优势和特点

  Highly efficient low noise DC power supply system

  High efficiency buck for first stage conversion

  High PSRR, low noise LDO to remove switching ripple

  Adaptive LDO headroom control option for optimal efficiency and PSRR across full load range

  3 A Low-Noise Buck Regulator

  Wide Input Voltage Range: 4.2 V to 15 V

  Programmable Output Voltage Range: 0.6 V to 5 V

  < 40 uVrms Output Noise (Independent of output voltage)

  300 kHz to 2.5 MHz Internal clock with external sync up to

  26 MHz (factory programmable divider)

  3 A Low-Noise NFET LDO (Active Filter)

  Wide Input Voltage Range: 0.65 V to 5 V

  Fixed/Programmable Output Voltage Range: 0.6 V to 3.3 V

  Differential Point of Load Remote-Sensing

  < 10 uVrms Output Noise (independent of output voltage)

  PSRR > 50 dB (to 100 kHz) with 300 mV headroom at 3 A

  Ultra-Fast Transient Response

  Power Good Output

  Precision Enable Inputs for both the Buck Regulator and LDO

  −40 °C to +125 °C junction temperature

  32-lead 5 mm x 5 mm LFCSP Package

产品详情

ADP5003 integrates a high voltage buck regulator and an ultralow noise low dropout (LDO) regulator in a small 5mm x 5mm LFCSP 32 lead package to provide highly efficient and quiet regulated supplies.

The buck regulator is optimized to operate at high output currents up to 3 A. The LDO is capable of a maximum output current of 3 A and is designed to operate efficiently with low headroom voltage while maintaining high power supplyrejection for frequencies as high as 1MHz.

ADP5003 can be configured to operate in one of two modes. The adaptive mode allows the LDO to operate with a set headroom by adjusting the buck output voltage internally. Alternatively ADP5003 can operate in an independent modewhere both regulators operate separately from each other and where the output voltages are programmed using resistor dividers.

The LDO output voltage can be accurately controlled at the point of load (POL) using the remote sense which compensates for PCB trace impedance while delivering high output currents.

Each regulator is activated via a dedicated precision enable input. The buck switching frequency can be synchronized to an external signal, or programmed with an external resistor.

Safety features in the ADP5003 include thermal shutdown (TSD) and input undervoltage lockout (UVLO). The ADP5003 is rated for a −40°C to +125°C junction temperature range.

Applications

  Low noise power for High Speed ADC and DAC designs

  Powering RF Agile Transceiver and Clocking ICs