Data Sheet
FEATURES
Input voltage: 4.5 V to 20 V
Integrated MOSFET: 44 mΩ/11.6 mΩ
Reference voltage: 0.6 V ± 1%
Continuous output current: 4 A
Programmable switching frequency: 200 kHz to 1.4 MHz
Synchronizes to external clock: 200 kHz to 1.4 MHz
180° out-of-phase clock synchronization
Precision enable and power good
External compensation
Internal soft start with external adjustable option
Startup into a precharged output
Supported by ADIsimPower design tool
20 V, 4 A, Synchronous, Step-Down
DC-to-DC Regulator
ADP2384
TYPICAL APPLICATIONS CIRCUIT
ADP2384
V
IN
C
IN
PVIN
EN
PGOOD
SYNC
RT
R
T
C
VREG
VREG
GND
PGND
FB
COMP
SS
R
C
BST
C
BST
SW
R
TOP
L
V
OUT
C
OUT
R
BOT
10725-001
C
SS
C
C
Figure 1.
APPLICATIONS
Communications infrastructure
Networking and servers
Industrial and instrumentation
Healthcare and medical
Intermediate power rail conversion
DC-to-dc point-of-load applications
GENERAL DESCRIPTION
The
ADP2384
is a synchronous, step-down dc-to-dc regulator
with an integrated 44 mΩ, high-side power MOSFET and
an 11.6 mΩ, synchronous rectifier MOSFET to provide a high
efficiency solution in a compact 4 mm × 4 mm LFCSP package.
This device uses a peak current mode, constant frequency pulse-
width modulation (PWM) control scheme for excellent stability
and transient response. The switching frequency of the
ADP2384
can be programmed from 200 kHz to 1.4 MHz. To minimize
system noise, the synchronization function allows the switching
frequency to be synchronized to an external clock.
The
ADP2384
requires minimal external components and operates
from an input voltage of 4.5 V to 20 V. The output voltage can be
adjusted from 0.6 V to 90% of the input voltage and delivers up to
4 A of continuous current. Each IC draws less than 120 μA current
from the input source when it is disabled.
This regulator targets high performance applications that require
high efficiency and design flexibility. External compensation and an
adjustable soft start function provide design flexibility. The power-
good output and precision enable input provide simple and reliable
power sequencing.
Other key features include undervoltage lockout (UVLO),
overvoltage protection (OVP), overcurrent protection (OCP),
short-circuit protection (SCP), and thermal shutdown (TSD).
The
ADP2384
operates over the −40°C to +125°C junction
temperature range and is available in a 24-lead, 4 mm × 4 mm
LFCSP package.
100
95
90
85
EFFICIENCY (%)
80
75
70
65
60
55
50
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
OUTPUT CURRENT (A)
V
OUT
= 1.2V
V
OUT
= 3.3V
V
OUT
= 5V
10725-002
Figure 2. Efficiency vs. Output Current, V
IN
= 12 V, f
SW
= 300 kHz
Rev. A
Document Feedback
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2012–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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.
Trademarks and registered trademarks are the property of their respective owners.
ADP2384* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
View a parametric search of comparable parts.
REFERENCE MATERIALS
Press
•
Analog Devices Introduces the Most Efficient Switching
Regulators in Their Class
Technical Articles
•
MS-2437: Convert a Buck Regulator into a Smart LED
Driver
•
Powering GSPS or RF Sampling ADCs: Switcher vs LDO
EVALUATION KITS
•
ADA4961 & AD9680 Analog Signal Chain Evaluation and
AD9528 Converter Synchronization
•
ADP2384/ADP2386 Evaluation Board
•
Two Channels, 2400MHz TDD Application
DOCUMENTATION
Application Notes
•
AN-1168: Designing an Inverting Power Supply Using the
ADP2384/ADP2386 Synchronous Step-Down DC-to-DC
Regulators
Data Sheet
•
ADP2384: 20 V, 4 A, Synchronous, Step-Down DC-to-DC
Regulator Data Sheet
User Guides
•
UG-466: Evaluation Board for the ADP2384/ADP2386, 20
V, 4 A/6 A Synchronous Step-Down DC-to-DC Regulators
DESIGN RESOURCES
•
ADP2384 Material Declaration
•
PCN-PDN Information
•
Quality And Reliability
•
Symbols and Footprints
DISCUSSIONS
View all ADP2384 EngineerZone Discussions.
SAMPLE AND BUY
Visit the product page to see pricing options.
TOOLS AND SIMULATIONS
• ADIsimPower™ Voltage Regulator Design Tool
•
ADP238x Buck Regulator Design Tool
•
ADP238x Inverting Buck-Boost Regulator Design Tool
TECHNICAL SUPPORT
Submit a technical question or find your regional support
number.
DOCUMENT FEEDBACK
Submit feedback for this data sheet.
This page is dynamically generated by Analog Devices, Inc., and inserted into this data sheet. A dynamic change to the content on this page will not
trigger a change to either the revision number or the content of the product data sheet. This dynamic page may be frequently modified.
ADP2384
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Typical Applications Circuit............................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Functional Block Diagram ............................................................ 11
Theory of Operation ...................................................................... 12
Control Scheme .......................................................................... 12
Precision Enable/Shutdown ...................................................... 12
Internal Regulator (VREG) ....................................................... 12
Bootstrap Circuitry .................................................................... 12
Oscillator ..................................................................................... 12
Synchronization .......................................................................... 12
Soft Start ...................................................................................... 13
Power Good ................................................................................. 13
Peak Current-Limit and Short-Circuit Protection................. 13
Overvoltage Protection (OVP) ................................................. 14
Undervoltage Lockout (UVLO) ............................................... 14
Data Sheet
Thermal Shutdown .................................................................... 14
Applications Information .............................................................. 15
Input Capacitor Selection .......................................................... 15
Output Voltage Setting .............................................................. 15
Voltage Conversion Limitations ............................................... 15
Inductor Selection ...................................................................... 15
Output Capacitor Selection....................................................... 16
Programming the Input Voltage UVLO.................................. 17
Compensation Design ............................................................... 17
ADIsimPower Design Tool ....................................................... 18
Design Example .............................................................................. 19
Output Voltage Setting (Design Example) .............................. 19
Frequency Setting ....................................................................... 19
Inductor Selection (Design Example) ..................................... 19
Output Capacitor Selection (Design Example) ...................... 20
Compensation Components ..................................................... 20
Soft Start Time Program ........................................................... 20
Input Capacitor Selection (Design Example) ......................... 20
Recommended External Components .................................... 21
Circuit Board Layout Recommendations ................................... 22
Typical Applications Circuits ........................................................ 23
Outline Dimensions ....................................................................... 24
Ordering Guide .......................................................................... 24
REVISION HISTORY
7/14—Rev. 0 to Rev. A
Changes to Table 2 and Table 3 ....................................................... 5
Changes to Inductor Selection Section ........................................ 15
Changes to Compensation Components Section....................... 20
Updated Outline Dimensions ....................................................... 24
8/12—Revision 0: Initial Version
Rev. A | Page 2 of 24
Data Sheet
SPECIFICATIONS
ADP2384
V
PVIN
= 12 V, T
J
= −40°C to +125°C for minimum/maximum specifications, and T
A
= 25°C for typical specifications, unless otherwise noted.
Table 1.
Parameter
PVIN
PVIN Voltage Range
Quiescent Current
Shutdown Current
PVIN Undervoltage Lockout Threshold
FB
FB Regulation Voltage
FB Bias Current
ERROR AMPLIFIER (EA)
Transconductance
EA Source Current
EA Sink Current
INTERNAL REGULATOR (VREG)
VREG Voltage
Dropout Voltage
Regulator Current Limit
SW
High-Side On Resistance
1
Low-Side On Resistance
1
High-Side Peak Current Limit
Low-Side Negative Current-Limit
Threshold Voltage
2
SW Minimum On Time
SW Minimum Off Time
BST
Bootstrap Voltage
OSCILLATOR (RT PIN)
Switching Frequency
Switching Frequency Range
SYNC
Synchronization Range
SYNC Minimum Pulse Width
SYNC Minimum Off Time
SYNC Input High Voltage
SYNC Input Low Voltage
SS
Internal Soft Start
SS Pin Pull-Up Current
V
FB
I
FB
g
m
I
SOURCE
I
SINK
V
VREG
V
PVIN
= 12 V, I
VREG
= 50 mA
V
PVIN
= 12 V, I
VREG
= 50 mA
340
40
40
7.6
65
V
BST
− V
SW
= 5 V
V
VREG
= 8 V
4.8
0°C < T
J
< 85°C
−40°C < T
J
< 125°C
0.594
0.591
0.6
0.6
0.01
470
60
60
8
340
100
44
11.6
6.1
20
125
200
4.5
R
T
= 100 kΩ
530
200
200
100
100
1.3
5
600
0.606
0.609
0.1
600
80
80
8.4
135
70
20
7.4
V
V
µA
µS
µA
µA
V
mV
mA
mΩ
mΩ
A
mV
ns
ns
V
kHz
kHz
kHz
ns
ns
V
V
Clock cycles
µA
Symbol
V
PVIN
I
Q
I
SHDN
UVLO
Test Conditions/Comments
Min
4.5
2.1
45
3.5
Typ
Max
20
3.6
120
4.5
Unit
V
mA
µA
V
V
No switching
EN = GND
PVIN rising
PVIN falling
2.9
80
4.3
3.8
t
MIN_ON
t
MIN_OFF
V
BOOT
f
SW
f
SW
168
260
5.5
670
1400
1400
0.4
1600
3.2
I
SS_UP
2.5
3.9
Rev. A | Page 3 of 24
ADP2384
Parameter
PGOOD
Power-Good Range
FB Rising Threshold
FB Rising Hysteresis
FB Falling Threshold
FB Falling Hysteresis
Power-Good Deglitch Time
Power-Good Leakage Current
Power-Good Output Low Voltage
EN
EN Rising Threshold
EN Falling Threshold
EN Source Current
THERMAL SHUTDOWN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
1
2
Data Sheet
Symbol
Test Conditions/Comments
Min
Typ
Max
Unit
PGOOD from low to high
PGOOD from high to low
PGOOD from low to high
PGOOD from high to low
PGOOD from low to high
PGOOD from high to low
V
PGOOD
= 5 V
I
PGOOD
= 1 mA
95
5
105
11.7
1024
16
0.01
125
1.17
1.07
5
1
150
25
0.1
200
1.28
%
%
%
%
Clock cycle
Clock cycle
µA
mV
V
V
µA
µA
°C
°C
0.97
EN voltage below falling threshold
EN voltage above rising threshold
Pin-to-pin measurement.
Guaranteed by design.
Rev. A | Page 4 of 24
京公网安备 11010802033920号
EEWORLD
