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 EVM Features ...................................................................................................... 2
1.2 General Description ................................................................................................ 2
1.3 I/O Description ...................................................................................................... 2
1.4 Control and Key Parameters Setting ............................................................................ 3
1.5 Recommendd Operating Conditions ............................................................................ 3
2 Test Summary ............................................................................................................... 4
2.1 Definitions ........................................................................................................... 4
2.2 Safety ................................................................................................................ 4
2.3 Quality ............................................................................................................... 4
2.4 Apparel .............................................................................................................. 4
2.5 Equipment ........................................................................................................... 5
2.6 Equipment Setup ................................................................................................... 5
2.7 Procedure ........................................................................................................... 6
3 PCB Layout Guideline ...................................................................................................... 6
4 Bill of Materials, Board Layout and Schematics ........................................................................ 7
4.1 Bill of Materials ..................................................................................................... 7
4.2 Board Layout ....................................................................................................... 8
4.3 Schematics ........................................................................................................ 11
List of Figures
1 Original Test Setup for HPA678 (bq24210 EVM)....................................................................... 5
2 Top Assembly ............................................................................................................... 8
3 Top Layer .................................................................................................................... 9
4 Bottom Layer............................................................................................................... 10
5 bq24210 EVM Schematic ................................................................................................ 11
List of Tables
1 I/O Description............................................................................................................... 2
2 Control and Key Parameters Setting..................................................................................... 3
3 Recommendd Operating Conditions ..................................................................................... 3
4 Bill of Materials.............................................................................................................. 7
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1
Introduction
1 Introduction
1.1 EVM Features
• Evaluation Module for bq24210
• 800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger with Power Path
• Resistor-programmable setting for charge current and input voltage dynamic power management
• LED Indication for Status
• Test Points for Key Signals Available for Testing Purpose – Easy Probe Hook-up
• Jumpers Available – Easy to Change Setting
1.2 General Description
The bq24210 series of devices are highly integrated Li-ion linear chargers devices targeted at
space-limited portable applications. The high input voltage range with input overvoltage protection
supports low-cost unregulated adapters. The input voltage regulation loop with programmable input
voltage regulation threshold make it suitable for charging from alternative power sources, such as solar
panel or inductive charging pad. The IC has a single power output that charges the battery. A system load
can be placed in parallel with the battery as long as the average system load does not keep the battery
from charging fully during the 10 hour safety timer.
The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge
phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an
internal temperature threshold is exceeded.
For details, see BQ24210 data sheet (SLUSA76).
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1.3 I/O Description
Jack Description
J1–VBUS Positive input
J1–GND Negative input
J2–BAT Charger output
J2–GND Ground
J2–TS Temperature qualification input
J3-GND Ground
J3-VDPM Programs the input voltage regulation threshold
J3-CHG Charge status indication
J3-EN Chip enable control
J3-PG Power present indication
J4-ISET Programs the fast-charge current setting
J4-VTSB TS bias reference voltage pin, regulated output
J4-GND Ground
Table 1. I/O Description
2
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( )
DPM DPM_ 1
VDPM
DPM
VBUS_ VBUS _
R =
KVBUS_
-
ISET
ISET
O UT
K
R =
I
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1.4 Control and Key Parameters Setting
Table 2. Control and Key Parameters Setting
Jack Description Factory Setting
JP1 Programs the fast-charge current setting. 500mA when JP1 ON; external setting Jumper OFF (external setting)
JP2 Connect /EN and /PG together when JP2 ON to enable charger when power present Jumper OFF (external /EN)
JP3 Programs the input voltage regulation threshold. 4.5V when JP3 ON; external setting Jumper OFF (external setting)
JP4 Limited power charge mode (LPCM) when JP4 ON; normal operation when JP4 OFF Jumper OFF (normal operation)
JP5 Select external TS input or internal TS setting Jumper ON 1-2 (external TS)
JP6 The pull-up power source supplies for the LEDs Jumper ON 2-3 (VBUS)
JP7 Charger ON/OFF command Jumper ON 1-2 (charger OFF)
when JP1 OFF
when JP3 OFF.
1-2 : External TS input
2-3 : Internal TS setting
1-2 : BAT
2-3 : VBUS
1-2 : OFF
2-3 : ON
1.5 Recommendd Operating Conditions
Table 3. Recommendd Operating Conditions
Description Min Typ Max Unit Notes
Supply voltage, V
Battery voltage, V
Supply current Maximum input current 0 0.8 A
Charge current, I
Operating junction temperature 0 125 °C
range, T
J
BUS
BAT
chrg
Input voltage 4.5 7.3 V
Voltage applied at VBAT terminal of J2 0 4.2 V
Battery charge current 0 0.8 A
Introduction
An external resistor is used to program the VBUS_DPM. The programming resistor, R
is dictated by
VDPM
the following equation:
Where:
VBUS_
VBUS_
K
VBUS_DPM
If VDPM pin is shorted to VSS, the VBUS_
is the desired input voltage regulation voltage threshold;
DPM
is the built-in offset threshold, nominally 3.5V
DPM_1
is a gain factor found in the electrical specification.
should be clamped to 3.65V.
DPM
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 V
, which is BAT+100mV (BAT>3.65V) or 3.75V (BAT≤3.4V).
TRK
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:
Where, I
is the desired fast charge current; K
OUT
is a gain factor found in the spec.
ISET
The termination and pre-charge current are internally set at 10% and 20% of fast charge current
respectively. The pre-charge-to-fast-charge, V
threshold is set to 2.5V.
lowv
Connecting JP1 set 500mADC for fast charge current and 100mADC for pre-charge current on EVM.
(1)
(2)
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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: External load name (LOADR, LOADI)
V(TPyyy): Voltage at internal test point (TPyyy). For example, V(TP1) means the voltage at TP1.
V(Jxx): Voltage at jack terminal (Jxx).
V(XXX): Voltage at (XXX). For example, V(VDPM) means the voltage at the test point which is
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
Observe →A,B Observe if A, B occur. If they do not occur, the unit under test has failed.
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marked "VDPM".
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
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BQ24210 EVM
HPA678
GND
J1
VBUS
J2
GND
BAT
APPLICATION CIRCUIT
U1
V
Iin
I
Power supply
#1
IBAT
V
Load #1
I
TS
PG
JP1
D1
LED
CHG
D2
J4
JP4
JP5 JP7 JP6 JP2
J3
JP3
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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).
Test Summary
SLUU477–December 2010 800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger with Power Path
Figure 1. Original Test Setup for HPA678 (bq24210 EVM)
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PCB Layout Guideline
2.7 Procedure
2.7.1 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
2.7.2 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
2.7.3 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
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2.7.4 VDPM ((Input Voltage Regulation) Setting)
Disconnect J3, measure the resistance between J3-1 to GND (6.65kΩ ±10%)
2.7.5 Test Complete
Turn off the power supply and remove all connections from the unit under test (UUT).
3 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
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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 MFR
1 C1 10 µF Capacitor, Ceramic, 25V,X7R, 10% 1206 STD STD
2 C2, C4 0.1 µF Capacitor, Ceramic, 25V, X7R, 10% 0603 STD STD
1 C3 10 µF Capacitor, Ceramic, 6.3V, X7R, 10% 0805 STD STD
0 C5, C6 Open Capacitor, Ceramic, 25V, X7R, 10% 0603 STD STD
2 D1, D2 LTST-C190CKT Diode, LED, Red, 1.8-V, 20-mA, 20-mcd 0603 LTST-C190CKT Liteon
1 D3 BZX84C5V1-7 Diode, Zener, 5.1V, 350-mW SOT-23 BZX84C5V1-7 Diodes
1 J1 PEC02SAAN Header, Male 2-pin, 100mil spacing, 0.100 inch x 2 PEC02SAAN Sullins
1 J2 ED555/3DS Terminal Block, 3-pin, 6-A, 3.5mm 0.41 x 0.25 inch ED555/3DS OST
1 J3 PEC05SAAN Header, Male 5-pin, 100mil spacing 0.100 inch x 5 PEC05SAAN Sullins
1 J4 PEC03SAAN Header, Male 3-pin, 100mil spacing 0.100 inch x 3 PEC03SAAN Sullins
4 JP1, JP2, PEC02SAAN Header, 2-pin, 100mil spacing, 0.100 inch x 2 PEC02SAAN Sullins
JP3, JP4
3 JP5, JP6, PEC03SAAN Header, 3 pin, 100mil spacing, 0.100 inch x 3 PEC03SAAN Sullins
JP7
1 R1 21.5k Resistor, Chip, 1/16W, 1% 0603 STD STD
2 R2, R4 1.50K Resistor, Chip, 1/16W, 1% 0603 STD STD
1 R3 750 Resistor, Chip, 1/16W, 1% 0603 STD STD
1 R5 6.65k Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R6 100k Potentiometer, 1/4 Cermet, 12-Turn, Top-Adjust 0.25x 0.17 inch 3266W-1-104LF Bourns
1 R7 4.75k Resistor, Chip, 1/16-W, 1% 0603 STD STD
0 TP1, TP2, Open Test Point, 0.020 Hole STD STD
TP3
1 U1 BQ24210DCQ IC, 800mA, Single-Input, Single Cell Li-Ion Battery Solar TDFN-10 BQ24210DCQ TI
7 — Shunt, 100-mil, Black 0.1 929950-00 3M
1 — PCB HPA678 Any
1 — Label 1.25 x 0.25 inch THT-13-457-10 Brady
Charger with bi-directional Power Path
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Bill of Materials, Board Layout and Schematics
4.2 Board Layout
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Figure 2. Top Assembly
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Bill of Materials, Board Layout and Schematics
Figure 3. Top Layer
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Bill of Materials, Board Layout and Schematics
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Figure 4. Bottom Layer
10
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4.3 Schematics
Bill of Materials, Board Layout and Schematics
Figure 5. bq24210 EVM Schematic
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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
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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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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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