT-. VOUT2 (Bank 3): The output of the secondary side linear post regulator. Apply the load and output capacitor between VOUT2 and VOUT-. See the Applications Information section for more information on output capacitance and reverse output characteristics. BYP (Pin B2): The BYP pin is used to bypass the reference of the LDO to achieve low noise performance from the linear post regulator. The BYP pin is clamped internally to 0.6V relative to VOUT-. A small capacitor from VOUT2 to this pin will bypass the reference to lower the output voltage noise. A maximum value of 0.01F can be used for reducing output voltage noise to a typical 20VRMS over a 100Hz to 100kHz bandwidth. If not used, this pin must be left unconnected. RUN (Pin F3): A resistive divider connected to VIN and this pin programs the minimum voltage at which the LTM8058 will operate. Below 1.24V, the LTM8058 does not deliver power to the secondary. Above 1.24V, power will be delivered to the secondary and 10A will be fed into the SS pin. When RUN is less than 1.24V, the pin draws 2.5A, allowing for a programmable hysteresis. Do not allow a negative voltage (relative to GND) on this pin. GND (Bank 4): This is the local ground of the LTM8058 primary. In most applications, the bulk of the heat flow out of the LTM8058 is through the GND and VOUT- pads, so the printed circuit design has a large impact on the thermal performance of the part. See the PCB Layout and Thermal Considerations sections for more details. ADJ1 (Pins G7): Apply a resistor from this pin to GND to set the output voltage VOUT1 relative to VOUT-, using the recommended value given in Table 1. If Table 1 does not list the desired VOUT1 value, the equation VIN (Bank 5): VIN supplies current to the LTM8058's internal regulator and to the integrated power switch. These pins must be locally bypassed with an external, low ESR capacitor. may be used to approximate the value. To the seasoned designer, this exponential equation may seem unusual. The equation is exponential due to nonlinear current sources that are used to temperature compensate the regulation. ADJ2 (pin A2): This is the input to the error amplifier of the secondary side LDO post regulator. This pin is internally clamped to 7V. The ADJ2 pin voltage is 1.22V referenced to VOUT- and the output voltage range is 1.22V to 12V. Apply a resistor from this pin to VOUT-, using the equation RADJ2 = 608.78/(VOUT2 - 1.22)k. If the post regulator is not used, leave this pin floating. BIAS (Pin H5): This pin supplies the power necessary to operate the LTM8058. It must be locally bypassed with a low ESR capacitor of at least 4.7F. Do not allow this pin voltage to rise above VIN. ( ) R ADJ1 = 28.4 VOUT1-0.879 k SS (Pin H6): Place a soft-start capacitor here to limit inrush current and the output voltage ramp rate. Do not allow a negative voltage (relative to GND) on this pin. 8058fb 8 For more information www.linear.com/LTM8058 LTM8058 BLOCK DIAGRAM VOUT1 VIN VOUT2 * * 0.1F 499k 1F LOW NOISE LDO ADJ2 BYP RUN BIAS* SS VOUT- CURRENT MODE CONTROLLER ADJ1 GND 8058 BD *DO NOT ALLOW BIAS VOLTAGE TO BE ABOVE VIN OPERATION The LTM8058 is a stand-alone isolated flyback switching DC/DC power supply that can deliver up to 440mA of output current. This module provides a regulated output voltage programmable via one external resistor from 2.5V to 13V. It is also equipped with a high performance linear post regulator. The input voltage range of the LTM8058 is 3.1V to 31V. Given that the LTM8058 is a flyback converter, the output current depends upon the input and output voltages, so make sure that the input voltage is high enough to support the desired output voltage and load current. The Typical Performance Characteristics section gives several graphs of the maximum load versus VIN for several output voltages. A simplified block diagram is given. The LTM8058 contains a current mode controller, power switching element, power transformer, power Schottky diode, a modest amount of input and output capacitance, and a high performance linear post regulator. The LTM8058 has a galvanic primary to secondary isolation rating of 2kV AC. This is verified by applying 3kV DC between the primary to secondary for 1 second. Note that the 2kV AC isolation is verified by a 3kV DC test. The peak voltage of a 2kV AC waveform is 2.83kV DC, so 3kV DC is applied. For details please refer to the Isolation, Working Voltage and Safely Compliance section. The LTM8058 is a UL 60950 recognized component. An internal regulator provides power to the control circuitry. The bias regulator normally draws power from the VIN pin, but if the BIAS pin is connected to an external voltage higher than 3.1V, bias power will be drawn from the external source, improving efficiency. VBIAS must not exceed VIN. The RUN pin is used to turn on or off the LTM8058, disconnecting the output and reducing the input current to 1A or less. The LTM8058 is a variable frequency device. For a fixed input and output voltage, the frequency increases as the load increases. For light loads, the current through the internal transformer may be discontinuous. The post regulator is a high performance 300mA low dropout regulator with micropower quiescent current and shutdown. The device is capable of supplying 300mA at a dropout voltage of 430mV. Output voltage noise can be lowered to 20VRMS over a 100Hz to 100kHz bandwidth with the addition of a 0.01F reference bypass capacitor. Additionally, this reference bypass capacitor will improve transient response of the regulator, lowering the settling time for transient load conditions. The linear regulator is protected against both reverse input and reverse output voltages. For more information www.linear.com/LTM8058 8058fb 9 LTM8058 APPLICATIONS INFORMATION For most applications, the design process is straight forward, summarized as follows: 1. Look at Table 1a (or Table 1b, if the post linear regulator is used) and find the row that has the desired input range and output voltage. 2. Apply the recommended CIN, COUT1, COUT2, RADJ1, RADJ2 and CBYP if required. 3. Connect BIAS as indicated, or tie to an external source up to 15V or VIN, whichever is less. While these component combinations have been tested for proper operation, it is incumbent upon the user to verify proper operation over the intended system's line, load and environmental conditions. Bear in mind that the maximum output current may be limited by junction temperature, the relationship between the input and output voltage magnitude and polarity and other factors. Please refer to the graphs in the Typical Performance Characteristics section for guidance. Capacitor Selection Considerations The CIN, COUT1 and COUT2 capacitor values in Table 1 are the minimum recommended values for the associated operating conditions. Applying capacitor values below those indicated in Table 1 is not recommended, and may result in undesirable operation. Using larger values is generally acceptable, and can yield improved dynamic response, if it is necessary. Again, it is incumbent upon the user to verify proper operation over the intended system's line, load and environmental conditions. Ceramic capacitors are small, robust and have very low ESR. However, not all ceramic capacitors are suitable. X5R and X7R types are stable over temperature and applied voltage and give dependable service. Other types, including Y5V and Z5U have very large temperature and voltage coefficients of capacitance. In an application circuit they may have only a small fraction of their nominal capacitance resulting in much higher output voltage ripple than expected. A final precaution regarding ceramic capacitors concerns the maximum input voltage rating of the LTM8058. A ceramic input capacitor combined with trace or cable inductance forms a high-Q (underdamped) tank circuit. If the LTM8058 circuit is plugged into a live supply, the input voltage can ring to much higher than its nominal value, possibly exceeding the device's rating. This situation is easily avoided; see the Hot-Plugging Safely section. LTM8058 Table 1a. Recommended Component Values and Configuration for Specific VOUT1 Voltages (TA = 25C) VIN VOUT1 VBIAS CIN COUT1 RADJ1 3.1V to 31V 2.5V 3.1V to 15V or Open 2.2F, 50V, 1206 100F, 6.3V, 1210 12.4k 3.1V to 31V 3.3V 3.1V to 15V or Open 2.2F, 50V, 1206 100F, 6.3V, 1210 10k 3.1V to 29V 5V 3.1V to 15V or Open 2.2F, 50V, 1206 22F, 16V, 1210 6.98k 3.1V to 26V 8V 3.1V to 15V or Open 2.2F, 50V, 1206 22F, 10V, 1206 4.53k 3.1V to 24V 12V 3.1V to 15V or Open 2.2F, 25V, 0805 10F, 16V, 1210 3.16k/8.2pF* 9V to 15V 2.5V VIN 2.2F, 50V, 1206 100F, 6.3V, 1210 12.4k 9V to 15V 3.3V VIN 2.2F, 50V, 1206 47F, 6.3V, 1210 10k 9V to 15V 5V VIN 2.2F, 50V, 1206 22F, 16V, 1210 6.98k 9V to 15V 8V VIN 2.2F, 50V, 1206 22F, 10V, 1206 4.53k 9V to 15V 12V VIN 2.2F, 25V, 0805 10F, 16V, 1210 3.16k 18V to 31V 2.5V 3.1V to 15V or Open 2.2F, 50V, 1206 100F, 6.3V, 1210 12.4k 18V to 31V 3.3V 3.1V to 15V or Open 2.2F, 50V, 1206 47F, 6.3V, 1210 10k 18V to 29V 5V 3.1V to 15V or Open 2.2F, 50V, 1206 22F, 16V, 1210 6.98k 18V to 26V 8V 3.1V to 15V or Open 2.2F, 50V, 1206 22F, 10V, 1206 4.53k 18V to 24V 12V 3.1V to 15V or Open 2.2F, 50V, 1206 10F, 16V, 1210 3.16k/8.2pF* Note: Do not allow BIAS to exceed VIN, a bulk input capacitor is required. If BIAS is open, the minimum VIN is 4.3V. *Connect 3.16k in parallel with 8.2pF from ADJ1 to GND 10 For more information www.linear.com/LTM8058 8058fb LTM8058 APPLICATIONS INFORMATION LTM8058 Table 1b. Recommended Component Values and Configuration for Specific VOUT2 Voltages (TA = 25C) VIN VOUT1 VOUT2 VBIAS CIN COUT1 COUT2 RADJ1 RADJ2 3.1V to 31V 2.3V 1.2V 3.1V to 15V or Open 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 133k Open 3.1V to 31V 2.3V 1.5V 3.1V to 15V or Open 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 133k 2.32M 3.1V to 31V 2.3V 1.8V 3.1V to 15V or Open 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 13.3k 1.07M 3.1V to 31V 3.08V 2.5V 3.1V to 15V or Open 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 10.5k 487k 3.1V to 31V 3.92V 3.3V 3.1V to 15V or Open 2.2F, 50V, 1206 47F, 6.3V, 1210 10F, 6.3V, 1206 8.66k 294k 3.1V to 29V 5.7V 5V 3.1V to 15V or Open 2.2F, 50V, 1206 22F, 16V, 1210 10F, 6.3V, 1206 6.19k 162k 3.1V to 26V 8.85V 8V 3.1V to 15V or Open 2.2F, 50V, 1206 22F, 10V, 1206 10F, 10V, 1206 4.12k 88.7k 3.1V to 21V 13V 12V 3.1V to 15V or Open 2.2F, 25V, 0805 10F, 16V, 1210 22F, 16V, 1206 2.94k/22pF* 56.2k 9V to 15V 2.3V 1.2V VIN 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 133k Open 9V to 15V 2.3V 1.5V VIN 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 133k 2.32M 9V to 15V 2.3V 1.8V VIN 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 13.3k 1.07M 9V to 15V 3.08V 2.5V VIN 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 10.5k 487k 9V to 15V 3.92V 3.3V VIN 2.2F, 50V, 1206 47F, 6.3V, 1210 10F, 6.3V, 1206 8.66k 294k 9V to 15V 5.7V 5V VIN 2.2F, 50V, 1206 22F, 16V, 1210 10F, 6.3V, 1206 6.19k 162k 9V to 15V 8.85V 8V VIN 2.2F, 50V, 1206 22F, 10V, 1206 10F, 10V, 1206 4.12k 88.7k 9V to 15V 13V 12V VIN 2.2F, 25V, 0805 10F, 16V, 1210 22F, 16V, 1206 2.94k/22pF* 56.2k 18V to 31V 2.3V 1.2V 3.1V to 15V or Open 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 133k Open 18V to 31V 2.3V 1.5V 3.1V to 15V or Open 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 133k 2.32M 18V to 31V 2.3V 1.8V 3.1V to 15V or Open 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 13.3k 1.07M 18V to 31V 3.08V 2.5V 3.1V to 15V or Open 2.2F, 50V, 1206 100F, 6.3V, 1210 10F, 6.3V, 1206 10.5k 487k 18V to 31V 3.92V 3.3V 3.1V to 15V or Open 2.2F, 50V, 1206 47F, 6.3V, 1210 10F, 6.3V, 1206 8.66k 294k 18V to 29V 5.7V 5V 3.1V to 15V or Open 2.2F, 50V, 1206 22F, 16V, 1210 10F, 6.3V, 1206 6.19k 162k 18V to 26V 8.85V 8V 3.1V to 15V or Open 2.2F, 50V, 1206 22F, 10V, 1206 10F, 10V, 1206 4.12k 88.7k Note: Do not allow BIAS to exceed VIN, a bulk input capacitor is required. If BIAS is open, the minimum VIN is 4.3V. *Connect 2.94k in parallel with 22pF from ADJ1 to GND. BIAS Pin Considerations The BIAS pin is the output of an internal linear regulator that powers the LTM8058's internal circuitry. It is set to 3V and must be decoupled with a low ESR capacitor of at least 4.7F. The LTM8058 will run properly without applying a voltage to this pin, but will operate more efficiently and dissipate less power if a voltage between 3.1V and VIN is applied. At low VIN, the LTM8058 will be able to deliver more output current if BIAS is 3.1V or greater. Up to 31V may be applied to this pin, but a high BIAS voltage will cause excessive power dissipation in the internal circuitry. For applications with an input voltage less than 15V, the BIAS pin is typically connected directly to the VIN pin. For input voltages greater than 15V, it is preferred to leave the BIAS pin separate from the VIN pin, either powered from a separate voltage source or left running from the internal regulator. This has the added advantage of keeping the physical size of the BIAS capacitor small. Do not allow BIAS to rise above VIN. Soft-Start For many applications, it is necessary to minimize the inrush current at start-up. The built-in soft-start circuit significantly reduces the start-up current spike and output voltage overshoot by applying a capacitor from SS to GND. When the LTM8058 is enabled, whether from VIN reaching a sufficiently high voltage or RUN being pulled high, the LTM8058 will source approximately 10A out of the SS pin. As this current gradually charges the capacitor from SS to GND, the LTM8058 will correspondingly increase the power delivered to the output, allowing for a graceful turn-on ramp. 8058fb For more information www.linear.com/LTM8058 11 LTM8058 APPLICATIONS INFORMATION The LTM8058 isolation is 100% hi-pot tested by tying all of the primary pins together, all of the secondary pins together and subjecting the two resultant circuits to a differential of 3kV DC for one second. This establishes the isolation voltage rating of the LTM8058 component. The isolation rating of the LTM8058 is not the same as the working or operational voltage that the application will experience. This is subject to the application's power source, operating conditions, the industry where the end product is used and other factors that dictate design requirements such as the gap between copper planes, traces and component pins on the printed circuit board, as well as the type of connector that may be used. To maximize the allowable working voltage, the LTM8058 has two columns of solder balls removed to facilitate the printed circuit board design. The ball to ball pitch is 1.27mm, and the typical ball diameter is 0.78mm. Accounting for the missing columns and the ball diameter, the printed circuit board may be designed for a metal-to-metal separation of up to 3.03mm. This may have to be reduced somewhat to allow for tolerances in solder mask or other printed circuit board design rules. For those situations where information about the spacing of LTM8058 internal circuitry is required, the minimum metal to metal separation of the primary and secondary is 0.75mm. To reiterate, the manufacturer's isolation voltage rating and the required working or operational voltage are often different numbers. In the case of the LTM8058, the isolation voltage rating is established by 100% hi-pot testing. The working or operational voltage is a function of the end product and its system level specifications. The actual required operational voltage is often smaller than the manufacturer's isolation rating. The LTM8058 is a UL recognized component under UL 60950, file number E464570. The UL 60950 insulation category of the LTM8058 transformer is Functional. Considering UL 60950 Table 2N and the gap distances stated above, 3.03mm external and 0.75mm internal, the LTM8058 may be operated with up to 250V working voltage in a pollution degree 2 environment. The actual working voltage, insulation category, pollution degree and other critical parameters for the specific end application depend upon the actual environmental, application and safety compliance requirements. It is therefore up to the user to perform a safety and compliance review to ensure that the LTM8058 is suitable for the intended application. VOUT2 Post Regulator VOUT2 is produced by a high performance low dropout 300mA regulator. At full load, its dropout is less than 430mV. Its output is set by applying a resistor from the RADJ2 pin to GND; the value of RADJ2 can be calculated by the equation: R ADJ2 = 608.78 k VOUT2 - 1.22 ADJ1 and Line Regulation For VOUT1 greater than 8V, parasitics in the transformer interacting with the controller cause a localized increase in minimum load. A small capacitor may need to be applied from ADJ1 to GND to ensure proper line regulation. Care must be taken when choosing this capacitor value. Too small or no capacitor will result in poor line regulation; in general, a larger capacitor is needed for higher VOUT1. Too large of a capacitance will require excessive minimum load to maintain regulation. The plots in Figure 1 show LTM8058 line regulation with three different capacitor values applied from ADJ1 to GND. 5 4 3 2 DEVIATION (%) Isolation, Working Voltage and Safety Compliance 1 0 -1 -2 -3 NO CAP 8.2pF CAP 12pF CAP -4 -5 0 6 12 VIN (V) 18 24 8058 F01 Figure 1. VOUT1 Line Regulation vs VIN 8058fb 12 For more information www.linear.com/LTM8058 LTM8058 APPLICATIONS INFORMATION The plots in Figure 2 show the minimum load requirement for the same three capacitors. Carefully choose the appropriate capacitor value for the intended application. MINIMUM REQUIRED LOAD (mA) 25 BIAS = 5V FOR VIN 5V BIAS = VIN FOR VIN < 5V NO CAP 8.2pF CAP 12pF CAP 20 15 10 5 0 0 6 12 18 24 INPUT VOLTAGE (V) 8058 F02 Figure 2. Minimum Required Load vs Input Voltage VOUT1 to VOUT- Reverse Voltage The LTM8058 cannot tolerate a reverse voltage from VOUT1 to VOUT- during operation. If VOUT- raises above VOUT1 during operation, the LTM8058 may be damaged. To protect against this condition, a low forward drop power Schottky diode has been integrated into the LTM8058, anti-parallel to VOUT1/VOUT-. This can protect the output against many reverse voltage faults. Reverse voltage faults can be both steady state and transient. An example of a steady-state voltage reversal is accidentally misconnecting a powered LTM8058 to a negative voltage source. An example of transient voltage reversals is a momentary connection to a negative voltage. It is also possible to achieve a VOUT1 reversal if the load is short circuited through a long cable. The inductance of the long cable forms an LC tank circuit with the VOUT1 capacitance, which drives VOUT1 negative. Avoid these conditions. VOUT2 Post Regulator Bypass Capacitance and Low Noise Performance The VOUT2 linear regulator may be used with the addition of a 0.01F bypass capacitor from VOUT to the BYP pin to lower output voltage noise. A good quality low leakage capacitor, such as a X5R or X7R ceramic, is recommended. This capacitor will bypass the reference of the regulator, lowering the output voltage noise to as low as 20VRMS. Using a bypass capacitor has the added benefit of improving transient response. Safety Rated Capacitors Some applications require safety rated capacitors, which are high voltage capacitors that are specifically designed and rated for AC operation and high voltage surges. These capacitors are often certified to safety standards such as UL 60950, IEC 60950 and others. In the case of the LTM8058, a common application of a safety rated capacitor would be to connect it from GND to VOUT-. To provide maximum flexibility, the LTM8058 does not include any components between GND and VOUT-. Any safety capacitors must be added externally. The specific capacitor and circuit configuration for any application depends upon the safety requirements of the system into which the LTM8058 is being designed. Table 2 provides a list of possible capacitors and their manufacturers. The application of a capacitor from GND to VOUT- may also reduce the high frequency output noise on the output. Table 2. Safety Rated Capacitors MANUFACTURER PART NUMBER DESCRIPTION Murata Electronics GA343DR7GD472KW01L 4700pF, 250V AC, X7R, 4.5mm x 3.2mm Capacitor Johanson Dielectrics 302R29W471KV3E-****-SC 470pF, 250V AC, X7R, 4.5mm x 2mm Capacitor Syfer Technology 1808JA250102JCTSP 100pF, 250V AC, C0G, 1808 Capacitor PCB Layout Most of the headaches associated with PCB layout have been alleviated or even eliminated by the high level of integration of the LTM8058. The LTM8058 is nevertheless a switching power supply, and care must be taken to minimize electrical noise to ensure proper operation. Even with the high level of integration, you may fail to achieve specified operation with a haphazard or poor layout. See 8058fb For more information www.linear.com/LTM8058 13 LTM8058 APPLICATIONS INFORMATION Figure 3 for a suggested layout. Ensure that the grounding and heat sinking are acceptable. ADJ1 VOUT1 LTM8058 A few rules to keep in mind are: 1. Place the RADJ1 and RADJ2 resistors as close as possible to their respective pins. 2. Place the CIN capacitor as close as possible to the VIN and GND connections of the LTM8058. 3. Place the COUT1 capacitor as close as possible to VOUT1 and VOUT-. Likewise, place the COUT2 capacitor as close as possible to VOUT2 and VOUT-. 4. Place the CIN and COUT capacitors such that their ground current flow directly adjacent or underneath the LTM8058. 5. Connect all of the GND connections to as large a copper pour or plane area as possible on the top layer. Avoid breaking the ground connection between the external components and the LTM8058. SS COUT1 BIAS CBIAS VOUT- RUN ADJ2 BYP COUT2 CIN VOUT2 VIN THERMAL/INTERCONNECT VIAS 8058 F03 Figure 3. Layout Showing Suggested External Components, Planes and Thermal Vias 6. Use vias to connect the GND copper area to the board's internal ground planes. Liberally distribute these GND vias to provide both a good ground connection and thermal path to the internal planes of the printed circuit board. Pay attention to the location and density of the thermal vias in Figure 3. The LTM8058 can benefit from the heat sinking afforded by vias that connect to internal GND planes at these locations, due to their proximity to internal power handling components. The optimum number of thermal vias depends upon the printed circuit board design. For example, a board might use very small via holes. It should employ more thermal vias than a board that uses larger holes. twice the nominal input voltage, possibly exceeding the LTM8058's rating and damaging the part. If the input supply is poorly controlled or the user will be plugging the LTM8058 into an energized supply, the input network should be designed to prevent this overshoot. This can be accomplished by installing a small resistor in series to VIN, but the most popular method of controlling input voltage overshoot is adding an electrolytic bulk capacitor to the VIN net. This capacitor's relatively high equivalent series resistance damps the circuit and eliminates the voltage overshoot. The extra capacitor improves low frequency ripple filtering and can slightly improve the efficiency of the circuit, though it can be a large component in the circuit. Hot-Plugging Safely Thermal Considerations The small size, robustness and low impedance of ceramic capacitors make them an attractive option for the input bypass capacitor of the LTM8058. However, these capacitors can cause problems if the LTM8058 is plugged into a live supply (see Linear Technology Application Note 88 for a complete discussion). The low loss ceramic capacitor combined with stray inductance in series with the power source forms an underdamped tank circuit, and the voltage at the VIN pin of the LTM8058 can ring to more than The LTM8058 output current may need to be derated if it is required to operate in a high ambient temperature. The amount of current derating is dependent upon the input voltage, output power and ambient temperature. The temperature rise curves given in the Typical Performance Characteristics section can be used as a guide. These curves were generated by the LTM8058 mounted to a 58cm2 4-layer FR4 printed circuit board. Boards of other sizes and layer count can exhibit different thermal behavior, so 8058fb 14 For more information www.linear.com/LTM8058 LTM8058 APPLICATIONS INFORMATION it is incumbent upon the user to verify proper operation over the intended system's line, load and environmental operating conditions. For increased accuracy and fidelity to the actual application, many designers use FEA to predict thermal performance. To that end, the Pin Configuration section of the data sheet typically gives four thermal coefficients: JA: Thermal resistance from junction to ambient JCbottom: Thermal resistance from junction to the bottom of the product case JCtop: Thermal resistance from junction to top of the product case JCboard: Thermal resistance from junction to the printed circuit board. While the meaning of each of these coefficients may seem to be intuitive, JEDEC has defined each to avoid confusion and inconsistency. These definitions are given in JESD 51-12, and are quoted or paraphrased as follows: JA is the natural convection junction-to-ambient air thermal resistance measured in a one cubic foot sealed enclosure. This environment is sometimes referred to as still air although natural convection causes the air to move. This value is determined with the part mounted to a JESD 51-9 defined test board, which does not reflect an actual application or viable operating condition. JCbottom is the junction-to-board thermal resistance with all of the component power dissipation flowing through the bottom of the package. In the typical Module converter, the bulk of the heat flows out the bottom of the package, but there is always heat flow out into the ambient environment. As a result, this thermal resistance value may be useful for comparing packages but the test conditions don't generally match the user's application. JCtop is determined with nearly all of the component power dissipation flowing through the top of the package. As the electrical connections of the typical Module converter are on the bottom of the package, it is rare for an application to operate such that most of the heat flows from the junction to the top of the part. As in the case of JCbottom, this value may be useful for comparing packages but the test conditions don't generally match the user's application. JCboard is the junction-to-board thermal resistance where almost all of the heat flows through the bottom of the Module converter and into the board, and is really the sum of the JCbottom and the thermal resistance of the bottom of the part through the solder joints and through a portion of the board. The board temperature is measured a specified distance from the package, using a two-sided, two-layer board. This board is described in JESD 51-9. Given these definitions, it should now be apparent that none of these thermal coefficients reflects an actual physical operating condition of a Module converter. Thus, none of them can be individually used to accurately predict the thermal performance of the product. Likewise, it would be inappropriate to attempt to use any one coefficient to correlate to the junction temperature vs load graphs given in the product's data sheet. The only appropriate way to use the coefficients is when running a detailed thermal analysis, such as FEA, which considers all of the thermal resistances simultaneously. A graphical representation of these thermal resistances is given in Figure 4. The blue resistances are contained within the Module converter, and the green are outside. The die temperature of the LTM8058 must be lower than the maximum rating of 125C, so care should be taken in the layout of the circuit to ensure good heat sinking of the LTM8058. The bulk of the heat flow out of the LTM8058 is through the bottom of the module and the BGA pads into the printed circuit board. Consequently a poor printed circuit board design can cause excessive heating, resulting in impaired performance or reliability. Please refer to the PCB Layout section for printed circuit board design suggestions. 8058fb For more information www.linear.com/LTM8058 15 LTM8058 APPLICATIONS INFORMATION JUNCTION-TO-AMBIENT RESISTANCE (JESD 51-9 DEFINED BOARD) CASE (TOP)-TO-AMBIENT RESISTANCE JUNCTION-TO-CASE (TOP) RESISTANCE JUNCTION-TO-BOARD RESISTANCE JUNCTION AMBIENT JUNCTION-TO-CASE CASE (BOTTOM)-TO-BOARD (BOTTOM) RESISTANCE RESISTANCE BOARD-TO-AMBIENT RESISTANCE 8058 F04 MODULE DEVICE Figure 4 TYPICAL APPLICATIONS 3.3V Flyback Converter VOUT2 Maximum Output Current vs VIN 300 VOUT1 * (3.9V) VOUT2 RUN LOW NOISE LDO * 2.2F ADJ2 BYP - VOUT GND VOUT2 3.3V 47F 294k 10F BIAS 4.7F 8.66k OUTPUT CURRENT (mA) VIN VIN 9V TO 15V SS 280 260 240 220 ADJ1 LTM8058 200 8058 TA02a 2kV AC ISOLATION 9 11 10 12 VIN (V) 14 13 15 8058 TA02b 12V Flyback Converter with Low Noise Bypass VOUT2 Maximum Output Current vs VIN 260 VOUT1 * RUN (13V) VOUT2 * 2.2F GND LOW NOISE LDO BYP 10F ADJ2 VOUT- VOUT2 12V 0.01F 10F 56.2k BIAS 4.7F 2.49k 2.2pF SS 220 OUTPUT CURRENT (mA) VIN VIN 5V TO 23V 180 140 100 ADJ1 LTM8058 8058 TA03a 2kV AC ISOLATION 60 5 10 15 20 25 VIN (V) 8058 TA03b 8058fb 16 For more information www.linear.com/LTM8058 LTM8058 TYPICAL APPLICATIONS 3.3V and 2.5V Flyback Converter Total Maximum Output Current vs VIN 450 * RUN * 2.2F 3.1V VOUT1 3.3V VOUT2 LOW NOISE LDO ADJ2 BYP VOUT- GND VOUT2 2.5V 100F 487k 10F BIAS 4.7F 10k SS 400 OUTPUT CURRENT (mA) VOUT1 VIN VIN 3.1V TO 32V 350 300 250 200 150 ADJ1 LTM8058 8058 TA04a 2kV AC ISOLATION 100 8 0 16 24 32 VIN (V) 8058 TA04b PACKAGE DESCRIPTION Pin Assignment Table (Arranged by Pin Number) PIN FUNCTION PIN FUNCTION PIN FUNCTION PIN FUNCTION PIN FUNCTION PIN B1 VOUT2 C1 D1 E1 GND F1 A1 VOUT2 A2 ADJ2 B2 BYP C2 D2 E2 GND F2 A3 VOUT- B3 VOUT- C3 D3 E3 GND F3 B4 VOUT- C4 D4 E4 GND F4 A4 VOUT- - B5 VOUT- C5 D5 E5 GND F5 A5 VOUT B6 VOUT1 C6 D6 E6 GND F6 A6 VOUT1 B7 VOUT1 C7 D7 E7 GND F7 A7 VOUT1 FUNCTION RUN GND GND GND GND PIN G1 G2 G3 G4 G5 G6 G7 FUNCTION PIN FUNCTION VIN H1 VIN VIN H2 VIN H3 GND H4 GND GND H5 BIAS GND H6 SS ADJ1 H7 GND PACKAGE PHOTO 8058fb For more information www.linear.com/LTM8058 17 4 For more information www.linear.com/LTM8058 2.540 SUGGESTED PCB LAYOUT TOP VIEW 1.270 PACKAGE TOP VIEW 0.3175 0.000 0.3175 PIN "A1" CORNER E 1.270 aaa Z 2.540 Y 4.445 3.175 1.905 0.635 0.000 0.635 1.905 3.175 4.445 D X 4.7625 4.1275 aaa Z SYMBOL A A1 A2 b b1 D E e F G H1 H2 aaa bbb ccc ddd eee b1 DETAIL A MAX 5.12 0.70 4.42 0.90 0.66 DIMENSIONS NOM 4.92 0.60 4.32 0.75 0.63 11.25 9.0 1.27 8.89 7.62 0.32 4.00 BALL DIMENSION PAD DIMENSION BALL HT NOTES DETAIL B PACKAGE SIDE VIEW A2 A SUBSTRATE THK 0.37 MOLD CAP HT 4.05 0.15 0.10 0.20 0.30 0.15 TOTAL NUMBER OF BALLS: 38 0.27 3.95 MIN 4.72 0.50 4.22 0.60 0.60 H1 SUBSTRATE A1 ddd M Z X Y eee M Z DETAIL B H2 MOLD CAP ccc Z Ob (38 PLACES) // bbb Z (Reference LTC DWG # 05-08-1925 Rev B) Z 18 Z BGA Package 38-Lead (11.25mm x 9.00mm x 4.92mm) F e 7 5 4 3 2 PACKAGE BOTTOM VIEW 6 1 DETAIL A H G F E D C B A PIN 1 DETAILS OF PIN #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE PIN #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE BALL DESIGNATION PER JESD MS-028 AND JEP95 TRAY PIN 1 BEVEL COMPONENT PIN "A1" 6 ! BGA 38 0517 REV B PACKAGE IN TRAY LOADING ORIENTATION LTMXXXXXX Module PACKAGE ROW AND COLUMN LABELING MAY VARY AMONG Module PRODUCTS. REVIEW EACH PACKAGE LAYOUT CAREFULLY 5. PRIMARY DATUM -Z- IS SEATING PLANE 4 3 2. ALL DIMENSIONS ARE IN MILLIMETERS 6 SEE NOTES NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-1994 b 3 SEE NOTES G LTM8058 PACKAGE DESCRIPTION Please refer to http://www.linear.com/product/LTM8058#packaging for the most recent package drawings. 8058fb 3.810 3.810 LTM8058 REVISION HISTORY REV DATE A 11/14 B 07/17 DESCRIPTION PAGE NUMBER Lowered Max Solder Temperature to 245C (from 250C) 2 Pin Label Corrected: Was VOUT+ to VOUT1 17 Connected RUN pin to VIN in Typical Application circuit example 16, 17, 20 8058fb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of itsinformation circuits as described herein will not infringe on existing patent rights. For more www.linear.com/LTM8058 19 LTM8058 TYPICAL APPLICATION Total Output Current vs VIN 5V Flyback Converter with Low Noise Bypass 450 VOUT1 * RUN (5.7V) VOUT2 LOW NOISE LDO * 2.2F BYP 22F ADJ2 GND - VOUT VOUT2 5V 0.01F 10F 162k BIAS 4.7F 6.19k SS 400 OUTPUT CURRENT (mA) VIN VIN 5V TO 23V 350 300 250 200 150 ADJ1 LTM8058 8058 TA05a 100 2kV AC ISOLATION 5 10 15 20 30 25 VIN (V) 8058 TA05b DESIGN RESOURCES SUBJECT DESCRIPTION Module Design and Manufacturing Resources Design: * Selector Guides * Demo Boards and Gerber Files * Free Simulation Tools Module Regulator Products Search 1. Sort table of products by parameters and download the result as a spread sheet. Manufacturing: * Quick Start Guide/Demo Manual * PCB Design, Assembly and Manufacturing Guidelines * Package and Board Level Reliability 2. Search using the Quick Power Search parametric table. TechClip Videos Quick videos detailing how to bench test electrical and thermal performance of Module products. Digital Power System Management Linear Technology's family of digital power supply management ICs are highly integrated solutions that offer essential functions, including power supply monitoring, supervision, margining and sequencing, and feature EEPROM for storing user configurations and fault logging. RELATED PARTS Part Number Description Comments LTM8057 LTM8058 without Low Noise Post Regulator 2.5V VOUT 12V, 5% VOUT Accuracy, UL60950 Recognized LTM8046 Higher Output Power Than LTM8058, No Low 2.5W Output Power, 1.8V VOUT 12V, 5% VOUT Accuracy, UL60950 Recognized, 9mm x 15mm x 4.92mm BGA Noise Post Regulator LTM8048 Lower Isolation Voltage Than LTM8058 1.5W Ouput Power, 725V DC Isolation, 1.2V VOUT 12V LTM8047 Lower Isolation Voltage Than LTM8058, No Low Noise Post Regulator 1.5W Ouput Power, 725V DC Isolation, 2.5V VOUT 12V LTM8045 Non-isolated SEPIC (Step-Up & Down) Up to 700mA 2.8V VIN 18V, 2.5V VOUT 15V, Synchronizable, 6.25mm x 11.25mm x 4.92mm BGA LTM4605 Non-isolated Buck-Boost Up to 5A 4.5V VIN 20V, 0.8 VOUT 16V, Synchronizable, 15mm x 15mm x 2.82mm BGA 8058fb 20 LT 0717 REV B * PRINTED IN USA For more information www.linear.com/LTM8058 www.linear.com/LTM8058 (c) LINEAR TECHNOLOGY CORPORATION 2014