1 Features

• AEC-Q100 qualified for automotive applications

– Device temperature grade 1: –40°C to 125°C

ambient operating temperature range

• I2C programmable LDO charger

– Supports charger input voltage (VOUT Pin) up

to 21V, absmax up to 40V to withstand load

dump

– Supports multi-chemistry battery charging

profile of 1-5 cell NiMH, 1-2 cell Li-Ion,

LiFePO4, 1-4 cell super capacitor

– Programmable charging current 50mA and

100mA

– Wide battery voltage operating range 0V to 12V

– Programmable charging timer up to 32h

– NTC thermistor input to monitor battery

temperature

• Programmable boost converter supporting 12V car

battery back-up power system

– Programmable output voltage range: 5V to 12V

– Programmable boost average input current limit

from 5A to 15A

– Back-up battery (BUB) voltage in boost mode:

0.5V to 12V

• Minimum 3V for start up

• Can start up at 1V when Vout>5V

– <20us automatic transition into the boost mode

when 12V system voltage drops

• Backup battery State-of-Health(SOH) detection

– Adjustable discharge current from 0A to 1.5A

– Multi-signal analog output(AVI pin) of battery

voltage, discharge current and battery

temperature

• Lower quiescent current and leakage current

– 20μA quiescent current in standby mode

– < 1μA shutdown current

– < 1μA leakage current for pins connected to the

back up battery

• EMI mitigation

– 400kHz fix switching frequency

– Optional programmable spread spectrum

• 3mm × 4mm 25-pin package with wettable flank

2 Applications

• Emergency call(eCall)

3 Description

The TPS61381-Q1 is 400kHz, 40V, 15A automotive

bi-directional boost converter/ LDO charger with

battery state of health detection function designed

for back-up power systems like TBOX or e-call.

The converter supports absmax voltage up to 40V

on VOUT pin to withstand load-dump condition and

supports direct connection with 12V car battery.

The TPS61381-Q1 integrates I2C configurable LDO

charger supporting NiMH, Li-Ion, LiFePO4, super

capacitor.

TPS61381-Q1 integrates boost function that operates

over 0.5V to 12V BUB voltage and 5-12V output

voltage. The device applies fix frequency peak current

control scheme with optional spread spectrum to

minimize EMI. The boost function supports 5A-15A

programmable average current limit.

The TPS61381-Q1 integrates battery health detection

feature which discharge the battery with a constant

current and detects the voltage drop across the

battery internal resistance.

The TPS61381-Q1 is available in a 3mm × 4mm

QFN package with wettable flank. Care must be taken

when designing the PCB with TPS61381-Q1, view

Section 8.4.2 for details.