CAT3604AHV4-T2 Datasheet, PDF (1/11 Pages) ON Semiconductor – 4-Channel Regulated Charge Pump White LED Driver

CAT3604A
4-Channel Regulated
Charge Pump White LED
Driver
Description
The CAT3604A is a charge pump operating in either 1x (LDO)
mode or 1.5x fractional mode regulating current through each of the 4
LED pins. Operation at a fixed high frequency of 1 MHz typical
allows the use of very small value ceramic capacitors.
The CAT3604A drives white light-emitting diodes (LEDs)
connected in parallel and provides tightly matched regulated current to
achieve uniformity of brightness in LCD backlighting applications.
An external resistor R_SET controls the output current level. LED
currents of up to 30 mA are supported over a range of input supply
voltages from 3 V to 5.5 V, making the device ideal for
battery-powered applications.
LED dimming can be accomplished by several methods including
using a DC voltage to set the RSET pin current, applying a PWM
signal on the Control signals, or adding a switched resistor in parallel
with RSET. The Enable input pin allows the device to be placed in
power-down mode with “zero” quiescent current.
The CAT3604A features short circuit and overcurrent limiting
protection. The device is available in a 16−pad TQFN package with a
max height of 0.8 mm.
Features
• Drives Individually up to 4 LEDs
• Output Current up to 30 mA per LED
• Compatible with Supply Voltage of 3 V to 5.5 V
• Power Efficiency up to 93%
• 2 Modes of Operation 1x and 1.5x
• LED On/Off by Control Lines
• High−frequency Operation at 1 MHz
• Low Value Ceramic Capacitors
• “604” Compatible Pinout
• Soft Start and Current Limiting
• TQFN 16−pad Package, 4 x 4 mm, 0.8 mm Max Height
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• Color LCD and Keypad Backlighting
• Cellular Phones
• Handheld Devices
• Digital Cameras
• PDAs
• Portable MP3 Players
http://onsemi.com
TQFN−16
HV4 SUFFIX
CASE 510AE
PIN CONNECTIONS (Note 1)
1
EN
CTR0
CTR1
CTR2
GND
GND
C2+
C2−
C1−
(4 x 4 mm) (Top View)
MARKING DIAGRAMS
E364
E364 = CAT3604AHV4−T2
ORDERING INFORMATION
Device
CAT3604AHV4−T2
Package
TQFN−16
(Note 2)
Shipping
2,000/
Tape & Reel
1. The package exposed pad is electrically connec-
ted inside the package to GND and to pin 12.
2. Matte−Tin Plated Finish (RoHS−compliant).
© Semiconductor Components Industries, LLC, 2010
1
November, 2010 − Rev. 0
Publication Order Number:
CAT3604A/D