Texas Instruments TPS61382A-Q1 Boost Converter
Texas Instruments TPS61382A-Q1 Boost Converter is an automotive bidirectional boost converter with an integrated buck/LDO charger and battery state-of-health detection. The device is developed for backup-power systems such as telematics boxes and emergency-call designs that require direct connection to a 12V car battery and protection against load-dump conditions.
The TPS61382A-Q1 integrates an I2C-configurable charger that supports NiMH, Li-Ion, and LiFePO4 battery chemistries. The TI TPS61382A-Q1 Boost Converter also includes a programmable boost converter for 12V backup systems, automatic transition into boost mode when the 12V system voltage drops, and battery state-of-health detection that discharges the battery with constant current to detect a voltage drop across the internal resistance.
The device is designed for emergency call (eCall) applications that require automotive backup power, battery charging, battery temperature monitoring, and diagnostic feedback. The TPS61382A-Q1 uses fixed-frequency peak-current-mode control with optional spread-spectrum for EMI reduction and is offered in a wettable-flank WQFN package.
Features
- TPS61382A-Q1 AEC-Q100 qualified for automotive applications with device temperature Grade 1 ambient operating temperature range of -40°C to +125°C
- Functional Safety-Capable device with documentation available to aid functional safety system design
- I2C-programmable buck/LDO charger for multi-chemistry backup battery charging
- Programmable boost converter for 12V car battery backup power systems
- NTC thermistor input for battery temperature monitoring
- Automatic transition into boost mode when the 12V system voltage drops
- Backup battery state-of-health detection through constant-current battery discharge and internal-resistance voltage-drop sensing
- Multi-signal analog output for battery voltage, discharge current, and battery temperature reporting
- Optional spread spectrum and frequency dithering for EMI mitigation
Specifications
- Buck/boost topology with peak-current-mode control
- Charger input voltage support of up to 20V on the VOUT pin, with 40V absolute maximum value
- Supported battery charging profiles
- 1-cell to 5-cell NiMH
- 1-cell to 2-cell Li-Ion and LiFePO4
- Battery voltage operating range of 0V to 12V
- Programmable charge current of up to 500mA
- Programmable output voltage range of 5V to 12V
- Programmable boost average input current limit range of 5A to 15A
- Backup battery voltage range in boost mode is 0.5V to 12V
- Adjustable state-of-health discharge current range of 0A to 1.5A
- Programmable charging timer of up to 32h
- Boost startup support
- Minimum 3V for startup
- Startup at 1V when VOUT > 5V
- Low-current operation
- 20μA quiescent current in standby mode
- Less than 1μA shutdown current
- Less than 1μA leakage current for pins connected to the backup battery
- Fixed switching frequency of 2.2MHz
- Maximum duty cycle of 90%
- Package
- RAV WQFN-FCRLF, 24-pin package with wettable flank
- Package size of 4mm x 3mm
Associated Converters
Texas Instruments TPS61382-Q1 400kHz 40V 15A Boost Converter
A bi-directional boost converter/buck charger with a battery state-of-health detection function.
Typical Application Circuit
Functional Block Diagram
