Texas Instruments TPS65020EVM-110 User manual

1 Introduction
1.1 Requirements
1.2 Personal Computer (PC)
User's GuideSLVU138 – August 2005
TPS65020EVM-110 User's Guide
This User’s Guide describes the characteristics, operation, and use of theTPS65020EVM-110 evaluation module (EVM). This EVM is designed to help the userevaluate and test the various operating modes of the TPS65020. This User’s Guideincludes setup instructions for the hardware and software, a schematic diagram, a billof materials (BOM), and PCB layout drawings for the evaluation module.
Contents1 Introduction .......................................................................................... 12 Setup ................................................................................................. 23 Board Layout ........................................................................................ 34 Schematic and Bill of Materials ................................................................... 85 Related Documentation .......................................................................... 10
List of Figures
1 Assembly Layer ..................................................................................... 42 Top Layer ............................................................................................ 53 Routing, GND Plane................................................................................ 64 Routing, VIN Plane ................................................................................. 75 Routing, Bottom Layer ............................................................................. 86 TPS65020EVM-110 Schematic ................................................................... 9
List of Tables
1 HPA110A BOM .................................................................................... 10
The Texas Instruments TPS65020EVM is an integrated Power Management IC for applications that arepowered with one Li-Ion or Li-Polymer cell, and require multiple power rails. The TPS65020 contains threehighly efficient switching step-down converters, two LDOs, and additional status and I/O pins. The deviceis controlled via an I
2
C™ interface.
In order for this EVM to operate properly, the following components must be connected, and properlyconfigured.
A computer with a USB port is required to operate this EVM. The TPS65020 interface software, which isrun on the PC, communicates with the EVM via the PC USB port. The user sends commands to the EVMas well as reads the contents of the TPS65020 internal registers through the USB port.
I
2
C is a trademark of Philips Electronics.
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1.3 Printed Circuit Board Assembly
1.4 USB to I
2
C Interface Board (EV2300)
1.5 Software
2 Setup
2.1 Input / Output Connector Descriptions
Setup
The TPS65020EVM-110 PCB contains the TPS65020 IC and its required external components. Thisboard contains several jumpers and connectors that allow the user to customize the board for specificoperating conditions.
The EV2300 is the link that allows the PC and the EVM to communicate. One end of the EV2300connects to the PC with the supplied USB cable, and the other end of the EV2300 connects to the EVMwith the supplied Molex cable. When the user writes a command to the EVM, the interface program, whichis run from the PC, sends the command to the PC USB port. The EV2300 receives the USB commandand converts the signal to an I
2
C protocol. It then sends the I
2
C signal to the TPS65020 board. When theuser reads a status register from the EVM, the PC sends a command to read a register on the EVM.When the EVM receives the command, it reports the status of the register via the I
2
C interface. TheEV2300 receives the information on the I
2
C interface, converts it to a USB protocol, and sends it to thePC.
Texas Instruments has provided software to assist the user in evaluating this EVM. To install the software,insert the enclosed CD into your computer. The software should start automatically. If it does not, simplygo to <Start>, <Run>, and type “D:\SLVU138.exe”, and click <OK> (assuming that D: is your CD drive).The program should run without errors. If any problems occur that result in the program not beinginstalled, view the readme.txt file on the CD for further information. Check the TPS65020 product folder onthe TI website for the latest revision of the software.
This section describes the jumpers and connectors on the EVM as well as how to properly connect, setup,and use the TPS65020EVM-110.
INPUT / OUTPUT DESCRIPTION
Input voltage from external power supply, recommended maximum 5.5 V. Input current is dependentJ1 – VIN
on load but is typically below 2 A.J2 – GND This is the return connection for V
I
.Input voltage and return for LDO1 and LDO2C. Resistor R23 connects this pin to VDCDC1. If anJ3 – VINLDO/GND
external power supply is used, remove R23. Recommended maximum input voltage is 5.5 VInput voltage and return for VSYSIN, one of the input voltages for RTC. Resistor R24 connects thisJ4 – VSYSIN/GND input to VDCDC1. If an external power supply is used, remove R24. Recommended maximum inputvoltage is 4 VInput voltage and return for VBACKUP, one of the input voltages for RTC. There is no on boardJ5 – VBACKUP/GND
connections to a voltage input. Recommended maximum input voltage is 4 V.Direct connection to the GPIO1 and GPIO2 pins. For this EVM, GPIO1 is configured as aJ6 – GPIO1/GPIO2
push-button input, and GPIO2 is configured as an LED output.J7 – VRTC/GND Output voltage from the RTC circuit.Four fault outputs are available on this connector:PWRFAIL - Fault occurs when input voltage is below 3 V. Pulled up to VRTC when safe, low for fail.INT - Fault occurs when there is a fail on an input or output voltage. It acts as a sum fail. Pulled upJ8 – Fault Outputs
to V
I
when safe, low for fail.RESPWRON– Low reset signal controlled by SW2, 300 mS. Pulled up to V
I
normally.LOWBAT– Fault occurs when input voltage is below 3.6 V. Pulled up to V
I
when safe, low for fail.J9 – USB This header duplicates the signals from the J20 interface connector.Output from DCDC1 switching regulator, maximum output current is 1.2 A, default voltage setting isJ10 – VDCDC1
3.3 V.
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2.2 Setup
3 Board Layout
Board Layout
INPUT / OUTPUT DESCRIPTION
J11 – GND Return for VDCDC1J12 – VDCDC2 Output from DCDC2 switching regulator, maximum output current 1 A, default voltage setting 2.5 V.J13 – GND Return for VDCDC2J14 – VLDO1 Output from the low drop out regulator VLDO1, maximun current out is 50 mA, default value 1.1 V.J15 – GND Return for VLDO1J16 –VLDO2 Output from the low drop out regulator, VLDO2 maximum current out is 50 mA, default value 1.3 V.J17 – GND Return for VLDO2J18 – VDCDC3 Output from the switching regulator DCDC3, maximum current is 800 mA, default value 1.55 AJ19 – GND Return for VDCDC3J20 – USB USB interface connectorJP1 – DEF 1 Sets voltage for DCDC1 to 3 V or 3.3 V.JP2 – DEF 2 Sets voltage for DCDC2 to 2.5 V or 1.8 V.JP3 – DEF 3 Sets voltage for DCDC3 to 1.55 V or 1.3 V.JP4 – DCDC1 ON/OFF EN for regulator DCDC1, default setting is ON.JP5 – DCDC2 ON/OFF EN for regulator DCDC2, default setting is ON.JP6 – DCDC3 ON/OFF EN for regulator DCDC3, default setting is ON.JP7 – LDO ON/OFF EN for both LDO1 and LDO2 regulators, default setting is ON.S1 is a normally open momentary push-button switch that, when pressed, connects V
I
to GPIO1.S1 – GPIO1 The GPIO1 input is configured on the TPS65020 as a debounced push button that drives anON/OFF circuit with output at GPIO2.S2 is a normally open momentary push-button switch that, when pressed, connects the HOT_RSTS2 – HOT_RST input of the TPS65020 to GND generating the Hot_Reset pulse. The HOT_RST pin is externallypulled up.
The following steps must be followed before the EVM is operated1. Install the TPS65020EVM Software.2. Connect input voltages and loads to the EVM.3. Configure all EVM jumpers to factory setting.– JP4—ON
– JP1—3.3 V– JP3—1.55 V– JP2—2.5 V– JP5—ON
– JP6—ON
– JP7—ON
4. Connect the Molex cable between the EVM and the EV2300. Note that the Molex cable must connectto the I
2
C connector on the EV2300.5. Connect the USB cable between the computer and the EVM.6. Turn on all supplies and loads.7. Run the TPS65020EVM software.
This section provides the TPS65020EVM-110 board layout and illustrations.
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3.1 Layout
Board Layout
Board layout is critical for all switch mode power supplies. Figure 1 through Figure 5 show the boardlayout for the TPS65020EVM-110 PWB. The nodes with high switching frequencies and currents are shortand are isolated from the noise sensitive feedback circuitry. Careful attention has been given to the routingof high frequency current loops. See to the datasheet for specific layout guidelines.
Figure 1. Assembly Layer
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Board Layout
Figure 2. Top Layer
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Board Layout
Figure 3. Routing, GND Plane
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Board Layout
Figure 4. Routing, VIN Plane
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4 Schematic and Bill of Materials
Schematic and Bill of Materials
Figure 5. Routing, Bottom Layer
This section provides the TPS65020EVM-110 schematic and bill of materials.
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4.1 Schematic
Schematic and Bill of Materials
Figure 6. TPS65020EVM-110 Schematic
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4.2 Bill of Material
5 Related Documentation
Related Documentation
Table 1. HPA110A BOMCount Ref Des Value Description Size Part No. MFR
–001 –002
C1, C2,C4, C9,9 9 C10, C11, 10 µF Capacitor, ceramic, 10 µF, 6.3 V, X5R, 20% 0805 C2012X5R0J106K TDKC14, C15,C16
C8, C12,4 4 2.2 µF Capacitor, ceramic, 2.2 µF, 6.3 V, X5R, 10% 0603 C1608X5R0J225K TDKC13, C18
C3, C6,4 4 1.0 µF Capacitor, Ceramic, 1.0 µF, 6.3 V, X5R,10% 0603 C1608X5R0J105K TDKC7, C17
1 1 C5 1500 pF Capacitor, Ceramic, 1500 pF, 50 V, X7R, 10% 0603 C1608X7R1H152K TDK
Diode, LED, Red, Gullwing, GW Type, 20 ma,1 1 D1 Red 0.087 x 0.120 LN1261CAL Panasonic1.4 mcd typ
Diode, LED, Red, Gullwing, GW Type, 20 ma,0 0 D2 Open 0.087 x 0.1201.4 mcd typ.
J1 - J7,17 17 Header, 2-pin, 100 mil spacing, (36-pin strip) 0.100 x 2 PTC36SAAN SullinsJ10 - J19
Header, Friction Lock Assembly, 4-pin Right1 1 J20 0.400 x 0.500 22-05-3041 MolexAngle
2 2 J8, J9 Header, 4-pin, 100 mil spacing, (36-pin strip) 0.100 x 4 PTC36SAAN Sullins
7 7 JP1 - JP7 Header, 3-pin, 100 mil spacing, (36-pin strip) 0.100 x 3 PTC36SAAN Sullins
0 2 JP8, JP9 Header, 2-pin, 100 mil spacing, (36-pin strip) 0.100 x 2 PTC36SAAN Sullins
Inductor, SMT, 1.72-A, 59-milliohm VLCF4020T-2 2 L1, L2 2.2 µH 0.157 x 0.157 TDK2R2N1R7
VLF4012AT-1 1 L3 2.2 µH Inductor, SMT, 1.5-A, 87-milliohm 0.137 X 0.147
2R2M1R5 TDK
R1 - R7,0 0 Open Resistor, Chip, xx-Ohms, 1/16-W, 1% 0603R20, R21
1 1 R11 10 Resistor, Chip, 10-Ohms, 1/16-W, 1% 0603 Std Std
1 1 R12 1.20M Resistor, Chip, 1.20M-Ohms, 1/16-W, 1% 0603 Std Std
1 1 R13 499k Resistor, Chip, 499k-Ohms, 1/16-W, 1% 0603 Std Std
2 2 R18, R19 4.75k Resistor, Chip, 4.75k-Ohms, 1/16-W, 1% 0603 Std Std
R22, R23,3 3 0 Resistor, Chip, 0-Ohms, 1/16-W, 1% 0603 Std StdR24
1 1 R8 1.0k Resistor, Chip, 1.0k-Ohms, 1/16-W, 1% 0603 Std Std
R9, R10,6 6 R14, R15, 100k Resistor, Chip, 100k-Ohms, 1/16-W, 1% 0603 Std StdR16, R17
R25, R26,0 3 100k Resistor, Chip, 100k-Ohms, 1/16-W, 1% 0603 Std StdR27
2 2 SW1, SW2 Switch, SPST, PB Momentary, Sealed Washable 0.245 X 0.251 KT11P2JM C & K
IC, Power Management IC for Li-Ion Powered1 0 U1 0.242 x 0.242 TPS65020RHA TISystems
IC, Power Management IC for Li-Ion Powered1 0.242 x 0.242 TPS65021RHA TISystems
1 1 PCB, 3.65 In x 2.95 In x 0.062 In HPA110 Any
7 9 Shunt, 100-mil, Black 0.100 929950-00 3M
1. TPS65020, Power Management IC for Li-Ion Powered Systems data sheet, SLVS607
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