© Semiconductor Components Industries, LLC, 2009

December, 2009 − Rev. 0

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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

Compliant

Applications

http://onsemi.com

TQFN−16

HV3 SUFFIX

CASE 510AD

PIN CONNECTIONS

RT

RC

LEDA

LEDB

RF

BAL

CAP

CAP

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)