ADP1822ARQZ-R7 Datasheet ADP1822ARQZ-R7 | P1-P3

PWM, Step-Down DC-to-DC Controller

with Margining and Tracking

Data Sheet

ADP1822

Rev. D

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FEATURES

Wide power input voltage range: 1 V to 24 V

Chip supply voltage range: 3.7 V to 5.5 V

Wide output voltage range: 0.6 V to 85% of input voltage

1% accuracy, 0.6 V reference voltage

Output voltage margining control

Output voltage tracking

All N-channel MOSFET

300 kHz, 600 kHz, or up to 1.2 MHz synchronized frequency

No current sense resistor required

Power-good output

Programmable soft start with reverse current protection

Current-limit protection

Thermal overload protection

Overvoltage protection

Undervoltage lockout

1 µA shutdown supply current

Small, 24-lead QSOP package

APPLICATIONS

Telecommunications and networking systems

High performance servers

Medical imaging systems

DSP core power supplies

Microprocessor core power supplies

Mobile communication base stations

Distributed power

GENERAL DESCRIPTION

The ADP1822 is a versatile and inexpensive synchronous voltage-

mode PWM step-down controller. It drives an all N-channel power

stage to regulate an output voltage as low as 0.6 V.

The ADP1822 regulated output can track another power supply

and can be dynamically adjusted up or down with the controller’s

margining-control inputs, making it ideal for high reliability

applications. It is well suited for a wide range of high power

applications, such as DSP power and processor core power in

telecommunications, medical imaging, high performance

servers, and industrial applications. It operates from a 3.7 V to

5.5 V supply with power input voltage ranging from 1.0 V to 24 V.

The ADP1822 can operate at any frequency between 300 kHz

and 1.2 MHz, either by synchronizing with an external source

or an internally generated, logic-controlled clock of 300 kHz or

600 kHz. It includes an adjustable soft start to allow sequencing

and quick power-up while preventing input inrush current. Output

reverse-current protection at startup prevents excessive output

voltage excursions. The adjustable, virtually lossless current-

limit scheme reduces external part count and improves efficiency.

The ADP1822 operates over the −40°C to +125°C junction

temperature range and is available in a 24-lead QSOP package.

LOAD CURRENT (A)

EFFICIENCY (%)

2 4 6 8 10 12 14

1.8V OUTPUT

3.3V OUTPUT

05311-006

Figure 1. Efficiency vs. Load Current, 5 V Input

BIAS INPUT

1µF

10Ω

FREQ

SYNC

MAR

MSEL

COMP

100nF

IRF3711

1µH

180µF

20V

1000µF

BST

PGND

TRKP

TRKN

MDN

MUP

0.1µF

PVCC

ADP1822

6.18kΩ

POWER INPUT

2.25V TO 24V

05311-001

OUTPUT

1.8V, 15A

1µF

80.6kΩ

309pF

AGND

DGND

TRACKING

SIGNAL INPUT

2.2pF

1nF

15pF

158kΩ

316kΩ

CMOSH-3

20kΩ

10kΩ

VCC

PWGD

CSL

SHDN

Figure 2. Typical Operating Circuit

ADP1822* PRODUCT PAGE QUICK LINKS

Last Content Update: 02/23/2017

COMPARABLE PARTS

View a parametric search of comparable parts.

EVALUATION KITS

• ADP1822 Evaluation Board

DOCUMENTATION

Data Sheet

• ADP1822: PWM, Step-Down DC-to-DC Controller with

Margining and Tracking Data Sheet

Product Highlight

• DC-to-DC Switching Regulator IC Solutions (10/06)

User Guides

• UG-366: Evaluation Board for PWM, Step-Down DC-to-DC

Controller with Margining and Tracking

TOOLS AND SIMULATIONS

• ADIsimPower™ Voltage Regulator Design Tool

• ADP182x Buck Designer Tool

DESIGN RESOURCES

• ADP1822 Material Declaration

• PCN-PDN Information

• Quality And Reliability

• Symbols and Footprints

DISCUSSIONS

View all ADP1822 EngineerZone Discussions.

SAMPLE AND BUY

Visit the product page to see pricing options.

TECHNICAL SUPPORT

Submit a technical question or find your regional support

number.

DOCUMENT FEEDBACK

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ADP1822 Data Sheet

Rev. D | Page 2 of 24

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

Absolute Maximum Ratings ............................................................ 5

ESD Caution .................................................................................. 5

Simplified Block Diagram ............................................................... 6

Pin Configuration and Function Descriptions ............................. 7

Typical Performance Characteristics ............................................. 9

Theory of Operation ...................................................................... 12

Current-Limit Scheme ............................................................... 12

Output Voltage Margining ........................................................ 12

Output Voltage Tracking ........................................................... 12

Soft Start ...................................................................................... 12

High-Side Driver (BST and DH) .............................................. 13

Low-Side Driver (DL) ................................................................ 13

Input Voltage Range ................................................................... 13

Setting the Output Voltage ........................................................ 13

Switching Frequency Control ................................................... 13

Compensation ............................................................................. 13

Power-Good Indicator ............................................................... 13

Shutdown Control ...................................................................... 13

Application Information ................................................................ 14

Selecting the Input Capacitor ................................................... 14

Output LC Filter ......................................................................... 14

Selecting the MOSFETS ............................................................ 15

Setting the Current Limit .......................................................... 15

Feedback Voltage Divider ......................................................... 16

Setting the Voltage Margin ........................................................ 16

Compensating the Regulator .................................................... 16

Setting the Soft Start Period ...................................................... 18

Synchronizing the Converter .................................................... 19

Setting the Output Voltage Tracking ....................................... 19

Application Circuits ....................................................................... 20

Outline Dimensions ....................................................................... 21

Ordering Guide .......................................................................... 21

REVISION HISTORY

12/11—Rev. C to Rev. D

Updated Outline Dimensions ....................................................... 21

Changes to Ordering Guide .......................................................... 21

5/07—Re v. B to Rev. C

Changes to Features .......................................................................... 1

Changes to General Description .................................................... 1

Changes to Specifications Section .................................................. 3

Changes to Table 2 ............................................................................ 5

Changes to Theory of Operation Section .................................... 12

Changes to Current Limit Scheme Section ................................. 12

Changes to Setting the Current Limit Section ............................ 15

Changes to Ordering Guide .......................................................... 21

8/06—Rev. A to Rev. B

Change to Title .................................................................................. 1

Change to General Description ...................................................... 1

Changes to Figure 6 .......................................................................... 9

Changes to Output Voltage Margining Section .......................... 12

Changes to Table 4 .......................................................................... 12

1/06—Re v. 0 to Re v. A

Changes to Figure 1 ........................................................................... 1

Changes to Table 1 ............................................................................. 3

Changes to Input Voltage Range Section .................................... 13

Changes to Selecting the Input Capacitor Section ..................... 14

Added Equation 1; Renumbered Sequentially ........................... 14

Changes to Equation 7 and Equation 8 ....................................... 15

Changes to Selecting the MOSFETS Section .............................. 15

Added Equation 9; Renumbered Sequentially ........................... 15

Changes to Equation 10 ................................................................. 15

Changes to Equation 22 ................................................................. 17

Changes to Compensating the Regulator Section ...................... 17

Changes to Figure 19 and Figure 20............................................. 17

Changes to Equation 27 ................................................................. 17

Changes to Equation 34 ................................................................. 18

7/05—Revision 0: Initial Version

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P25

ADP1822ARQZ-R7

Mfr. #:

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Manufacturer:

Analog Devices / Linear Technology

Description:

Switching Controllers 20Amp Buck Controller With tracking

Lifecycle:

New from this manufacturer.

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ADP1822ARQZ-R7