1 Features

1• Charge 1- to 4-Cell Battery From Wide Range of

Input Sources

– 3.5-V to 24-V Input Operating Voltage

– Supports USB2.0, USB 3.0, USB 3.1 (Type C),

and USB_PD Input Current Settings

– Seamless Transition Between Buck and Boost

Operation

– Input current and Voltage Regulation (IDPM

and VDPM) Against Source Overload

• Power/Current Monitor for CPU Throttling

– Comprehensive PROCHOT Profile, IMVP8

Compliant

– Input and Battery Current Monitor

– System Power Monitor, IMVP8 Compliant

• Narrow-VDC (NVDC) Power Path Management

– Instant-On With No Battery or Deeply

Discharged Battery

– Battery Supplements System When Adapter is

Fully-Loaded

– Ideal Diode Operation in Supplement Mode

• 800-kHz or 1.2-MHz Programmable Switching

Frequency for 1-μH to 3.3-μH Inductor

• Host Control Interface for Flexible System

Configuration

– SMBus Port for Optimal System Performance

and Status Reporting

– Hardware Pin to Set Input Current Limit

Without EC Control

• Integrated ADC to Monitor Voltage, Current and

Power

• High Accuracy Regulation and Monitor

– ±0.5% Charge Voltage Regulation

– ±2% Input/Charge Current Regulation

– ±2% Input/Charge Current Monitor

– ±5% Power Monitor

• Safety

– Thermal Shutdown

– Input, System, Battery Overvoltage Protection

– MOSFET Inductor Overcurrent Protection

• Low Battery Quiescent Current

• Input Current Optimizer (ICO) to Extract Max Input

Power

• Charge any Battery Chemistry: Li+, LiFePO4,

NiCd, NiMH, Lead Acid

• Package: 32-Pin 4 × 4 WQFN

2 Applications

• Ultra-Books, Notebooks, Detachable, and Tablet

PCs and Power Bank

• Industrial and Medical Equipment

• Portable Equipment With Rechargeable Batteries

3 Description

The bq25708 is a synchronous NVDC battery buckboost

charge controller, offering low component

count, high efficiency solution for space-constraint,

multi-chemistry battery charging applications.

The NVDC-1 configuration allows the system to be

regulated at 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.

The bq25708 charges battery from a wide range of

input sources including USB adapter, high voltage

USB PD sources and traditional adapters.