User's Guide
SLUU477–December 2010
800mA, Single-Input, Single Cell Li-Ion Battery Solar
Charger with Power Path
This user's guide describes the features and operation of the bq24210EVM Evaluation Module (EVM). The
EVM assists users in evaluating the bq24210 solar chager. The EVM is also called the HPA678. The
manual includes the bq24210EVM bill of materials, board layout, and schematic.
Contents
1
Introduction .................................................................................................................. 2
1.1
1.2
1.3
1.4
1.5
EVM Features ...................................................................................................... 2
General Description ................................................................................................ 2
I/O Description ...................................................................................................... 2
Control and Key Parameters Setting ............................................................................ 3
Recommendd Operating Conditions ............................................................................ 3
2
Test Summary ............................................................................................................... 4
2.1
2.2
2.3
2.4
2.5
2.6
2.7
Definitions ........................................................................................................... 4
Safety ................................................................................................................ 4
Quality ............................................................................................................... 4
Apparel .............................................................................................................. 4
Equipment ........................................................................................................... 5
Equipment Setup ................................................................................................... 5
Procedure ........................................................................................................... 6
3
4
PCB Layout Guideline ...................................................................................................... 6
Bill of Materials, Board Layout and Schematics ........................................................................ 7
4.1
4.2
4.3
Bill of Materials ..................................................................................................... 7
Board Layout ....................................................................................................... 8
Schematics ........................................................................................................ 11
List of Figures
1
2
3
4
5
Original Test Setup for HPA678 (bq24210 EVM).......................................................................
Top Assembly ...............................................................................................................
Top Layer ....................................................................................................................
Bottom Layer............................................................................................................... 10
bq24210 EVM Schematic ................................................................................................ 11
List of Tables
1
2
3
4
I/O Description...............................................................................................................
Control and Key Parameters Setting .....................................................................................
Recommendd Operating Conditions .....................................................................................
Bill of Materials ..............................................................................................................
1
SLUU477–December 2010
800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger with Power Path
© 2010, Texas Instruments Incorporated
Introduction
1.4 Control and Key Parameters Setting
Table 2. Control and Key Parameters Setting
Jack
Description
Factory Setting
Jumper OFF (external setting)
JP1
Programs the fast-charge current setting. 500mA when JP1 ON; external setting
when JP1 OFF
JP2
JP3
Connect /EN and /PG together when JP2 ON to enable charger when power present Jumper OFF (external /EN)
Programs the input voltage regulation threshold. 4.5V when JP3 ON; external setting Jumper OFF (external setting)
when JP3 OFF.
JP4
JP5
Limited power charge mode (LPCM) when JP4 ON; normal operation when JP4 OFF Jumper OFF (normal operation)
Select external TS input or internal TS setting
1-2 : External TS input
Jumper ON 1-2 (external TS)
2-3 : Internal TS setting
JP6
JP7
The pull-up power source supplies for the LEDs
1-2 : BAT
2-3 : VBUS
Jumper ON 2-3 (VBUS)
Charger ON/OFF command
1-2 : OFF
Jumper ON 1-2 (charger OFF)
2-3 : ON
1.5 Recommendd Operating Conditions
Table 3. Recommendd Operating Conditions
Description
Min Typ
Max
7.3
4.2
0.8
0.8
125
Unit
V
Notes
Supply voltage, VBUS
Battery voltage, VBAT
Supply current
Input voltage
4.5
0
Voltage applied at VBAT terminal of J2
Maximum input current
Battery charge current
V
0
A
Charge current, Ichrg
0
A
Operating junction temperature
range, TJ
0
°C
An external resistor is used to program the VBUS_DPM. The programming resistor, RVDPM is dictated by
the following equation:
VBUS_
(
- VBUS_DPM_1
)
DPM
RVDPM
=
KVBUS_DPM
(1)
Where:
VBUS_DPM is the desired input voltage regulation voltage threshold;
VBUS_DPM_1 is the built-in offset threshold, nominally 3.5V
KVBUS_DPM is a gain factor found in the electrical specification.
If VDPM pin is shorted to VSS, the VBUS_DPM should be clamped to 3.65V.
If the VDPM pin is floated (open circuit), the IC operates in Battery Tracking Mode. In this case, VBUS
DPM threshold is internally set as VTRK, which is BAT+100mV (BAT>3.65V) or 3.75V (BAT≤3.4V).
Connecting JP3 set 4.5V VDPM on EVM.
An external resistor is used to program the output current (50-800mA). The equation for charge current is:
KISET
RISET
=
IOUT
(2)
Where, IOUT is the desired fast charge current; KISET is a gain factor found in the spec.
The termination and pre-charge current are internally set at 10% and 20% of fast charge current
respectively. The pre-charge-to-fast-charge, Vlowv threshold is set to 2.5V.
Connecting JP1 set 500mADC for fast charge current and 100mADC for pre-charge current on EVM.
3
SLUU477–December 2010
800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger with Power Path
© 2010, Texas Instruments Incorporated
Test Summary
2
Test Summary
2.1 Definitions
This procedure details how to configure the HPA678 evaluation board. On the test procedure, the
following naming conventions are followed.
VXXX :
External voltage supply name (VBUS, VBAT)
LOADW:
V(TPyyy):
V(Jxx):
External load name (LOADR, LOADI)
Voltage at internal test point (TPyyy). For example, V(TP1) means the voltage at TP1.
Voltage at jack terminal (Jxx).
V(XXX):
Voltage at (XXX). For example, V(VDPM) means the voltage at the test point which is
marked "VDPM".
V(XXX, YYY): Voltage across point XXX and YYY.
I(JXX(YYY)):
Jxx(BBB):
Jxx ON :
Current going out from the YYY terminal of jack XX.
Terminal or pin BBB of jack xx
Internal jumper Jxx terminals are shorted
Internal jumper Jxx terminals are open
Jxx OFF:
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 occur. If they do not occur, the unit under test has failed.
Assembly drawings have location for jumpers, test points and individual components
2.2 Safety
1. Safety Glasses are to be worn.
2. This test must be performed by qualified personnel trained in electronics theory and understand the
risks and hazards of the assembly to be tested.
3. ESD precautions must be followed while handling electronic assemblies while performing this test.
4. Precautions should be observed to avoid touching areas of the assembly that may get hot or present a
shock hazard during testing.
2.3 Quality
1. Test data shall be made available upon request by Texas Instruments.
2.4 Apparel
1. Electrostatic smock
2. Electrostatic Gloves or finger cots
3. Safety Glasses
4. Ground ESD wrist strap
4
800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger with Power Path
SLUU477–December 2010
© 2010, Texas Instruments Incorporated
Test Summary
2.5 Equipment
2.5.1
Power Supplies
Power Supply #1 (PS#1): a power supply capable of supplying 20-V at 1-A is required.
2.5.2
Loads
LOAD #1 A 20V (or above), 1A (or above) electronic load that can operate at constant current and
constant voltage mode.
Or: equivalent.
2.5.3
Meters
Four Fluke 75 multi-meters, (equivalent or better)
Or: Two equivalent voltage meters and two equivalent current meters.
The current meters must be capable of measuring 1A+ current.
2.6 Equipment Setup
1. Set the power supply #1 (PS#1) for 6.5V ± 200mVDC, 1A ± 0.1A current limit and then turn off supply.
2. Connect the output of PS#1 in series with a current meter (multi-meter) to J1 (VBUS, GND).
3. Connect a voltage meter across J1 (VBUS, GND).
4. Connect Load #1 in series with a current meter to J2 (VBAT, GND). Turn off Load #1.
5. Connect a voltage meter across J2 (VBAT, GND).
6. Check all jumper shunts. JP1: OFF; JP2: OFF; JP3: OFF; JP4: OFF; JP5: connect 1-2 (External TS);
JP6: connect 2-3 (VBUS); JP7: connect 1-2 (charger OFF).
BQ24210 EVM
HPA678
J2
J1
I
Power supply
#1
BAT
Iin
I
GND
Load #1
V
IBAT
GND
TS
V
VBUS
U1
APPLICATION CIRCUIT
JP3
JP1
LED
CHG
PG
D1
D2
J4
J3
JP4
JP5
JP7
JP6
JP2
Figure 1. Original Test Setup for HPA678 (bq24210 EVM)
5
SLUU477–December 2010
800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger with Power Path
© 2010, Texas Instruments Incorporated
PCB Layout Guideline
2.7 Procedure
2.7.1
2.7.2
2.7.3
Power Supply
Make sure EQUIPMENT SETUP steps are followed.
Disconnect LOAD #1. Turn on PS#1.
Measure → V(J1(VBUS)) = 6.5V ± 200mV
Measure → V(J2(VBAT)) = 0V ± 200mV
Measure → V(J4(VTSB)) = 0V ± 200mV
Observe → D1 (PG) ON, D2 (CHG) OFF
Charger Enable and Battery Detection
Connect JP1; Connect 2-3 of JP7 (Charger ON)
Measure → V(J4(VTSB)) = 2.2V ± 300mV
Connect 2-3 of JP5 (Internal TS);
Adjust R6 until V(JP4-1) = 0.7V ± 200mV
Measure → V(J2(VBAT))=4.2V 200mV
Observe → D1 (PG) ON, D2 (CHG) OFF
Charge Current/Voltage Regulation
Reconnect LOAD#1. Turn on. Use the constant voltage mode.
Connect JP1; Set the output voltage to be 2.2V.
Measure → I(J2(VBAT)) = 0.1A ± 50mA
Observe → D1 (PG) ON, D2 (CHG) ON
Increase the voltage of LOAD#1 to be 3.5 V.
Measure → I(J2(VBAT)) = 0.5A ± 100mA
Observe → D1 (PG) ON, D2 (CHG) ON
2.7.4
2.7.5
3
VDPM ((Input Voltage Regulation) Setting)
Disconnect J3, measure the resistance between J3-1 to GND (6.65kΩ ±10%)
Test Complete
Turn off the power supply and remove all connections from the unit under test (UUT).
PCB Layout Guideline
1. It is critical that the exposed thermal pad on the backside of the bq24210 package be soldered to the
PCB ground. Make sure there are sufficient thermal vias right underneath the IC, connecting to the
ground plane on the other layers.
2. Decoupling capacitors for VBUS, BATC should make the interconnections to the IC as short as
possible.
3. Take the EVM layout for design reference.
6
800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger with Power Path
SLUU477–December 2010
© 2010, Texas Instruments Incorporated
Bill of Materials, Board Layout and Schematics
4
Bill of Materials, Board Layout and Schematics
4.1 Bill of Materials
Table 4. Bill of Materials
-001 RefDes
Value
Description
SIZE
Part Number
STD
MFR
1
2
1
0
2
1
1
1
1
1
4
C1
10 µF
Capacitor, Ceramic, 25V,X7R, 10%
Capacitor, Ceramic, 25V, X7R, 10%
Capacitor, Ceramic, 6.3V, X7R, 10%
Capacitor, Ceramic, 25V, X7R, 10%
Diode, LED, Red, 1.8-V, 20-mA, 20-mcd
Diode, Zener, 5.1V, 350-mW
1206
STD
C2, C4
C3
0.1 µF
0603
STD
STD
10 µF
0805
STD
STD
C5, C6
D1, D2
D3
Open
0603
STD
STD
LTST-C190CKT
BZX84C5V1-7
PEC02SAAN
ED555/3DS
PEC05SAAN
PEC03SAAN
0603
LTST-C190CKT
BZX84C5V1-7
PEC02SAAN
ED555/3DS
PEC05SAAN
PEC03SAAN
PEC02SAAN
Liteon
Diodes
Sullins
OST
SOT-23
J1
Header, Male 2-pin, 100mil spacing,
Terminal Block, 3-pin, 6-A, 3.5mm
Header, Male 5-pin, 100mil spacing
Header, Male 3-pin, 100mil spacing
Header, 2-pin, 100mil spacing,
0.100 inch x 2
0.41 x 0.25 inch
0.100 inch x 5
0.100 inch x 3
0.100 inch x 2
J2
J3
Sullins
Sullins
Sullins
J4
JP1, JP2, PEC02SAAN
JP3, JP4
3
JP5, JP6, PEC03SAAN
JP7
Header, 3 pin, 100mil spacing,
0.100 inch x 3
PEC03SAAN
Sullins
1
2
1
1
1
1
0
R1
21.5k
1.50K
750
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Resistor, Chip, 1/16W, 1%
Potentiometer, 1/4 Cermet, 12-Turn, Top-Adjust
Resistor, Chip, 1/16-W, 1%
Test Point, 0.020 Hole
0603
STD
STD
STD
STD
Std
R2, R4
R3
0603
STD
0603
STD
R5
6.65k
100k
4.75k
0603
Std
R6
0.25 x 0.17 inch
0603
3266W-1-104LF
Bourns
STD
STD
R7
STD
STD
TP1, TP2, Open
TP3
1
U1
BQ24210DCQ
IC, 800mA, Single-Input, Single Cell Li-Ion Battery Solar
Charger with bi-directional Power Path
TDFN-10
0.1
BQ24210DCQ
TI
7
1
1
—
—
—
Shunt, 100-mil, Black
929950-00
HPA678
3M
PCB
Any
Label
1.25 x 0.25 inch
THT-13-457-10
Brady
7
SLUU477–December 2010
800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger with Power Path
© 2010, Texas Instruments Incorporated
Evaluation Board/Kit Important Notice
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the
product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are
not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations,
including product safety and environmental measures typically found in end products that incorporate such semiconductor
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Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30
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This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
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EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of 4.5 V to 7.3 V and the output voltage range of 0 V to 4.2 V .
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load
specification, please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than 60°C. The EVM is designed to
operate properly with certain components above 125°C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.
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Copyright © 2010, Texas Instruments Incorporated
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