CAT3604V datasheet(8/15 Pages) CATALYST

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CAT3604V

Doc. No. MD-5029, Rev. B

Characteristics subject to change without notice

PIN DESCRIPTION

Pin #

Name

Function

Device enable (active high).

Not connected inside the package.

RSET

Connect resistor RSET to set the LED current.

VOUT

Charge pump output connected to the LED anodes.

VIN

Charge pump input, connect to battery or supply.

C1+

Bucket capacitor 1 Positive terminal

C1-

Bucket capacitor 1 Negative terminal

C2-

Bucket capacitor 2 Negative terminal

C2+

Bucket capacitor 2 Positive terminal

GND

Ground Reference

LED4

LED4 cathode terminal.

LED3

LED3 cathode terminal.

LED2

LED2 cathode terminal.

LED1

LED1 cathode terminal.

TAB

GND

Connect to GND on the PCB.

PIN FUNCTION

VIN

is the supply pin for the charge pump. A small

1μF ceramic bypass capacitor is required between the

VIN pin and ground near the device. The operating

input voltage range is from 2.5V to 5.5V. Whenever

the input supply falls below the under-voltage

threshold (1.8V), all the LED channels are disabled

and the device enters shutdown mode.

is the enable input and the high resolution PWM

dimming control. Levels of logic high and logic low are

set at 1.3V and 0.4V respectively. When EN is initially

taken high, the device becomes enabled and all LED

currents are set according to the RSET resistor. To

place the device into “zero current” shutdown mode,

the EN pin must be held low for at least 1.5ms.

VOUT

is the charge pump output that is connected to

the LED anodes. A small 1μF ceramic bypass

capacitor is required between the VOUT pin and ground

near the device.

GND

is the ground reference for the charge pump. The

pin must be connected to the ground plane on the PCB.

C1+, C1-

are connected to each side of the ceramic

bucket capacitor C1.

C2+, C2-

are connected to each side of the ceramic

bucket capacitor C2.

LED1 to LED4

provide the internal regulated current

source for each of the LED cathodes. These pins

enter high-impedance zero current state whenever the

device is placed in shutdown mode. If an LED pin is

directly tied to VOUT, that channel is disabled.

TAB

is the exposed pad underneath the package. For

best thermal performance, the tab should be soldered

to the PCB and connected to the ground plane.

RSET

is connected to the resistor (RSET) to set the

current for the LEDs. The voltage at this pin regulated

to 0.6V. The ground side of the external resistor

should be star connected back to the GND of the

PCB. In shutdown mode, RSET beomes high

impedance.

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