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PDF ADP1822 Data sheet ( Hoja de datos )
| Número de pieza | ADP1822 | |
| Descripción | Step-Down DC-to-DC Controller | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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PWM, Step-Down DC-to-DC Controller
with Margining and Tracking
ADP1822
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
15pF
80.6kΩ
309pF
CMOSH-3
10Ω
1µF
VCC VCC 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
180µF
20V
POWER INPUT
2.25V TO 24V
IRF3711
1µH
IRF3711
20kΩ
OUTPUT
1000µF 1.8V, 15A
4V
10kΩ
TRACKING
SIGNAL INPUT
Figure 1. Typical Operating Circuit
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 2. Efficiency vs. Load Current, 5 V Input
16
Rev. B
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.
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.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
VCC, SHDN, SYNC, FREQ, COMP, SS, FB,
TRKP, TRKN, MAR, MSEL, MUP, and
MDN to GND; PVCC to PGND; BST to SW
BST to GND
CSL to GND
DH to GND
DL to PGND
SW to GND
PGND to GND
θJA, 2-Layer (SEMI Standard Board)
θJA, 4-Layer (JEDEC Standard Board)
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Maximum Soldering Lead Temperature
Rating
−0.3 V to +6 V
−0.3 V to +30 V
−1 V to +30 V
(VSW − 0.3 V) to
(VBST + 0.3 V)
−0.3 V to
(VPVCC + 0.3 V)
−2 V to +30 V
±2 V
122°C/W
82°C/W
−40°C to +85°C
−55°C to +125°C
−65°C to +150°C
260°C
ADP1822
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Absolute maximum ratings apply individually only, not in
combination. Unless otherwise specified, all other voltages are
referenced to GND.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. B | Page 5 of 24
5 Page 
TRACKING VOLTAGE (1V/DIV)
OUTPUT VOLTAGE (1V/DIV)
Figure 17. Output Voltage Tracking Response
ADP1822
Rev. B | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADP1822.PDF ] | |
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