TECHNICAL DATA
Switching Voltage Regulators
IK1509-xx
Features
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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
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Input voltage range up to 22V
SOP-8
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
IK1509
TA = -40° to 125° C for all packages
Applications
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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°C with 5°C hysteresis.
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IKSEMICON [ IK SEMICON CO., LTD ]
