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CAT32TDI-T3 参数 Datasheet PDF下载

CAT32TDI-T3图片预览
型号: CAT32TDI-T3
PDF下载: 下载PDF文件 查看货源
内容描述: CMOS白色LED驱动器 [CMOS White LED Driver]
分类和应用: 驱动器
文件页数/大小: 14 页 / 290 K
品牌: CATALYST [ CATALYST SEMICONDUCTOR ]
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CAT32
CMOS White LED Driver
FEATURES
Low quiescent ground current (0.5mA typical)
Power efficiency over 80%
Compatible pinout with LT1932
Adjustable output current (up to 40mA)
High frequency 1.2MHz operation
Input voltage operation down to 2.0V
Low resistance (0.5Ω) high voltage power switch
Drives up to 4 White LEDs in series
Shutdown current less than 1µA
Load fault protection against open-circuits
Low value external components
Low profile (1mm) TSOT-23 6-lead and TDFN
8-pad (0.8mm) package
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 R
SET
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.
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 TSOT-23 package and in an 8-pad
TDFN (0.8mm max height) package.
L
1
6.8µH
D1
APPLICATION
Color LCD and keypad backlighting
Cellular phones
Handheld terminals
Digital cameras
PDAs/Games
Portable MP3 players
For Ordering Information details, see page 14.
TYPICAL APPLICATION CIRCUIT
VIN
2.7V
to
4.2V
C1
4.7µF
6
VIN
CAT32
1
SW
PWM
DIMMING
CONTROL
5
SHDN
RSET
4
R
SET
1.50kΩ
LED
GND
2
3
15mA
C2
1µF
C1: Taiyo Yuden JMK212BJ475
C2: Taiyo Yuden EMK212BJ105
D1: Zetez ZHCS400
L1: Sumida CLQ4D106R8
(Panasonic ELJEA6R8)
TSOT-23 Pin Numbers
Figure 1. Li-Ion Driver for Four High-Brightness White LEDs
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-5001 Rev. AD