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BQ25858-Q1

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Automotive stand-alone or I²C controlled 70V bidirectional buck-boost controller

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Data sheet

BQ25858-Q1

ACTIVE
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Product details

Rating Automotive Charge current (max) (A) 20 Features AEC-Q100 Automotive Qual, Adjustable switching frequency, Bidirectional, IC thermal regulation, IINDPM (Input current limit), Input OVP, Integrated ADC, Integrated LDO, SYNC Pin, USB C/PD compatible Vin (min) (V) 4.4 Vin (max) (V) 70 Absolute max Vin (max) (V) 85 Control topology Switch-Mode Buck, Switch-Mode Buck-boost Control interface I2C Operating temperature range (°C) -40 to 150
Rating Automotive Charge current (max) (A) 20 Features AEC-Q100 Automotive Qual, Adjustable switching frequency, Bidirectional, IC thermal regulation, IINDPM (Input current limit), Input OVP, Integrated ADC, Integrated LDO, SYNC Pin, USB C/PD compatible Vin (min) (V) 4.4 Vin (max) (V) 70 Absolute max Vin (max) (V) 85 Control topology Switch-Mode Buck, Switch-Mode Buck-boost Control interface I2C Operating temperature range (°C) -40 to 150
VQFN (RRV) 36 30 mm² (6 mm × 5 mm)
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: −40ºC ≤ TA≤ 150ºC
  • Wide input voltage operating range: 4.4V to 70V with 20mV/step
  • Synchronous buck-boost DC/DC controller with NFET drivers
    • 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
    • Selectable PFM operation for light load efficiency improvement (PFM or forced PWM option)
    • Optional gate driver supply input for optimized efficiency
  • Support USB-PD Extended Power Range (EPR) in forward and reverse power direction
    • Adjustable output voltage regulation from 3.3V to 60V with 20mV/step
    • Adjustable input and output current regulation (RAC_SNS, ROUT_SNS) from 400mA to 20A with 50mA/step using 5mΩ resistor
  • Bypass mode for highest efficiency with VOUT = VAC
  • Buck-only mode
  • High accuracy
    • ±2% output voltage regulation
    • ±3% output/input current regulation
    • ±2% input voltage regulation
  • 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 overvoltage and undervoltage protection
    • Output overvoltage and overcurrent protection
    • Thermal shutdown
  • Status outputs
    • Input power present status (PG)
    • Switcher operation status (STAT)
  • Package
    • 36-pin 5mm × 6mm QFN with wettable flanks
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: −40ºC ≤ TA≤ 150ºC
  • Wide input voltage operating range: 4.4V to 70V with 20mV/step
  • Synchronous buck-boost DC/DC controller with NFET drivers
    • 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
    • Selectable PFM operation for light load efficiency improvement (PFM or forced PWM option)
    • Optional gate driver supply input for optimized efficiency
  • Support USB-PD Extended Power Range (EPR) in forward and reverse power direction
    • Adjustable output voltage regulation from 3.3V to 60V with 20mV/step
    • Adjustable input and output current regulation (RAC_SNS, ROUT_SNS) from 400mA to 20A with 50mA/step using 5mΩ resistor
  • Bypass mode for highest efficiency with VOUT = VAC
  • Buck-only mode
  • High accuracy
    • ±2% output voltage regulation
    • ±3% output/input current regulation
    • ±2% input voltage regulation
  • 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 overvoltage and undervoltage protection
    • Output overvoltage and overcurrent protection
    • Thermal shutdown
  • Status outputs
    • Input power present status (PG)
    • Switcher operation status (STAT)
  • Package
    • 36-pin 5mm × 6mm QFN with wettable flanks

BQ25858-Q1, BQ25858B-Q1 are automotive grade, wide input voltage, bidirectional switched-mode buck-boost controllers. The devices offer high-efficiency regulation over a wide voltage range with output CC-CV control. The devices integrate all the loop compensation for the buck-boost converter, thereby providing a high density solution with ease of use. In reverse mode, the devices draw power from the output supply and regulate the input terminal voltage with an added constant current loop for protection.

Besides the I2C host-controlled mode, the device also supports programmable hardware limits. Input current, and output current regulation targets can be set with single resistor on the IIN, and IOUT pins, respectively. By default, the device is programmed to provide 5V output, and the target output voltage can be adjusted via the VOUT_REG register bits.

BQ25858-Q1, BQ25858B-Q1 are automotive grade, wide input voltage, bidirectional switched-mode buck-boost controllers. The devices offer high-efficiency regulation over a wide voltage range with output CC-CV control. The devices integrate all the loop compensation for the buck-boost converter, thereby providing a high density solution with ease of use. In reverse mode, the devices draw power from the output supply and regulate the input terminal voltage with an added constant current loop for protection.

Besides the I2C host-controlled mode, the device also supports programmable hardware limits. Input current, and output current regulation targets can be set with single resistor on the IIN, and IOUT pins, respectively. By default, the device is programmed to provide 5V output, and the target output voltage can be adjusted via the VOUT_REG register bits.
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Top documentation Type Title Format options Date
* Data sheet BQ25858-Q1/858B-Q1: Automotive, I2C Controlled, Bidirectional Buck-Boost Controllers with Wide Voltage Range datasheet (Rev. A) PDF | HTML Jul 10, 2025
Certificate BQ25858EVM EU Declaration of Conformity (DoC) Feb 7, 2025

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Evaluation board

BQ25858EVM — Evaluation module for automotive and I2C controlled, 70V bidirectional buck-boost converter

The BQ25858 evaluation module (EVM) is a complete evaluation systems for the BQ25858-Q1 IC. The BQ25858EVM has a max input and output of 55V and a max output current of 10A.

The BQ25858-Q1 IC is a wide voltage, bidirectional switched-mode buck-boost controller. This device offers high-efficiency (...)

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BQ25756 design calculator is a calculation tool for BQ25756 which is a wide input voltage, switched mode buck-boost Li-Ion, Li-polymer, or LiFePO4 battery charge controller with bidirectional power flow support.
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