PT1101
PWM/VFM Step-down DC-DC Controller
GENERAL DESCRIPTION
The PT1101 Series are CMOS-based PWM step-down DC/DC Controllers with low supply current.
A low ripple, high efficiency step-down DC/DC converter can be easily composed of with additional several external components such as a power-
transistor, an inductor, a diode and capacitors.
Output voltage is fixed or can be adjusted with external resisters.
(PWM/VFM alternative circuit is disabled in adjustable types) The PT1101 Series consist of a PWM control circuit, a high precision band-gap voltage reference, a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, an oscillator, an error amplifier with internal compe...