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ST735S

ST735T

300kHz, -5V/ADJ INVERTING, NEGATIVE OUTPUT

CURRENT-MODE PWM REGULATOR

s

s

s

s

s

s

s

s

s

s

s

CONVERTS +4.0V TO + 6.2V INPUT TO -5V

OUTPUT (735S) OR +3.5V TO + 9.0V TO A

NEGATIVE ADJUSTABLE OUTPUT (735T)

1W GUARANTEED OUTPUT POWER

72% TYPICAL EFFICIENCY

0.8mA QUIESCENT CURRENT

1碌A(chǔ) SHUTDOWN MODE

300KHZ FIXED FREQUENCY OSCILLATOR

CURRENT MODE PWM CONVERTER

LOW NOISE AND JITTER

SOFT START

SIMPLE APPLICATION CIRCUIT

UNDERVOLTAGE LOCKOUT (735S)

DIP-8

SO-8

DESCRIPTION

The ST735S/ST735T is a Bi-CMOS, inverting

switch mode DC-DC regulator with internal Power

MOSFET that generates a fixed -5V (S version) or

a negative adjustable (T version) output voltage

from a 4V (3.5V for the 735T) to 6.2V input voltage

(9V for the 735T); is guaranteed an output current

of 200mA for inputs greater than 4.5V. The

quiescent current for this device is typically of

SCHEMATIC DIAGRAM

0.8mA and, in shutdown mode it is reduced to

1碌A(chǔ).

These power-conserving features, along with high

efficiency and applications circuits, thaT lend itself

to minaturization, make the ST735S/ST735T

excellent in a broad range of on-card, HDD and

portable equipment applications. These device

employ a high performance current mode pulse

with modulation (PWM) control scheme to provide

tight output voltage regulation and low noise. The

fixed frequency oscillator is factory trimmed to

300KHz, allowing for easy noise filtering. The

regulator in production is tested to guarantee an

output accuracy within 鹵5% over all specified

conditions.

October 2002

1/11

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