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RT9271 Datasheet

  • RT9271

  • Step-up DC/DC Converter

  • 12頁

  • ETC

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Preliminary
RT9271
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.
Features
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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
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Mobile Phone
Digital Still Camera
PDAs, Handheld Computers
MP3 Players
GPS Receivers
Ordering Information
RT9271
Package Type
E : SOT-26
Operating Temperature Range
C : Commercial Standard
Pin Configurations
Part Number
Pin Configuration
LX
1
2
3
6
5
4
VCC
OVP
CE
Marking Information
For marking information, contact our sales
representative directly or through a RichTek distributor
located in your area, otherwise visit our website for
detail.
RT9271CE
(Plastic SOT-26)
GND
FB
Pin Assignment
Pin
1
2
3
4
5
6
Name
LX
GND
FB
CE
OVP
VCC
Function
Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI
Ground Pin. Connect directly to local ground plane.
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.
DS9271-01
July 2003
www.richtek.com
1

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