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SS6580/L

Step-Down DC/DC Controller with Shutdown

l

Operating Voltage up to 15V.

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Simple Voltage-Mode PWM Control.

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Fast Transient Response.

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2V and 1.3V

± 2% Feedback Voltage Reference

Options.

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Adjustable Current Limit without External Sense

Resistors.

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200 KHz Switching Oscillator.

l

Short-Circuit Protection with Low Short-Circuit

Output Current.

l

Low Shutdown Current

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Built-in Soft Start.

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l

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High-Power 5V to 3.xV DC/DC Regulators.

l

Low-Voltage Distributed Power Supplies.

The SS6580 is a high-power, high-efficiency

voltage-mode switching regulator controller for

Designed to drive an N-channel MOSFET in a

standard buck topology, the SS6580 features

a

high

voltage

CMOS

output

driver

with

short-circuit protection in an 8-pin package.

An external 4-bit Digital-to-Analog Converter (DAC)

can be used along with the SS6580 to adjust

the output voltage from 2.0V to 3.5V in 0.1V

increments. Table 1 on the following page

specifies the corresponding output voltage for 16

combinations of DAC inputs as shown in the

typical application circuit.

The 200 KHz switching frequency allows the use

of small external components while maintaining

high conversion efficiency. The 11MHz bandwidth

and the 6V/

µS slew rate of the error amplifier

ensure high converter bandwidth and fast transient

response.

The

SS6580

provides

both

adjustable

over-current and adjustable short-circuit protection

by sensing the output current across the on-

resistance of the external N-channel MOSFET,

rather than an external low value sense resistor.

The SS6580L provides a lower reference

voltage (1.30V) than the default SS6580

Rev.2.01 6/26/2003