021-54278989
High Efficiency, Low Voltage Step-up DC/DC Converter GENERAL DESCRIPTION The PT1301 is a compact, high efficiency, and low voltage step-up
DC/DC converter with an Adaptive Current Mode PWM control loop. It
comprises of an error amplifier, a ramp generator, a PWM
comparator, a switch pass element and the driver. It provides
stable and high efficient operation over a wide range of load
currents without external compensation. The below 1V start-up input
voltage makes PT1301 suitable for single battery cell applications.
The built-in power transistor is able to provide up to 300mA output
current while working under Li-Battery Supply. Besides, it provides
extra pin to drive external power devices (NMOS or NPN ) in case
higher output current is needed. The output voltage is set with two
external resistors. The 500KHz high switching rate reduces the size
of external components. Besides, the 14A low quiescent current
together with high efficiency maintains long battery lifetime. FEATURES Low Profile SOT Package Low Quiescent (Switch-off) Supply Current: 14A Low Start-up Input Voltage: typical 0.8V High Supply Capability: Deliver 3.3V 100mA with 1Alkaline Cell; 5V 300mA with 1 Li-Cell Zero Shutdown Mode Supply Current High efficiency: 90% Fixed switching frequency: 500KHz Options for internal or external power switches Package type: SOT-26, SOT-89-5 APPLICATIONS MP3 Player PDA Electronic Dictionary DSC LCD RF-Tag Portable Devices Wireless Devices TYPICAL APPLICATION |
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