LM3280
www.ti.com SNOSAU4B – OCTOBER 2006 – REVISED FEBRUARY 2013 LM3280 Adjustable Step-Down DC-DC Converter and 3 LDOs for RF Power Management
Check for Samples: LM3280 FEATURES DESCRIPTION The LM3280 is a multi-functional Power Management
Unit, optimized for low-power handheld applications
such as Cellular Phones. 1 2 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) DCDC
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 DSBGA Package
Current Overload Protection
Thermal Overload Protection 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 …
