Driver or library
BQ25853Q1-DESIGN — BQ25853-Q1 full datasheet
BQ25853-Q1 full data sheet and other information are available by request.
BQ25853-Q1
Automotive, I2C-controlled, 70V, bidirectional buck-boost supercapacitor controller
Data sheet
BQ25853-Q1
- AEC-Q100 qualified for automotive applications
- Temperature grade 1: −40ºC ≤ TA≤ 150ºC
- Wide input voltage operating range: 4.4V to 70V
- Wide output voltage operating range: up-to 70V supercapacitor charging
- Synchronous buck-boost controller with NFET drivers
- Buck only mode configurable with MODE pin
- Adjustable fSW from 200kHz to 600kHz
- Switching frequency dithering for EMI noise reduction (DRSS)
- Optional synchronization to external clock
- Integrated loop compensation with soft start
- Optional gate driver supply input for optimized efficiency
- Bidirectional converter operation to support autonomous backup mode with no I2C interactions
- VREV_FB pin to program system voltage in reverse mode with resistor divider
- ACUV pin to program reverse mode automatic entry/exit threshold
- Adjustable output current regulation (RBAT_SNS) up to 35A using 2.5mΩ resistor
- I2C controlled for optimal system performance with resistor-programmable option
- Hardware adjustable input and output current limits
- Integrated 16-bit ADC for voltage, current, and temperature monitoring
- High safety integration
- Adjustable input over- and under-voltage protection
- Overvoltage and overcurrent protection
- Thermal shutdown
- Package
- 36-pin 5mm × 6mm QFN with wettable flanks
- Functional Safety-Capable
The BQ25853-Q1 is an automotive grade, wide input voltage, switched-mode buck-boost battery charge controller with bidirectional power flow support. The device offers high-efficiency supercapacitor charging over a wide voltage range with accurate charge current and charge voltage regulation. The device integrates all the loop compensation for the buck-boost converter, thereby providing a high density design with ease of use. In reverse mode, the device draws power from the supercapacitor and regulates the input terminal voltage with an added constant current loop for protection.
Besides the I2C host-controlled charging mode, the device also supports standalone charging mode via resistor programmable limits. Input current, charge current, charge voltage regulation, and reverse mode voltage regulation targets can be set via the ILIM_HIZ, ICHG, and FB pins, respectively.
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Technical documentation
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View all 2 | Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | BQ25853-Q1 Automotive Bidirectional Charge Controller for Backup Power datasheet | PDF | HTML | 08 Apr 2026 |
| EVM User's guide | BQ25853-Q1 Evaluation Module | PDF | HTML | 13 Mar 2026 |
Design & development
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Evaluation board
BQ25853EVM — BQ25853-Q1 evaluation module
The BQ25853EVM evaluation module (EVM) is a complete evaluation system for the BQ25853-Q1 IC, a buck-boost supercapacitor charge controller with a wide input range of 4.2V - 70V, a wide output voltage range of up to 70V, and bi-directional capabilities.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RRV) | 36 | Ultra Librarian |
Ordering & quality
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