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ADP7185ACPZN3.3-R7

更新时间： 2024-11-30 02:47:03
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亚德诺 - ADI /
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19页 841K
描述
−500 mA, Ultralow Noise, High PSRR, Low Dropout Linear Regulator

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ADP7185ACPZN3.3-R7 数据手册

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−500 mA, Ultralow Noise, High PSRR,  
Low Dropout Linear Regulator  
ADP7185  
Data Sheet  
FEATURES  
TYPICAL APPLICATION CIRCUITS  
Input voltage range: −2.0 V to −5.5 V  
Maximum output current: −500 mA  
EP  
V
= –3.8V  
VIN  
VOUT  
V
= –3.3V  
IN  
OUT  
C
4.7µF  
C
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  
IN  
OUT  
4.7µF  
SENSE  
ADP7185  
+1.25V  
0V  
VA  
C
1µF  
C
OFF  
EN  
A
AFB  
10nF  
–1.3V  
ON  
VAFB  
VREG  
GND  
68 dB at 10 kHz  
50 dB at 100 kHz  
C
REG  
1µF  
40 dB at 1 MHz  
Figure 1. ADP7185 with Fixed Output Voltage, −3.3 V  
Low dropout voltage: −190 mV typical at −500 mA load  
Initial output voltage (VOUT) accuracy: 0.5ꢀ  
Output voltage accuracy over line, load, and temperature:  
2.2ꢀ  
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  
EP  
V
= –3V  
OFF  
VIN  
EN  
VOUT  
V
= –2.5V  
IN  
OUT  
C
4.7µF  
C
IN  
OUT  
4.7µF  
SENSE  
ADP7185  
+1.25V  
0V  
VA  
R1  
100kΩ  
C
A
1µF  
C
AFB  
10nF  
–1.3V  
ON  
VAFB  
R2  
24.9kΩ  
Current-limit and thermal overload protection  
8-lead, 2 mm × 2 mm LFCSP package  
Supported by ADIsimPOWER voltage regulator design tool  
VREG  
GND  
C
REG  
1µF  
Figure 2. ADP7185 with Adjustable Output Voltage, VOUT = −2.5 V  
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  
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.  
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.  
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.  
Rev. 0  
Document Feedback  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Technical Support  
©2017 Analog Devices, Inc. All rights reserved.  
www.analog.com  
 
 
 
 
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