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ADP2387 の電気的特性と機能
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ADP2387のメーカーはAnalog Devicesです、この部品の機能は「Step-Down DC-to-DC Regulator」です。 |
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製品の詳細 ( Datasheet PDF )
| 部品番号 ADP2387 |
| 部品説明 Step-Down DC-to-DC Regulator |
| メーカ Analog Devices |
ロゴ |
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Data Sheet
20 V, 6 A, Synchronous, Step-Down
DC-to-DC Regulator
ADP2387
FEATURES
Input voltage range: 4.5 V to 20 V
Integrated MOSFET: 44 mΩ typical/11 mΩ typical
Reference voltage: 0.6 V ± 1%
Continuous output current: 6 A
Programmable current-limit threshold
Programmable switching frequency: 200 kHz to 1400 kHz
Precision enable and power good
External compensation
Internal soft start with external adjustable option
Startup into a precharged output
Supported by ADIsimPower design tool
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 ADP2387 is a synchronous step-down, dc-to-dc regulator with
an integrated 44 mΩ, high-side power, metal oxide semiconductor
field effect transistor (MOSFET) and an 11 mΩ, synchronous
rectifier MOSFET to provide a high efficiency solution in a
compact 4 mm × 4 mm LFCSP. 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 ADP2387 can be programmed
between 200 kHz to 1400 kHz.
The ADP2387 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 6 A of continuous current. Each IC draws less than 110 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. The programmable
current-limit function allows the inductor to be optimized by
output current.
TYPICAL APPLICATIONS CIRCUIT
VIN
CIN
RILIM
RT
CVREG
ADP2387
PVIN
BST
EN
PGOOD
SW
ILIM
RT
FB
COMP
VREG
SS
GND PGND
CBST L
RTOP
RC
CSS
RBOT
CC
VOUT
COUT
Figure 1.
Other key features include undervoltage lockout (UVLO),
overvoltage protection (OVP), overcurrent protection (OCP),
short-circuit protection (SCP), and thermal shutdown (TSD).
The ADP2387 operates over the −40°C to +125°C junction
temperature range and is available in a 24-lead, 4 mm × 4 mm
LFCSP.
100
95
90
85
80
75
70
65
60
55
50
0
VOUT = 5.0V
VOUT = 3.3V
VOUT = 1.2V
12345
OUTPUT CURRENT (A)
6
Figure 2. Efficiency vs. Output Current, VIN = 12 V, fSW = 300 kHz
Rev. B
Document Feedback
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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 ©2014–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 Page
ADP2387
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Typical Applications Circuit............................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Functional Block Diagram .............................................................. 3
Specifications..................................................................................... 4
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Theory of Operation ...................................................................... 12
Control Scheme .......................................................................... 12
Precision Enable/Shutdown ...................................................... 12
Internal Regulator (VREG) ....................................................... 12
Bootstrap Circuitry .................................................................... 12
Oscillator ..................................................................................... 12
Soft Start ...................................................................................... 12
Power Good................................................................................. 13
Peak Current-Limit and Short-Circuit Protection................. 13
Overvoltage Protection (OVP) ................................................. 13
Undervoltage Lockout (UVLO) ............................................... 14
Thermal Shutdown..................................................................... 14
REVISION HISTORY
1/16—Revision B: Initial Version
Data Sheet
Applications Information .............................................................. 15
Input Capacitor Selection.......................................................... 15
Output Voltage Setting .............................................................. 15
Voltage Conversion Limitations............................................... 15
Inductor Selection ...................................................................... 16
Output Capacitor Selection....................................................... 16
Programming Input Voltage UVLO ........................................ 17
Compensation Design ............................................................... 17
ADIsimPower Design Tool ....................................................... 18
Design Example .............................................................................. 19
Output Voltage Setting .............................................................. 19
Frequency Setting....................................................................... 19
Current-Limit Threshold Setting ............................................. 19
Inductor Selection ...................................................................... 19
Output Capacitor Selection....................................................... 20
Compensation Components..................................................... 20
Soft Start Time Program ........................................................... 20
Input Capacitor Selection.......................................................... 20
Recommended External Components .................................... 21
Circuit Board Layout Recommendations ................................... 22
Typical Applications Circuits........................................................ 24
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 25
Rev. B | Page 2 of 25
3Pages
Data Sheet
Parameter
EN
EN Rising Threshold
EN Falling Threshold
EN Source Current
THERMAL SHUTDOWN (TSD)
Threshold
Hysteresis
1 Pin-to-pin measurement.
2 Guaranteed by design.
ADP2387
Symbol Test Conditions/Comments
Min Typ Max Unit
1.17 1.25 V
0.97 1.07
V
EN voltage below falling threshold
5
µA
EN voltage above rising threshold
1
µA
150 °C
25 °C
Rev. B | Page 5 of 25
6 Page
合計 : 26 ページ |
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