Texas Instruments BQ24210/2 User manual

User's Guide
SLUU477B–December 2010–Revised November 2015
800-mA, Single-Input, Single-Cell, Li-Ion Battery Solar
Charger
This user's guide describes the features and operation of the bq24210/2 Evaluation Module (EVM). The
EVM assists users in evaluating the bq24210/2 solar charger. The printed-circuit board for the EVM is
labeled HPA678. The manual includes the bq24210/2EVM 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 Header Descriptions ........................................................................................... 2
1.4 Jumper Settings..................................................................................................... 3
1.5 Recommended Operating Conditions............................................................................ 3
2 Test Summary................................................................................................................ 4
2.1 Definitions............................................................................................................ 4
2.2 Recommended Equipment for Testing........................................................................... 5
2.3 Recommended Test Equipment Setup .......................................................................... 5
2.4 Recommended Test Procedure to Confirm IC Operation ..................................................... 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 (bq24210/2EVM)...................................................................... 5
2 Top Assembly ................................................................................................................ 8
3 Top Layer..................................................................................................................... 9
4 Bottom Layer................................................................................................................ 10
5 bq24210 EVM Schematic ................................................................................................. 11
List of Tables
1 I/O Header Descriptions .................................................................................................... 2
2 Jumper Settings.............................................................................................................. 3
3 Recommended Operating Conditions..................................................................................... 3
4 Bill of Materials............................................................................................................... 7
1
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Introduction www.ti.com
1 Introduction
1.1 EVM Features
• 800-mA, single-input, single-cell Li-ion battery solar charger
• Resistor-programmable setting for charge current and input voltage dynamic power management
• LED Indication for status
• Test points for key signals available for testing purposes – easy probe hook-up
• Jumpers available – easy to change setting
1.2 General Description
The bq24210/2 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 integrated circuit (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 bq24210 has an EN pin whereas the bq24212 has
a MODE pin. See the data sheet for an explanation of the differences between the two pins.
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 additional details, see the bq24210 (SLUSA76) or bq24212 (SLUSAL2) data sheet.
1.3 I/O Header Descriptions
Table 1. I/O Header Descriptions
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 (BQ24210 only) Chip Enable control. This pin must be pulled low in order for the device to
operate.
J3-MODE (BQ24212 only) Chip MODE control. See data sheet for explanation of chip operation when
MODE is high and low.
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
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ISE T
ISET
O UT
K
R =
I
( )
DPM DPM_1
VDPM
DPM
VBUS_ VBUS_
R = KVBUS_
-
www.ti.com Introduction
1.4 Jumper Settings
Table 2. Jumper Settings
Jack Description Factory Setting
JP1 Programs the fast-charge current setting. 500 mA when JP1 ON; external setting Jumper OFF (external setting)
when JP1 OFF
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)
when JP3 OFF.
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)
1-2 : External TS input
2-3 : Internal TS setting
JP6 The pullup power source supplies for the LEDs Jumper ON 2-3 (VBUS)
1-2 : BAT
2-3 : VBUS
JP7 Charger EN / MODE Jumper ON 1-2 (charger OFF /
1-2 : OFF/HIGH MODE High)
2-3 : ON/LOW
1.5 Recommended Operating Conditions
Table 3. Recommended Operating Conditions
Description Min Typ Max Unit Notes
Supply voltage, VBUS Input voltage 4.5 7.3 V
Battery voltage, VBAT Voltage applied at VBAT terminal of J2 0 4.2 V
Supply current Maximum input current 0 0.8 A
Charge current, Ichrg Battery charge current 0 0.8 A
Operating junction temperature 0 125 °C
range, TJ
An external resistor is used to program the VBUS_DPM. The programming resistor, RVDPM is dictated by
the following equation:
(1)
Where:
VBUS_DPM is the desired input voltage regulation voltage threshold.
VBUS_DPM_1 is the built-in offset threshold, nominally 3.5 V.
KVBUS_DPM is a gain factor found in the electrical specification.
If VDPM pin is shorted to VSS; the VBUS_DPM must be clamped to 3.65 V.
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 + 100 mV. (BAT > 3.65 V) or 3.75 V (BAT ≤3.4
V).
Connecting JP3 set 4.5 V VDPM on EVM.
An external resistor is used to program the output current (50-800 mA). The equation for charge current is:
(2)
Where, IOUT is the desired fast-charge current; KISET is a gain factor found in the specification.
The termination and precharge current are internally set at 10% and 20% of fast-charge current,
respectively. The precharge-to-fast-charge, Vlowv threshold is set to 2.5 V.
Connecting JP1 set 500 mADC for fast-charge current and 100 mADC for precharge current on EVM.
3
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Test Summary www.ti.com
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
marked VDPM.
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 occur. If they do not occur, the unit under test has failed.
Assembly drawings have location for jumpers, test points, and individual components
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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
www.ti.com Test Summary
2.2 Recommended Equipment for Testing
2.2.1 Power Supplies
Power Supply #1 (PS#1): a power supply capable of supplying 20 V at 1 A
2.2.2 Loads
A 20-V (or above), 1-A (or above) electronic load that can operate at constant current and constant
voltage mode or equivalent
2.2.3 Meters
Four Fluke 75 multimeters, (equivalent or better) or two equivalent voltage meters and two equivalent
current meters. The current meters must be capable of measuring 1 A + current.
2.3 Recommended Test Equipment Setup
1. Set the power supply #1 (PS#1) for 6.5 V ± 200 mVDC, 1-A ± 0.1-A current limit, and then turn off
supply.
2. Connect the output of PS#1 in series with a current meter (multimeter) 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/ MODE high).
Figure 1. Original Test Setup for HPA678 (bq24210/2EVM)
5
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2.4 Recommended Test Procedure to Confirm IC Operation
2.4.1 Power Supply
Make sure that EQUIPMENT SETUP steps are followed.
Disconnect LOAD #1. Turn on PS#1.
Measure →V(J1(VBUS)) = 6.5 V ± 200 mV
Measure →V(J2(VBAT)) = 0 V ± 200 mV
Measure →V(J4(VTSB)) = 0 V ± 200 mV
Observe →D1 (PG) ON, D2 (CHG) OFF
2.4.2 Charger Enable and Battery Detection
Connect JP1; Connect 2-3 of JP7 (Charger ON/MODE High)
Measure →V(J4(VTSB)) = 2.2 V ± 300 mV
Connect 2-3 of JP5 (Internal TS);
Adjust R6 until V(JP4-1) = 0.7 V ± 200 mV
Measure →V(J2(VBAT))=4.2 V ± 200 mV
Observe →D1 (PG) ON, D2 (CHG) OFF
2.4.3 Charge Current/Voltage Regulation
Reconnect LOAD#1. Turn on. Use the constant voltage mode.
Connect JP1; Set the output voltage to be 2.2 V.
Measure →I(J2(VBAT)) = 0.1 A ± 50 mA
Observe →D1 (PG) ON, D2 (CHG) ON
Increase the voltage of LOAD#1 to be 3.5 V.
Measure →I(J2(VBAT)) = 0.5 A ± 100 mA
Observe →D1 (PG) ON, D2 (CHG) ON
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. Ensure that sufficient thermal vias are right underneath the IC, connecting to the ground
plane on the other layers.
2. Make the interconnections of the decoupling capacitors for VBUS, BATC to the IC as short as possible.
3. Use the EVM layout for design reference.
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www.ti.com 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
Count RefDes Value Description Size Part Number
-001 -002
1 1 C1 10uF Capacitor, Ceramic, 25V,X7R, 10% 1206 STD
2 2 C2, C4 0.1uF Capacitor, Ceramic, 25V, X7R, 10% 0603 STD
1 1 C3 10uF Capacitor, Ceramic, 6.3V, X7R, 10% 0805 STD
0 0 C5, C6 Open Capacitor, Ceramic, 25V, X7R, 10% 0603 STD
2 2 D1, D2 LTST-C190CKT Diode, LED, Red, 1.8-V, 20-mA, 20-mcd 0603 LTST-C190CKT
1 1 D3 BZX84C5V1-7 Diode, Zener, 5.1V, 350-mW SOT-23 BZX84C5V1-7
1 1 J1 PEC02SAAN Header, Male 2-pin, 100mil spacing, 0.100 inch x 2 PEC02SAAN
1 1 J2 ED555/3DS Terminal Block, 3-pin, 6-A, 3.5mm 0.41 x 0.25 inch ED555/3DS
1 1 J3 PEC05SAAN Header, Male 5-pin, 100mil spacing, 0.100 inch x 5 PEC05SAAN
1 1 J4 PEC03SAAN Header, Male 3-pin, 100mil spacing, 0.100 inch x 3 PEC03SAAN
4 4 JP1, JP2, JP3, PEC02SAAN Header, 2-pin, 100mil spacing, 0.100 inch x 2 PEC02SAAN
JP4
3 3 JP5, JP6, JP7 PEC03SAAN Header, 3 pin, 100mil spacing, 0.100 inch x 3 PEC03SAAN
1 1 R1 21.5k Resistor, Chip, 1/16W, 1% 0603 STD
2 2 R2, R4 1.50K Resistor, Chip, 1/16W, 1% 0603 STD
1 1 R3 750 Resistor, Chip, 1/16W, 1% 0603 STD
1 1 R5 6.65k Resistor, Chip, 1/16W, 1% 0603 Std
1 1 R6 100k Potentiometer, 1/4 Cermet, 12-Turn, Top-Adjust 0.25x0.17 inch 3266W-1-104LF
1 1 R7 4.75k Resistor, Chip, 1/16-W, 1% 0603 STD
0 0 TP1, TP2, TP3 Open Test Point, 0.020 Hole STD
1 0 U1 BQ24210DQC IC, 800mA, Single-Input, Single Cell Li-Ion Battery Solar TDFN-10 BQ24210DQC
Charger
0 1 U1 BQ24212DQC IC, 800mA, Single-Input, Single Cell Li-Ion Battery Solar TDFN-10 BQ24212DQC
Charger
7 7 — Shunt, 100-mil, Black 0.1 929950-00
1 1 — PCB, 2.64" x 2.1" x 0.062" HPA678
1 1 — Label 1.25 x 0.25 inch THT-13-457-10
Notes: 1. These assemblies are ESD sensitive, ESD precautions shall be observed.
2. These assemblies must be clean and free from flux and all contaminants. Use of no clean flux is not acceptable.
3. These assemblies must comply with workmanship standards IPC-A-610 Class 2.
4. Ref designators marked with an asterisk ('**') cannot be substituted. All other components can be substituted with equivalent MFG's
components.
5. Install label after final wash. Text shall be 8 pt font. Text shall be per Table 1.
Table 1
Assembly Text
Number
HPA678-001 BQ24210EVM-678
HPA678-002 BQ24212EVM-678
7
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4.2 Board Layout
Figure 2. Top Assembly
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Figure 3. Top Layer
9
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Figure 4. Bottom Layer
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