CAT4004 Datasheet, PDF (1/10 Pages) Catalyst Semiconductor – 4-Channel Constant Current LED Driver with EZDi TM

CAT4004
4-Channel Constant Current
LED Driver with EZDimt
Description
The CAT4004 provides four matched low dropout current sources to
drive LEDs. An external resistor on RSET sets the current in the LED
channels. Each LED channel includes an individual control loop
allowing the device to handle a wide range of LED forward voltages
while still maintaining tight current matching.
The EN/DIM logic inputs supports device enable and a digital
dimming interface for current setting of all LEDs. Six different current
dimming ratios are available.
The device is aimed at “direct drive” battery applications. It is
required that the battery or voltage source have enough headroom to
drive the LED forward voltage and current sink (>150 mV).
The device is available in a tiny 8−lead TDFN 2 mm x 3 mm
package with a max height of 0.8 mm.
Features
• Four LED Current Sinks with Tight Matching
• Low Dropout Driver 130 mV at 30 mA
• No Switching Noise
• Shutdown Current < 1 mA
• LED Current set by External Resistor
• Dimming via 1−wire EZDimt Interface
• Thermal Shutdown Protection
• 8−lead 2 mm x 3 mm TDFN Package
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• LCD Display Backlight
• Cellular Phones
• Digital Still Cameras
• Handheld Devices
V_IN
2.4 V
to
5.5 V
C_IN
1 mF
One wire
programming
RSET
3.8 kW
20 mA
LED1 LED2 LED3 LED4
VIN
EN/DIM
RSET
CAT4004
GND
Figure 1. Typical Application Circuit
http://onsemi.com
TDFN−8
VP2 SUFFIX
CASE 511AK
PIN CONNECTIONS
EN/DIM
GND
LED1
LED2
1
(Top View)
VIN
RSET
LED4
LED3
MARKING DIAGRAMS
FXA
XXX
YM
HAA
XXX
YM
FX = CAT4004VP2−T3
HA = CAT4004VP2−GT3
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
ORDERING INFORMATION
Device
CAT4004VP2−T3
(Note 1)
Package
TDFN−8
(Pb−Free)
Shipping
3,000/
Tape & Reel
CAT4004VP2−GT3 TDFN−8
3,000/
(Note 2)
(Pb−Free) Tape & Reel
1. Matte−Tin Plated Finish (RoHS−compliant).
2. NiPdAu Plated Finish (RoHS−compliant).
© Semiconductor Components Industries, LLC, 2010
1
March, 2010 − Rev. 2
Publication Order Number:
CAT4004/D