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 0.8mA and, in shutdown mode it is reduced to 1µA.

■ 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

■ 1µA SHUTDOWN MODE

■ 300KHZ FIXED FREQUENCY OSCILLATOR

■ CURRENT MODE PWM CONVERTER

■ LOW NOISE AND JITTER

■ SOFT START

■ SIMPLE APPLICATION CIRCUIT

■ UNDERVOLTAGE LOCKOUT (735S)