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ST755

ADJUSTABLE INVERTING NEGATIVE OUTPUT CURRENT MODE PWM REGULATORS

STMicroelectronics 

®

ST755

ADJUSTABLE INVERTING NEGATIVE OUTPUT

CURRENT MODE PWM REGULATORS

s 2.7V TO 11V INPUT TO ADJUSTABLE

NEGATIVE OUTPUT CONVERSION

s 1W GUARANTEED OUTPUT POWER

(Vin>4.5V, T≤70oC)

s 68% TYP. EFFICENCY AT 6V

s VERY LOW QUIESCENT CURRENT: 1.2mA

IN ON MODE 10µA IN SHUT DOWN MODE

s SOFT START

s VERY LOW NOISE OUTPUT

s 160KHz FIXED FREQUENCY OSCILLATOR

s MIXED BIPOLAR-CMOS TECHNOLOGY

DESCRIPTION

The ST755 is an adjustable inverting

switch-mode DC-DC rergulator with internal

Power MOSFET that generaters an adjustable

negative output from a voltage input of 2.7V to

11V, output current guaranteed at 200mA (for

DIP-8

SO-8

Vin>4.5V, Vout = -5V and 0oC ≤ Ta ≤ 70oC) and

275mA (typical value at Ta = 25 oC, Vout = -5V).

A logic controlled shut down pin that interfaces

directly with microprocessor reduces supply

current to only 10µA. Input to Output differential

voltage is limited to Vin+|Vout|<12.7V. No load

supply current is 1.2mA.

BLOCK DIAGRAM

September 1998

1/9

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