ADP7185ACPZN3.3-R7 datasheet(1/19 Pages) AD

部件名	ADP7185ACPZN3.3-R7

功能描述	??00 mA, Ultralow Noise, High PSRR, Low Dropout Linear Regulator

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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−500 mA, Ultralow Noise, High PSRR,

Low Dropout Linear Regulator

Data Sheet

ADP7185

Rev. 0

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FEATURES

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

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

TYPICAL APPLICATION CIRCUITS

VOUT = –3.3V

COUT

4.7µF

CA

1µF

CAFB

10nF

+1.25V

0V

–1.3V

OFF

ON

VIN

EN

VREG

GND

VOUT

SENSE

VA

VAFB

CIN

4.7µF

VIN = –3.8V

CREG

1µF

ADP7185

EP

Figure 1. ADP7185 with Fixed Output Voltage, −3.3 V

VOUT = –2.5V

COUT

4.7µF

+1.25V

0V

–1.3V

OFF

ON

VIN

EN

VREG

GND

VOUT

SENSE

VA

VAFB

CIN

4.7µF

VIN = –3V

CREG

1µF

ADP7185

CA

1µF

CAFB

10nF

R2

24.9kΩ

R1

100kΩ

EP

Figure 2. ADP7185 with Adjustable Output Voltage, VOUT = −2.5 V

GENERAL DESCRIPTION

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.

类似零件编号 - ADP7185ACPZN3.3-R7

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