LTC1435ACS High Efficiency Low Noise Synchronous Step-DowSwitching Regulator

FEATURES

Dual N-Channel MOSFET Synchronous Drive

Programmable Fixed Frequency

Wide VIN Range: 3.5V to 36V Operation

Low Minimum On-Time (≤300ns) for High

Frequency, Low Duty Cycle Applications

Very Low Dropout Operation: 99% Duty Cycle

Low Standby Current

Secondary Feedback Control

Programmable Soft Start

Remote Output Voltage Sense

Logic Controlled Micropower Shutdown: IQ 

< 25µA

Foldback Current Limiting (Optional)

Current Mode Operatiofor Excellent Line and Load

Transient Response

Output Voltages from 1.19V to 9V

Available i16-Lead Narrow SO and SSOP Packages

APPLICATIONS

Notebook and Palmtop Computers, PDAs

Cellular Telephones and Wireless Modems

Portable Instruments

Battery-Operated Devices

DC Power DistributioSystems

DESCRIPTION

The LTC®

1435A is a synchronous step-dowswitching

regulator controller that drives external N-channel power

MOSFETs using a fixed frequency architecture. A wide

duty cycle range of 5% to 99% allows high VIN to low VOUT

DC/DC conversion, as well as low dropout operatiothat

extends operating time ibattery-operated systems. Burst

ModeTM operatioprovides high efficiency at low load

currents.

The operating frequency is set by aexternal capacitor

allowing maximum flexibility ioptimizing efficiency. A

secondary winding feedback control pin, SFB, guarantees

regulatioregardless of load othe maioutput by

forcing continuous operation. Burst Mode operatiois

inhibited whethe SFB piis pulled low, which reduces

noise and RF interference.

Soft start is provided by aexternal capacitor that cabe

used to properly sequence supplies. The operating current level is user-programmable via aexternal current

sense resistor. Wide input supply range allows operation

from 3.5V to 30V (36V maximum).

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