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Analog Devices Semiconductor Electronic Components Datasheet

ADP2381 Datasheet

6 A Synchronous Step-Down Regulator

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ADP2381 pdf
Data Sheet
FEATURES
Input voltage: 4.5 V to 20 V
Integrated 44 mΩ high-side MOSFET
0.6 V ± 1% reference voltage over temperature
Continuous output current: 6 A
Programmable switching frequency: 250 kHz to 1.4 MHz
Synchronizes to external clock: 250 kHz to 1.4 MHz
180° out-of-phase synchronization
Programmable UVLO
Power-good output
External compensation
Internal soft start with external adjustable option
Startup into a precharged output
Supported by ADIsimPower design tool
APPLICATIONS
Communication infrastructure
Networking and servers
Industrial and instrumentation
Healthcare and medical
Intermediate power rail conversion
DC-to-dc point of load application
20 V, 6 A Synchronous Step-Down
Regulator with Low-Side Driver
ADP2381
TYPICAL APPLICATIONS CIRCUIT
VIN
CIN
1 PVIN
2
PVIN
BST
SW
16
15
CBST
L
3 14
UVLO ADP2381 SW
4 PGOOD
LD 13
FET
5 RT
ROSC 6 SYNC
VREG 12 CVREG
PGND 11
7
EN/SS
10
GND
CSS
8
COMP
9
FB
CC_EA
RC_EA
VOUT
COUT
RTOP
RBOT
CCP_EA
Figure 1.
100
95
90
85
80
75
70
65
60 VOUT = 3.3V
55
VOUT = 5V
VOUT = 1.2V
50
0123456
OUTPUT CURRENT (A)
Figure 2. ADP2381 Efficiency vs. Output Current, VIN = 12 V, fSW = 250 kHz
GENERAL DESCRIPTION
The ADP2381 is a current mode control, synchronous, step-
down, dc-to-dc regulator. It integrates a 44 mΩ power MOSFET
and a low-side driver to provide a high efficiency solution. The
ADP2381 runs from an input voltage of 4.5 V to 20 V and can
deliver 6 A of output current. The output voltage can be
adjusted to 0.6 V to 90% of the input voltage. The switching
frequency of the ADP2381 can be programmed from
250 kHz to 1.4 MHz or fixed at 290 kHz or 550 kHz. The
synchronization function allows the switching frequency to be
synchronized to an external clock to minimize system noise.
External compensation and an adjustable soft start provide
design flexibility. The power-good output provides simple and
reliable power sequencing. Additional features include
programmable undervoltage lockout (UVLO), overvoltage
protection (OVP), overcurrent protection (OCP), and thermal
shutdown (TSD).
The ADP2381 operates over the −40°C to +125°C junction
temperature range and is available in a 16-lead TSSOP_EP
package.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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
©2012 Analog Devices, Inc. All rights reserved.
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Analog Devices Semiconductor Electronic Components Datasheet

ADP2381 Datasheet

6 A Synchronous Step-Down Regulator

No Preview Available !

ADP2381 pdf
ADP2381
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Typical Applications Circuit............................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Information ................................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Description .............................. 6
Typical Performance Characteristics ............................................. 7
Functional Block Diagram ............................................................ 12
Theory of Operation ...................................................................... 13
Control Scheme .......................................................................... 13
Internal Regulator (VREG) ....................................................... 13
Bootstrap Circuitry .................................................................... 13
Low-Side Driver.......................................................................... 13
Oscillator ..................................................................................... 13
Synchronization.......................................................................... 13
Enable and Soft Start.................................................................. 13
Power Good................................................................................. 14
Peak Current Limit and Short-Circuit Protection ................. 14
Overvoltage Protection (OVP) ................................................. 14
Undervoltage Lockout (UVLO)................................................ 14
Thermal Shutdown..................................................................... 14
REVISION HISTORY
3/12—Revision 0: Initial Version
Data Sheet
Applications Information .............................................................. 15
Input Capacitor Selection.......................................................... 15
Output Voltage Setting .............................................................. 15
Voltage Conversion Limitations............................................... 15
Inductor Selection ...................................................................... 15
Output Capacitor Selection....................................................... 17
Low-Side Power Device Selection............................................ 17
Programming Input Voltage UVLO ........................................ 18
Compensation Design ............................................................... 18
ADIsimPower Design Tool ....................................................... 19
Design Example .............................................................................. 20
Output Voltage Setting .............................................................. 20
Frequency Setting....................................................................... 20
Inductor Selection ...................................................................... 20
Output Capacitor Selection....................................................... 20
Low-Side MOSFET Selection ................................................... 21
Compensation Components..................................................... 21
Soft Start Time Program ........................................................... 21
Input Capacitor Selection.......................................................... 21
Schematic for Design Example................................................. 21
External Components Recommendation.................................... 23
Circuit Board Layout Recommendations ................................... 25
Typical Application Circuits ......................................................... 27
Outline Dimensions ....................................................................... 28
Ordering Guide .......................................................................... 28
Rev. 0 | Page 2 of 28
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Part Number ADP2381
Description 6 A Synchronous Step-Down Regulator
Maker Analog Devices
Total Page 28 Pages
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