LM3280 Datasheet | National Semiconductor

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 20m A 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. Features - 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 - 300m A Maximum load capability (PWM mode) - 500m A 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 Applications - Cellular Phones - Hand-Held Radios - Battery Powered RF Devices Typical Application FIGURE 1. LM3280 Typical Application © 2007 National Semiconductor Corporation 201819 .national. Connection Diagrams Order Information 16- Bump Thin Micro SMD Package, Large Bump See NS Package Number TLA16QQA Order Number LM3280TL LM3280TLX LM3280TL-275 LM3280TLX-275 LM3280TL-280 LM3280TLX-280 LM3280TL-290 LM3280TLX-290 LDO3 Option 2.85V (Default) 2.85V (Default) 2.75V- 2.75V- 2.80V- 2.80V- 2.90V- 2.90V- Package Marking (Note) XYTT V001 XYTT V001 XYTT V002 XYTT V002 XYTT V003 XYTT V003 XYTT V004 XYTT V004 Supplied As 250 Units, Tape and Reel 3000 Units, Tape and...