TECHNICAL DATA

1

Switching Voltage Regulators

Features

•

3.3V, 5V, 12V, and adjustable output versions

•

Adjustable version output voltage range, 1.23V to

18V ± 3% max over line and load conditions

•

Guaranteed 2A output load current

•

Input voltage range up to 22V

•

Built-in Switching Transistor on chip

•

Excellent line and load regulation specifications

•

150kHz fixed frequency internal oscillator

•

TTL shutdown capability

•

Low power standby mode, IQ typically 80uA

•

Thermal shutdown and current limit protection

•

Bare chip is available

Applications

•

Simple high-efficiency step-down regulator

•

On-card switching regulators

•

Positive to negative converter

Description

The IK1509 series of regulators are monolithic integrated circuits that provide all the active

functions for a step-down switching regulator, capable of driving a 2A load with excellent line and

load regulation. These devices are available in fixed output voltages of 3.3V, 15V, 12V and an

adjustable output version. Requiring a minimum number of external components, these regulators

are simple to use.

The IK1509 series operates at a switching frequency of 150kHz. Other features include a

guaranteed ± 3% tolerance on output voltage under specified input voltage and output load

conditions, and ± 15% on the oscillator frequency. External shutdown is included, featuring

typically 80uA standby current. Self protection features include a two stage frequency reducing

current limit for output switch and an over temperature shutdown for complete protection under

fault conditions. The over temperature shutdown level is about 145

IK1509-xx

SOP-8

IK1509