ELM91333CA-S datasheet, PDF - EEWORLD Datasheet

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ELM91333CA-S: DescriptionCMOS PFM Step-up DC/DC converter and controller; File Size1MB，22 Pages; ManufacturerELM Technology Corporation

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ELM91333CA-S Overview

CMOS PFM Step-up DC/DC converter and controller

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ELM91xxxxA

CMOS PFM Step-up DC/DC converter and controller

■General description

ELM91xx1xA is CMOS PFM control step-up DC-DC converter; ELM91xx3xA is CMOS PFM control step-

up DC-DC controller, which has large output current capacity by using an external FET switch. ELM91 series

consists of reference voltage source, error ampliﬁer, oscillation circuit, start-up circuit, PFM-control circuit,

switching current limit circuit (ELM91xx1xA only), switching transistor (ELM91xx1xA only) and output

voltage setting resistor. For external parts, coil, diode, MOSFET and capacitor are possible choices. The

standard output voltages are 1.8V,3.0V,3.3V,5.0V; ELM91 series can also be designed as semi-custom IC within

the range of 1.8V to 5.5V by 0.1V step.

■Features

•

Output voltage range

Low voltage operation

Oscillating frequency

Low power operation

High efficiency

Output current(e.g.)

Package

■Application

: 1.8V to 5.5V (by 0.1V)

• Constant voltage source for battery-

: 0.9V(ELM91xx1xA: Iout=1mA)

operated devices

: Typ.100kHz

• Portable communication equipments

: Typ.40µW(ELM91301xA: Typ.100kHz)

and video recorders

: 85%(ELM9130xxA: Vin=1.5V, Iout=10mA)

: 100mA(Vin=1.5V, Vout=3.0V)

: SOT-89, SOT-23, SC-70(SOT-323)

■Maximum absolute ratings

Parameter

Apply voltage to LX pin

Apply voltage to VOUT pin

Output current of LX pin

Output current of EXT pin

Power dissipation

Operationg temperature

Storage temperature

Symbol

Vlx

Vout

Ilx

Iext

Top

Tstg

Limit

Vss-0.3 to 7.0

500

500 (SOT-89)

250 (SOT-23)

150 (SC-70)

-40 to +85

-55 to +125

Unit

°C

■Selection guide

ELM91xxxxA-x

Symbol

a, b

e.g. :

Output voltage

18: Vout=1.8V 30: Vout=3.0V

33: Vout=3.3V 50: Vout=5.0V

1: Internal switch

Switching transistor

3: External switch

A: SOT-89

Package

B: SOT-23

C: SC-70(SOT-323)

Product version

Taping direction

S , N: Refer to PKG file

ELM91 x x x x A - x

↑ ↑ ↑ ↑ ↑ ↑

a b c d e f

22 - 1

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