CAT3224HV3-GT2 Datasheet, PDF (1/14 Pages) ON Semiconductor – 4 Amp Supercapacitor Flash LED Driver

4 Amp Supercapacitor Flash LED Driver
CAT3224
FEATURES
„ 2 Channels at 2A each in Flash Mode
„ 2 Channels at 200mA each in Torch Mode
„ Adjustable charge current limit up to 1000mA
„ 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 3µA
„ “Zero” current shutdown mode
„ 80µA Standby Current (I_VIN)
„ Over-voltage, Over-current Limiting
„ Thermal Shutdown Protection
„ Small 3mm x 3mm, 16-pad TQFN package
APPLICATION
„ High power LED flash
„ Systems with high peak loads
ORDERING INFORMATION
Part
Number
Package
Package
Marking
CAT3224HV3-GT2 TQFN-16 3 x 3mm⁽¹⁾ JAAT
Note: (1) NiPdAu Plated Finish (RoHS-compliant)
PIN CONFIGURATION
TQFN 16-Pad
(Top View)
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 4A
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 5.4V, 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 4A) and the torch
mode current (up to 400mA). A built-in safety timer
automatically terminates the flash pulse beyond a
maximum duration of 300ms.
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
3mm x 3mm package with a max height of 0.8mm.
TYPICAL APPLICATION CIRCUIT
16 15 14 13
RF 1
BAL 2
CAP 3
CAP 4
12 RT
11 RC
10 LEDA
9 LEDB
5678
© 2009 SCILLC. All rights reserved.
1
Characteristics subject to change without notice
Doc. No. MD-5043, Rev. A