CAT4004VP2-T3 datasheet(8/11 Pages) CATALYST

Part #	CAT4004VP2-T3

Description	4-Channel Constant Current LED Driver with EZDim?

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Manufacturer	CATALYST [Catalyst Semiconductor]

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

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CAT4004

Doc. No. MD-5024 Rev. B

8

Characteristics subject to change without notice

BLOCK DIAGRAM

4 Current Sink

Regulators

Current

Setting DAC

Undervoltage

Lockout

Register

Serial

Interface

RSET

100kΩ

EN/DIM

GND

VIN

Reference

Voltage

Figure 2. CAT4004 Functional Block Diagram

BASIC OPERATION

The CAT4004 uses four tightly matched current

sinks to accurately regulate LED current in each

channel proportional to the current sourced from the

RSET pin.

SET

LED

R

V

6

.

0

GAIN

I

×

=

There are six different gain settings for LED

brightness that can be set through the EN/DIM pin.

The default gain on power-up is 132. Tight current

regulation for all channels is possible over a wide

range of input and LED voltages due to independent

current sensing circuitry on each channel.

Each LED channel needs a minimum of 150mV

headroom to sink constant regulated current. If the

input supply falls below 1.8V, the under-voltage

lockout circuit disables all LED channels and resets

the circuit to default values. Any unused LED

channels should be left open.

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CAT4004VP2-T3 Datasheet(PDF) 8 Page - Catalyst Semiconductor

CAT4004VP2-T3 Datasheet(HTML) 8 Page - Catalyst Semiconductor

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