Texas Instruments TPS61381-Q1 400kHz 40V 15A Boost Converter

Texas Instruments TPS61381-Q1 400kHz 40V 15A Boost Converter is an automotive bidirectional boost converter/LDO charger with a battery state-of-health detection function designed for backup power systems like TBOX or e-call. The converter supports an absolute max voltage of up to 40V on the V_OUT pin to withstand load-dump conditions and can be directly connected to a 12V car battery. The TPS61381-Q1 integrates an I²C configurable LDO charger supporting NiMH, Li-Ion, LiFePO₄, and a supercapacitor.

TPS61381-Q1 integrates a boost function that operates over 0.5V to 12V BUB voltage and a 5V to 12V output voltage. The device applies a fixed-frequency peak current control scheme with an optional spread spectrum to minimize EMI. The boost function supports a 5A to 15A programmable average current limit.

The Texas Instruments TPS61381-Q1 integrates a battery health detection feature that discharges the battery with a constant current and detects the voltage drop across the battery's internal resistance. It is available in a 3mm × 4mm QFN package with a wettable flank. This device is typically used for emergency calls (eCall) applications.

Features

AEC-Q100 qualified for automotive applications with a device temperature grade 1 of -40°C to 125°C ambient operating temperature range
I²C programmable LDO charger
- Supports charger input voltage (V_OUT pin) up to 21V, absolute max up to 40V to withstand load dump
- Supports multi-chemistry battery charging profile of 1 to 5 cell NiMH, 1 to 2 cell Li-Ion, LiFePO₄, and 1 to 4 cell supercapacitor
- Programmable charging current 50mA and 100mA
- Wide battery voltage operating range of 0V to 12V
- Programmable charging timer up to 32h
- NTC thermistor input to monitor battery temperature
Programmable boost converter supporting a 12V car battery backup power system
- Programmable output voltage range of 5V to 12V
- Programmable boost average input current limit from 5A to 15A
- Backup battery (BUB) voltage in boost mode of 0.5V to 12V
  - Minimum 3V for start-up
  - Can start up at 1V when V_OUT > 5V
- < 20us automatic transition into the boost mode when the 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 the 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 backup battery
EMI mitigation
- 400kHz fixed switching frequency
- Optional programmable spread spectrum
3mm × 4mm 25-pin package with wettable flank