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參數(shù)資料
| 型號： | RT9271 |
| 英文描述： | Step-up DC/DC Converter |
| 中文描述： | 升壓型DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 386K |
| 代理商： | RT9271 |
Preliminary
RT9271
DS9271-01 July 2003
www.richtek.com
1
White LED Step-Up Converter in Tiny Package
General Description
The RT9271 is a step-up DC/DC converter specifically
designed to drive white LEDs with a constant current.
The device can drive one to four LEDs in series from a
Li-Ion cell. Series connection of the LEDs provides
identical LED currents resulting in uniform brightness
and eliminating the need for ballast resistors. The
RT9271 switches at 1.1 MHz, allowing the use of tiny
external components. The input and output capacitor
can be as small as 1uF, saving space and cost versus
alternative solutions. A low 0.25V feedback voltage
minimizes power loss in the current setting resistor for
better efficiency.
The RT9271 is available in low profile SOT26 package.
Ordering Information
Marking Information
For
representative directly or through a RichTek distributor
located in your area, otherwise visit our website for
detail.
marking
information,
contact
our
sales
Pin Assignment
Features
Inherently Matched LED Current
High Efficiency: 85% Typical
Drives Up to Four LEDs from 2.8V Supply
20V Internal Switch
Fast 1.1 MHz Switching Frequency
Uses Tiny 1 mm Tall Inductors
Requires Only 1uF Output Capacitor
Low Profile SOT-26 Package
Optional 15V Over Voltage Protection
Applications
Mobile Phone
Digital Still Camera
PDAs, Handheld Computers
MP3 Players
GPS Receivers
Pin Configurations
Part Number
Pin Configuration
RT9271CE
(Plastic SOT-26)
Pin
Name
Function
1
2
LX
GND Ground Pin. Connect directly to local ground plane.
Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI
3
FB
Feedback Pin. Reference voltage is 0.25V. Connect cathode of lowest LED and resistor here.
Calculate resistor value according to the formula: R
FB
= 0.25/I
LED
Chip Enable Pin. Connect to 1.4V or higher to enable device, 0.4V or less to disable device.
Over Voltage Protection Pin. Voltage sensing input to trigger the function of over voltage protection,
the trip point is 15.5V. Leave it unconnected to disable this function.
Input Voltage Pin. Must be locally bypass with 1uF capacitor to GND.
4
5
CE
OVP
6
VCC
RT9271
Package Type
E : SOT-26
Operating Temperature Range
C : Commercial Standard
1
2
3
5
4
LX
GND
FB
CE
OVP
6
VCC
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RT9271GB | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:White LED Step-Up Converter in Tiny Package |
| RT9271GE | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:White LED Step-Up Converter in Tiny Package |
| RT9271PB | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:White LED Step-Up Converter in Tiny Package |
| RT9271PE | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:White LED Step-Up Converter in Tiny Package |
| RT9272 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:High Performance, Constant Current LED Driver for Dual Panel Mobile Phone |
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