详细描述
The RF6280 is a multi-functional Power Management Unit which is used in conjunction with power amplifiers and designed to be used in 3V handheld systems. The RF6280 consists of a DC-DC converter three 2.85V LDOs and a bias control circuit to adjust the PA bias. The DC-DC Converter is a buck converter that provides high efficiency over a wide output voltage range with minimal ripple. It has a fast response to load and line transients and fast response to program (VSET) voltage changes. The converter includes an auto-bypass function which allows the handset to operate at lower battery voltage while helping maintain PA linearity at maximum output power. The converter output voltage is set by a variable control voltage VSET. The RF6280 has three individual LDOs which are enabled by a digital two bit logic signal. The three LDO outputs are used for band select in tri-band WCDMA handsets.
特点
Peak Efficiency Up To 96%
High Efficiency Over Various Loads
Transient Response <10
650mA Current Capability
Variable Output Voltage (0V to VBATT)
2.5MHz PWM Switching Frequency
Automatic Bypass Mode
Over Temperature Shutdown
Current Limit
Analog Bias Control (Automatic and Buffer)
Three Individual Fast Transient 2.85V LDOs
Controls up to 3 UMTS PAs
Small Wafer-Level Chip-Scale Package