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TPS61381-Q1

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400kHz boost converter with LDO charger and battery health detection

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Data sheet

TPS61381-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Boost Switch current limit (typ) (A) 20 Vin (max) (V) 13 Vin (min) (V) 0.5 Vout (max) (V) 12 Vout (min) (V) 5 Features Adjustable current limit, Bidirectional, Enable, I2C interface, Spread Spectrum, Synchronous rectification, UVLO fixed EMI features Frequency Dithering, Spread Spectrum Control mode Peak current mode Switching frequency (min) (kHz) 400 Switching frequency (max) (kHz) 400 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 20 Duty cycle (max) (%) 90 Type Converter
Rating Automotive Topology Boost Switch current limit (typ) (A) 20 Vin (max) (V) 13 Vin (min) (V) 0.5 Vout (max) (V) 12 Vout (min) (V) 5 Features Adjustable current limit, Bidirectional, Enable, I2C interface, Spread Spectrum, Synchronous rectification, UVLO fixed EMI features Frequency Dithering, Spread Spectrum Control mode Peak current mode Switching frequency (min) (kHz) 400 Switching frequency (max) (kHz) 400 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 20 Duty cycle (max) (%) 90 Type Converter
WQFN-FCRLF (RAV) 24 12 mm² 4 x 3
  • 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
  • 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

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 for details.

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 for details.
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* Data sheet TPS61381-Q1 Automotive 400kHz, 40V, 15A Boost Converter with LDO Charger and Battery State of Health Detection datasheet PDF | HTML 24 Mar 2025
Functional safety information TPS61381-Q1, TPS61382-Q1, TPS61383-Q1, and TPS61382A-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 08 Dec 2025
Application note TPS61381-Q1 Schematic and Layout Guideline PDF | HTML 01 Dec 2025

Design & development

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Evaluation board

TPS61381QEVM-126 — TPS61381-Q1 evaluation module

The TPS61381QEVM-126 operates over a wide back up battery voltage range of 0V to 12V and main battery (VBAT port) voltage range of 0V-40V to achieve a bi-directional operation. The EVM supports an output up to 7.5A load at 3.6V BUB and 6.2V output in boost mode, and supports 50-100mA charging (...)

User guide: PDF | HTML
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Simulation model

TPS61381-Q1 PSPICE Transient Model

SLVMED1.ZIP (1274 KB) - PSpice Model
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Calculation tool

TPS61381-DESIGN-CALCULATION-TOOL — TPS61381-Q1 Calculation Tool

This calculation tool is for converter TPS61381-Q1
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  • TPS61381-Q1 — 400kHz boost converter with LDO charger and battery health detection
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WQFN-FCRLF (RAV) 24 Ultra Librarian
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