ADP1764 Datasheet

• 4 A maximum output current
• Low input voltage supply range
  • V_IN = 1.10 V to 1.98 V, no external bias supply required
• Fixed output voltage range (V_{OUT_FIXED}): 0.55 V to 1.5 V
• Adjustable output voltage range (V_{OUT_ADJ}): 0.5 V to 1.5 V
• Ultralow noise: 2 µV rms, 100 Hz to 100 kHz
• Noise spectral density: 5 nV/√Hz at 10 kHz; 4 nV/√Hz at 100 kHz
• Low dropout voltage: 47 mV typical at 4 A load
• Operating supply current: 5 mA typical at no load 
• ±1.5% fixed output voltage accuracy over line, load, and temperature
• Excellent power supply rejection ratio (PSRR) performance
  • 69 dB typical at 10 kHz at 4 A load
  • 46 dB typical at 100 kHz at 4 A load 
• Excellent load/line transient response
• Soft start to reduce inrush current
• Optimized for small 22 µF ceramic capacitors
• Current-limit and thermal overload protection
• Power-good indicator
• Precision enable
• 16-lead, 3 mm × 3 mm LFCSP package

• Regulation to noise sensitive applications such as radio frequency (RF) transceivers, analog-to-digital converter (ADC) and digital-to-analog converter (DAC) circuits, phase-locked loops (PLLs), voltage controlled oscillators (VCOs) and clocking integrated circuits
• Field-programmable gate array (FPGA) and digital signal processor (DSP) supplies
• Medical and healthcare
• Industrial and instrumentation

The ADP1764 is a low noise, low dropout (LDO) linear regulator. It is designed to operate from a single input supply with an input voltage as low as 1.10 V without the requirement of an external bias supply to increase efficiency and provide up to 4 A of output current (I_OUT).

The low 47 mV typical dropout voltage at a 4 A load allows the ADP1764 to operate with a small headroom while maintaining regulation and providing better efficiency.

The ADP1764 is optimized for stable operation with small 22 μF ceramic output capacitors. The ADP1764 delivers optimal transient performance with minimal printed circuit board (PCB) area.

The ADP1764 is available in fixed output voltages ranging from 0.55 V to 1.5 V. The output voltage (V_OUT) of the adjustable output model can be set from 0.5 V to 1.5 V through an external resistor connected between VADJ and ground.

The ADP1764 has an externally programmable soft start time by connecting a capacitor to the SS pin. Short-circuit and thermal overload protection circuits prevent damage in adverse conditions. The ADP1764 is available in a small, 16-lead LFCSP package for the smallest footprint solution to meet a variety of applications.