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© Semiconductor Components Industries, LLC, 2009
December, 2009 − Rev. 0
1 Publication Order Number:
CAT3224/D
CAT3224
4 Amp Supercapacitor
Flash LED Driver
Description
The CAT3224 is a very high−current integrated flash LED driver
which also supports the charging function for a dual−cell
supercapacitor applications. Ideal for Li−ion battery−powered
systems, it delivers up to 4 A LED flash pulses, far beyond the peak
current capability of the battery.
Dual−mode 1x/2x charge pump charges the stacked supercapacitor
to a nominal voltage of 5.4 V, while an active balance control circuit
ensures that both capacitor cell voltages remain matched. The nominal
charging current to be drawn from the battery is set by an external
resistor tied to the RC pin.
The driver also features two matched current sources. External
resistors provide the adjustment for the maximum flash mode current
(up to 4 A) and the torch mode current (up to 400 mA). A built−in
safety timer automatically terminates the flash pulse beyond a
maximum duration of 300 ms.
In addition to thermal shutdown and overvoltage protection, the
device is fully protected against external resistor programming faults
and fully supports reverse output voltage for all conditions.
The device is packaged in the tiny 16−pad TQFN 3 mm x 3 mm
package with a max height of 0.8 mm.
Features
• 2 Channels at 2 A Each in Flash Mode
• 2 Channels at 200 mA Each in Torch Mode
• Adjustable Charge Current Limit up to 1000 mA
• Flash/Torch Current Separate Adjustment
• Dual−mode 1x/2x Charge Pump
• Dual Cell Supercapacitor Balancing
• Flash Safety Timer and Ready Flag
• Supercapacitor Continuous Charging
• Shutdown CAP Leakage 3 mA
• “Zero” Current Shutdown Mode
• 80 mA Standby Current (I
VIN
)
• Over−voltage, Over−current Limiting
• Thermal Shutdown Protection
• Small 3 mm x 3 mm, 16−pad TQFN Package
• This Device is Pb−Free, Halogen Free/BFR Free and RoHS
Compliant
Applications
• High Power LED Flash
• Systems with High Peak Loads
http://onsemi.com
TQFN−16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
GND
CN
CP
VIN
RT
RC
LEDA
LEDB
RF
BAL
CAP
CAP
CHRG
FLASH
TORCH
FLAG
JAAT
MARKING DIAGRAM
Device Package Shipping
ORDERING INFORMATION
CAT3224HV3−GT2 TQFN−16
(Pb−Free)
2,000/
Tape & Reel
JAAT = Specific Device Code
1
(Top View)
Note: NiPdAu Plated Finish (RoHS−compliant)
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