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
°
C with 5
°
C hysteresis.


IK1509-xx








SOP-8


IK1509

T
A
= -40° to 125° C for all packages