Analog Devices Inc. ADP1765 Low Noise, CMOS Linear Regulators

Analog Devices Inc. ADP1765 Regulators are low noise, low dropout (LDO) CMOS linear regulators. ADP1765 Regulators operate from a single input supply with an input voltage as low as 1.10V. The regulators do not require an external bias supply to increase efficiency and deliver up to a 5A output current. The small package size and low 59mV dropout voltage at a 5A load allow the ADP1765 to operate in a minimal PCB area without compromising performance. Optimized for stable operation with small 22μF ceramic output capacitors, the ADP1765 Regulators achieve optimal transient performance. Analog Devices ADP1765 Regulators have an ultra-low 2μV_rms noise rating and ±1.5% fixed output voltage accuracy over line, load, and temperature. Thermal overload and short-circuit protection circuits prevent damage in adverse conditions.

Features

5A maximum output current
Low input voltage supply range
V_IN = 1.10V to 1.98V, no external bias supply required
0.55V to 1.5V fixed output voltage range
0.5V to 1.5V adjustable output voltage range
Ultra-low noise: 2μV_rms, 100Hz to 100kHz
Noise spectral density:
- 5nV/√Hz @ 10kHz
- 4nV/√Hz @ 100kHz
59mV typical @ 5A load dropout voltage
5mA typical @ no load operating supply current
±1.5% fixed output voltage accuracy over line, load, and temperature

Excellent power supply rejection ratio (PSRR) performance
- 61dB typical at 10 kHz @ 5A load
- 43dB typical at 100kHz @ 5A load
Excellent load/line transient response
Soft start to reduce inrush current
Optimized for small 22μF ceramic capacitors
Current-limit and thermal overload protection
Power-good indicator
Precision enable
16-lead, 3mm x 3mm LFCSP package

Applications

Regulation of Noise-Sensitive Applications
- 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