The ADP1761 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 1 A of output current.
The low 30 mV typical dropout voltage at a 1 A load allows the ADP1761 to operate with a small headroom while maintaining regulation and providing better efficiency.
The ADP1761 is optimized for stable operation with small 10 μF ceramic output capacitors. The ADP1761 delivers optimal transient performance with minimal board area.
The ADP1761 is available in fixed output voltages ranging from 0.9 V to 1.5 V. The output 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 ADP1761 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 ADP1761 is available in a small 16-lead LFCSP package for the smallest footprint solution to meet a variety of applications.
**Applications**
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
### Features and Benefits
1 A maximum output current
Low input voltage supply range
VIN = 1.10 V to 1.98 V, no external bias supply required
Fixed output voltage range: VOUT_FIXED = 0.9 V to 1.5 V
Adjustable output voltage range: VOUT_ADJ = 0.5 V to 1.5 V
Ultralow noise: 2 μV rms, 100 Hz to 100 kHz
Noise spectral density
4 nV/√Hz at 10 kHz
3 nV/√Hz at 100 kHz
Low dropout voltage: 30 mV typical at 1 A load
Operating supply current: 4.5 mA typical at no load
±1.5% fixed output voltage accuracy over line, load, and temperature
Excellent power supply rejection ratio (PSRR) performance
