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.