RT9261B-21CX Datasheet

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Preliminary

RT9261B

VFM Step-up DC/DC Converter

General Description

The RT9261B Series are VFM Step-up DC/DC

converter ICs with ultra low supply current by CMOS

process and suitable for use with battery-powered

instruments.

The RT9261B 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 with the

RT9261B IC and only three external components.

Features

Minimal Number of External Components

(Only an Inductor, a Diode, and a Capacitor)

Ultra Low Input Current (6.5碌A at Switch Off)

碌

Capable of Supplying 50mA Output Current

with Internal Switch

卤

2% Output Voltage Accuracy

Low Ripple and Low Noise

Low Start-up Voltage, 0.8V at 1mA

80% Efficiency with Low Cost Inductor

+50 ppm/掳C Low Temperature-Drift

掳

SOT-89 and SOT-25 Small Packages

Applications

The CE pin enables the circuit to set the standby

supply current at a maximum of 0.5碌A.

Power source for battery-powered equipment

Power source for cameras, camcorders, VCRs,

PDAs, pagers, electronic data banks, and hand-

held communication equipment

Power source for appliances, which require

higher voltage than that of batteries used in the

appliances

Ordering Information

RT9261B-

Package type

B : SOT-25

X : SOT-89

Operating temperature range

C: Commercial standard

Output voltage

15 : 1.5V

16 : 1.6V

:

49 : 4.9V

50 : 5.0V

Pin Configurations

Part Number

RT9261B-

CX

1

2

3

Pin Configurations

TOP VIEW

1. GND

2. VOUT (TAB)

3. LX

TOP VIEW

5

4

(Plastic SOT-89)

RT9261B-

CB

(Plastic SOT-25)

1

2

3

CE

VOUT

NC

GND

5.

LX

1.

2.

3.

4.

DS9261B-03 September 2001

www.richtek-ic.com.tw

1

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