RT9278 Datasheet, PDF (1/13 Pages) Richtek Technology Corporation – High Efficiency Boost LDO Converter & High Power White LED Driver

Preliminary
RT9278
High Efficiency Boost LDO Converter & High Power White
LED Driver
General Description
Features
The RT9278 is a compact, high efficiency, synchronous
step-up converter, it provides a power supply solution for
products powered by either two-cell, three-cell Alkaline/
NiMH or one-cell Li-Ion/Li-polymer battery.
The RT9278 is boost converter with PWM control loop,
provide up to 95% efficiency by using a synchronous
rectifier. The maximum peak current in the internal switch
is limited to up to 2A.
It keeps the output voltage regulated when the input
voltage exceeds the setting output voltage. The output
voltage can be set by an external resister divider, or be
fixed to reduce external components. It integrates a linear
controller for linear regulator.
RT9278 is available in VDFN-10L 3x3 package.
l 95% Efficiency Synchronous Boost Converter
l High Supply Capability
l 2A Current Limit
l Input Voltage Range : 1.5V to 5.5V
l 600kHz Fixed Switching Rate
l Adjustable Output Voltage Options Up to 5.5V
l Output Voltage Keep Regulated when Input Voltage
Exceed Setting Output Voltage
l 1µA Supply Current in Shutdown Mode
l External Compensation Network
l Build in Linear Controller for Linear Regulator
l Over Temperature Protection
l Small 10-Lead VDFN Package
l RoHS Compliant and 100% Lead (Pb)-Free
Applications
Ordering Information
RT9278
Package Type
QV : VDFN-10L 3x3 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
l Digital Still Camera
l Camera White LED Flash Light
l PDAs
l Portable Device
Pin Configurations
(TOP VIEW)
Note :
Richtek Pb-free and Green products are :
}RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
}Suitable for use in SnPb or Pb-free soldering processes.
}100% matte tin (Sn) plating.
FB ¹
COMP 2
GND ³
EN 4
LX 5
GND
11
10 _LFB
9 _LDRI
8 _PGND
7 _VDD
VOUT
VDFN-10L 3x3
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.
DS9278-04 August 2007
www.richtek.com
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