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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 Vin (max) (V) 13 Vin (min) (V) 0.5 Vout (max) (V) 12 Vout (min) (V) 5 Features Adjustable current limit, Bi-directional, Enable, I2C interface, Spread Spectrum, Synchronous Rectification, UVLO Fixed EMI features Frequency Dithering, Spread Spectrum Operating temperature range (°C) -40 to 125 Switching frequency (min) (kHz) 400 Switching frequency (max) (kHz) 400 Iq (typ) (µA) 20 Control mode current mode Duty cycle (max) (%) 90 Switch current limit (typ) (A) 20 Type Converter
Rating Automotive Topology Boost Vin (max) (V) 13 Vin (min) (V) 0.5 Vout (max) (V) 12 Vout (min) (V) 5 Features Adjustable current limit, Bi-directional, Enable, I2C interface, Spread Spectrum, Synchronous Rectification, UVLO Fixed EMI features Frequency Dithering, Spread Spectrum Operating temperature range (°C) -40 to 125 Switching frequency (min) (kHz) 400 Switching frequency (max) (kHz) 400 Iq (typ) (µA) 20 Control mode current mode Duty cycle (max) (%) 90 Switch current limit (typ) (A) 20 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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Technical documentation

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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
EVM User's guide TPS61381-Q1EVM-126 Evaluation Module User's Guide PDF | HTML 21 Mar 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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WQFN-FCRLF (RAV) 24 Ultra Librarian
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