MIC2807中文资料DAC Controlled 2MHz 600mA DC/DC + Dual Low Noise 200mA/30mA LDOs数据手册Microchip规格书

描述 Description

The MIC2807 integrates a high performance DC/DC converter intended for powering a power amplifier (PA) in a mobile phone with dual low noise low dropout (LDO) regulators for the rest of the RF section. Optimized for low noise performance, the MIC2807 improves efficiency in the handset without compromising quality.The MIC2807 has a 2MHz, constant frequency pulse width modulated (PWM) DC/DC converter designed for low noise operation and high efficiency. The output voltage (VOUT) is variable from 0.3V to the input voltage (VIN), adjustable from 0.3V to 3.6V through a DAC input when VIN > VOUT. The converter will work in a 100% duty cycle mode to offer maximum power and efficiency in the application. In addition to 100% duty cycle, the DC/DC converter has a bypass mode of operation where the input voltage node (PVIN pin) is shorted to the output voltage node (OUT pin) through a 95mΩ switch.The integrated dual low noise low dropout regulators are optimized for high PSRR capability and fast turn-on times. The constant frequency DC/DC converter along with dual low noise LDO regulators enables a very quiet and efficient solution for mobile applications.The MIC2807 is a µCap design, operating with small ceramic output capacitors and inductors for stability, reducing required board space and component cost..

特性 Features

• 2.7V to 5.5V input voltage range
• Stable with ceramic output capacitors
• Thermal shutdown protection
• Current limit protection
• VOUT = VDAC x 3
• Internal 95mΩ switch between PVIN and OUT pins
• V DAC >1.2V
• Up to 600mA output current in PWM mode
• 100% duty cycle operation for maximum efficiency
• Tiny 4.7µH, 1µF output inductor and capacitor
• Low-noise 2MHz PWM operation
• >90% efficiency
• High accuracy: ±2% over temperature
• High PSRR: greater than 70dB
• Very low output noise: 32 µVrms
• LDO1: 200mA output current capability
• LDO2: 30mA output current capability

简介

MIC2807属于RF/IF射频/中频RFID的RFIC模块。由制造生产的MIC2807RF 其它 IC 和模块RF 其它 IC 和模块产品系列包含各种独特、专门或特定用途的产品，可与 RF、IF 和微波无线电应用结合使用。示例包括 AM/FM 调谐器和接收器、偏置网络、基带处理器、计数器、数字可调电容器、下变频器、倍频器、移相器、前置分频器、端接器、上变频器、VCO 等。