BQ24650 (ACTIVE)

High Efficiency Synchronous Switch-Mode Charger Controller – Solar Battery Charger

 

Description

The bq24650 device is a highly integrated switch-mode battery charge controller. It provides input voltage regulation, which reduces charge current when input voltage falls below a programmed level. When the input is powered by a solar panel, the input regulation loop lowers the charge current so that the solar panel can provide maximum power output.

The bq24650 offers a constant-frequency synchronous PWM controller with high accuracy current and voltage regulation, charge preconditioning, charge termination, and charge status monitoring.

The bq24650 charges the battery in three phases: pre-conditioning, constant current, and constant voltage. Charge is terminated when the current reaches 1/10 of the fast charge rate. The pre-charge timer is fixed at 30 minutes. The bq24650 automatically restarts the charge cycle if the battery voltage falls below an internal threshold and enters a low quiescent current sleep mode when the input voltage falls below the battery voltage.

The bq24650 supports a battery from 2.1 V to 26 V with VFB set to a 2.1-V feedback reference. The charge current is programmed by selecting an appropriate sense resistor. The bq24650 is available in a 16 -pin, 3.5 mm × 3.5 mm2 thin QFN package.

Features

  • Maximum Power Point Tracking (MPPT)
    Capability by Input Voltage Regulation
  • Programmable MPPT Setting
  • 5-V to 28-V Input Solar Panel
  • 600-kHz NMOS-NMOS Synchronous Buck
    Controller
  • Resistor Programmable Float Voltage
  • Accommodates Li-Ion/Polymer, LiFePO4, Lead Acid Chemistries
  • Accuracy
    • ±0.5% Charge Voltage Regulation
    • ±3% Charge Current Regulation
    • ±0.6% Input Voltage Regulation
  • High Integration
    • Internal Loop Compensation
    • Internal Digital Soft Start
  • Safety
    • Input Overvoltage Protection
    • Battery Temperature-Sensing
    • Battery Absent Detection
    • Thermal Shutdown
  • Charge Status Outputs for LED or Host Processor
  • Charge Enable on MPPSET Pin
  • Automatic Sleep Mode for Low Power
    Consumption
    • < 15-µA OFF-State Battery Discharge Current
  • Small 3.5 × 3.5 mm2 16-Pin QFN Package

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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
USB Feature
Rating
Operating Temperature Range (C)
Pin/Package
Operating Vin (Min) (V)
Operating Vin (Max) (V)
Absolute Vin (safety rating) (Max) ((V))
BQ24650
1
2
3
4
5
6   
Charger   
Lead Acid
Li-Ion/Li-Polymer
LiFePO4   
2.1   
26   
Programmable MPPT Setting
Solar Input
Standard BAT Temp Monitoring
Vin DPM (OK for Solar Power Source)   
10   
Standalone (RC-Settable)   
N/A   
Catalog   
-40 to 85   
16VQFN   
5   
28   
33