1

Rev.1.1

Parameter

Symbol

Limit

Unit

VIN power supply voltage

Vin

-0.3 to +6.5

V

Apply voltage to SW

Vsw

GND-0.3 to Vin+0.3

V

Apply voltage to EN

Ven

GND-0.3 to Vin+0.3

V

Apply voltage to FB

Vfb

GND-0.3 to Vin+0.3

V

SW peak current

Isw

1.7

A

Power dissipation

Pd

200

mW

Operating temperature range

Top

-40 to +85

°C

Storage temperature range

Tstg

-65 to +150

°C

■General description

■Features

■Maximum absolute ratings

• Cellular phone

• PDA and smart phone

• MP3 player

• Digital camera

• Wireless and DSL card

• Microcomputer and DSP power supply

• Portable machine

■Application

• Current mode operation

• Thermal shutdown protection and short circuit protection

• Constant frequency

: Typ.1.4MHz

• Output current

: 800mA

• High efficiency

: Max.95%

• Shutdown current

: Max.1µA(Ven=0V, Vin=6V)

• Supply voltage

: 2.5V to 6V

• Low quiescent current

: Typ.200µA

• Full duty ratio

: 0 to 100% (in dropout)

• Package

: TSOT-25

ELM600LA is high efficiency synchronous step down DC/DC converter operated with current mode and 1.4MHz

constant frequency; internal switch and synchronous rectifier are integrated for high efficiency. In application,

ELM600LA does not require any external Schottky diode. Internal current consumption under operation of

ELM600LA is as low as 200µA and drops to less than 1µA in shutdown mode. With supply voltage from 2.5V

to 6V, ELM600LA can supply load current of 800mA; the output voltage can be regulated as low as 0.6V.

With 1.4MHz switching frequency, ELM600LA makes it possible to adopt small surface amount inductors and

capacitors. Switch duty cycle would be on continuously and 100% at maximum when input voltage is set be to

lower than output voltage.

Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.

* Taping direction is one way.

ELM600LA-S, ELM600LA-xx-S

Symbol

a

Package

L: TSOT-25

b

Product version

A

c, d

Output voltage

e.g. :

12: Vout=1.2V, 18: Vout=1.8V

e

Taping direction

S: Refer to PKG file

ELM600 LA - x x - S

↑ ↑ ↑ ↑ ↑

a b c d e

ELM600LA - S

↑ ↑ ↑

a b e

■Selection guide

• Fixed version

• Adj. version

high efficiency synchronous PWM step down DC/DC converter

10 -