RF6280

Preliminary RF6280 POWER MANAGEMENT IC Package Style: 15-Bump WLCSP, 4x4 Array, 2mmx2mm Features „ Peak Efficiency Up To 96% „ High Efficiency Over Various Loads „ Transient Response <10μs „ 650mA Current Capability „ Variable Output Voltage (0V to VBATT) „ 2.5MHz PWM Switching Fre- quency „ Automatic Bypass Mode „ Over Temperature Shutdown „ Current Limit „ Analog Bias Control (Auto- matic and Buffer) „ Three Individual Fast Tran- sient 2.85V LDOs „ Controls up to 3 UMTS PAs „ Small, Wafer-Level, Chip- Scale Package Applications „ W-CDMA Handsets Functional Block Diagram Product Description The RF6280 is a multi-functional Power Management IC which is used in conjunction with power amplifiers and designed to be used in 3V handheld systems. The RF6280 consists of a Pulse Width Modulated (PWM) voltage mode DC-DC converter, three 2.85V LDOs, and analog 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 programmed (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...