DC-DC转换控制器 升压 ,500KHz固定工作频率升压转换器PT1301,

nCg嘉泰姆

GENERATION DESCRIPTIONnCg嘉泰姆

The PT1301 is a compact, hi gh 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 14 μ A low quiescent current together with high efficiency maintains long battery lifetime. FEATURES z Low Quiescent (Switch-off) Supply Current: 14 μ A z Low Start-up Input Voltage: typical 0.8V z High Supply Capability: Deliver 3.3V 100mA with 1Alkaline Cell; 5V 300mA with 1 Li-Cell z Zero Shutdown Mode Supply Current z High efficiency: 90% z Fixed switching frequency: 500KHz z Options for internal or external power switches z Package type: SOT-23-6, SOT-89-5,MSOP8 z RoHS compliant APPLICATIONS z MP3, PDA, Electronic z Dictionary, DSC, LCD, RF-Tag, z Portable Devices, Wireless Devices, etc.    
nCg嘉泰姆