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ADP1822 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADP1822
Description  PWM, Step-Down DC-to-DC Controller with Margining and Tracking
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADP1822 Datasheet(HTML) 1 Page - Analog Devices

 
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PWM, Step-Down DC-to-DC Controller
with Margining and Tracking
ADP1822
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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 Analog Devices, Inc. All rights reserved.
FEATURES
Wide input voltage range: 1 V to 24 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
Telecom 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 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
telecom, medical imaging, high performance servers, and
industrial applications. It operates from a 3.0 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 +85°C temperature
range and is available in a 24-lead QSOP package.
BIAS INPUT
5V
1µF
10Ω
FREQ
SYNC
MAR
MSEL
COMP
SS
100nF
IRF3711
IRF3711
1µH
180µF
20V
1000µF
4V
DH
BST
SW
DL
PGND
TRKP
TRKN
FB
MDN
MUP
0.1µF
VCC
ADP1822
6.18kΩ
POWER INPUT
2.25V TO 24V
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 1. Typical Operating Circuit
97
87
0
16
LOAD CURRENT (A)
96
95
94
93
92
91
90
89
88
2
4
6
8
10
12
14
1.8V OUTPUT
3.3V OUTPUT
Figure 2. Efficiency vs. Load Current, 5 V Input


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