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AIC1577

External NMOS Step-Down PWM Controller

Analog Intergrations 

AIC1577

External NMOS Step-Down PWM Controller

FEATURES

N-Channel MOSFET Drive

Operating Input Voltage from 4.5V to 24V

Wide Ouput Range : 0.8V to 20V

±1.5% 0.8V Reference

Low Dropout Operation : 95% Duty Cycle

500KHz Fixed Constant Frequency

Low Standby Current, IQ Typically 720µA

Logic-Control Micropower Shutdown

Output Overvoltage Protection

Internal Diode for Bootstrapped Gate Drive

Current Mode Operation for Excellent Line and

Load Transient Response

Available in an 8-Lead SO and MSOP Package

APPLICATIONS

LCD Monitor

Palmtop Computers, PDAs

Wireless Modems

On-Card Switching Regulators

DC Power Distribution Systems

DESCRIPTION

The AIC1577 is a current mode switching

regulator controller that drives external N-

channel power MOSFET using a fixed fre-

quency architecure. It uses external divider to

adjust output voltage from 0.8V to 20V with

excellent line and load regulation. A maximum

high duty cycle limit of 95% provides low

dropout operation which extends operating

time in battery-operated systems.

Switching frequency up to 500KHz are

achievable thus allowing smaller sized filter

components. The operating current level is

user-programmable via an external current

sense resistor. It also provide output overvolt-

age protection under fault conditions.

A multifunction pin (ITH/RUN) allows external

compensation for optimum load step re-

sponse plus shutdown. Soft start can also be

implemented with this pin to properly se-

quence supplies. Package available are in

SOP8 and MSOP8 for SMD.

Analog Integrations Corporation

Si-Soft Research Center

3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.

TEL: 886-3-5772500

FAX: 886-3-5772510 www.analog.com.tw

DS-1577P-02 010405

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