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ADP2389 Datasheet

12A Step-Down Regulator

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ADP2389 pdf
Data Sheet
18 V, 12 A Step-Down Regulator with
Programmable Current Limit
ADP2389/ADP2390
FEATURES
Input voltage: 4.5 V to 18 V
Continuous output current: 12 A
Integrated MOSFETs: 17 mΩ high-side/4.5 mΩ low-side
0.6 V ± 0.5% reference voltage
Programmable switching frequency range: 200 kHz to 2200 kHz
Enhanced transient response
Programmable current limit with ±10% accuracy
Precision enable and power good
External compensation and soft start
PFM mode (ADP2390 only)
Start up into a precharged output
Supported by the ADIsimPower design tool
APPLICATIONS
Communication infrastructure
Networking and servers
Industrial and instrumentation
Healthcare and medical
Intermediate power rail conversions
DC-to-DC point of load applications
TYPICAL APPLICATIONS CIRCUIT
VIN
CIN
RFTW RILIM RT
CVREG
VIN
PVIN
EN
PGOOD
BST
SW
ADP2389/
ADP2390
FTW
ILIM
RT
VREG
GND
FB
COMP
SS
PGND
CBST
L
VOUT
COUT
RTOP
RBOT
RC
CSS CC
Figure 1.
GENERAL DESCRIPTION
The ADP2389/ADP2390 are current mode control, synchronous
step-down, dc-to-dc regulators. They integrate a 17 mΩ high-side
power MOSFET and a 4.5 mΩ synchronous rectifier MOSFET to
provide a high efficiency solution. The ADP2390 operates in pulse
frequency modulation (PFM) mode to improve the system
efficiency at light load. The ADP2389/ADP2390 run from an
input voltage of 4.5 V to 18 V and can deliver up to 12 A of output
current. The output voltage can be adjusted to 0.6 V and the
switching frequency can be programmed between 200 kHz to
2200 kHz.
The ADP2389/ADP2390 target high performance applications
that require high efficiency and design flexibility. External
compensation and soft start provide design flexibility. The power-
good output and precision enable input provide simple and reliable
power sequencing. An enhanced transient response feature
improves the load transient performance, which reduces the
output capacitance. Programmable current limit allows the user
to optimized the inductor design and provide a compact solution.
Other key features include undervoltage lockout (UVLO),
overvoltage protection (OVP), overcurrent protection (OCP),
and thermal shutdown (TSD).
The ADP2389/ADP2390 operates over a −40°C to +125°C
junction temperature range and is available in 32-lead, 5 mm ×
5 mm LFCSP package.
100
95
90
85
80
75
70
VOUT = 1.2V
65 VOUT = 1.8V
VOUT = 3.3V
60 VOUT = 5.0V
0 1 2 3 4 5 6 7 8 9 10 11 12
OUTPUT CURRENT (A)
Figure 2. ADP2389 Efficiency vs. Output Current, VIN = 12 V, fSW = 300 kHz
Rev. 0
Document Feedback
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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
©2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

ADP2389 Datasheet

12A Step-Down Regulator

No Preview Available !

ADP2389 pdf
ADP2389/ADP2390
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
Typical Applications Circuit............................................................ 1 
General Description ......................................................................... 1 
Revision History ............................................................................... 2 
Detailed Functional Block Diagram .............................................. 3 
Specifications..................................................................................... 4 
Absolute Maximum Ratings............................................................ 6 
Thermal Information ................................................................... 6 
ESD Caution.................................................................................. 6 
Pin Configuration and Function Descriptions............................. 7 
Typical Performance Characteristics ............................................. 8 
Theory of Operation ...................................................................... 12 
Control Scheme .......................................................................... 12 
PFM Mode (ADP2390 Only).................................................... 12 
Precision Enable/Shutdown ...................................................... 12 
Internal Regulator (VREG) ....................................................... 12 
Bootstrap Circuitry .................................................................... 12 
Oscillator ..................................................................................... 12 
Soft Start ...................................................................................... 13 
Fast Transient Response ............................................................ 13 
Power Good................................................................................. 13 
Peak Current-Limit and Short-Circuit Protection................. 13 
Overvoltage Protection (OVP) ................................................. 13 
Data Sheet
Undervoltage Lockout (UVLO) ............................................... 13 
Thermal Shutdown .................................................................... 13 
Applications Information .............................................................. 14 
Input Capacitor Selection.......................................................... 14 
Output Voltage Setting .............................................................. 14 
Inductor Selection ...................................................................... 14 
Output Capacitor Selection....................................................... 15 
Programming Input Voltage UVLO ........................................ 15 
Compensation Design ............................................................... 15 
Design Example .............................................................................. 17 
Output Voltage Setting .............................................................. 17 
Frequency Setting....................................................................... 17 
Inductor Selection ...................................................................... 17 
Output Capacitor Selection....................................................... 17 
Compensation Components..................................................... 18 
Soft Start Time Program ........................................................... 18 
Input Capacitor Selection.......................................................... 18 
Schematic for Design Example................................................. 18 
External Components Recommendation.................................... 19 
Circuit Board Layout Recommendations ................................... 20 
Typical Application Circuits ......................................................... 22 
Outline Dimensions ....................................................................... 23 
Ordering Guide .......................................................................... 23 
REVISION HISTORY
8/15—Revision 0: Initial Version
Rev. 0 | Page 2 of 23


Part Number ADP2389
Description 12A Step-Down Regulator
Maker Analog Devices
Total Page 23 Pages
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