DC-to-DC Controller. ADP1822 Datasheet

ADP1822 Controller. Datasheet pdf. Equivalent


Analog Devices ADP1822
Data Sheet
PWM, Step-Down DC-to-DC Controller
with Margining and Tracking
ADP1822
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.
97
96
3.3V OUTPUT
95
94
93
92 1.8V OUTPUT
91
90
89
88
87
0 2 4 6 8 10 12 14
LOAD CURRENT (A)
Figure 1. Efficiency vs. Load Current, 5 V Input
16
BIAS INPUT
5V
1µF
15pF
80.6kΩ
309pF
CMOSH-3
10Ω
1µF
VCC PVCC BST
ADP1822 DH
SHDN
FREQ
SYNC
PWGD
SW
CSL
DL
PGND
MAR
MSEL
FB
TRKP
TRKN
COMP
MDN
SS AGND DGND MUP
100nF
0.1µF
6.18kΩ
2.2pF
1nF
158kΩ
316kΩ
IRF3711
1µH
IRF3711
Figure 2. Typical Operating Circuit
180µF
20V
POWER INPUT
2.25V TO 24V
20kΩ
OUTPUT
1000µF 1.8V, 15A
4V
10kΩ
TRACKING
SIGNAL INPUT
Rev. D
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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ADP1822 Datasheet
Recommendation ADP1822 Datasheet
Part ADP1822
Description Step-Down DC-to-DC Controller
Feature ADP1822; Data Sheet PWM, Step-Down DC-to-DC Controller with Margining and Tracking ADP1822 FEATURES Wide po.
Manufacture Analog Devices
Datasheet
Download ADP1822 Datasheet




Analog Devices ADP1822
ADP1822* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
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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
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Analog Devices ADP1822
ADP1822
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
REVISION HISTORY
12/11—Rev. C to Rev. D
Updated Outline Dimensions ....................................................... 21
Changes to Ordering Guide .......................................................... 21
5/07—Rev. 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
Data Sheet
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
1/06—Rev. 0 to Rev. 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
Rev. D | Page 2 of 24







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