ADP1822 Controller Datasheet

ADP1822 Datasheet, PDF, Equivalent


Part Number

ADP1822

Description

Step-Down DC-to-DC Controller

Manufacture

Analog Devices

Total Page 25 Pages
Datasheet
Download ADP1822 Datasheet


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
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.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2006–2011 Analog Devices, Inc. All rights reserved.

ADP1822
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
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SAMPLE AND BUY
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TECHNICAL SUPPORT
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number.
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Features Data Sheet PWM, Step-Down DC-to-DC Cont roller with Margining and Tracking ADP1 822 FEATURES Wide power input voltage range: 1 V to 24 V Chip supply voltage range: 3.7 V to 5.5 V Wide output volta ge range: 0.6 V to 85% of input voltage 1% accuracy, 0.6 V reference voltage O utput voltage margining control Output voltage tracking All N-channel MOSFET 3 00 kHz, 600 kHz, or up to 1.2 MHz synch ronized frequency No current sense resi stor required Power-good output Program mable soft start with reverse current p rotection Current-limit protection Ther mal overload protection Overvoltage pro tection Undervoltage lockout 1 µA shut down supply current Small, 24-lead QSOP package APPLICATIONS Telecommunication s and networking systems High performan ce servers Medical imaging systems DSP core power supplies Microprocessor core power supplies Mobile communication ba se stations Distributed power GENERAL D ESCRIPTION The ADP1822 is a versatile a nd inexpensive synchronous voltagemode PWM step-down controller.
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