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PDF CAT32 Data sheet ( Hoja de datos )
| Número de pieza | CAT32 | |
| Descripción | CMOS White LED Driver | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT32 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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CAT32
CMOS White LED Driver
FEATURES
s Low quiescent ground current (0.5mA typical)
www.datasheet4u.com
s Power efficiency over 80%
s Compatible pinout with LT1932
s Adjustable output current (up to 40mA)
s High frequency 1.2MHz operation
s Input voltage operation down to 2.0V
s Low resistance (0.5Ω) high voltage
power switch
APPLICATIONS
s Color LCD and keypad backlighting
s Cellular phones
s Handheld terminals
DESCRIPTION
The CAT32 is a DC/DC step up converter that delivers
a regulated output current. Operation at a constant
switching frequency of 1.2MHz allows the device to be
used with very small value external inductor and ceramic
capacitors.
The CAT32 is targeted to drive multiple white light-
emitting diodes (LEDs) connected in series and provides
the necessary regulated current to control the brightness
and the color purity. An external resistor RSET controls
the output current level. LED currents of up to 40mA
can be supported over a wide range of input supply
voltages from 2V to 7V, making the device ideal for
battery-powered applications.
TYPICAL APPLICATION
VIN
2.7V to 4.2V
ALOGEN FR
LEA D F REETM
s Drives up to 4 White LEDs in series
s Shutdown current less than 1µA
s Load fault protection against open-circuits
s Low value external components
s Low profile (1mm) 6-lead SOT23 and TDFN
(0.8mm) package
s Digital cameras
s PDAs/Games
s Portable MP3 players
A high voltage output stage allows up to 4 White LEDs
to be driven in series. Series drive provides inherent
current matching.
LED dimming can be done by using a DC voltage, a
logic signal, or a pulse width modulation (PWM) signal.
The shutdown input pin allows the device to be placed
in power-down mode with “near zero” quiescent current.
In addition to overcurrent limiting protection, the device
also includes detection circuitry to ensure protection
against open-circuit load fault conditions.
The device is available in a low profile (1mm max height)
6-lead thin SOT23 package and in a TDFN (0.8mm max
height) package.
D1
61
VIN SW
PWM
DIMMING
CONTROL
CAT32
5 SHDN
LED 3
RSET
4
GND
2
15mA
SOT23 Pin Numbers
Figure 1. Li-Ion Driver for Four High-Brightness White LEDs
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
C1: Taiyo Yuden JMK212BJ475
C2: Taiyo Yuden EMK212BJ105
D1: Zetez ZHCS400
L1: Sumida CLQ4D106R8
(Panasonic ELJEA6R8)
Doc No. 5001, Rev. AC
1 page  
CAT32
TYPICAL CHARACTERISTICS
VIN=3.6V,TAMB=25˚C, CIN=4.7µF, COUT=1µF, L=6.8µH, unless otherwise specified.
Switch Resistance vs. Input Voltage
1.0
www.datasheet4u.com
0.8
0.6
0.4
0.2
0.0
2
345
INPUT VOLTAGE [V]
6
Switch Resistance vs. Temperature
1.0
0.8
0.6 VIN = 3V
0.4
0.2
0.0
-50 -25 0 25 50 75 100 125
LED Pin Voltage vs. LED current
300
250
200
150
100
50
0
0 8 16 24 32 40
LED CURRENT [mA]
Vsw, IL, & Vout Signal Waveforms
VIN = 3.7V with 15mA load through 4 LEDs
Efficiency vs. Input Voltage
85
80
75
4 LEDs at 15mA
70 Vout =13V
65
60
2
34
5
INPUT VOLTAGE [V]
6
PWM on SHDN pin Waveform
5 Doc No. 5001, Rev. AC
5 Page 
Four LEDs with PWM Dimming Control:
D1
VIN
www.datasheet4u.com
61
VIN SW
PWM
DIMMING
CONTROL
CAT32
5 SHDN
3
LED
RSET
4
GND
2
15mA
Efficiency - Four LEDs
CAT32
85
80
75
70
65
60
0
Vin = 4.2V
Vin = 3.0V
5 10 15
LED CURRENT [mA]
20
11 Doc No. 5001, Rev. AC
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CAT32.PDF ] | |
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