DEMO MANUAL DC1976A-A LTC3676EUJ Power Management Solution for Application Processors Description Demonstration circuit 1976A-A is a multioutput power supply with a pushbutton controller and I2C, featuring the LTC(R)3676EUJ. The LTC3676EUJ has four synchronous buck regulators, an always-on LDO and three LDO regulators. The input voltage range of the LTC3676EUJ is ideal for single-cell Li-Ion/Polymer battery applications. The three status registers, which can be read via I2C, indicate which regulators are in regulation and if a UV or OT event occurred. The command registers, which are used to control the switching regulators and program the special functions, can also be read back via I2C to assure the correct data was received. The switching regulator settings, such as enables, feedback voltages, operating modes and other functions, can be controlled via I2C. All of the regulators, except the always-on LDO1, can also be enabled via external enable pins. After the first regulator is enabled, the remaining enable pins use a precision threshold to allow hardwired power-up sequences. All the regulators, except LDO1, can also be enabled via the I2C. Refer to the LTC3676EUJ data sheet for more details on the electrical and timing specifications and for an explanation of the different device options. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. The LTC3676EUJ has three status registers, PGSTATL, PGSTATR and IRQSTAT, that can be used to determine the current state of the device. Performance Summary SYMBOL PARAMETER VIN Input Voltage Range Specifications are at TA = 25C CONDITIONS MIN TYP 2.7 MAX UNITS 5.5 V VBUCK1 Buck Regulator 1 Output Voltage Buck 1 Enabled, IBUCK1 = 0 ~ 1.5A 1.82 3.31 3.72 V VBUCK2 Buck Regulator 2 Output Voltage Buck 2 Enabled, IBUCK2 = 0 ~ 1.5A 0.76 1.38 1.58 V VBUCK3 Buck Regulator 3 Output Voltage Buck 3 Enabled, IBUCK3 = 0 ~ 2.5A 0.76 1.38 1.58 V VBUCK4 Buck-Boost Regulator Output Voltage Buck4 Enabled, IBUCK4 = 0 ~ 2.5A 0.82 1.50 1.71 V VLDO1 LDO1 Regulator Output Voltage LDO1 Is Always On, ILDO1 = 0 ~ 25mA 2.92 3.01 3.10 V VLDO2 LDO2 Regulator Output Voltage LDO2 Enabled, ILDO2 = 0 ~ 300mA 2.73 2.81 2.89 V VLDO3 LDO3 Regulator Output Voltage LDO3 Enabled, ILDO3 = 0 ~ 300mA 1.75 1.80 1.85 V VLDO4 LDO4 Regulator Output Voltage LDO4 Enabled, ILDO4 = 0 ~ 300mA 1.16 1.20 1.24 V dc1976aaf 1 DEMO MANUAL DC1976A-A Quick Start Procedure 1. Ensure that JP1 to JP3, SW1 and SW2 are in their default positions, as shown in Figure 1. Set PS1 to 5V and turn on. The RST0 LED should light until LDO1 comes on, and the PGOOD LED should come on and stay on NOTE: The DVCC voltage level may be selected on the DC590B. This is done by setting the VCCIO jumper, JP6, on the DC590B board to one of the following settings: 3.3V, 5V, removed for 2.7V, or set to external if an external supply is used. Please set DVCC to 5V. 2. Start the Linear Technology QuikEvalTM program. This program should automatically detect the presence of the LTC3676EUJ demo board (DC1976A-A) and activate the appropriate GUI, as seen in Figure 3. The GUI reads back the current voltages of the regulators. LDO1 should read 3V, and VIN should read 5V; all others should be 0V. 3. Press the PB1 button on the DC1976A-A for more than 0.5s; all of the power supplies should come up and the displayed GUI page should match Figure 3. 2 The sequencing for these supplies was set by Linear Technology, using resistor divider networks from the supply outputs to control the ENx lines. 4. Each of the supplies can be loaded to test the regulators, but be aware that LDO2~4 are powered from VIN, and the dissipation can be significant. If significant current is desired from these regulators, care with input voltage selection will be required. 5. Press and hold the PB1 button for more than 5s, and all of the regulators, except LDO1, will shut down. The GUI will show the voltages for all regulators, other than always-on LDO1, as 0V. 6. Refer to the Using the LTC3676EUJ Software section for more information on how to control the device using the LTC3676EUJ control window. 7. Refer to the LTC3676EUJ data sheet for more details on how the LTC3676EUJ operates. 8. When done, close the LTC3676EUJ GUI and turn off all loads and power supplies. dc1976aaf DEMO MANUAL DC1976A-A Quick Start Procedure Note: All connections from equipment should be Kelvin connected directly to the board pins to which they are connected on this diagram. Any input or output leads should be twisted-pair. Figure 1. Proper Measurement Equipment Setup GND VIN Figure 2. Measuring Input or Output Ripple dc1976aaf 3 DEMO MANUAL DC1976A-A Using the LTC3676EUJ Software Introduction View the LTC3676EUJ Product Page The LTC3676EUJ GUI provides control of most aspects of operation of the LTC3676EUJ. The LTC3676EUJ GUI also provides a means to manage the feedback divider resistors, turn the regulators on and off manually, and even to experiment with sequencing. This button opens your default Internet browser, and searches the Linear Technology Corporation website for information on the LTC3676EUJ when an Internet connection is available. The LTC3676EUJ GUI is composed of four forms: n n n n The LTC3676 (DC1976A-A) form (Figure 3) is brought up by the QuikEval program. The Manage Resistors form (Figure 4) is brought up by pressing the Change Resistor Divider Networks button on the LTC3676 form. The Advanced Settings form (Figure 5) is brought up by pressing the Advanced Settings button on the LTC3676 form. The Sequencing form is brought up by pressing the Change LTC3676 Sequencing button. The sequencing form, in turn, contains three tabs: Direct (Figure 6), Table (Figure 7) and Shutdown (Figure 8). These allow direct control and table based sequencing, respectively, of power-up and sequencing of shutdown. SW1, positions 1 to 6, sets the source of the ENx signals to the preselected resistor networks or to the on-board microcontroller. SW1 should be set to Resistor Control for normal mode, and C Control for sequence modes (Direct and Table). SW2 controls the source of PWR_ON. Resistor Control, PWR_ON = VLDO3, makes the source the LD03 regulator output. C Control, PWR_ON = C, makes it controlled by the on-board microcontroller. This switch should be set to Resistor Control for normal mode and C Control for sequence modes. 4 Buck1 ~ Buck4 and LDO2~LDO4 Sections These sections control most aspects of the regulator operation. Some of the controls for the regulators are on the Advanced Settings form. Please consult the data sheet for operation of these bits. Whenever the DAC sliders are changed or the regulator is switched between normal and standby, the appropriate control registers are changed. If the text box has a grey background, it cannot be directly edited. A good example of this is the command registers SCR1, OVEN, SCR2, etc., at the bottom of the LTC3676 form. These registers are changed by the various controls on the form. The Auto Readback Enabled button determines if the IRQSTAT, PGSTATL and PGSTATR values are automatically read back. If automatic readback is disabled, the Readback button will do a one-time readback. The Auto Update Enabled button determines if the command registers are automatically sent to the LTC3676 on change, and if the values of these registers are automatically read back. If automatic update is disabled, the Update All button will update all the command registers and read back the values. For all the automatic update modes, an internal 100ms timer is used, so all values will be updated every 100ms, if enabled. dc1976aaf DEMO MANUAL DC1976A-A Using the LTC3676EUJ Software Figure 3. Main Form Figure 4. Manage Resistors Form dc1976aaf 5 DEMO MANUAL DC1976A-A Using the LTC3676EUJ Software Interrupts and Status Load Factory Defaults The current state of IRQSTAT, PGSTATL and PGSTATR are displayed on the right. If an interrupt is pending, the IRQ LED (D1) on the DC1976A-A demo board will light. The interrupt box will change color to red, and indicate Interrupt Pending. To clear the interrupt, press the Clear Interrupt button. The factory default values for the command registers, regulator resistors and auto update states are immediately loaded. Advanced Settings Button This button brings up the Advanced Settings form (Figure 5), which allows the control of several less used bits. Any changes made in this form will immediately be reflected in the appropriate command registers on the LTC3676 form. However, if Auto Update Enabled is disabled, the value will not be sent to the LTC3676EUJ until auto update is re-enabled or Update All is pressed. Mode Display This box displays the current operating mode. The value of this box can be changed in the sequence form. Load Stored Values The state of the command registers, regulator resistors and auto update states can be saved to a file and reused. This button causes the saved states to be loaded immediately. Save Current Values Immediately saves the state of the command registers, regulator resistors and auto update states to file. Start-Up The start-up section determines what the GUI will do at start-up, load default or stored command register, regulator resistors and auto update states. Shutdown The shutdown section determines what the GUI will do at shutdown, store the current command register, regulator resistor resistors and auto update values or not. Figure 5. DC1976A-A (LTC3676EUJ) Advanced Settings Form 6 dc1976aaf DEMO MANUAL DC1976A-A Using the LTC3676EUJ Software Change Resistor Divider Networks Button Neither direct nor sequence mode can be enabled from the other mode. You must be in normal mode to enable direct or sequence mode. This button brings up the Manage Feedback Divider Resistor Values form (Figure 4), which allows for different feedback divider resistor values. Any changes made in this form will immediately be reflected in the appropriate voltage value boxes on the LTC3676 form. It is the user's responsibility to ensure that the values in this form are the same as the values of the actual resistors on the demo board. Returning to normal mode explicitly, by using a button to disable direct or sequence modes, resets the regulator states to the default. However, if you return to normal mode by completing a downloaded sequence, the regulator states are not reset. Change LTC3676 Sequencing Button Direct This brings up the sequencing form which has three tabs, Direct (Figure 6),Table (Figure 7) and Shutdown (Figure 8).These allow the direct control of the regulator on/off (Direct tab), or set up a sequence that will be downloaded to the on-board microcontroller to set the regulator sequencing (Table tab). To directly control the on/off state of the regulators, choose the Direct tab, enable direct mode (the mode display on the LTC3676 form should change to direct). Ensure that the dipswitch positions are in the correct state and check the appropriate boxes. The regulators can now be turned on and off directly. Both the direct and the table modes require that all positions of the SW1 dipswitch be in the C Control position. The Measured Voltage boxes are live and update on the 100ms update timer. Figure 6. Sequence, Direct Form dc1976aaf 7 DEMO MANUAL DC1976A-A Using the LTC3676EUJ Software Table To set up a sequence for the power supplies to power up, choose the Table tab. Do not enable sequence mode until a sequence table has been downloaded. Sequence tables can only be downloaded in normal mode. Some error checking is done on the table before downloading, such as ensuring that at least one regulator is controlled by WAKE, but in general, the user must ensure that the sequence table is reasonable. In particular, always ensure that one regulator is controlled by WAKE and that at least one regulator is used in the particular sequence controls PWR_ON. It is not necessary that you use all regulators, nor that only one regulator is controlled at a time. For example, WAKE could start all regulators, or just one. If PWR_ON is not asserted in the sequence, the sequence will execute, but the regulators will shut down after 5s. Once a sequence has been downloaded, and sequence mode has been set, press the PB1 button to start the sequence. In sequence mode it is not necessary to press the PB1 button for 0.5s. The level of the WAKE signal is the same as the level of the VIN signal, that is, if VIN is 3V, WAKE will assert at 3V. So, when choosing the threshold voltage for WAKE, make sure that you do not set it higher than the VIN voltage. In fact, you should choose a voltage that is VIN/2. Figure 7. Sequence, Table Form 8 dc1976aaf DEMO MANUAL DC1976A-A Using the LTC3676EUJ Software When PWR_ON is asserted in the sequence, the on-board microcontroller determines that the sequence is done and sets the state to normal (without resetting the states of the regulators). The sequence / table form can now be closed. If you wish to rerun the sequence, hold down PB1 for more than 5s, until the regulators shut off. Go to the sequence / table form, and enable sequence mode. It is not necessary to download the sequence table again, as it is still the in the on-board microcontroller's memory. Now, just press the PB1 button to restart the sequence. Shutdown Choose sequencing for shutdown. To activate shutdown sequence, hold MON (PB1) down for more than 10s. Figure 8. Shutdown Sequencing Form dc1976aaf 9 DEMO MANUAL DC1976A-A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP, CHIP, X5R, 10F, 20%, 6.3V, 0603 TDK, C1608X5R0J106M Required Circuit Components 1 5 C1, C11, C14, C17, C21 2 6 C2, C3, C4, C5, C6, C7 CAP, CHIP, X5R, 1F, 10%, 10V, 0402 MURATA, GRM155R61A105KE15D 3 5 C10, C13, C16, C19, C20 CAP, CHIP, X5R, 22F, 20%,6.3V, 0805 TDK, C2012X5R0J226M 4 4 C12, C15, C18, C22 CAP, CHIP, COG, 10pF, 0.5pF, 50V, 0402 VISHAY, VJ0402A4R7 5 4 L1, L2, L3, L4 IND, SMT, 1.5H, 36m, 20%, 5.8A, 4.2mm x 4.2mm COILCRAFT, XFL4020-152ME 6 5 R1, R3, R28, R31, R34 RES, CHIP, 1M, 1%, 1/16W, 0402 VISHAY, CRCW04021M00FKED 7 1 R2 RES, CHIP, 316k, 1%, 1/16W, 0402 VISHAY, CRCW0402316KFKED 8 1 R4 RES, CHIP, 348k, 1%, 1/16W, 0402 VISHAY, CRCW0402348KFKED 9 1 R27 RES, CHIP, 931k, 1%, 1/10W, 0402 VISHAY, CRCW0402931KFKED 10 4 R29, R32, R35, R38 RES, CHIP, 20, 5%, 1/16W, 0402 VISHAY, CRCW040220R0JNED 11 2 R30, R33 RES, CHIP, 1.10M, 1%, 1/16W, 0402 VISHAY, CRCW04021M10FKED 12 2 R43, R60 RES, CHIP, 6.49k, 1%, 1/16W, 0402 VISHAY, CRCW04026K49FKED 13 7 R44, R46, R48, R50, R52, R54, R59 RES, CHIP, 10k, 1%, 1/16W, 0402 VISHAY, CRCW040210K0FKED 14 1 R45 RES, CHIP, 7.15k, 1%, 1/10W, 0402 VISHAY, CRCW04027K15FKED 15 2 R47, R49 RES, CHIP, 2.67k, 1%, 1/16W, 0402 VISHAY, CRCW04022K67FKED 16 2 R51, R53 RES, CHIP, 22.1k, 1%, 1/16W, 0402 VISHAY, CRCW040222K1FKED 17 1 R55 RES, CHIP, 511k, 1%, 1/16W, 0402 VISHAY, CRCW0402511KFKED Additional Demo Board Circuit Components 1 4 C8, C9, C25, C27 CAP, CHIP, X7R, 0.1F, 10%, 16V, 0402 MURATA, GRM155R71C104KA88D 2 2 C26, C28 CAP, CHIP, COG, 1000pF, 5%, 50V, 0402 TDK, GRM1555C1H102J 3 2 C23, C24 CAP, CHIP, X5R, 2.2F, 20%, 6.3V, 0402 MURATA, GRM155R60J225ME15D 4 2 D1, D3 DIODE, LED, RED, SMT, 0603 LITEON, LTST-C193KRKT-5A 5 1 D2 DIODE, LED, ORANGE, RECT, CLEAR, 0603 LITEON,LTST-C193KFKT-5A 6 1 D4 DIODE, SCHOTTKY, SMT, 20V, 0.5A, SOD123 ON SEMICONDUCTOR, MBR0520LG 7 1 D5 DIODE, Si SWITCHING, 100V, 80mA, SOD123 ON SEMICONDUCTOR, MMSD4148G 8 1 M1 MOSFET, 60V, 10, 115A, SOT-23 FAIRCHILD, 2N7002L 9 1 PB1 SWITCH, SMT, N.O. MOMENTARY, 3.5mm x 6mm PANASONIC, EVQPPFA25 10 1 Q1 BITRANS., GP, SS, NPN, 40V, SOT-23 ON SEMICONDUCTOR, MMBT3904LT1G 11 4 R5, R10, R39, R56 RES, CHIP, 1k, 5%, 1/16W, 0402 VISHAY, CRCW04021K00JNED RES, CHIP, 100k, 5%, 1/16W, 0402 VISHAY, CRCW0402100KJNED 12 4 R6, R8, R9, R40 13 11 R11, R12, R13, R14, R15, R16, RES, CHIP, 10k, 5%, 1/16W, 0402 R17, R18, R19, R20, R21 VISHAY, CRCW040210K0JNED 14 3 R22, R23, R25 RES, CHIP, 5.1k, 5%, 1/16W, 0402 VISHAY, CRCW04025K10JNED 15 2 R24, R26 RES, CHIP, 4.7k, 5%, 1/16W, 0402 VISHAY, CRCW04024K70JNED 16 2 R41, R42 RES, CHIP, 100k , 1%, 1/16W, 0402 VISHAY, CRCW0402100KFKED 17 1 SW1 SWITCH, SMT, SPDT, 6 POS. DIP, 37mm x 8mm CTS ELECTROCOMPONENTS, 204-126ST 18 1 SW2 SWITCH, SMT, SPDT, 1 POS. DIP, 7mm x 8mm CTS ELECTROCOMPONENTS, 204-121-LPST 19 1 U2 I2C EEPROM MICROCHIP, 24LC025-I/ST 20 1 U3 PIC MICROCONTROLLER, 6mm x 6mm QFN16 MICROCHIP, PIC16F722-I/ML 21 1 U4 LOW NOISE REGULATED CHARGE PUMP IN 2 x 2 DFN LINEAR TECHNOLOGY, LTC3204BEDC-5 10 dc1976aaf DEMO MANUAL DC1976A-A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Hardware: For Demo Board Only 1 18 E1-E4, E6-E7, E9-E12, E27-E34 TURRET, 0.09" DIA MILL-MAX, 2501-2-00-80-00-00-07-0 2 16 E5, E8, E13-E26 TURRET, 0.061" DIA MILL-MAX, 2308-2-00-80-00-00-07-0 3 1 J1 CONN, HEADER 14POS 2mm VERT GOLD MOLEX, 87831-1420 4 1 J2 HEADER, 2x3, 0.079" DOUBLE ROW SAMTEC, TMM-103-02-L-D 5 2 JP1, JP2 HEADER, 1x4 PIN 0.079" SINGLE ROW SAMTEC, TMM-104-02-L-S 6 1 JP3 HEADER, 1x3 PIN 0.079" SINGLE ROW SAMTEC, TMM-103-02-L-S 9 1 FAB, PRINTED CIRCUIT BOARD DC1976A-4-A/B RES, CHIP, 732k , 1%, 1/16W, 0402 VISHAY, CRCW0402732KFKED DC1976A-A Required Circuit Components 1 1 R7 2 1 R36 RES, CHIP, 280k, 1%, 1/16W, 0402 VISHAY, CRCW0402280KFKED 3 1 R37 RES, CHIP, 1M, 1%, 1/10W, 0402 VISHAY, CRCW04021M00FKED 4 1 R57 RES, CHIP, 1.10M, 1%, 1/10W, 0402 VISHAY, CRCW04021M10FKED 5 0 R58 NO LOAD 6 1 R61 RES, CHIP, 0 JUMPER, 1/16W, 0402 VISHAY, CRCW04020000Z0ED 7 1 U1 PMIC FOR APPLICATION PROCESSORS LINEAR TECHNOLOGY, LTC3676EUJ dc1976aaf 11 A B C D E7 E6 E5 E4 E3 E9 E8 E11 SCL DVDD EN_L3 SDA EN_L2 EN_B4 EN_B3 EN_B1 EN_B2 R12 10k 5% R13 10k 5% E17 E18 R18 10k 5% R20 10k 5% R21 10k 5% E26 E27 R17 10k 5% E23 R19 10k 5% R16 10k 5% E25 R15 10k 5% E21 E22 E24 R14 10k 5% E20 E19 R11 10k 5% 5 VLDO1 E16 E15 E14 E13 WAKE EN_L3 EN_L2 EN_B4 EN_B3 EN_B2 EN_B1 PWR_ON VSTB ON PGOOD WAKE IRQ RST0 PGOOD PWR_ON VLDO3 VLDO4 VBUCK4 EN_L4 EN_L4 / VTTR FB_L4 / VDDQIN GND 1.200V / 1.2V, 2.5V, 2.8V, 3.3V 300mA E12 V (LDO4) E10 GND V(LDO3) 1.8V 300mA VIN_LDO34 1.7V - VIN VLDO2 GND VDD HIGH (LDO2) 2.808V 300mA VIN_LDO2 1.7V - VIN GND VRTC (LDO1) 3.01V 25mA E1 VIN 2.7V - 5.5V 2A E2 GND VIN 1 2 5 R56 1K 5% D3 RED RSTO R9 100k 5% VIN VIN 3 5 7 9 11 13 JP2 EXT + + + + + + + EXT HD2X7 4 6 8 10 12 14 R8 100k 5% + + + + + + + VIO 4 R5 1K 5% R22 5.1K 5% ON OFF JP3 PGOOD LED D1 RED IRQ VIO / VTT (B1) DC590 INTERFACE J1 1 2 R6 100k 5% VIN VIO VIO / VTT (B1) LDO34VIN VIN LDO2VIN JP1 4 1 2 12 7 1 2 3 6 1 4 Vss 256X8 Vcc 5 U2 24LC025I/ST SDA R23 5.1K 5% * PB1 ON D4 1 MBR0520 2 590DVDD R57 R7 * R4 348k R3 1MEG R2 316k R1 1MEG 3 3 R25 5.1K 5% R24 4.7k 5% R58 * C3 1uF 10V 13 14 37 34 18 17 30 10 38 32 33 39 29 19 21 9 8 6 7 4 5 1 3 2 26 28 C9 0.1uF 16V 12 R26 4.7k 5% C7 1uF 10V C6 1uF 10V C5 1uF 10V C4 1uF 10V C2 1uF 10V C1 10uF 0603 6.3V 20% DVDD SDA SCL EN_B1 EN_B2 EN_B3 EN_B4 EN_L2 EN_L3 nRST0 nIRQ WAKE PGOOD nON VSTB PWR_ON 23 C11 10uF 0603 6.3V 20% C14 10uF 0603 6.3V 20% C17 10uF 0603 6.3V 20% C21 10uF 0603 6.3V 20% 2 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 2 1 L1 1.50H 1 XFL4020-152ME 2 XFL4020-152ME L2 1.50H XFL4020-152ME L3 1.50H XFL4020-152ME SCALE = NONE NC GEORGE B. PCB DES. APP ENG. APPROVALS 4 - C10 22uF 6.3V 20% 0805 C13 22uF 6.3V 20% 0805 C16 22uF 6.3V 20% 0805 C19 22uF 6.3V 20% 0805 DATE: N/A SIZE R57 TP1 INJ4 1 LTC3676EUJ / LTC3676EUJ-1 DEMO CIRCUIT 1976A - A / B 6 - 12 - 13 IC NO. DATE VBUCK2 VBUCK3 GND VBUCK4 GND E28 GND E29 V (DDR) (B4) 0.85V - 1.50V - 1.66V 2.5A E30 V (ARM) (B3) 0.78V - 1.38V - 1.53V 2.5A E31 E32 V (SOC) (B2) 0.78V - 1.38V - 1.53V 1.5A E33 V (IO) / VTT (B1) 1.88V - 3.31V - 3.66V 1.5A E34 GND E35 VBUCK1 R61 0 Ohm OPEN R58 OPEN 0 Ohm 6 - 12 - 13 SHEET 1 OF 2 4 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only R27 931k R28 1MEG R29 20 5% R30 1.10MEG R31 1MEG R32 20 5% TP2 INJ3 TP3 INJ2 R33 1.10MEG R34 1MEG R35 20 5% R36 * R37 * R38 20 5% TP4 INJ1 OPEN 1.10MEG GEORGE B. APPROVED PMIC FOR APPLICATION PROCESSORS TECHNOLOGY C22 10pF 0.5pF C12 10pF 0.5pF C15 10pF 0.5pF C18 10pF 0.5pF C20 22uF 6.3V 20% 0805 VIO 1MEG 0 Ohm 280k OPEN R37 PRODUCTION FAB 732k R36 1 DESCRIPTION REVISION HISTORY OPEN R7 REV ECO TITLE: SCHEMATIC -A -B L4 1.50H U1 LTC3676EUJ LTC3676EUJ-1 ASSY * NOTES: UNLESS OTHERWISE SPECIFIED ALL RESISTORS ARE 1%, 0402 ALL CAPACITORS ARE 10%, 50V, 0402 ALL INDUCTORS ARE 20% FB_B4 11 15 22 20 16 25 31 35 24 40 36 CUSTOMER NOTICE 41 GND SW4 PVIN4 FB_B3 SW3 PVIN3 FB_B2 SW2 PVIN2 FB_B1 SW1 PVIN1 U1 LTC3676EUJ / LTC3676EUJ-1 2 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. EN_L4 / VTTR FB_L4 / VDDQIN LDO4 VIN_L4 LDO3 VIN_L3 FB_L2 LDO2 VIN_L2 FB_L1 LDO1 VIN 27 VIN Figure 9. PMIC for Application Processors WP A0 A1 A2 SCLK 8 D2 AMBER PGOOD R10 1K 5% C8 0.1uF 16V 2 VIN A B C D DEMO MANUAL DC1976A-A Schematic Diagram dc1976aaf A B C D VBUCK2 VBUCK3 VBUCK4 VLDO4 VBUCK1 VLDO3 VLDO2 VLDO1 PWR_ON C28 1000pF 5% 590DVDD WAKE R39 1k 5% 1 2 1 5 SPDT 3 4 M1 2N7002L SW2 2 3 6 U4 LTC3204BEDC-5 R40 100k 5% 1 2 2 7 3 5 4 D5 MMSD4148T1G R55 511k 1 SHDN VOUT GND GND C- Vin C+ C27 0.1uF 16V 26 7 6 17 Vdd RA5/AN4/CPS7/SS/Vcap RA4/CPS6/T0CKI RA3/AN3/Vref RA2/AN2 RA1/AN1 RA0/AN0/SS/Vcap RE3/MCLR/Vpp 5 4 16 Vss1Vss2 RC7/RX/DT RC6/TX/CK RC5/SDO RC4/SDI/SDA RC3/SCK/SCL RC2/CCP1 RC1/T1OSI/CCP2 RC0/T10S0/T1CKI RB7/ICSPDAT RA6/OSC2/CLKOUT/Vcap RB6/ICSPCLK RB5/AN13/CPS5/T1G RB4/AN11/CPS4 RB3/AN9/CPS3/CCP2 RB2/AN8/CPS2 RB1/AN10/CPS1 RB0/AN12/CPS0/INT RA7/OSC1/CLKIN U3 C25 0.1uF 16V PIC16F722-I/ML C24 2.2uF 20% 6.3V C23 2.2uF 20% 6.3V 4 15 14 13 12 11 10 9 8 25 24 23 22 21 20 19 18 4 3 2 1 28 27 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 its circuits as described herein will not infringe on existing patent rights. MMBT3904LT1G Q1 R42 100k R41 100k bWAKE 3 C26 1000pF 5% 3 VBUCK4 VBUCK3 VLDO2 1 3 5 2 4 6 ICD INTERFACE J2 R60 6.49k R59 10k 2 1 R43 6.49k R44 10k CUSTOMER NOTICE 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. R45 7.15k R46 10k SCALE = NONE NC GEORGE B. PCB DES. APP ENG. APPROVALS R47 2.67k R48 10k R53 22.1k R54 10k DATE: N/A SIZE 12 11 10 9 8 7 6 5 4 3 23 24 13 14 15 16 17 18 19 20 21 22 R61 * 1 LTC3676EUJ / LTC3676EUJ-1 DEMO CIRCUIT 1976A - A / B 6 - 12 - 13 IC NO. PGOOD SDA SCL EN_L4 EN_L3 EN_L2 EN_B4 EN_B3 EN_B2 SHEET 2 OF 2 4 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only SPDT SW1F SPDT SW1E SPDT SW1D SPDT SW1C SPDT SW1B SPDT SW1A TECHNOLOGY 2 1 EN_B1 DVDD PMIC FOR APPLICATION PROCESSORS TITLE: SCHEMATIC R51 22.1k R52 10k R49 2.67k R50 10k POWER UP SEQUENCE WAKE - > B3 - > LDO2 -> B4 -> LDO3 & LDO4 (DC1976A-A ONLY) -> B2 -> B1 NOTES: UNLESS OTHERWISE SPECIFIED ALL RESISTORS ARE 1%, 0402 ALL CAPACITORS ARE 10%, 50V, 0402 VBUCK4 VBUCK4 VBUCK3 VLDO2 BWAKE VLDO2 Figure 10. PMIC for Application Processors 1 3 2 VIN 5 A B C D DEMO MANUAL DC1976A-A Schematic Diagram dc1976aaf 13 DEMO MANUAL DC1976A-A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user's responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright (c) 2004, Linear Technology Corporation 14 Linear Technology Corporation dc1976aaf LT 0713 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2013