Alternative Parts
Overview
Features and Benefits
- Input voltage range: −2.0 V to −5.5 V
- Maximum output current: −500 mA
- Fixed output voltage options: −0.5 V to −4.5 V
- Adjustable output from −0.5 V to −VIN + 0.5 V
- Low output noise: 4 μV rms from 100 Hz to 100 kHz
- Noise spectral density: 20 nV/√Hz, 10 kHz to 1 MHz
- PSRR at −500 mA load
- 68 dB at 10 kHz
- 50 dB at 100 kHz
- 40 dB at 1 MHz
- Low dropout voltage: −190 mV typical at −500 mA load
- Initial output voltage (VOUT) accuracy: ±0.5%
- Output voltage accuracy over line, load, and temperature: ±2.2%
- Operating supply current (IGND): −0.6 mA typical at no load
- Low shutdown current: −2 μA typical at VIN = −5.5 V
- Stable with small 4.7 μF ceramic input and output capacitor
- Positive or negative enable logic
- Current-limit and thermal overload protection
- 8-lead, 2 mm × 2 mm LFCSP package
- Supported by ADIsimPOWER voltage regulator design tool
Product Details
The ADP7185 is a complementary metal oxide semiconductor (CMOS), low dropout (LDO) linear regulator that operates from −2.0 V to −5.5 V and provides up to −500 mA of output current. This high output current LDO is ideal for regulation of high performance analog and mixed signal circuits operating from −0.5 V down to −4.5 V. Using an advanced proprietary architecture, the ADP7185 provides high power supple rejection ratio (PSRR) and low noise, and it achieves excellent line and load transient response with a small 4.7 μF ceramic output capacitor.
The ADP7185 is available in 15 fixed output voltage options. The following voltages are available from stock: −0.5 V, −1.0 V, −1.2 V, −1.5 V, −1.8 V, −2.0 V, −2.5 V, −3.0 V, and −3.3 V.
Additional voltages available by special order are −0.8 V, −0.9 V, −1.3 V, −2.8 V, −4.2 V, and −4.5 V. An adjustable version is also available which allows output voltages that range from −0.5 V to −VIN + 0.5 V with an external feedback divider.
The enable logic feature is capable of interfacing with positive or negative logic levels for maximum flexibility.
The ADP7185 regulator output noise is 4 μV rms independent of the output voltage. The ADP7185 is available in an 8-lead, 2 mm × 2 mm LFCSP, making it not only a very compact solution but also providing excellent thermal performance for applications requiring up to −500 mA of output current in a small, low profile footprint.
Applications
- Regulation to noise sensitive applications: analog-to-digital converters (ADCs), digital-to-analog converters (DACs), precision amplifiers
- Communications and infrastructure
- Medical and healthcare
- Industrial and instrumentation
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)
Tools & Simulations
LTpowerCAD
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Design tools for the following parts are available in LTpowerCAD:
Reference Materials
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StudentZone Articles (1)
Rarely Asked Questions (1)
Design Resources
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