CAT3603 Datasheet, PDF (1/11 Pages) Catalyst Semiconductor – 3-Channel LED Driver in 3x3mm Package

CAT3603
3-Channel LED Driver in
3 x 3 mm Package
Description
The CAT3603 is a charge pump LED driver operating in either 1x
(LDO) mode or 1.5x fractional mode regulating current through each
of the 3 LED pins. Operation at a constant switching frequency of
1 MHz allows the use of very small value ceramic capacitors.
The CAT3603 drives 3 white LEDs in parallel and provides tightly
matched regulated current to achieve uniform brightness in LCD
backlighting applications. An external resistor, RSET, controls the
output current level. The device can deliver up to 30 mA over an input
voltage supply range from 3 V to 5.5 V, making it ideal for battery−
powered applications.
LED dimming can be accomplished using several methods; using a
DC voltage to set the RSET pin current, applying a PWM signal on the
EN pin, or adding a switched resistor in parallel with RSET. The EN
input pin allows the device to be placed in power−down mode with
“near−zero” quiescent current.
The device is available in the tiny 12−lead thin DFN 3 mm x 3 mm
package with a max height of 0.8 mm.
Features
• Drives up to 3 LEDs
• Current Setting Resistor
• Compatible with Supply Voltage of 3 V to 5.5 V
• Power Efficiency up to 91%
• Output Current up to 30 mA per LED
• Fractional Pump 1x/1.5x
• Low Noise Input Ripple
• Fixed High Frequency Operation 1 MHz
• “Zero” Current Shutdown Mode
• Soft Start and Current Limiting
• Short Circuit Protection
• 12−lead TDFN 3 mm x 3 mm Package
• This Device is Pb−Free, Halogen Free/BFR Free and RoHS
Compliant
Applications
• LCD Display Backlight
• Cellular Phones
• Digital Still Cameras
• Handheld Devices
http://onsemi.com
TDFN−12
HV2 SUFFIX
CASE 511AN
PIN CONNECTIONS
1
LED1
LED2
LED3
RSET
EN
VOUT
GND
C2+
C2−
C1−
C1+
VIN
(Top View)
MARKING DIAGRAM
HABB
HABB = CAT3603 Device Code
ORDERING INFORMATION
Device
Package
CAT3603HV2
TDFN−12
(Pb−Free)
Green*
* Lead Finish Matte−Tin
Shipping
2,000/Tape & Reel
© Semiconductor Components Industries, LLC, 2010
1
January, 2010 − Rev. 5
Publication Order Number:
CAT3603/D