PT1101 Datasheet | PowTech

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 posed of with additional several external ponents 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 pensation network and input/output voltage detection circuits. With its internal state-of-art control algorithm, the PT1101 Series based DC/DC converter can achieve high performance while maintaining stability. For example, with its PWM/VFM alternative circuit, when the load current is small, the operation is automatically switched into the VFM mode to improve the efficiency. Further, if the term of maximum duty cycle keeps on a certain time, the embedded protection circuits restart the operation with soft-start and repeat until the maximum duty cycle condition is released. Finally, built-in UVLO function blocks potentially unstable output when the input voltage is equal or less than UVLO threshold and makes this IC standby for low power consumption. - Features - - - - - - - - Wide Range Of Input Voltage: High Efficiency: Typ. 90% Oscillation Frequency: 500k Hz 2.3V~18V Built-in Soft-start and Protection Function - APPLICATIONS Power Sources For: - - - Hand-held munication equipment, cameras, video instruments such as VCRs, camcorders Battery-powered equipment Household electrical appliances High Accuracy Output Voltage: ±2% Low Temperature Coefficient of Output Voltage: Typ. ±100ppm/℃ Standby Current: Typ. 0.1µA Output Voltage: Stepwise Setting with a step of 0.1V in the...