LM3280 Adjustable Step-Down DC-DC Converter and 3 LDOs for RF Power Management
January 2007
LM3280 Adjustable Step-Down DC-DC Converter and 3 LDOs for RF Power Management
General Description
The LM3280 is a multi-functional Power Management Unit, optimized for low-power handheld applications such as Cellular Phones.
The LM3280 incorporates three low-dropout LDO voltage
regulators and one step down PWM DC-DC converter with an internal Bypass FET.
The step down converter's output voltage can be set using an analog input (VCON) for optimizing efficiency of the RF PA at various power levels.
The LDO operates a nominal output voltage of 2.
85V and maximum load current capability of 20mA for a r...