eorex

(Preliminary)

EP3102

Nov. 2006

www.eorex.com

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150 KHz, 2A Asynchronous Step-down Converter

Features

• 3.3V, 5V, 12V and Adjustable Output Version

• Adjustable Version Output Voltage Range,

1.23V to 37V +4% Max over Line and Load

Condition

• Input Voltage Range up to 40V

• Output Load Current: 2A

• 150 KHz Fixed Frequency Internal Oscillator

• Voltage Mode Non-synchronous PWM Control

• Thermal-shutdown and Current-limit Protection

• ON/OFF Shutdown Control Input

• Low Power Standby Mode

• Built-in Switching Transistor on Chip

• SOP-8L package

Applications

• Simple High-efficiency Step-down (Buck)

Regulator

• Efficient Pre-regulator for Linear Regulators

• On-card Switching Regulators

• Positive to Negative Converter

• Battery Charger

Description

The EP3102 is a monolithic integrated circuit that

provide all the active functions for a step-down

switching regulator, capable of driving a 2A load

without

additional

transistor

component.

Requiring a minimum number of external

component, the board space can be saved easily.

The external shutdown function can be controlled

by TTL logic level and then come into standby

mode.

The

internal

compensation

makes

feedback control have good line and load

regulation without external design. Regarding

protected function, thermal shutdown is to

prevent over temperature operating from damage,

and current limit is against over current operating

of the output switch. The EP3102 operates at a

switching frequency of 150KHz thus allowing

smaller sized filter components than what would

be needed with lower frequency switching

regulators. Other features include a guaranteed

+4% tolerance on output voltage under specified

input voltage and output load conditions, and

+15% on the oscillator frequency. The output

version included fixed 3.3V, 5V, 12V, and an

adjustable type. The package is available in a

standard 8-lead SOP8.

Typical Application