Texas Instruments bq2570 Series User manual

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bq2570x Evaluation Module
User's Guide
SLUUBG6–May 2017
bq2570x Evaluation Module
The bq25700AEVM-732 and bq25703AEVM-732 evaluation modules (EVM) are SMBus or I2C-controlled
NVDC-1 buck boost charger. The input voltage range is between 3.5 V and 24 V, with a programmable
output of 1–4 cells and a charge output current range of 64 mA to 8.128 A. This EVM does not include the
EV2400 interface device; the EV2400 must be ordered separately to evaluate the bq2570x EVM.
Contents
1 Introduction ................................................................................................................... 2
1.1 EVM Features....................................................................................................... 2
1.2 General Description ................................................................................................ 2
2 Test Summary................................................................................................................ 5
2.1 Definitions............................................................................................................ 5
2.2 Equipment ........................................................................................................... 5
2.3 Equipment Setup.................................................................................................... 6
2.4 Procedure............................................................................................................ 8
3 Bill of Materials, Board Layout, and Schematics ........................................................................ 9
3.1 Bill of Materials...................................................................................................... 9
3.2 Board Assembly Layout .......................................................................................... 12
3.3 Schematic .......................................................................................................... 13
List of Figures
1 EV2400 Connections........................................................................................................ 6
2 Original Test Setup for PWR732 (bq2570x EVM) ...................................................................... 7
3 Main Window of the bq2570x Evaluation Software ..................................................................... 7
4 EN_OTG ...................................................................................................................... 8
5 Top Assembly............................................................................................................... 12
6 Bottom Assembly........................................................................................................... 12
7 bq2570x EVM Schematic ................................................................................................. 13
List of Tables
1 I/O Description ............................................................................................................... 3
2 Controls and Key Parameters Setting .................................................................................... 3
3 Recommended Operating Conditions..................................................................................... 4
4 bq2570x EVM Bill of Materials............................................................................................. 9
Trademarks
USB Type-C is a trademark of USB Implementer's Forum, Inc..
All other trademarks are the property of their respective owners.
This datasheet has been downloaded fromhttp://www.digchip.com at this page

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bq2570x Evaluation Module
1 Introduction
1.1 EVM Features
This EVM supports the following features:
• Evaluation module for the bq2570x devices
• Supports 3.5- to 24-V input source
– 3.5- to 24-V, 0- to 6-A input operating range and 1–4 cell battery configuration
– Supports USB2.0, USB 3.0, USB 3.1 (USB Type-C™) and USB_PD
– Supports USB OTG with 4.48- to 20.8-V adjustable output
–Maximum Power Tracking by Input Voltage and Current Regulation
• Narrow VDC (NVDC) power path management
– Instant-on works with no battery or deeply discharged battery (PG1.0 needs charge-enable
command)
– Battery supplements system when adapter is fully-loaded
• 800-kHz or 1.2-MHz switching frequency for low profile inductor
• SMBus (bq25700A) or I2C (bq25703A) port for optimal system performance and status reporting
• Power and Current Monitor for CPU Throttling
• Safety
– Thermal shutdown
– Input and system overvoltage protection
– MOSFET overcurrent protection
• Accelerate charge time by battery path impedance compensation
• Charge status outputs for LED or host processor
• Maximum power tracking capability by input voltage regulation
• Test points for key signals available for testing purposes. Easy probe hook-up.
• Jumpers available. Easy-to-change connections.
1.2 General Description
The bq2570x evaluation modules are complete charger modules for evaluating an SMBUS or I2C-
controlled buck boost charge using the bq2570x devices.
The bq2570x EVM does not include the EV2400 interface board. To evaluate the bq2570x EVM, order an
EV2400 interface board separately.
The bq2570x is a synchronous NVDC-1 battery buck boost charge controller, offering a low component
count, high efficiency solution for space-constrained, multi-chemistry battery charging applications.
The NVDC-1 configuration allows the system to be regulated at the battery voltage, but not drop below the
system minimum voltage. The system keeps operating even when the battery is completely discharged or
removed. When load power exceeds the input source rating, the battery supplement mode prevents the
input source from being overloaded.
The bq2570x charges the battery from a wide range of input sources including a 5-V USB adapter to a
high-voltage USB PD source and traditional adapters.
During power up, the charger sets the converter to buck, boost, or buck-boost configuration based on the
input source and battery conditions. During the charging cycle, the charger automatically transits among
buck, boost, and buck-boost configuration without host control.
The bq2570x monitors adapter current, battery current, and system power. The flexibly programmed
PROCHOT output goes directly to the CPU for throttle back, when needed.
For more details on register functions, see the data sheets – bq25700A (SLUSCQ8) and bq25703A
(SLUSCU1).

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Table 1 lists the I/O descriptions.
Table 1. I/O Description
Jack Description
J1–VIN Input: positive terminal
J1–GND Input: negative terminal (ground terminal)
J2-ILIM_control External converter disable; logic high to pull the ILIM pin down
J2-CHRG_OK CHRG_OK output
J2-ENZ_OTG External OTG disable pin
J2-CELL_control External battery removal control; logic high to pull the CELL pin down
J3–3V3 Onboard 3.3-V output
J3–SDA SMBUS or I2C SDA
J3-SCL SMBUS or I2C SCL
J3-GND Ground
J4-CMPOUT CMPOUT pin output
J4-GND Ground
J4-CMPIN External CMPIN pin input
J5-BAT Connected to battery pack output
J5-GND Ground
J6-SYS Connected to system output
J6-GND Ground
Table 2 displays the controls and key parameters settings.
Table 2. Controls and Key Parameters Setting
Jack Description Factory Setting
JP1
JP7 Inrush control setting: spa1. Bypass inrush control circuit
spa1. JP1 on: bypasses input FETs Q9 and Q10 external selector spa1.
spa1. JP7 top two connection (pin 2 is connected to pin 3): VBUS pin on ACP
spa2. Enable inrush control circuit
spa2. JP1 off: CHRG_OK controls Q9 and Q10 external selector
spa2. JP7 bottom two connection: VBUS pin on VIN
Bypass inrush control circuit:
spaJP1 installed
spaJP7 top two position installed
spa(pin2 is connected pin3)
JP2
JP3
JP4
CELL setting:
spa1S: JP2, JP3, JP4 all open, measure CELL pin voltage 1.2 V
spa2S: JP2 closed, JP3 and JP4 open, measure CELL pin voltage 2.7 V
spa3S: JP3 closed, JP2 and JP4 open, measure CELL pin voltage 3.5 V
spa4S: JP2, JP3 closed, JP4 open, measure CELL pin voltage 4.2 V Bat
sparemoval, short JP4
2S setting: JP2 installed JP3, JP4 all
open
JP5 Jumper on: Pre-bias ILIM_HIZ
Jumper off: Ground ILIM_HIZ Installed
JP6 For input current setting:
spa Jumper on: ILIM_HIZ LOW.
spa Jumper off: Allow pre-bias ILIM_HIZ
Not installed
JP8 Jumper on: On-board LDO to drive the EVM 3V3
Jumper off: disconnect on-board LDO to drive the EVM 3V3 Installed

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Table 3 lists the recommended operating conditions.
Table 3. Recommended Operating Conditions
Symbol Description MIN TYP MAX Unit
Supply voltage, VIN Input voltage from ac adapter input 3.5 5/12/19 24 V
Battery voltage, VBAT Voltage applied at VBAT terminal 0 19.2 V
Supply current, IAC Maximum input current from ac adapter
input 0 3 A
Output current, Iout Output current 0 8 A
Operating junction temperature
range, TJ
0 125 °C

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2 Test Summary
2.1 Definitions
This procedure details how to configure the PWR732 evaluation board. For the test procedure, the
following naming conventions are followed. Refer to the PWR732 schematic for details.
VXXX: External voltage supply name (VADP, VBT, VSBT)
LOADW: External load name (LOADR, LOADI)
V(TPyyy): Voltage at internal test point TPyyy. For example, V(TP12) means the
voltage at TP12.
V(Jxx): Voltage at jack terminal Jxx.
V(TP(XXX)): Voltage at test point “XXX”. For example, V(ACDET) means the voltage at
the test point which is marked as “ACDET”.
V(XXX, YYY): Voltage across point XXX and YYY.
I(JXX(YYY)): Current going out from the YYY terminal of jack XX.
Jxx(BBB): Terminal or pin BBB of jack xx
Jxx ON : Internal jumper Jxx terminals are shorted
Jxx OFF: Internal jumper Jxx terminals are open
Jxx (-YY-) ON: Internal jumper Jxx adjacent terminals marked as “YY” are shorted
Measure: →A,B Check specified parameters A, B. If measured values are not within
specified limits, the unit under test has failed.
Observe →A,B Observe if A, B occurs. If they do not occur, the unit under test has failed.
Assembly drawings have locations for jumpers, test points, and individual components.
2.2 Equipment
The following list of equipment is required for fully testing the EVM:
1. Power Supplies
A power supply capable of supplying 24 V at 6 A is required. While this part can handle larger voltage
and current, it is not necessary for this procedure.
2. Load #1
A 0- to 20-V/0- to 6-A, system DC electronic load and setting as constant voltage load mode.
3. Load #2
A Kepco load: BOP36-6M, DC 0 to ±36 V, 0 to ±6 A (or higher), or equivalent.
4. Meters
Six Fluke 75 multimeters, (equivalent or better) or: Four equivalent voltage meters and two equivalent
current meters.
5. Computer
A computer with at least one USB port and a USB cable.
6. EV2400 Communication Kit
7. Software
Download and properly install bqstudio (Version: 1.3.45 or newer) from http://www.ti.com/tool/bqstudio.

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2.3 Equipment Setup
Use the following guidelines to set up the equipment:
1. Set power supply #1 for 10-V DC, 5-A current limit and then turn off the supply.
2. Connect the output of power supply #1 in series with a current meter to J1 (VIN and GND).
3. Connect a voltage meter across J1 (VIN) and J1 (GND).
4. Connect load #1 in series with a current meter to J6 (VSYS and GND). Connect a voltage meter
across J6 (VSYS and GND). Set 1 A at the constant current mode. Turn off load #1.
5. Connect Load #2 in series with a current meter to J5 (VBAT and GND). Connect a voltage meter
across J5 (VBAT and GND). Set 7 V at KEPCO load output. Turn off Load #2.
NOTE: Add a 47-µF capacitor on the BAT pin when testing without real battery.
6. Connect J3 to the EV2400. Connect J3 to the SMBus PORT 1 (bq25700A) or I2C PORT 2 (bq25703A)
on the EV2400. The connections are shown in Figure 1.
The picture shows the SMBus version EVM connection. If using the bq25703AEVM-732, move the connector to the
I2C port.
Figure 1. EV2400 Connections

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7. Install jumpers as “JUMPER SET UP”.
After completing these steps , the test setup for PWR732 is as shown in Figure 2.
Figure 2. Original Test Setup for PWR732 (bq2570x EVM)
8. Turn on the computer and power supply #1. Open the bqstudio software.
(a) Select Charger and click the Next button.
(b) For SMBus bq25700A, select “Charger_1_00-bq25700ASMB.bqz” on the Select a Target Page. For
I2C bq25703A, select “Charger_1_00-bq25703AI2C.bqz” on the Select a Target Page.
(c) After selecting the target device, change “update mode” from “immediate” to “manual”, click “Read
Register” and the following interface is presented.
Figure 3. Main Window of the bq2570x Evaluation Software

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2.4 Procedure
2.4.1 Charge Function
1. Make sure Equipment Setup steps are followed.
2. Set Tgt Address to 12(9) for bq25700A or D6(6B) for bq25703A
3. Write “020E” to charge option 0 register 0x12H (bq25700A) or 0x00H (bq25703A).
Measure →V(J1(VIN)) = 10 V ±0.5 V
Measure →V(TP28(CHRG_OK)) = 3 V to 4.5 V
Measure →V(TP21(REGN)) = 6 V ±1 V
Measure →V(TP22(ILIM_HIZ)) = 2.2 V
4. Write “0800” to charge current 0x14H (bq25700A) or 0x02H (bq25703A). Turn on load #1.
Measure →V(J6(SYS)) = 8.4 V ±0.5 V
5. Turn on LOAD #2 (VBAT Load).
Measure →V(J5(VBAT)) = 7 V ±0.5 V
Measure →I(J5(VBAT)) = 2 A ±0.5 V
2.4.2 OTG Function
Use the following for OTG function settings:
1. Set EN_OTG high on J2 (EN_OTG) or short TP37 to TP35 (EN_OTG).
2. Connect a 7-V power supply to the VBAT load. Remove the VIN power supply from J1. (Connection
must be physically removed from board).
3. Write the Charge Voltage Register to 0x20D0.
4. Write “0200” to the OTG voltage register. Write “4000” to the OTG current registers.
5. Select EN_OTG in Charge Option 3.
Measure →V(J1(VIN))=5V±1V
Figure 4. EN_OTG

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3 Bill of Materials, Board Layout, and Schematics
This section contains the EVM BOM, board layout images, and schematics.
3.1 Bill of Materials
Table 4 lists the bq2570x EVM bill of materials.
Table 4. bq2570x EVM Bill of Materials
Designator Qty Value Description Package
Reference Part Number Manufacturer Alternate Part Number Alternate Manufacturer
!PCB1 1 Printed Circuit Board PWR732 Any - -
C3, C4, C5, C6, C7, C8,
C9, C10, C23, C24, C44,
C45
12 10uF CAP, CERM, 10 µF, 25 V, +/- 10%, X5R, 0805 0805 GRM21BR61E106KA73L Murata
C12 1 0.01uF CAP, CERM, 0.01 µF, 25 V, +/- 10%, X7R, 0603 0603 GRM188R71E103KA01D Murata
C15, C16 2 0.047uF CAP, CERM, 0.047uF, 25V, +/-10%, X7R, 0603 0603 GRM188R71E473KA01D Murata
C17 1 1000pF CAP, CERM, 1000 pF, 25 V, +/- 5%, X7R, 0402 0402 C0402C102J3RACTU Kemet
C18, C29 2 1uF CAP, CERM, 1uF, 25V, +/-10%, X7R, 0603 0603 GRM188R71E105KA12D Murata
C19, C20 2 150pF CAP, CERM, 150 pF, 50 V, +/- 5%, C0G/NP0, 0603 0603 C0603C151J5GACTU Kemet
C22, C27, C38, C39 4 0.1uF CAP, CERM, 0.1uF, 25V, +/-10%, X7R, 0603 0603 GRM188R71E104KA01D Murata
C25 1 0.47uF CAP, CERM, 0.47 µF, 16 V, +/- 10%, X7R, 0805 0805 C0805C474K4RACTU Kemet
C26 1 10uF CAP, CERM, 10 µF, 25 V, +/- 10%, X7R, 1206 1206 GRM31CR71E106KA12L Murata
C28 1 1uF CAP, CERM, 1 µF, 25 V, +/- 10%, X7R, 0603 0603 GRM188R71E105KA12D Murata
C30 1 2.2uF CAP, CERM, 2.2 µF, 35 V, +/- 10%, X5R, 0603 0603 GRM188R6YA225KA12D Murata
C31 1 33pF CAP, CERM, 33 pF, 50 V, +/- 5%, C0G/NP0, 0402 0402 GRM1555C1H330JA01D Murata
C32 1 680pF CAP, CERM, 680 pF, 50 V, +/- 5%, C0G/NP0, 0402 0402 GRM1555C1H681JA01D Murata
C33 1 1800pF CAP, CERM, 1800 pF, 50 V, +/- 10%, X7R, 0402 0402 GRM155R71H182KA01D Murata
C34 1 15pF CAP, CERM, 15 pF, 50 V, +/- 5%, C0G/NP0, 0402 0402 GRM1555C1H150JA01D Murata
C35, C36, C37 3 100pF CAP, CERM, 100pF, 50V, +/-5%, C0G/NP0, 0603 0603 C0603C101J5GAC Kemet
C46, C47 2 0.033uF CAP, CERM, 0.033 µF, 25 V, +/- 10%, X7R, 0603 0603 GRM188R71E333KA01D Murata
C48 1 47uF CAP, Tantalum Polymer, 47 µF, 20 V, +/- 20%, 0.055 ohm,
7343-20 SMD 7343-20 20TQC47MYF Panasonic
D2, D3, D5 3 30V Diode, Schottky, 30V, 0.2A, SOD-323 SOD-323 BAT54HT1G ON Semiconductor
D4 1 Green LED, Green, SMD 1.6x0.8x0.8mm LTST-C190GKT Lite-On
H1, H2, H3, H4 4 Bumpon, Hemisphere, 0.44 X 0.20, Clear Transparent
Bumpon SJ-5303 (CLEAR) 3M
J1, J5, J6 3 TERMINAL BLOCK 5.08MM VERT 2POS TERM_BLK,
2pos, 5.08mm ED120/2DS On-Shore Technology, Inc.
J2 1 Terminal Block, 6A, 3.5mm Pitch, 4-Pos, TH 14x8.2x6.5mm ED555/4DS On-Shore
Technology
J3 1 Header, 100mil, 4x1, R/A, TH 4x1 R/A Header 22-05-3041 Molex
J4 1 Terminal Block, 6A, 3.5mm Pitch, 3-Pos, TH 10.5x8.2x6.5mm ED555/3DS On-Shore
Technology, Inc.
JP1, JP2, JP3, JP4, JP5,
JP6, JP8 7 Header, 100mil, 2x1, Gold plated, TH Header, 2x1, 100mil 5-146261-1 TE Connectivity

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Table 4. bq2570x EVM Bill of Materials (continued)
Designator Qty Value Description Package
Reference Part Number Manufacturer Alternate Part Number Alternate Manufacturer
JP7 1 Header, 100mil, 3x1, Tin, TH Header, 3 PIN,
100mil, Tin PEC03SAAN Sullins Connector Solutions
L1 1 2.2uH Inductor, Wirewound, Powdered Iron, 2.2 µH, 8.5 A, 0.0203
ohm, SMD 9.2x8.5mm 74437356022 Wurth Elektronik IHLP3232CZER2R2M01 Vishay-Dale
LBL1 1 Thermal Transfer Printable Labels, 0.650" W x 0.200" H -
10,000 per roll PCB Label 0.650"H x
0.200"W
THT-14-423-10 Brady - -
Q1, Q2, Q3, Q4 4 30V MOSFET, N-CH, 30 V, 12 A, SON 3.3x3.3mm SON 3.3x3.3mm CSD17551Q3A Texas Instruments None
Q5, Q6 2 -30V MOSFET, P-CH, -30 V, -8.5 A, 8-PowerVDFN 8-PowerVDFN DMP3035SFG-7 Diodes Inc. DMG7401SFG-7 Diodes, Inc.
Q7 1 -20V MOSFET, P-CH, -20 V, -15 A, SON 3.3x3.3mm SON 3.3x3.3mm CSD25402Q3A Texas Instruments None
Q9 1 50 V Transistor, NPN/PNP Pair, 50 V, 0.05 A, SC-74R SC-74R DCX124EK-7-F Diodes Inc.
Q10, Q12 2 60V MOSFET, N-CH, 60V, 0.26A, SOT-23 SOT-23 2N7002ET1G ON Semiconductor None
Q11 1 60V MOSFET, N-CH, 60 V, 0.26 A, SOT-23 SOT-23 2N7002ET1G ON Semiconductor None
R2, R8 2 0.01 RES, 0.01 ohm, 1%, 1W, 1206 1206 WSLP1206R0100FEA Vishay-Dale
R3, R4 2 3.9 RES, 3.9 ohm, 5%, 0.25W, 1206 1206 CRCW12063R90JNEA Vishay-Dale
R9, R28 2 100k RES, 100 k, 1%, 0.1 W, 0603 0603 RC0603FR-07100KL Yageo America
R10, R38 2 10.0 RES, 10.0 ohm, 1%, 0.25W, 1206 1206 ERJ-8ENF10R0V Panasonic
R11, R12 2 4.99 RES, 4.99, 1%, 0.1 W, 0603 0603 CRCW06034R99FKEA Vishay-Dale
R13 1 1.0 RES, 1.0, 5%, 0.125 W, 0805 0805 CRCW08051R00JNEA Vishay-Dale
R14 1 20k RES, 20 k, 5%, 0.1 W, 0603 0603 CRCW060320K0JNEA Vishay-Dale
R15, R16 2 10 RES, 10, 5%, 0.1 W, 0603 0603 CRCW060310R0JNEA Vishay-Dale
R17 1 10k RES, 10 k, 5%, 0.1 W, 0603 0603 CRCW060310K0JNEA Vishay-Dale
R18 1 10.0 RES, 10.0 ohm, 1%, 0.1W, 0603 0603 CRCW060310R0FKEA Vishay-Dale
R19, R26 2 383k RES, 383 k, 1%, 0.1 W, 0603 0603 CRCW0603383KFKEA Vishay-Dale
R20 1 120k RES, 120 k, 1%, 0.1 W, 0603 0603 RC0603FR-07120KL Yageo America
R21 1 64.9k RES, 64.9 k, 1%, 0.1 W, 0603 0603 RC0603FR-0764K9L Yageo America
R22 1 40.2k RES, 40.2 k, 1%, 0.063 W, 0402 0402 CRCW040240K2FKED Vishay-Dale
R23 1 10.0k RES, 10.0 k, 1%, 0.063 W, 0402 0402 CRCW040210K0FKED Vishay-Dale
R24 1 280k RES, 280 k, 1%, 0.1 W, 0603 0603 CRCW0603280KFKEA Vishay-Dale
R25 1 10.0k RES, 10.0 k, 1%, 0.1 W, 0603 0603 CRCW060310K0FKEA Vishay-Dale
R27 1 220k RES, 220 k, 1%, 0.1 W, 0603 0603 RC0603FR-07220KL Yageo America
R29, R42 2 300k RES, 300 k, 1%, 0.1 W, 0603 0603 CRCW0603300KFKEA Vishay-Dale
R30 1 137k RES, 137 k, 1%, 0.1 W, 0603 0603 RC0603FR-07137KL Yageo America
R31 1 100 RES, 100, 1%, 0.1 W, 0603 0603 CRCW0603100RFKEA Vishay-Dale
R32, R33, R35, R39 4 10.0k RES, 10.0k ohm, 1%, 0.1W, 0603 0603 CRCW060310K0FKEA Vishay-Dale
R34 1 30.1k RES, 30.1k ohm, 1%, 0.1W, 0603 0603 CRCW060330K1FKEA Vishay-Dale
R36 1 2.00k RES, 2.00k ohm, 1%, 0.1W, 0603 0603 CRCW06032K00FKEA Vishay-Dale
R41 1 2.0Meg RES, 2.0 M, 5%, 0.1 W, 0603 0603 CRCW06032M00JNEA Vishay-Dale
SH-JP1, SH-JP2, SH-
JP3, SH-JP4, SH-JP5,
SH-JP6, SH-JP7, SH-JP8
8 1x2 Shunt, 100mil, Gold plated, Black Shunt 969102-0000-DA 3M SNT-100-BK-G Samtec