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PDF CAT3606 Data sheet ( Hoja de datos )
| Número de pieza | CAT3606 | |
| Descripción | 6-Channel Low Noise Charge Pump White LED Driver | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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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
1 page  
CAT3606
The enable lines ENM and ENS allow to turn On or
Off a group of LEDs as shown in Table 2.
Control Lines
EN ENM ENS
0 XX
1 11
101
1 10
1 00
LED Outputs
Main
Sub
LED1 - LED4 LED5 - LED6
--
--
ON -
- ON
ON ON
Table 2: LED Selection
Notes: 1 = logic high (or VIN)
0 = logic low (or GND)
- = LED output OFF
X = don't care
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 0.2mA. When the following equation is true
on any channel, the driver turns off the LED channel:
VOUT - VLED ≤ 1V (LED channel OFF)
Note: The CAT3606 is designed to drive LEDs with
forward voltage greater than 1V and is not
compatible with resistive loads.
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. 5009, Rev. B
5 Page 
REVISION HISTORY
Date
1/21/2005
08/01/2005
Rev.
A
B
Reason
Initial issue
Update LED Current Setting
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 #: 5009
Revison:
B
Issue date: 08/01/05
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet CAT3606.PDF ] | |
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