Features and Benefits
- 5 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): 0.55 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: 5 nV/√Hz at 10 kHz; 4 nV/√Hz at 100 kHz
- Low dropout voltage: 59 mV typical at 5 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
- 61 dB typical at 10 kHz at 5 A load
- 43 dB typical at 100 kHz at 5 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
The ADP1765 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 5 A of output current (IOUT).
The low 59 mV typical dropout voltage at a 5 A load allows the ADP1765 to operate with a small headroom while maintaining regulation and providing better efficiency.
The ADP1765 is optimized for stable operation with small 22 µF ceramic output capacitors. The ADP1765 delivers optimal transient performance with minimal printed circuit board (PCB) area.
The ADP1765 is available in fixed output voltages ranging from 0.55 V to 1.5 V. The output voltage (VOUT) 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 ADP1765 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 ADP1765 is available in a small, 16-lead LFCSP package for the smallest footprint solution to meet a variety of 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
Markets and Technologies
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The ADP1764-1.0-EVALZ and ADP1765-1.0-EVALZ fixed
evaluation boards and the ADP1764-ADJ-EVALZ and ADP1765-
ADJ-EVALZ adjustable evaluation boards demonstrate the
functionality of the ADP1764 and the ADP1765 series of linear
Simple device measurements, such as line and load regulation, dropout voltage, and ground current, are demonstrated with only a single voltage supply, a voltmeter, an ammeter, and load resistors.
The ADP1764 fixed and adjustable evaluation boards are identical to the ADP1765.
For full details on the ADP1764 and the ADP1765 linear regulators, see the ADP1764 and the ADP1765 data sheets, which should be consulted in conjunction with this user guide when using these evaluation boards.
Features & Benefits
- Full featured evaluation boards for ADP1764 and ADP1765
- Input voltage range: 1.10 V to 1.98 V
- Output current range:
- ADP1764: 0 mA to 4 A
- ADP1765: 0 mA to 5 A
- Evaluation available on adjustable or fixed output voltage
- Convenient test points for electrical measurements
- Operating temperature range: −40°C to +125°C
Documentation & Resources
Linear Low Dropout (LDO) Regulator Solutions4/17/20183 M
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.