Datasheet > ADP7105ARDZ-1.8-R7

ADP7105ARDZ-1.8-R7

更新时间： 2024-11-23 12:34:23

品牌	Logo	应用领域
亚德诺 - ADI		稳压器软启动
页数	文件大小	规格书
28页	855K
描述
20 V, 500 mA, Low Noise LDO Regulator with Soft Start

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20 V, 500 mA, Low Noise LDO Regulator

with Soft Start

Data Sheet

ADP7105

FEATURES

TYPICAL APPLICATION CIRCUITS

Input voltage range: 3.3 V to 20 V

Maximum output current: 500 mA

= 5V

VIN

VOUT

= 8V

OUT

CIN

1µF

COUT

1µF

SENSE

Low noise: 15 µV rms for fixed output versions

PSRR performance of 60 dB at 10 kHz, V_OUT= 3.3 V

Reverse current protection

Low dropout voltage: 350 mV at 500 mA

Initial accuracy: 0.8%

100kΩ

EN/

UVLO

OFF

GND

CSS

Accuracy over line, load, and temperature: −2% to +1%

Low quiescent current: 900 μA at V_IN= 10 V, I_OUT= 500 mA

Low shutdown current: <50 µA at V_IN= 12 V, stable with small

1 µF ceramic output capacitor

3 fixed output voltage options: 1.8, 3.3 V and 5 V

Adjustable output from 1.22 V to 19 V

Programmable soft start for inrush current control

Foldback current-limit and thermal overload protection

User programmable precision UVLO/enable

Power-good indicator

Figure 1. ADP7105 with Fixed Output Voltage, 5 V

= 5V

VIN

VOUT

ADJ

= 8V

OUT

CIN

1µF

COUT

1µF

40.2kΩ

13kΩ

100kΩ

EN/

100kΩ

OFF

UVLO

GND

CSS

8-lead LFCSP and 8-lead SOIC packages

Figure 2. ADP7105 with Adjustable Output Voltage, 5 V

APPLICATIONS

Regulation of noise sensitive applications: ADC and DAC

circuits, precision amplifiers, high frequency oscillators,

clocks, and PLLs

Communications and infrastructure

Medical and healthcare

Industrial and instrumentation

GENERAL DESCRIPTION

The ADP7105 is a CMOS, low dropout (LDO)linear regulator

that operates from 3.3 V to 20 V and provides up to 500 mA of

output current. This high input voltage LDO is ideal for regula-

tion of high performance analog and mixed-signal circuits

operating from 1.22 V to 19 V rails. Using an advanced proprie-

tary architecture, the ADP7105 provides high power supply

rejection and low noise, and achieves excellent line and load

transient response with only a small 1 µF ceramic output

capacitor.

Note that throughout this data sheet, the sense function

(SENSE) of the SENSE/ADJ pin applies to fixed output voltage

models only, whereas the adjust input function (ADJ) applies to

adjustable output voltage models only. For example, Figure 1

shows the sense function, and Figure 2 shows the adjust input

function.

The ADP7105 output noise voltage is 15 μV rms and is inde-

pendent of the output voltage. A digital power-good output

allows power system monitors to check the health of the output

voltage. A user programmable precision undervoltage lockout

function facilitates sequencing of multiple power supplies.

The ADP7105 is available in three fixed output voltage options

and an adjustable version that allows output voltages ranging

from 1.22 V to 19 V via an external feedback divider. The

ADP7105 allows an external soft start capacitor to be connected

to program the startup.

The ADP7105 is available in 8-lead, 3 mm × 3 mm LFCSP

and 8-lead SOIC packages. The LFCSP offers a very compact

solution and provides excellent thermal performance for

applications that require up to 500 mA of output current in a

small, low profile footprint.

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

rightsof third parties that may result fromits 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 andregisteredtrademarks are the 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

www.analog.com

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