CAT4004VP2-T3 CATALYST SEMICONDUCTOR, CAT4004VP2-T3 Datasheet - Page 8

• Manufacturer Part Number: CAT4004VP2-T3
• Description: IC, LED DRIVER, CONSTANT CURRENT, TDFN-8
• Manufacturer: CATALYST SEMICONDUCTOR

Specifications of CAT4004VP2-T3

• Led Driver Application: LCD Display Backlight, Digital Still Cameras
• No. Of Outputs: 4
• Output Current: 40mA
• Output Voltage: 3.3V
• Input Voltage: 2.4V To 5.5V
• Topology: Constant Current
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Block Diagram
Basic Operation
accurately regulate LED current in each channel
proportional to the current sourced from the RSET pin.
that can be set through the EN/DIM pin. The default gain on
The CAT4004 uses four tightly matched current sinks to
There are six different gain settings for LED brightness
V
IN
I
LED
+ GAIN
EN/DIM
RSET
VIN
0.6 V
R
SET
Figure 17. CAT4004 Functional Block Diagram
100 kW
Reference
Voltage
Interface
Serial
Undervoltage
Lockout
http://onsemi.com
Setting DAC
Register
Current
8
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.
headroom to sink constant regulated current. If the input
supply falls below 1.8 V, the under−voltage lockout circuit
disables all LED channels and resets the circuit to default
values. Any unused LED channels should be left open.
Each LED channel needs a minimum of 150 mV
4 Current Sink
Regulators
GND