CAT3604 Driver Datasheet

CAT3604 Datasheet PDF, Equivalent


Part Number

CAT3604

Description

4-Channel Regulated Charge Pump White LED Driver

Manufacture

Catalyst Semiconductor

Total Page 11 Pages
Datasheet
Download CAT3604 Datasheet


CAT3604
www.DataSheet4U.com
CAT3604
4-Channel Regulated Charge Pump White LED Driver
FEATURES
I Drives individually up to 4 LEDs
I Output current up to 30mA per LED
I Digital control On/Off of each LED
I Compatible with supply voltage of 3V to 5.5V
I Power efficiency up to 93%
I 2 modes of operation 1x and 1.5x
I Automatic short circuit detect/disable
I High-frequency Operation at 1MHz
I Low value ceramic capacitors
I "604" compatible pinout
I Soft start and current limiting
I Thin QFN 16-lead package, 4x4mm, 0.8mm
max height
APPLICATIONS
I Color LCD and keypad Backlighting
I Cellular Phones
I Handheld Devices
I Digital Cameras
I PDAs
I Portable MP3 players
DESCRIPTION
The CAT3604 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 1MHz typical allows the
use of very small value ceramic capacitors.
The CAT3604 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 RSET controls the output current
level. LED currents of up to 30mA are supported
over a range of input supply voltages from 3V to
5.5V, 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 CAT3604 features short circuit and overcurrent
limiting protection. The device is available in a 16-
lead thin QFN package with a max height of 0.8mm.
TYPICAL APPLICATION
Battery
+
-
VIN
3V to 4.2V
EN
CIN
Control 0
Control 1
Control 2
RSET
C1+ C1- C2+ C2-
VIN VOUT
EN CAT3604
CTR0
LED1
CTR1
LED2
CTR2
LED3
RSET
GND
LED4
COUT
20mA
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 5008, Rev. I

CAT3604
CAT3604
ORDERING INFORMATION
Part Number
Package
Quantity per Reel
CAT3604HS4-TE13
CAT3604HV4-TE13
Thin QFN-16 4x4mm
Thin QFN-16 4x4mm
Lead Free
2000
2000
PIN CONFIGURATION
Top View
EN 1
LED1 LED2 LED3 LED4
16 15 14 13
12 GND
Package Marking
C364
G364
CTR0 2
CTR1 3
GND
11 C2+
10 C2-
CTR2 4
567
RSET VOUT VIN
8
C1+
9 C1-
16-lead Thin QFN (4mm x 4mm)
Note: The package exposed pad is electrically connected inside the package to GND and to pin 12.
PIN DESCRIPTIONS
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pad
Name
EN
CTR0
CTR1
CTR2
RSET
VOUT
VIN
C1+
C1-
C2-
C2+
GND
LED4
LED3
LED2
LED1
GND Pad
Function
Enable input, active HIGH
Digital control input 0
Digital control input 1
Digital control input 2
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
Ground reference
LED 4 cathode terminal
LED 3 cathode terminal
LED 2 cathode terminal
LED 1 cathode terminal
Ground reference
Doc. No. 5008, Rev. I
© 2005 by Catalyst Semiconductor, Inc.
2 Characteristics subject to change without notice


Features www.DataSheet4U.com CAT3604 4-Channel R egulated Charge Pump White LED Driver F EATURES I I I I I Drives individually up to 4 LEDs Output current up to 30mA per LED Digital control On/Off of each LED Compatible with supply voltage of 3 V to 5.5V I I Automatic short circuit detect/disable I High-frequency Operat ion at 1MHz Low value ceramic capacitor s I "604" compatible pinout I Soft star t and current limiting I Thin QFN 16-le ad package, 4x4mm, 0.8mm max height Po wer efficiency up to 93% I 2 modes of o peration 1x and 1.5x APPLICATIONS I C olor LCD and keypad Backlighting I Cell ular Phones I Handheld Devices I I Di gital Cameras I PDAs Portable MP3 playe rs DESCRIPTION The CAT3604 is a charge pump operating in either 1x (LDO) mode or 1.5x fractional mode regulating cur rent through each of the 4 LED pins. Op eration at a fixed high frequency of 1M Hz typical allows the use of very small value ceramic capacitors. The CAT3604 drives white light-emitting diodes (LEDs) connected in parallel.
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