IC thermal regulation, ICO (Input Current Optimization), IINDPM (Input current limit), Input OVP, Integrated ADC, Power Path, USB C/PD compatible, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power)

Vin (min) (V)

0

Vin (max) (V)

40

Absolute max Vin (max) (V)

45

Control topology

Switch-Mode Buck-boost

Battery charge voltage (min) (V)

0

Battery charge voltage (max) (V)

23

Control interface

SMBus

Operating temperature range (°C)

-40 to 125

Rating

Catalog

Number of series cells

2, 3, 4, 5

Cell chemistry

Li-Ion/Li-Polymer, LiFePO4, Lithium Phosphate/LiFePO4

Charge current (max) (A)

16.2

Features

IC thermal regulation, ICO (Input Current Optimization), IINDPM (Input current limit), Input OVP, Integrated ADC, Power Path, USB C/PD compatible, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power)

Vin (min) (V)

0

Vin (max) (V)

40

Absolute max Vin (max) (V)

45

Control topology

Switch-Mode Buck-boost

Battery charge voltage (min) (V)

0

Battery charge voltage (max) (V)

23

Control interface

SMBus

Operating temperature range (°C)

-40 to 125

WQFN (REE)

36

20 mm² 4 x 5

TI patented quasi dual phase buck-boost narrow voltage DC (NVDC) charger for USB-C Extended Power Range (EPR) interface platform
- 3.5V to 40V input range to charge 2cell to 5cell battery
- Charge current up to 16.3A or 30A based on 5mΩ/2mΩ sensing resistor
- Input current limit up to 8.2A/16.4A based on 10mΩ/5mΩ sensing resistor
- Support USB 2.0, USB 3.0, USB 3.1, USB 3.2, USB-C power delivery and extended power range input current setting
- Input Current Optimizer (ICO) to extract max input power without overloading the adapter
- Integrated Fast Role Swap (FRS) feature following USB-PD specification
- Seamless transition between quasi dual phase buck, buck-boost, and boost operations
- Single phase buck-boost flexibility through MODE pin configuration
- Input current and voltage regulation (IINDPM and VINDPM) against source overload
- Battery supplements system when adapter is fully loaded
TI-patented dual random spread spectrum (DRSS) for meeting IEC-CISPR 32 EMI specification
TI-patented Pass Through Mode (PTM) for >99% efficiency and battery fast charging support
IMVP8/IMVP9 compliant system features for Intel platform
- Enhanced Vmin Active Protection (VAP) mode supplements battery from input capacitors during system peak power spike following latest Intel specification
- Comprehensive PROCHOT profile
- Two level discharge current limit PROCHOT profile to avoid battery wear out
- System power monitor (PSYS)
Input and battery current monitor through dedicated pins
Integrated 16-bit ADC to monitor voltage, current and power
Battery MOSFET ideal diode operation in supplement mode
Power up USB port from battery (USB OTG)
- 3V to 38V OTG
- Output current limit up to 8.2A based on 10mΩ sensing resistor
600kHz or 800kHz programmable switching frequency with 2.2µH or 1.5µH inductor
SMBus host control interface for flexible system configuration
High accuracy for the regulation and monitor
- ±0.5% Charge voltage regulation
- ±2.5% Charge current regulation
- ±2% Input current regulation
- ±2% Input/charge current monitor
Safety
- Thermal regulation and thermal shutdown
- Input, system, battery overvoltage protection
- Input, MOSFET, inductor overcurrent protection
Package: 36-Pins 4.0mm × 5.0mm WQFN

TI patented quasi dual phase buck-boost narrow voltage DC (NVDC) charger for USB-C Extended Power Range (EPR) interface platform
- 3.5V to 40V input range to charge 2cell to 5cell battery
- Charge current up to 16.3A or 30A based on 5mΩ/2mΩ sensing resistor
- Input current limit up to 8.2A/16.4A based on 10mΩ/5mΩ sensing resistor
- Support USB 2.0, USB 3.0, USB 3.1, USB 3.2, USB-C power delivery and extended power range input current setting
- Input Current Optimizer (ICO) to extract max input power without overloading the adapter
- Integrated Fast Role Swap (FRS) feature following USB-PD specification
- Seamless transition between quasi dual phase buck, buck-boost, and boost operations
- Single phase buck-boost flexibility through MODE pin configuration
- Input current and voltage regulation (IINDPM and VINDPM) against source overload
- Battery supplements system when adapter is fully loaded
TI-patented dual random spread spectrum (DRSS) for meeting IEC-CISPR 32 EMI specification
TI-patented Pass Through Mode (PTM) for >99% efficiency and battery fast charging support
IMVP8/IMVP9 compliant system features for Intel platform
- Enhanced Vmin Active Protection (VAP) mode supplements battery from input capacitors during system peak power spike following latest Intel specification
- Comprehensive PROCHOT profile
- Two level discharge current limit PROCHOT profile to avoid battery wear out
- System power monitor (PSYS)
Input and battery current monitor through dedicated pins
Integrated 16-bit ADC to monitor voltage, current and power
Battery MOSFET ideal diode operation in supplement mode
Power up USB port from battery (USB OTG)
- 3V to 38V OTG
- Output current limit up to 8.2A based on 10mΩ sensing resistor
600kHz or 800kHz programmable switching frequency with 2.2µH or 1.5µH inductor
SMBus host control interface for flexible system configuration
High accuracy for the regulation and monitor
- ±0.5% Charge voltage regulation
- ±2.5% Charge current regulation
- ±2% Input current regulation
- ±2% Input/charge current monitor
Safety
- Thermal regulation and thermal shutdown
- Input, system, battery overvoltage protection
- Input, MOSFET, inductor overcurrent protection
Package: 36-Pins 4.0mm × 5.0mm WQFN

The BQ25785 is a synchronous NVDC buck-boost battery charge controller to charge a 2cell to 5cell battery from a wide range of input sources including USB adapter, extended power range (EPR) USB-C Power Delivery (PD) sources, standard power range (SPR) USB-C Power Delivery (PD) sources and traditional adapters. The device offers a low component count, high efficiency design for space-constrained, 2cell to 5cell battery charging applications.

The NVDC configuration allows the system to be regulated based on battery voltage, but not drop below system minimum voltage. The system keeps operating even when the battery is completely discharged or removed. When load power exceeds input source rating, the battery goes into supplement mode and prevents the system from crashing.

During power up, the charger sets the converter to a buck, boost, or buck-boost configuration based on the input source and battery conditions. The charger seamlessly transits between the buck, boost, and buck-boost operation modes without host control. The TI-patented quasi-dual phase converter can interleave dual phase under high power buck mode helping thermal distribution and reduce each inductor size. Simultaneously, the device only needs two boost side switching MOSFETs to save overall system area and cost due to limited power operation under boost mode.

In the absence of an input source, the BQ25785 supports the USB On-the-Go (OTG) function.

When only a battery powers the system and no external load is connected to the USB OTG port, the BQ25785 implements the latest Intel Vmin Active Protection (VAP) feature, in which the device charges up the VBUS voltage from the battery to store some energy in the input decoupling capacitors. During a system peak power spike, the energy stored in the input capacitors supplements the system, to prevent the system voltage from dropping below the minimum system voltage and causing a system crash.

The BQ25785 monitors adapter current, battery current, and system power. The flexibly programmable PROCHOT output goes directly to the CPU for throttling back when needed.

The latest version of the USB-C PD specification includes Fast Role Swap (FRS) to provide power role swapping occurs in a timely fashion so that the devices connected to the dock can avoid experiencing momentary power loss or glitching. This device integrates FRS in compliance with the PD specification.

TI-patented switching frequency dithering pattern can significantly reduce EMI noise over the whole conductive EMI frequency range (150kHz to 30MHz). Multiple dithering scale options are available and provide flexibility for different applications. The dithering feature greatly simplify EMI noise filter design.

The charger operates with the TI-patented Pass Through Mode (PTM) to improve efficiency over the full load range. In PTM, input power directly pass through the charger to the system. Switching losses of the MOSFETs and inductor core loss can be saved thus achieving high efficiency operation.

The BQ25785 is available in a 36-pin 4mm × 5mm WQFN package.