Texas Instruments BQ25185EVM User manual
EVM User's Guide: BQ25185EVM
BQ25185 Evaluation Module
Description
The BQ25185 evaluation model (EVM) is designed
to evaluate and test various operating modes
of the BQ25185. The EVM is designed for a
complete test friendly evaluation with visual indicators.
The BQ25185 is an integrated battery charge
management IC that integrates most common
functions for solar based industrial devices with
rechargeable batteries: linear charging, regulated
output, Factory mode, and battery tracking VINDPM.
Features
• 1-A linear battery charger
• Resistor configurable battery regulation voltage
with 0.5% accuracy
• Thermal charging profile with configurable Hot,
and Cold thresholds
• Power Path management for powering the system
and charging the battery
• 4-uA Factory mode for maximizing battery shelf life
• Resistor programmable pins VSET/ILIM and ISET
• Status Pins, STAT1 and STAT2 to show device
status
• Test points for easy probing
• On-board resistances for minimal test setup
Figure 1-1. BQ25185EVM Hardware Board
Caution
Caution hot surface
Contact can cause burns
Do not touch!
Some components may reach high temperatures >55°C when the board
is powered on. The user must not touch the board at any point during
operation or immediately after operating, as high temperatures may be
present.
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BQ25185 Evaluation Module 1
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1 Evaluation Model Overview
1.1 Introduction
The BQ25185EVM is an evaluation kit for the BQ25185 battery charge management IC. The BQ25185 is
a resistor controlled, wide-input operating range 1-A linear battery charger with Power Path in a small QFN
package with a thermal pad. The BQ25185 integrates the most common functions for industrial and personal
electronics applications and provides ultra-low IQ, integrated protections, resistor configurability, TS monitoring,
and best thermal performance in a small solution size.
The BQ25185EVM can be evaluated using a micro-USB input and a battery with a 2-pin JST connector. The
EVM contains pin headers are provided to connect with power supplies to simulate charging operation. With
on-board potentiometers, jumpers, switches, and terminal blocks, different battery charger parameters can be
configured. For specific parameters, review the datasheet for how to configure the device.
1.2 Kit Contents
This EVM kit includes:
• 1 x BQ25185EVM
1.3 Specifications
The BQ25185 EVM has the following features:
• 1 cell battery charging with power path management
• Up to 1A charging
• Input voltage operating range from 3.6 V to 18 V
1.4 Device Information
This user's guide provides detailed testing instructions for the BQ25185 evaluation module (EVM). Also included
are descriptions of the necessary equipment, equipment setup, procedures, the printed-circuit board layouts,
schematics, and the bill of materials (BOM).
Throughout this user's guide, the abbreviation EVM, BQ25185EVM, and the term evaluation module are
synonymous with the BQ25185 evaluation module, unless otherwise noted.
2 Hardware
2.1 EVM Setup
Table 2-1 lists the jumper connections and the jumper description.
Table 2-1. Jumper Descriptions
Jumper
Name Description Factory Setting
J1 VIN and GND connector. Input voltage from external power
supply. Recommended voltage is 5 V and OVP is 18.5 V.
Max input voltage is 25 V while in OVP.
Not installed
J2 VBAT and GND connector. Battery connection using jumper
for easy access.
Not installed
J3 VSYS and GND connector. Not installed
J4 /CE connector. Connects /CE pin to higer if populated. Leave
floating for low.
Installed
J5 Battery pack connector. Battery connection using JST
header.
N/A
J6 Micro-USB connector (optional for VIN) N/A
J7 TS potentiometer connector. Connects TS potentiometer to
TS pin. Leaving this jumper will leave the TS pin open.
Installed
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Table 2-1. Jumper Descriptions (continued)
Jumper
Name Description Factory Setting
J8 SYS to LDO connection. Populating this jumper will power
the LDO by the BQ25185 SYS pin
Not installed
J9 STAT1 and STAT2 pull-up connection. Populating this jumper
will pull STAT1 and STAT2 to an on-board 3V3 LDO.
Installed
J12 Connects the ISET pin. Connect to FXD setting for a 750 Ω
connection. Connect to ADJ to connect the ISET pin to the
ISET potentiometer R14
FXD
Figure 2-1 shows the various connections and features on the device.
VIN
VBAT
TS/MR Push Bu
on ILIM Resistance selector
ISET
poten
ometer
TS poten
ometer
Figure 2-1. EVM Connections
Table 2-2 lists the recommended operating conditions.
Table 2-2. Recommended Operating Conditions
MIN NOM MAX UNIT
VBAT Battery voltage range 2.2 4.6 V
VIN Input voltage range 3.3 18 V
IIN Input current range (IN to SYS) 1.1 A
IBAT Battery discharge current (BAT to SYS) 3.125 A
TAOperating ambient temperature range -40 85 °C
TJOperating junction temperature range -40 125 °C
2.2 EVM Connectors and Test Points
Table 2-3 describes the test points available on the board for easy access measurement.
Table 2-3. Test Point Descriptions
Test Point Description
TP1, TP2, TP3, TP14, TP16, TP18 IC GND test point
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Table 2-3. Test Point Descriptions (continued)
Test Point Description
TP4, TP15 IC VIN test point
TP5, TP17 IC VSYS test point
TP6 IC STAT1 test point
TP7, TP13 IC VBAT test point
TP8 IC ISET test point
TP9 IC STAT2 test point
TP10 IC VSET/ILIM test point
TP11 IC TS/MR test point
TP12 IC /CE test point
3 Testing Procedures
3.1 Equipment
This section includes a list of supplies recommended to perform tests on this EVM.
1. Two Power Supplies: Keithley 2400 Power Supply or equivalent
a. Power Supply #1 (PS #1) will be used as input voltage
b. Power Supply #2 (PS #2) will be used as battery voltage
2. Four Channel Oscilloscope: To monitor voltages at VIN, VBAT, and VSYS at least
a. Channel 1 (SC #1) will be used to probe VIN
b. Channel 2 (SC #2) will be used to probe VBAT
c. Channel 3 (SC #3) will be used to probe VSYS
3.2 Charge Mode
Connect the equipment as follows:
• Power Supply PS #1: VIN of the BQ25185EVM at 5 V
• Power Supply PS #2: VBAT of the BQ25185EVM at 3.7 V
• Scope Channel SC#1: VIN at TP4
• Scope Channel SC#2: VBAT at TP7
• Scope Channel SC#3: VSYS at TP5
Procedure:
1. Connect 13 kOhm resistor using S1 switch box. Verify that the resistance from VSET/ILIM pin to GND is
13kOhm
a. This sets the battery regulation voltage to 4.2 V and the input current limit to 1100 mA
2. Measure the resistance from ISET to GND.
a. The resulting fast charge current will follow the equation:
3. Power on PS #1
a. Verify that the voltage at VSYS is about 4.5 V
4. Power on PS #2
a. Verify that current going into PS#2 is the configured charge current
b. Another method is to use the voltage at the ISET pin. The voltage at the ISET pin
To change the charge current:
1. Use the equation Ichg = 300/RIset (AΩ/Ω)
2. Measure the Resistance on the Iset pin
3. Adjust the R14 potentiometer to get the right RIset for your desired ICHG
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4. Move the jumper on JP1 to the ADJ position
Note
The ISET resistance should only be measured when the device is powered off but the ISET
potentiometer can be adjusted during operation.
To adjust the charge voltage (VSET) and input current limit (ILim):
1. Refer to the VSET and IILIM table in the datasheet to see how the resistance on the IILIM pin affects the
VBATREG and ILim
2. Adjust R15-R18 on S1 to set the correct resistance for your desired VSET and ILim
3. Turn off and on PS#1
Note
The device will change the VSET/ILIM setting each time a new charge cycle is started (when VIN is
plugged in and when /CE is pulled low).
3.3 Factory Mode Entry and Exit
To enter the Factory Mode state, connect the equipment as follows:
• Power Supply PS#1: VIN for the BQ25185EVM at 5V
• Power Supply PS #2: VBAT of the BQ25185EVM at 3.7 V
• Scope Channel SC #1: VIN at TP4
• Scope Channel SC #2: VBAT at TP7
• Scope Channel SC #3: VSYS at TP5
• Scope Channel SC #4: TS/MR at TP11
Procedure
1. Power on PS#2. VSYS should rise to about 3.7 V
2. Power on PS#1. VSYS should rise to 4.5V
3. Press SW1 (the pushbutton on the EVM) for at least 10 seconds
4. Release SW1
5. Disconnect or power off PS#1 from the BQ25185EVM.
6. Observe VSYS pulldown to 0 V
7. After confirming 0 V on VSYS, you may exit Factory mode by inserting VIN ( > VUVLO)
.
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4.2 Layout
Figure 4-2 through Figure 4-7 show the EVM PCB layout images.
Figure 4-2. Top Overlay Figure 4-3. Top Solder
Figure 4-4. Top Layer Figure 4-5. Bottom Layer
Figure 4-6. Bottom Solder Figure 4-7. Bottom Overlay
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4.3 Bill of Materials
The Bill of Materials is shown in the following table.
Table 4-1. Bill of Materials
Designator Quantity Value Description PackageReference PartNumber Manufacturer
C1, C5 2 2.2uF CAP, CERM, 2.2 uF, 25 V,
+/- 10%, X5R, 0402 402 C1005X5R1E225K050BC TDK
C2 1 0.1uF CAP, CERM, 0.1 uF, 25 V,
+/- 10%, X5R, 0402 402 GRM155R61E104KA87D MuRata
C3 1 10uF CAP, CERM, 10 µF, 10
V,+/- 20%, X5R, 0402 402 CL05A106MP8NUB8 Samsung Electro-
Mechanics
C4 1 1uF CAP, CERM, 1 uF, 35 V,
+/- 10%, JB, 0402 402 C1005JB1V105K050BC TDK
C6 1 1uF CAP, CERM, 1 µF, 10
V,+/- 20%, X5R, 0402 402 CC0402MRX5R6BB105 Yageo America
C7 1 4700pF CAP, CERM, 4700 pF, 50
V, +/- 5%, X7R, 0603 603 C0603C472J5RACTU Kemet
D1, D2 2 Green LED, Green, SMD 1.6x0.8x0.8mm LTST-C190GKT Lite-On
J4, J7, J8, J9 4 Header, 100mil, 2x1, Tin,
TH
Header, 2 PIN, 100mil,
Tin PEC02SAAN Sullins Connector
Solutions
J5 1 Header (shrouded), 2mm,
2x1, R/A, SMT Header, 2x1, 2mm, R/A S2B-PH-SM4-TB(LF)(SN) JST Manufacturing
J6 1 Receptacle, USB 3.1
Type C, R/A, Gold, SMT
Receptacle, USB 3.1
Type C, R/A, SMT DX07S024JJ2R1300 JAE Electronics
J11, J12, J13, J14, J15 5 Terminal Block, 2x1,
2.54mm, TH
Terminal Block, 2x1,
2.54mm, TH 282834-2 TE Connectivity
J12 1 Header, 100mil, 3x1, Tin,
TH
Header, 3 PIN, 100mil,
Tin PEC03SAAN Sullins Connector
Solutions
LBL1 1
Thermal Transfer
Printable Labels, 0.650"
W x 0.200" H - 10,000 per
roll
PCB Label 0.650 x 0.200
inch THT-14-423-10 Brady
R1 1 10.0k RES, 10.0 k, 1%, 0.063
W, 0402 402 RC0402FR-0710KL Yageo America
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