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 converters 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 reference voltage required by linear RF power amplifiers. The LM3280 additionally features a separate enable pin for each output.
The LM3280 is available in a 16-pin lead free micro SMD package.
■ 2MHz (typ.) PWM Switching Frequency
■ Operates from a single Li-Ion cell (2.7V to 5.5V)
■ Adjustable Output Voltage (0.8V to 3.6V) DC-DC
■ High-efficiency synchronous buck converter
■ 300mA Maximum load capability (PWM mode)
■ 500mA Maximum load capability (Bypass mode)
■ PWM, Forced and Automatic Bypass Mode
■ 3 Low-dropout and fast transient response LDOs
■ 16-pin micro SMD Package
■ Current Overload Protection
■ Thermal Overload Protection
■ Cellular Phones
■ Hand-Held Radios
■ Battery Powered RF Devices