来源：芯片解密-龙芯世纪 时间：2011-04-14 阅读：948次
2 MHz (typ.) PWM Switching Frequency
Operates from a single Li-Ion cell (2.7V to 5.5V)
Variable Output Voltage (0.8V to 3.6V)
300mA Maximum load capability (PWM mode)
500mA Maximum load capability (Bypass mode)
PWM, Forced and Automatic Bypass Mode
High Efficiency (96% Typ at 3.6VIN, 3.2VOUT at 120mA) from internal synchronous rectification
10-pin micro SMD Package
Current Overload Protection
Thermal Overload Protection
RF PC Cards
Battery Powered RF Devices
The LM3200 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single Lithium-Ion cell. It steps down an input voltage of 2.7V to 5.5V to a variable output voltage of 0.8V to 3.6V. The output voltage is set using an analog input ( VCON) for optimizing efficiency of the RF PA at various power levels.
The LM3200 offers superior features and performance for mobile phones and similar RF PA applications. Fixedfrequency PWM mode minimizes RF interference. Bypass mode turns on an internal bypass switch to power the PA directly from the battery. LM3200 has both forced and automatic bypass modes. Shutdown mode turns the device off and reduces battery consumption to 0.1μA (typ.). The LM3200 is available in a 10-pin lead free micro SMD package.
A high switching frequency (2 MHz) allows use of tiny surface-mount components. Only three small external surface-mount components, an inductor and two ceramic capacitors are required.