CAT3604 datasheet(4/11 Pages) CATALYST

Part #	CAT3604

Description	4-Channel Regulated Charge Pump White LED Driver

PDF	11 Pages

Scroll/Zoom	100%

Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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4 / 11 page

CAT3604

Doc. No. 5008, Rev. I

Characteristics subject to change without notice

Current

Setting

1.2V Ref

1MHz

Oscillator

Mode Control

1x mode (LDO)

1.5x Charge Pump

VIN

CIN

3<VIN<4.2V

Battery

RSET

CTR0

CTR1

CTR2

LED1

LED2

LED3

LED4

LED

Output

Select

4 Current

Sink Regulators

COUT

20mA

VOUT

C1-

C2-

C1+

C2+

BLOCK DIAGRAM

BASIC OPERATION

At power-up, the CAT3604 starts operation in 1x

mode. If it is able to drive the programmed LED

current, it continues in 1x mode. If the battery

voltage drops to a level where the LED current

cannot be met, the driver automatically switches

into 1.5x mode. The 1.5x charge pump will boost

the output voltage accordingly to achieve the nomi-

nal LED current.

Figure 1: CAT3604 Functional Block Diagram

The operating mode is reinitialized each and every

time the chip is powered up or is taken out of

shutdown mode (via EN pin). The use of the control

pins (CTR0, CTR1, CTR2) does not reconfigure the

mode of operation.

CAT3604 Datasheet(PDF) 4 Page - Catalyst Semiconductor

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