BQ24640 (ACTIVE)

High Efficiency Synchronous Switch-Mode Battery Charge Controller for Super Capacitor

 

Description

The bq24640 device is a highly integrated switched-mode super capacitor charge controller. The device offers a constant-frequency synchronous PWM controller with high accuracy charge current, voltage regulation, and charge status monitoring.

The bq24640 charges a super capacitor in two phases: constant current and constant voltage (CC/CV). The device can charge super capacitors from 0 V with current set on the ISET pin. When the super capacitor voltage reaches the programmed target voltage, charge current begins tapering down.

The bq24640 enters a low-current sleep mode
(<15 µA) when the input voltage falls below the output capacitor voltage.

The bq24640 has an input CE pin to enable and disable charge, and the STAT and PG output pins report charge and adapter status. The TS pin on the bq24640 monitors the temperature of the capacitor and suspends charge during hot and cold conditions.

Features

  • Charge Super Capacitor Pack From 2.1 V to 26 V
  • CC/CV Charge Profile From 0 V Without
    Precharge
  • 600-kHz NMOS-NMOS Synchronous Buck
    Controller
  • Over 90% Efficiency for up to 10-A Charge
    Current
  • 5-V to 28-V VCC Input Voltage Range
  • Accuracy
    • ±0.5% Charge Voltage Regulation
    • ±3% Charge Current Regulation
  • High Integration
    • Internal Loop Compensation
    • Internal Digital Soft Start
  • Safety
    • Input Overvoltage Protection
    • Capacitor Temperature Sensing Hot and Cold
      Charge Suspend
    • Thermal Shutdown
  • Status Outputs
    • Adapter Present
    • Charger Operation Status
  • Charge Enable Pin
  • 30-ns Driver Dead Time and 99.5% Maximum
    Effective Duty Cycle
  • Automatic Sleep Mode for Low Power
    Consumption
    • <15-µA Off-State Super Capacitor Discharge
      Current
    • <1.5-mA Off-State Input Quiescent Current
  • APPLICATIONS
    • Memory Backup Systems
    • Industrial UPS Systems and Power Transient Buffering
    • Bridge Power to Buffer the Battery

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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)
Features
Charge Current (Max) (A)
Control Interface
Control Topology
Rating
Operating Temperature Range (C)
Pin/Package
Operating Vin (Min) (V)
Operating Vin (Max) (V)
Absolute Vin (safety rating) (Max) ((V))
BQ24640 BQ24600 BQ24610 BQ24616 BQ24617 BQ24618 BQ24620 BQ24630
1
2
3
4
5
6
7
8   
1
2
3
4
5
6   
1
2
3
4
5
6   
1
2
3
4
5
6   
1
2
3
4
5   
1
2
3
4
5
6   
1
2
3
4
5
6
7   
1
2
3
4
5
6
7   
Charger    Charger    Charger    Charger    Charger    Charger    Charger    Charger   
SuperCap    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Lithium phosphate    Lithium phosphate   
2.1    2.1    2.1    2.1    2.1    2.1    1.8    1.8   
26    26    26    26    22    26    26    26   
Temp Monitoring (Thermistor Pin)    Power Path
Temp Monitoring (Thermistor Pin)   
Power Path
Standard BAT Temp Monitoring   
JEITA BAT Temp Monitoring (Thermistor Pin)
Power Path   
Power Path
Standard BAT Temp Monitoring   
Power Path
Standard BAT Temp Monitoring   
Temp Monitoring (Thermistor Pin)    Temp Monitoring (Thermistor Pin)   
10    10    10    10    10    10    10    10   
Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)    Standalone (RC-Settable)   
Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck    Switch-Mode Buck   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
-40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85   
16VQFN    16VQFN    24VQFN    24VQFN    24VQFN    24VQFN    16VQFN    24VQFN   
5    5    5    5    5    4.7    5    5   
28    28    28    28    24    28    28    28   
33    33    33    33    33    33    33    33   
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