PWM/PFM,500KHz,降压控制器,降压控制器PT1101

  PT1101_DS Rev EN_2.0 PT1101 GENERAL DESCRIPTION2D7嘉泰姆

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 altern ative 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 circ uit, an oscillator, an erro r amplifier with internal compensation network and input/output voltage detection circuits.   With its internal state-of-art cont rol algorithm, the PT1101 Series ba sed DC/DC converter can achieve high performance while maintaining stability. For example, with its PWM/VFM alternative circu it, 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 prot ection circuits restart the operation with soft-start and repeat until the maximum duty cycle condition is rel eased. 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 z Wide Range Of Input Voltage:    2.5V~18V z Built-in Soft-start and Protection Function z High Efficiency:  Typ. 90% z Oscillation Frequency:    500kHz z High Accuracy Output Voltage:    ±2% z Low Temperature Coefficient of Output Voltage:   Typ. ±100ppm/ °C z RoHS compliant z Standby Current:  Typ. 0.1μA z Output Voltage:  Stepwise Setting with a step of 0.1V in the range of 1.2V to 6.0V as fixed voltage type. Reference Voltage of Adjustable type is 1.0V. z Small Package:  SOT-23-5 z CMOS Output Capability    
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