CAT3606HV4-T2 Datasheet, PDF (1/12 Pages) ON Semiconductor – 6-Channel Low Noise Charge Pump White LED Driver

CAT3606
6-Channel Low Noise Charge Pump
White LED Driver
FEATURES
„ Drives up to 4 main LEDs and 2 sub LEDs
„ Separate control for main and sub LEDs
„ Compatible with supply voltage of 3V to 5.5V
„ Power efficiency up to 90%
„ Output current up to 30mA per LED
„ High-frequency Operation at 1MHz
„ 2 modes of operation 1x and 1.5x
„ White LED detect circuitry on all channels
„ Shutdown current less than 1µA
„ Small ceramic capacitors
„ Soft start and current limiting
„ Short circuit protection
„ 16-pad TQFN package, 0.8mm max height
APPLICATION
„ Cell phone main and sub-display backlight
„ Navigation
„ PDAs
„ Digital Cameras
ORDERING INFORMATION
Part
Number
Quantity
Package per Reel Marking
CAT3606HV4-T2 TQFN-16 ⁽¹⁾ 2000 G366
CAT3606HV4-GT2 TQFN-16 ⁽²⁾ 2000 CDBB
Notes: (1) Matte-Tin Plated Finish (RoHS-compliant).
(2) NiPdAu Plated Finish (RoHS-compliant).
DESCRIPTION
The CAT3606 controls up to four LEDs for the main
display and two LEDs for the sub-display in cellular
phones. The device is capable of operating in either
1x (LDO) mode or 1.5x charge pump mode. All LED
pin currents are regulated and tightly matched to
achieve uniformity of brightness across the LCD
backlight. An external resistor (R_SET) sets the
nominal output current.
The device can deliver as much as 20mA per
channel during low voltage operation (3V), and
30mA per channel during nominal operation (3.3V).
A constant high-frequency switching scheme (1MHz)
provides low noise and allows the use of very small
value ceramic capacitors..
A “zero” quiescent current mode can be achieved
via the chip enable pin EN. The Main and Sub LEDs
each have their own dedicated ON/OFF control pins
E¯N¯M¯ , E¯N¯¯S Dimming can be achieved using either a
DC voltage to control the R_SET pin current, or by
applying a PWM signal on the E¯N¯M¯ and E¯N¯¯S pins.
The device is available in a 16-pad TQFN package
with a max height of 0.8mm.
For Ordering Information details, see page 11.
TYPICAL APPLICATION CIRCUIT
1µF
1µF
Li-Ion
Battery ₊
-
C_IN
1µF
ON/OFF
ENABLE
LED1-4
ENABLE
LED5-6
RSET
24kΩ
C1+ C1- C2+ C2-
VIN
VOUT
CAT3606
EN
LED1
ENM
LED2
LED3
ENS
LED4
RSET
GND
LED5
LED6
Main Display
Sub Display
C_OUT
1µF
20mA
© 2008 SCILLC. All rights reserved.
1
Characteristics subject to change without notice
Doc. No. MD-5009 Rev. D