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RT9261

VFM Step-Up DC/DC Converter

Richtek Technology 

Preliminary

RT9261/A

VFM Step-Up DC/DC Converter

General Description

Features

The RT9261 Series are VFM Step-up DC/DC ICs with ultra

low supply current by CMOS process and suitable for

use with battery-powered instruments.

The RT9261 IC consists of an oscillator, a VFM control

circuit, a driver transistor (LX switch), a reference voltage

unit, an error amplifier, resistors for voltage detection, and

a LX switch protection circuit. A low ripple and high

efficiency step-up DC/DC converter can be constructed of

this RT9261 IC with only three external components.

The RT9261A IC provides with a drive pin (EXT) for an

z Minimal Number of External Components ( Only

an Inductor, a Diode, and a Capacitor)

z Ultra Low Input Current ( 5μA at Switch Off)

z ± 2% High Output Voltage Accuracy

z Low Ripple and Low Noise

z Low Start-up Voltage, 0.85V at 1mA

z 75% Efficiency with Low Cost Inductor

z +50 ppm/ °C Low Temperature-Drift

z SOT-89 and SOT-23-5 Small Packages

z RoHS Compliant and 100% Lead (Pb)-Free

external transistor, so that a power transistor can be Applications

externally applied. Therefore, the RT9261A IC is

recommended for applications where large currents are

required. EN pin enables circuit to set the standby supply

current at a maximum of 0.5μA.

z Power source for battery-powered equipment

z Power source for cameras, camcorders, VCRs, PDAs,

pagers, electronic data banks, and hand-held

communication equipment

Ordering Information

z Power source for applications, which require higher

voltage than that of batteries used in the appliances

RT9261/A-

Package Type

B : SOT-23-5

Marking Information

X : SOT-89

For marking information, contact our sales representative

Operating Temperature Range

directly or through a RichTek distributor located in your

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer- area, otherwise visit our website for detail.

cial Standard)

Output Voltage

15 : 1.5V

16 : 1.6V

:

49 : 4.9V

50 : 5.0V

Pin Configurations

(TOP VIEW)

Use external switch

Use internal switch

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.

123

123

GND VOUT LX

(TAB)

RT9261-††CX

GND VOUT EXT

(TAB)

RT9261A-††CX

SOT-89

DS9261/A-12 March 2007

www.richtek.com

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