AP3405 600mA Step-down DC/DC Converter with Synchronous Rectifier ADVANCED INFORMATION Description Pin Assignments The AP3405 is a 2.0MHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 600mA load with high efficiency, excellent line and load regulation. The high efficiency is easily configured by using an inductor, resistors and capacitors as the external components. Current mode control provides fast transient response and cycle-by-cycle current limit. (Top View) Pin 1 Mark The AP3405 employs complete protection to ensure system security, including input Undervoltage Lockout, Over-Temperature Protection and hiccup mode Short Circuit Protection. This IC is available in U-DFN2020-8 package. 8 EN 7 FB 3 6 VIN 4 5 SW NC 1 NC 2 AGND PGND EP U-DFN2020-8 (Type E) Features Applications High-Efficiency Buck Power Converter Post DC-DC Voltage Regulation Input Voltage Range: 2.3V to 5.5V Mobile Phones and Wearable Devices Output Voltage Range: 0.7V to 5.5V Fixed 2.0MHz Oscillator Frequency Built-in Soft-Start Time Built-in Overcurrent Protection Built-in Thermal Shutdown Function Built-in UVLO Function Hiccup Mode SCP Output Current: 600mA Package: U-DFN2020-8 (Type E) Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. "Green" Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated's definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green" products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. Typical Applications Circuit L 2.2H VIN 6 SW VIN CIN 4.7F AP3405 8 ON/OFF AP3405 Document number: DS38093 Rev. 1 - 2 EN FB AGND PGND VOUT 1.8V 5 7 3 R1 240K R2 120K Cff 22pF COUT 10F 4 1 of 9 www.diodes.com January 2016 (c) Diodes Incorporated AP3405 ADVANCED INFORMATION Pin Descriptions Pin Number Pin Name Function 1,2 NC 3 AGND Signal Ground Pin 4 PGND Power Ground Pin 5 SW Power switch output pin. This pin is connected to the inductor. 6 VIN Supply power input pin. A capacitor should be connected between VIN pin and GND - to keep the input voltage constant. 7 FB Feedback pin. This pin is connected to an external resistor divider to program the system output voltage. 8 EN Control input pin. EN is a digital input that turns the regulator on or off. Drive EN high to turn the regulator on. Drive low to turn the regulator off. No connection Functional Block Diagram EN VIN 6 8 Slope Compensation OCP Comparator Oscillator Current Sensing Shutdown Comparator Bias Generator Buffer & Dead Time Control Logic Control Logic Soft Start FB UVLO 5 SW PWM Comparator 7 Reverse Inductor Current Comparator Error Amplifier Bandgap Reference AP3405 Document number: DS38093 Rev. 1 - 2 4 PGND Vin OVP Comparator 3 2 of 9 www.diodes.com AGND January 2016 (c) Diodes Incorporated AP3405 Absolute Maximum Ratings (@TA = +25C, unless otherwise specified.) (Note 4) ADVANCED INFORMATION Symbol Note: Parameter Rating Unit -0.3 to 6.5 V -0.3 to VIN + 0.3 V VIN VIN Input Voltage VSW SW Pin Voltage VEN EN Pin Input Voltage -0.3 to 6.5 V VFB VFB Pin Voltage -0.3 to 6.5 V ISW SW Pin Output Current 1 A PD Power Dissipation (Standard Land Pattern) 640 mW -55 to +125 C 2,000 V TSTG Storage Temperature Range VHBM ESD (Human Body Model) 4. Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions (@TA = +25C, unless otherwise specified.) Symbol Parameter Min Max Unit VIN Input Voltage 2.3 5.5 V TA Operating Ambient Temperature -40 +85 C AP3405 Document number: DS38093 Rev. 1 - 2 3 of 9 www.diodes.com January 2016 (c) Diodes Incorporated AP3405 Electrical Characteristics (VIN = VEN = 3.6V (VOUT 2.6V), VIN = VEN = VOUT+1V (VOUT > 2.6V), unless otherwise specified. Specification with standard typeface are for TA = +25C, and those in boldface type apply over the full operating temperature range (TA = -40C to +85C)) ADVANCED INFORMATION Symbol VIN Parameter Conditions Input Voltage Min Typ Max 1.0V VOUT 2.3 - 5.5 0.9V VOUT < 1.0V 2.3 - 5.25 0.7V VOUT < 0.9V 2.3 - 4.5 Unit V Supply Current VIN = VEN = VFB = 3.6V - 32 45 A ISTDB Standby Current VIN = 5.5V, VEN = 0V - 0 5 A VUVLO Input UVLO Threshold VIN Rising 2.0 2.1 2.2 V VHYS Input UVLO Hysteresis - - 0.1 - V VENH EN Active Threshold Voltage VIN = 5.5V 1.0 - - V VENL EN Shutdown Threshold Voltage VIN = 2.3V - - 0.4 V VFB Feedback Voltage VIN = VEN = 3.6V 0.591 0.600 0.609 V IFBH FB High Input Current VIN = VFB = 5.5V VEN = 0V -1 0 1 A IFBL FB Low Input Current VEN = VFB = 0V VIN = 5.5V -1 0 1 A RONH High-Side Switch On-Resistance VIN = 3.6V ISW = 100mA - 380 - m RONL Low-Side Switch On-Resistance VIN = 3.6V ISW = 100mA - 300 - m ILIMH SW Current Limit VIN = VEN = 3.6V 800 1,000 - mA fOSC Oscillator Frequency - 1.7 2.0 2.3 MHz DMAX Maximum Duty Cycle - 100 - - % TOTSD Thermal Shutdown - - +140 - C THYS Thermal Shutdown Hysteresis - - +40 - C Soft-Start Time VIN = VEN = 3.6V - 150 300 s IDD tSS AP3405 Document number: DS38093 Rev. 1 - 2 4 of 9 www.diodes.com January 2016 (c) Diodes Incorporated AP3405 Performance Characteristics (TA = +25C, VIN = 3.6V, VOUT = 1.8V, unless otherwise specified.) Efficiency vs. Output Current Output Voltage vs. Output Current 1.815 90 1.810 80 1.805 Output Voltage (V) Efficiency (%) 70 60 50 40 30 VOUT = 1.8V 1.800 1.795 1.790 VIN = 3.6V 1.785 20 1.780 10 0 -50 1.775 0 50 0 100 150 200 250 300 350 400 450 500 550 600 650 100 200 Supply Current vs. Input Voltage 600 0.66 46 0.64 44 Feedback Voltage (V) Supply Current (A) 500 0.68 48 42 40 38 36 34 VOUT = 1.8V, IOUT = 0A 32 0.62 0.60 0.58 0.56 0.54 VIN = 3.6V, Test Mode 0.52 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.50 6.0 -40 -20 0 20 Input Voltage (V) 40 60 80 100 120 140 o Temperature ( C) PMOS RDSON vs. Temperature NMOS RDSON vs. Temperature 440 360 420 340 400 320 NMOS RDSON (m) 380 360 340 320 300 280 300 280 260 240 220 ISW = 100mA ISW = 100mA 200 260 240 -60 400 Feedback Voltage vs. Temperature 50 30 2.0 300 Output Current (mA) Output Current (mA) PMOS RDSON (m) ADVANCED INFORMATION 100 -40 -20 0 20 40 60 80 100 120 140 Document number: DS38093 Rev. 1 - 2 -40 -20 0 20 40 60 80 100 120 140 O O Temperature ( C) Temperature ( C) AP3405 180 -60 5 of 9 www.diodes.com January 2016 (c) Diodes Incorporated AP3405 Performance Characteristics (continued) (TA = +25C, VIN = 3.6V, VOUT = 1.8V, unless otherwise specified.) ADVANCED INFORMATION Output Ripple (IOUT = 0A) Output Ripple (IOUT = 0.6A) VSW 2V/div VSW 5V/div VOUT-AC 20mV/div VOUT-AC 20mV/div IL 500mA/div IL 500mA/div Time 1s/div Time 1.6ms/div Enable Turn on Characteristic (Resistance Load, RLOAD = 3) Enable Turn off Characteristic (Resistance Load, RLOAD = 3) VEN 2V/div VEN 2V/div VOUT 2V/div VOUT 2V/div VSW 1V/div VSW 1V/div Time 50s/div Time 50s/div Short Current Protection (Resistance Load, RLOAD =3) VOUT 1V/div SCP Recovery (Resistance Load, RLOAD = 3) VOUT 1V/div IL 500mA/div IL 500mA/div VSW 2V/div VSW 2V/div Time 200s/div Time 200s/div AP3405 Document number: DS38093 Rev. 1 - 2 6 of 9 www.diodes.com January 2016 (c) Diodes Incorporated AP3405 Application Information Please refer to the Typical Applications Circuit, and to set the circuit parameters please refer to the following descriptions. ADVANCED INFORMATION Undervoltage Lockout (UVLO) Circuit When the VIN drops lower than the UVLO detector threshold, the UVLO circuit starts to operate, V REF stops, and high-side switch and low-side switch built-in switch transistors turn "OFF". As a result, VOUT drops according to the COUT capacitance value and the load. When the VIN is rising higher than UVLO released voltage, the IC will restart the operation. Short Circuit Protection and Recovery When the AP3405 output node is shorted to GND, as VFB drops under 0.3V, the chip will enter hiccup mode to protect itself, when short circuit is removed, and VFB rises over 0.4V, the AP3405 recovers to normal operation again. If the AP3405 reaches OCP threshold while short circuit, the AP3405 will enter cycle-by-cycle current limit mode until the current under OCP threshold. Input Overvoltage Protection When input voltage of AP3405 is near 6.25V, the IC will enter Input-Overvoltage-Protection. It would be shut down and there will be no output voltage in this state. As the input voltage goes down below 6V, it will leave input OVP and recover the output voltage. Over-Temperature Protection The internal thermal temperature protection circuitry is provided to protect the integrated circuit in the event that the maximum junction temperature is exceeded. When the junction temperature exceeds +140C, it shuts down the internal control circuit and switching power MOSFET. The AP3405 will restart automatically under the control of soft start circuit when the junction temperature decreases to +100C. Ordering Information AP3405SHE - 7 Package Packing U-DFN2020-8 7 : Tape & Reel Device Package Code Packaging AP3405SHE-7 SHE U-DFN2020-8 7" Tape and Reel Quantity 3,000/Tape & Reel Part Number Suffix -7 Marking Information U-DFN2020-8 (Type E) ( Top View ) XX YWX AP3405 Document number: DS38093 Rev. 1 - 2 XX : Identification Code Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : Internal Code Part Number Package Identification Code AP3405SHE U-DFN2020-8 2V 7 of 9 www.diodes.com January 2016 (c) Diodes Incorporated AP3405 Package Outline Dimensions (All dimensions in mm.) Please see AP02001 at http://www.diodes.com/_files/datasheets/ap02001.pdf for the latest version. Package Type: U-DFN2020-8 (Type E) ADVANCED INFORMATION (1) A3 A1 A Seating Plane D D2 D2/2 z Pin #1 ID E R0 E2/2 .2 E2 00 R0 0 .12 L e U-DFN2020-8 (Type E) Dim Min Max Typ A 0.50 0.60 0.56 A1 0.00 0.05 0.02 A3 0.203 b 0.20 0.30 0.25 D 1.950 2.075 2.00 D2 1.60 1.80 1.70 e 0.500 BSC E 1.950 2.075 2.00 E2 0.80 1.00 0.90 L 0.25 0.35 0.30 z 0.125 All Dimensions in mm b Suggested Pad Layout Please see AP02001 at http://www.diodes.com/_files/datasheets/ap02001.pdf for the latest version. (1) Package Type: U-DFN2020-8 (Type E) X2 C G Dimensions Y2 Y1 G X1 Y C G X X1 X2 Y Y1 Y2 Value (in mm) 0.500 0.150 0.350 1.800 1.850 0.500 1.000 2.300 X AP3405 Document number: DS38093 Rev. 1 - 2 8 of 9 www.diodes.com January 2016 (c) Diodes Incorporated AP3405 IMPORTANT NOTICE ADVANCED INFORMATION DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright (c) 2016, Diodes Incorporated www.diodes.com AP3405 Document number: DS38093 Rev. 1 - 2 9 of 9 www.diodes.com January 2016 (c) Diodes Incorporated