1 Features

1• Qualified for Automotive Applications

• AEC-Q100 Qualified With the Following Results:

– Device Temperature Grade 1: -40°C to 125°C

Ambient Operating Temperature Range

– Device HBM ESD Classification Level H2

– Device CDM ESD Classification Level C5

• Single Cell LiFePO4 Charging Algorithm

• 30-V Input Rating, With 10.5-V Overvoltage

Protection (OVP)

• 50-mA Integrated Low Dropout Linear Regulator

(LDO)

• Programmable Charge Current Through ISET and

EN Terminals

• Thermal Regulation and Protection

• Soft-Start Feature to Reduce Inrush Current

• Battery NTC Monitoring

• Charging Status Indication

• 10-Pin SON (2mm x 3mm) Package with Wettable

Flanks

2 Applications

• E-call for Cars

• Automotive Telematics

• Vehicle GPS Tracking

• Car Network Video Recorder

• Smart Key

• Automotive Entertainment backup battery

3 Description

The bq25071-Q1 is a highly integrated, linear,

LiFePO4 battery charger targeted at space-limited

automotive 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 supports low-cost unregulated

adapters.

The bq25071-Q1 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.