bq25071 Charger Datasheet

bq25071 Datasheet, PDF, Equivalent


Part Number

bq25071

Description

Battery Charger

Manufacture

etcTI

Total Page 28 Pages
Datasheet
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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.

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


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community bq25071 SLUSBK6 – JULY 201 4 bq25071 1-A, Single-Input, Single-Cel l LiFePO4 Linear Battery Charger with 5 0 mA LDO 1 Features •1 Single Cell L iFePO4 Charging Algorithm • 30V Input Rating, With 10.5 V Overvoltage Protec tion (OVP) • 50mA Integrated Low Drop out Linear Regulator (LDO) • Programm able Charge Current Through ISET and EN Terminals • 7% Charge Current Regula tion Accuracy • Thermal Regulation an d Protection • Soft-Start Feature to Reduce Inrush Current • Battery NTC M onitoring • Charging Status Indicatio n 2 Applications • Smart Phones • M obile Phones • Portable Media Players • Low Power Handheld Devices 3 Desc ription The bq25071 is a highly integra ted, linear, LiFePO4 battery charger ta rgeted at space-limited portable applic ations. It accepts power from either a USB port or AC adapter and charges a si ngle-cell LiFePO4 battery with up to 1 A of charge current. The 30 V input rating with 10.5.
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