ST755 Datasheet, PDF (1/9 Pages) STMicroelectronics – ADJUSTABLE INVERTING NEGATIVE OUTPUT CURRENT MODE PWM REGULATORS

®
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≤70^oC)
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
V_in>4.5V, V_out = -5V and 0^oC ≤ Ta ≤ 70^oC) and
275mA (typical value at T_a = 25 ^oC, V_out = -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