NVDC I2C Battery Buck-Boost Charge Controller with System Power Monitor & Processor - BQ25703A

BQ25703A (ACTIVE)

NVDC I2C Battery Buck-Boost Charge Controller with System Power Monitor & Processor

 

Description

The bq25703A is a synchronous NVDC battery buck-boost 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 input source from being overloaded.

The bq25703A charges battery from a wide range of input sources including USB adapter, high voltage USB PD sources and traditional adapters.

During power up, the charger sets converter to buck, boost or buck-boost configuration based on input source and battery conditions. The charger automatically transits among buck, boost and buck-boost configuration without host control.

In the absence of an input source, the bq25703A supports On-the-Go (OTG) function from 1- to 4-cell battery to generate 4.48 V to 20.8 V on VBUS. During OTG mode, the charger regulates output voltage and output current.

The bq25703A monitors adapter current, battery current and system power. The flexibly programmed PROCHOT output goes directly to CPU for throttle back when needed.

Features

  • 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
  • Power Up USB Port From Battery (USB OTG)
    • Output 4.48-V to 20.8-V Compatible With USB PD
    • Output Current Limit up to 6.35 A
  • 800-kHz or 1.2-MHz Programmable Switching Frequency for 1-µH to 2.2-µH Low Profile Inductor
  • Host Control Interface for Flexible System Configuration
    • I2C (bq25703A) Port for Optimal System Performance and Status Reporting
    • Hardware Pin to Set Input Current Limit Without EC Control
  • 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

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Parametrics Compare all products in Battery Charger IC

 
Number of Series Cells
Function
Cell Chemistry
Battery Charge Voltage (Min) (V)
Battery Charge Voltage (Max) (V)
Special Features
Charge Current (Max) (A)
Control Interface
Control Topology
USB Feature
Rating
Operating Temperature Range (C)
Pin/Package
Operating Vin (Min) (V)
Operating Vin (Max) (V)
Absolute Vin (safety rating) (Max) ((V))
BQ25703A BQ24780S BQ25700A
1
2
3
4   
1
2
3
4   
1
2
3
4   
Charger    Charger    Charger   
Lead Acid
Li-Ion/Li-Polymer
LiFePO4
Lithium phosphate
NiCd
NiMH
SuperCap   
Lead Acid
Li-Ion/Li-Polymer
LiFePO4
NiCd
NiMH   
Lead Acid
Li-Ion/Li-Polymer
LiFePO4
Lithium phosphate
NiCd
NiMH
SuperCap   
1.024    1.024    1.024   
19.2    19.2    19.2   
1-4 Cells
Integrated ADC
OTG (On The Go Boost)
Over Voltage Protection
Power Path
Solar Input
Standard BAT Temp Monitoring
Thermal Regulation
Under Voltage Protection
Vin DPM (OK for Solar Power Source)   
1-4 Cells
Over Voltage Protection
Power Path
Thermal Regulation
Under Voltage Protection
Vin DPM (OK for Solar Power Source)   
1-4 Cells
Integrated ADC
OTG (On The Go Boost)
Over Voltage Protection
Power Path
Solar Input
Standard BAT Temp Monitoring
Thermal Regulation
Under Voltage Protection
Vin DPM (OK for Solar Power Source)   
8.128    8.128    8.128   
I2C    SMBus    SMBus   
Switch-Mode Buck-boost    Switch-Mode Buck    Switch-Mode Buck-boost   
USB OTG
USB Source
USB-Friendly   
N/A    USB OTG
USB Source
USB-Friendly   
Catalog    Catalog    Catalog   
-40 to 85    -40 to 85    -40 to 85   
32QFN    28WQFN    32QFN   
3.5    4.5    3.5   
24    24    24   
30    30    30   

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WEBENCH® Designer BQ25703A

Battery Specifications:
Chemistry Lithium Ion/Lithium Polymer
  Series Parallel
Cell Count
Cell Capacity  mAh  
Total Capacity mAh  
Charger Specifications:
  Min   Max Range
Vin  V 3.50 to 24.00V
Iin  A ≤ 6.35A
Vchg  V 1.024 to 19.2V
Ichg  A ≤ 8.128A
Ambient Temp  °C -40 to 85°C