Battery Charger. bq25071 Datasheet

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bq25071 Datasheet
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Part bq25071
Description Battery Charger
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bq25071
SLUSBK6 – JULY 2014
bq25071 1-A, Single-Input, Single-Cell LiFePO4 Linear Battery Charger with 50 mA LDO
1 Features
1 Single Cell LiFePO4 Charging Algorithm
• 30V Input Rating, With 10.5 V Overvoltage
Protection (OVP)
• 50mA Integrated Low Dropout Linear Regulator
(LDO)
• Programmable Charge Current Through ISET and
EN Terminals
• 7% Charge Current Regulation Accuracy
• Thermal Regulation and Protection
• Soft-Start Feature to Reduce Inrush Current
• Battery NTC Monitoring
• Charging Status Indication
2 Applications
• Smart Phones
• Mobile Phones
• Portable Media Players
• Low Power Handheld Devices
3 Description
The bq25071 is a highly integrated, linear, LiFePO4
battery charger targeted at space-limited portable
applications. It accepts power from either a USB port
or AC adapter and charges a single-cell LiFePO4
battery with up to 1 A of charge current. The 30 V
input rating with 10.5 V input overvoltage protection
supports low-cost unregulated adapters.
The bq25071 has a single power output that
simultaneously charges the battery and powers the
system. The input current is programmable from 100
mA up to 1 A using the ISET input or configurable for
USB500. There is also a 4.9 V ±10% 50 mA LDO
integrated into the IC for supplying low power
external circuitry.
The LiFePO4 charging algorithm removes the current
taper typically seen as part of the constant voltage
mode control used in Li-Ion battery charge cycles
which reduces charge time significantly. Instead, the
battery is fast charged to the overcharge voltage and
then allowed to relax to a lower float charge voltage
threshold. The charger integrates the power stage
with the charge current and voltage sense to achieve
a high level of accuracy in the current and voltage
regulation loops. An internal control loop monitors the
IC junction temperature through the charge cycle and
reduces the charge current if an internal temperature
threshold is exceeded.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq25071
WSON (10)
2.00mm x 3.00mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Application Schematic
USB or TA
VBUS
GND
D+
D-
bq25071
CHG
IN
OUT
EN
ISET
BAT
TS
GND
LDO
PWRPD
Pull-Up
STATUS
VDD
ABB
TEMP
PACK +
PACK -
VCHG DET
USB DET
VUSBIN
ACDET
GPIO
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



Texas Instruments bq25071
bq25071
SLUSBK6 – JULY 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Application Schematic .......................................... 1
5 Revision History..................................................... 2
6 Device Comparison Table..................................... 3
7 Pin Configuration and Functions ......................... 3
8 Specifications......................................................... 4
8.1 Absolute Maximum Ratings ..................................... 4
8.2 Handling Ratings....................................................... 4
8.3 Recommended Operating Conditions....................... 4
8.4 Thermal Information .................................................. 4
8.5 Electrical Characteristics........................................... 5
8.6 Timing Requirements ................................................ 6
8.7 Typical Characteristics .............................................. 7
9 Detailed Description .............................................. 8
9.1 Overview ................................................................... 8
9.2 Functional Block Diagram ......................................... 9
9.3 Feature Description................................................. 10
9.4 Device Functional Modes........................................ 12
10 Application and Implementation........................ 14
10.1 Application Information.......................................... 14
10.2 Typical Application ............................................... 14
11 Power Supply Recommendations ..................... 17
12 Layout................................................................... 17
12.1 Layout Guidelines ................................................. 17
12.2 Layout Example .................................................... 17
13 Device and Documentation Support ................. 19
13.1 Trademarks ........................................................... 19
13.2 Electrostatic Discharge Caution ............................ 19
13.3 Glossary ................................................................ 19
14 Mechanical, Packaging, and Orderable
Information ........................................................... 19
5 Revision History
DATE
July 2014
REVISION
*
NOTES
Initial release.
2 Submit Documentation Feedback
Product Folder Links: bq25071
Copyright © 2014, Texas Instruments Incorporated



Texas Instruments bq25071
www.ti.com
6 Device Comparison Table
PART NUMBER
bq25071DQCR
bq25071DQCT
VBAT(OVCH)
3.7 V
3.7 V
VBAT(FLOAT)
3.5 V
3.5 V
bq25071
SLUSBK6 – JULY 2014
V(OVP)
10.5 V
10.5 V
V(LDO)
4.9 V
4.9 V
7 Pin Configuration and Functions
bq25071
(TOP VIEW)
IN 1
ISET 2
GND 3
LDO 4
TS 5
10 OUT
9 GND
8 CHG
7 EN
6 BAT
10 -pin 2mm x 3mm DFN
PIN
NAME
NO.
IN 1
ISET
GND
LDO
2
3, 9
4
TS 5
BAT 6
EN 7
CHG
OUT
Thermal
Pad
8
10
Pad
Pin Functions
I/O DESCRIPTION
I
Input power supply. IN is connected to the external DC supply (AC adapter or USB port). Bypass IN to GND
with at least a 0.1 μF ceramic capacitor.
Input current programming bias pin. Connect a resistor from ISET to GND to program the input current limit
O when the user programmable mode is selected by grounding the EN pin. The resistor range is between 1 kΩ
and 10 kΩ to set the current between 100 mA and 1 A.
– Ground pin. Connect to the thermal pad and the ground plane of the circuit.
O
LDO output. LDO is regulated to 4.9V and drives up to 50 mA. Bypass LDO to GND with a 0.1 μF ceramic
capacitor. LDO is enabled when V(UVLO) < VIN < V(OVP).
Battery pack NTC monitoring input. Connect a resistor divider from LDO to GND with TS connected to the
I
center tap to set the charge temperature window. The battery pack NTC is connected in parallel with the
bottom resistor of the divider. See the Detailed Design Procedure section for details on the selecting the
proper component values.
I BAT is the sense input for the battery voltage. Connect BAT and OUT to the battery.
Enable input. Drive EN high to disable the IC. Connect EN to GND to place the bq25071 in the user
I
programmable mode using the ISET input where the input current is programmed. Leave EN floating to place
the bq25071 in USB500 mode. See the Input Current Limit Control (EN) section for details on using the EN
interface.
O
Charge status indicator open-drain output. CHG is pulled low while the device is charging the battery. CHG
goes high impedance when the battery is fully charged.
O
System output connection. Bypass the OUT to GND with a 1 μF ceramic capacitor. Connect OUT and BAT
together.
There is an internal electrical connection between the exposed thermal pad and the GND pin of the device.
The thermal pad must be connected to the same potential as the GND pin on the printed circuit board. Do not
use the thermal pad as the primary ground input for the device. GND pin must be connected to ground at all
times.
Copyright © 2014, Texas Instruments Incorporated
Product Folder Links: bq25071
Submit Documentation Feedback
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