CAT3606 Driver Datasheet

CAT3606 Datasheet PDF, Equivalent


Part Number

CAT3606

Description

6-Channel Low Noise Charge Pump White LED Driver

Manufacture

Catalyst Semiconductor

Total Page 11 Pages
Datasheet
Download CAT3606 Datasheet


CAT3606
www.DataSheet4U.com
CAT3606
6-Channel Low Noise Charge Pump White LED Driver
FEATURES
I Drives up to 4 main LEDs and 2 sub LEDs
I Separate control for main and sub LEDs
I Compatible with supply voltage of 3V to 5.5V
I Power efficiency up to 90%
I Output current up to 30mA per LED
I High-frequency Operation at 1MHz
I 2 modes of operation 1x and 1.5x
I White LED detect circuitry on all channels
I Shutdown current less than 1µA
I Small ceramic capacitors
I Soft start and current limiting
I Short circuit protection
I 16-lead thin QFN package, 0.8mm
max height
APPLICATIONS
I Cell phone main and sub-display backlight
I Navigation
I PDAs
I Digital Cameras
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 (RSET) 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 (ENM, ENS). Dimming can be achieved using
either a DC voltage to control the RSET pin current,
or by applying a PWM signal on the ENM and ENS
pins.
The device is available in a 16-lead thin QFN
package with a max height of 0.8mm.
TYPICAL APPLICATION CIRCUIT
Li-Ion
Battery +
-
CIN
ON/OFF
ENABLE
LED1-4
ENABLE
LED5-6
RSET
C1+ C1- C2+ C2-
VIN VOUT
CAT3606
EN LED1
ENM
LED2
LED3
ENS
LED4
RSET
GND
LED5
LED6
Main Display
Sub Display
COUT
20mA
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 5009, Rev. B

CAT3606
CAT3606
ORDERING INFORMATION
Part Number
Package
Quantity per Reel
CAT3606HS4
CAT3606HV4
Thin QFN-16 4x4mm
Thin QFN-16 4x4mm
Lead Free
2000
2000
PIN CONFIGURATION
Top View
LED6 1
LED5 LED4 LED3 LED2
16 15 14 13
12 LED1
EN 2
ENM 3
GND PAD
11 C2+
10 C2-
ENS 4
9 C1-
5 6 78
RSET VOUT VIN C1+
16-lead Thin QFN (4mm x 4mm)
Note: The "exposed pad" under the package must be connected to the ground plane on the PCB.
PIN DESCRIPTIONS
Package Marking
C366
G366
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PAD
Name
LED6
EN
ENM
ENS
RSET
VOUT
VIN
C1+
C1-
C2-
C2+
LED1
LED2
LED3
LED4
LED5
GND
Function
LED6 cathode terminal
Enable/shutdown input, active high
Enable "main" input for LED1 to LED4, active low
Enable "sub" input for LED5 and LED6, active low
The LED output current is set by the current sourced out of the RSET pin
Charge pump output connected to the LED anodes
Supply voltage
Bucket capacitor 1 terminal
Bucket capacitor 1 terminal
Bucket capacitor 2 terminal
Bucket capacitor 2 terminal
LED 1 cathode terminal
LED 2 cathode terminal
LED 3 cathode terminal
LED 4 cathode terminal
LED 5 cathode terminal
Ground reference
Doc. No. 5009, Rev. B
© 2005 by Catalyst Semiconductor, Inc.
2 Characteristics subject to change without notice


Features www.DataSheet4U.com CAT3606 6-Channel L ow Noise Charge Pump White LED Driver F EATURES I I I I I Drives up to 4 main LEDs and 2 sub LEDs Separate control fo r main and sub LEDs Compatible with sup ply voltage of 3V to 5.5V Power efficie ncy up to 90% I I White LED detect ci rcuitry on all channels I Shutdown curr ent less than 1µA Small ceramic capaci tors I Soft start and current limiting I Short circuit protection I 16-lead th in QFN package, 0.8mm max height Outpu t current up to 30mA per LED I High-fre quency Operation at 1MHz I 2 modes of o peration 1x and 1.5x APPLICATIONS I I Cell phone main and sub-display backli ght Navigation I PDAs I Digital Camer as DESCRIPTION The CAT3606 controls up to four LEDs for the main display and two LEDs for the sub-display in cellula r phones. The device is capable of oper ating in either 1x (LDO) mode or 1.5x c harge pump mode. All LED pin currents a re regulated and tightly matched to ach ieve uniformity of brightness across the LCD backlight. An exter.
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