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PDF CAT3604 Data sheet ( Hoja de datos )
| Número de pieza | CAT3604 | |
| Descripción | 4-Channel Regulated Charge Pump White LED Driver | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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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
1 page  
CAT3604
LED CURRENT SETTING
The LED current is set by the external resistor RSET
connected between the RSET pin and ground.
Table 1 lists various LED currents and the associ-
ated RSET resistor value for standard 1% precision
surface mount resistors.
LED Current (mA)
1
2
5
10
15
20
30
RSET (kΩ)
649
287
102
49.9
32.4
23.7
15.4
SHORT CIRCUIT DETECT/DISABLE
The unused LED channels can also be turned off by
connecting the respective LED pins to VOUT. In
which case, the corresponding LED driver is disabled
and the typical LED sink current is only about 20µA.
When the following equation is true on any channel,
the driver turns off the LED channel:
VOUT - VLED ≤ 1V (LED channel OFF)
Note: The CAT3604 is designed to drive LEDs with
forward voltage greater than 1V and is not compatible
with resistive loads.
Table 1. RSET Resistor Selection
The digital control lines CTR0, CTR1 adn CTR2
allow to turn On or Off a combition of LEDs as
shown in Table 2.
CTR2
0
0
0
0
1
1
1
1
Control Lines
CTR1
0
0
1
1
0
0
1
1
Notes: 1 = logic high (or VIN)
0 = logic low (or GND)
- = LED output OFF
CTR0
0
1
0
1
0
1
0
1
LED4
-
-
-
ON
-
-
ON
-
LED Outputs
LED3
LED2
--
- ON
ON -
--
- ON
ON ON
ON ON
--
Table 2: LED Selection
LED1
ON
-
-
-
ON
ON
ON
-
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. 5008, Rev. I
5 Page 
REVISION HISTORY
Date
8/19/2004
9/21/2004
9/22/2004
9/29/2004
1/4/2005
1/21/2005
04/15/2005
Rev.
A
B
C
D
E
F
G
06/06/2005
07/15/2005
H
I
Reason
Initial issue
Minor Changes
Added Green package in all areas
Minor Changes
Added QFN land pattern (figure 3)
Minor Changes
Update Features
Update Short Circuit Detect/Disable
Update Ordering Information
Update Basic Operation
Copyrights, Trademarks and Patents
Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:
DPP ™ AE2 ™ MiniPot™
Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. For a complete list of patents
issued to Catalyst Semiconductor contact the Company’s corporate office at 408.542.1000.
CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS
PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE
RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING
OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES.
Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or
other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a
situation where personal injury or death may occur.
Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets
labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale.
Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate
typical semiconductor applications and may not be complete.
Catalyst Semiconductor, Inc.
Corporate Headquarters
1250 Borregas Avenue
Sunnyvale, CA 94089
Phone: 408.542.1000
Fax: 408.542.1200
www.caalyst-semiconductor.com
Publication #: 5008
Revison:
I
Issue date: 07/15/05
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet CAT3604.PDF ] | |
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