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參數資料
| 型號： | CAT37TDI-TE7 |
| 元件分類： | LED驅動器 |
| 英文描述： | CMOS White LED Driver Boost Converter |
| 中文描述： | 的CMOS白光LED驅動器升壓轉換器 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 566K |
| 代理商： | CAT37TDI-TE7 |
2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
CAT37
CMOS White LED Driver Boost Converter
Doc. No. 5005, Rev. S
TYPICAL APPLICATION
C1: Taiyo Yuden JMK212BJ475
C2: Taiyo Yuden EMK212BJ105
D1: Zetez ZHCS400
L1: Panasonic ELJEA6R8 or equivalent
SOT23 Pin Numbers
Figure 1. Driver for Four High-Brightness White LEDs
2
3
1
5
4
SW
VIN
SHDN
D1
VIN
3 V to 5 V
CAT37
FB
GND
OFF ON
15mA
FEATURES
I
Low quiescent ground current (0.5mA typical)
I
Power efficiency over 80%
I
Compatible pinout with LT1937
I
Adjustable output current (up to 40mA)
I
High frequency 1.2MHz operation
I
Input voltage operation down to 2.5V
I
Low resistance (0.5
) power switch
I
Drives up to 4 White LEDs in series
I
Shutdown current less than 1
μ
A
I
Load fault protection against open-circuits
I
Low value external components
I
Low profile 5-lead SOT23 (1mm max) package
DESCRIPTION
The CAT37 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 CAT37 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 R1 controls the
output current level. LED currents of up to 40mA can
be supported over a wide range of input supply voltages
from 2.5V to 7V, making the device ideal for battery-
powered applications.
APPLICATIONS
I
Color LCD and keypad backlighting
I
Cellular phones
I
Handheld terminals
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)
5-lead thin SOT23 package.
I
Digital cameras
I
PDAs/Games
I
Portable MP3 players
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