The PT1201 is a high efficiency monolithic current mode synchronous buck regulator with a constant operation frequency. A main switch and a synchronous switch are integrated in PT1201, the device has high efficiency and no external Schottky diode needed. Supply current is 300uA during operation and drops to ≤1μA in shutdown. The 2.5V to 5.5V input voltage range makes the PT1201 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Automatic skip cycle operation mode at light loads provides very low output ripple for noise sensitive applications. Internal 1.9MHz switching frequency allowing the use of small surface mount inductors and capacitors. Ultra low output voltages are easily available with the 0.5V feedback reference voltage. The PT1201 is offered in a low profile SOT package and is available in an adjustable version and fixed output voltages versions from 0.5v to 1.8v.
FEATURES
l High Efficiency: Up to 96%
l Low Quiescent Current: 300μA
l 800mA Output Current
l 2.5V to 5.5V Input Voltage Range
l 1.9MHz Constant Frequency Operation
l Internal integrated main switch and rectifier, no Schottky Diode Required
l Low Dropout Operation: 100% Duty Cycle
l 0.5V Reference Allows Low Output Voltages
l Shutdown Mode Draws≤1μA Supply Current
l Current Mode Operation for Excellent Line and Load Transient Response
l Over-temperature Protected
l Low Profile SOT Package
APPLICATIONS
l Cellular and Smart Phones
l Personal Information Appliances
l Microprocessors and DSP Core Supplies
l Wireless and DSL Modems
l Digital Still Cameras
l MP3 Players and PDAs
l Portable Instruments
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