Calculation tool
TPS61381-DESIGN-CALCULATION-TOOL — TPS61381-Q1 Calculation Tool
This calculation tool is for converter TPS61381-Q1
Data sheet
TPS61381-Q1
- 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.
Technical documentation
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View all 3 | Type | Title | Date | ||
|---|---|---|---|---|
| * | 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
For additional terms or required resources, click any title below to view the detail page where available.
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 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WQFN-FCRLF (RAV) | 24 | Ultra Librarian |
Ordering & quality
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- MSL rating/Peak reflow
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Information included:
- Fab location
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