CAT3603HV2 Datasheet, PDF (1/12 Pages) ON Semiconductor – 3-Channel LED Driver in 3 x 3mm Package

CAT3603
3-Channel LED Driver in 3 x 3mm Package
FEATURES
„ Drives up to 3 LEDs
„ Current setting resistor
„ Compatible with supply voltage of 3V to 5.5V
„ Power efficiency up to 91%
„ Output Current up to 30mA per LED
„ Fractional pump 1x/1.5x
„ Low noise input ripple
„ Fixed High Frequency Operation 1MHz
„ “Zero” Current Shutdown Mode
„ Soft start and current limiting
„ Short circuit protection
„ 12-lead TDFN 3mm x 3mm package
APPLICATION
„ LCD Display Backlight
„ Cellular Phones
„ Digital Still Cameras
„ Handheld Devices
ORDERING INFORMATION
Part
Number
Quantity
Package per Reel
CAT3603HV2 TDFN-12 3x3 2,000
Green*
* Lead Finish Matte-Tin
Package
Marking
HABB
For Ordering Information details, see page 11.
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
1MHz 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 30mA over
an input voltage supply range from 3V to 5.5V,
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
3mm x 3mm package with a max height of 0.8mm.
PIN CONFIGURATION
12-lead TDFN 3mm (Top view)
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
TYPICAL APPLICATION CIRCUIT
1µF
1µF
VIN
3V ^CIN
to
5.5V ^1µF
OFF ON
23.7kΩ
C1+
V_IN
C1- C2+
C2-
VOUT
CAT3603
EN
RSET
GND
LED1
LED2
LED3
VOUT
COUT
1µF
20mA
Note: Unused LED channels must be connected to VOUT.
1
Doc. No. MD-5017 Rev. F