1

8 -

Rev.1.2

http://www.elm-tech.com

Parameter

Symbol

Limit

Unit

VIN power supply voltage

Vin

-0.3 to +40

V

Apply voltage to FB

Vfb

GND-0.3 to Vin

V

Apply voltage to EN

Ven

GND-0.3 to Vin+0.3

V

Apply voltage to SW

Vsw

GND-0.3 to Vin+0.3

V

Apply voltage to VC

Vc

Vin-20 to Vin+0.3

V

Power dissipation

Pd

300

mW

Operating temperature range

Top

-40 to +85

°C

Storage temperature range

Tstg

-65 to +150

°C

■General description

■Features

■Maximum absolute ratings

• PC motherboard

• LCD monitor

• Graphic card

• DVD, Blu-ray player

• Telecom equipment

• ADSL modem

• Printer and other peripheral equipment

• Microcomputer power supply

• Network power supply

■Application

• Input voltage

: 5.5V to 36V

• Output voltage

: 0.8V to Vin

• Output current

: 3.0A

• Duty ratio

: 0% to 100%

• Constant frequency

: Typ.150kHz

• Soft-start

• Thermal shutdown protection

• Short circuit protection

• Built-in internal P-channel MOS

• Package

: SOP-8

ELM612DA is a of step-down switching regulator with PWM control, reference voltage source, oscillation

circuit, error amplifier, internal PMOS, etc. ELM612DA provides low-ripple power, high efficiency, and

excellent transient characteristics; PWM control circuit is able to vary the duty ratio linearly from 0 up to 100%.

ELM612DA also contains error amplifier circuit as well as soft-start circuit that prevents overshoot at during

startup. Internal enable function, over current protect function and short circuit protect function will reduce the

operation frequency from 150kHz to 30kHz when overmuch current or short circuit occurs. Meanwhile, internal

compensation block is able to minimize the quantity of required external component. With internal P-channel

Power MOS, and externally connected coil, capacitor, and diode, ELM612DA is able to function as step-

down switching regulator. By the small package of SOP-8, ELM612DA is capable of working as ideal power

supply units for many devices while providing outstanding features such as low current consumption. Since this

converter accommodates input voltage up to 36V, ELM612DA is also suitable for AC adapter applications.

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