Datasheet ADP2386 (Analog Devices)

20 V, 6 A, Synchronous Step-Down DC-to-DC Regulator Data Sheet ADP2386 FEATURES TYPICAL APPLICATIONS CIRCUIT Input voltage: 4.5 V to 20 V ADP2386 Integrated MOSFET: 44 mΩ/11 mΩ BST V PVIN Reference voltage: 0.6 V ± 1% IN CBST L CIN Continuous output current: 6 A EN SW VOUT C Programmable switching frequency: 200 kHz to 1.4 MHz PGOOD OUT RTOP Synchronizes to external clock: 200 kHz to 1.4 MHz SYNC FB 180° out of phase clock synchronization RT COMP Precision enable and power good RT VREG R R SS C BOT External compensation CVREG GND PGND C C SS C Internal soft start with external adjustable option
001 1- 1
Startup into a precharged output
102
Supported by ADIsimPower design tool
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 ADP2386 is a synchronous step-down, dc-to-dc regulator with Other key features include undervoltage lockout (UVLO), an integrated 44 mΩ, high-side power MOSFET and an 11 mΩ, overvoltage protection (OVP), overcurrent protection (OCP), synchronous rectifier MOSFET to provide a high efficiency short-circuit protection (SCP), and thermal shutdown (TSD). solution in a compact 4 mm × 4 mm LFCSP package. This device The ADP2386 operates over the −40°C to +125°C junction uses a peak current mode, constant frequency pulse-width temperature range and is available in a 24-lead, 4 mm × 4 mm modulation (PWM) control scheme for excel ent stability and LFCSP package. transient response. The switching frequency of the ADP2386
100
can be programmed from 200 kHz to 1.4 MHz. To minimize system noise, the synchronization function allows the switching
95
frequency to be synchronized to an external clock.
90
The ADP2386 requires minimal external components and
85 %)
operates from an input voltage of 4.5 V to 20 V. The output
( 80 Y C
voltage can be adjusted from 0.6 V to 90% of the input voltage
N 75 IE
and delivers up to 6 A of continuous current. Each IC draws less
70 FFIC
than 110 μA current from the input source when it is disabled.
E 65
This regulator targets high performance applications that require
60
high efficiency and design flexibility. External compensation and an
VOUT = 5.0V 55 VOUT = 3.3V
adjustable soft start function provide design flexibility. The power-
VOUT = 1.2V 50
good output and precision enable input provide simple and reliable
0 1 2 3 4 5 6
002 1- 1 power sequencing.
OUTPUT CURRENT (A)
102 Figure 2. Efficiency vs. Output Current, VIN = 12 V, fSW = 300 kHz
Rev. C Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2012–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Features Applications Typical Applications Circuit General Description Table of Contents Revision History Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Functional Block Diagram Theory of Operation Control Scheme Precision Enable/Shutdown Internal Regulator (VREG) Bootstrap Circuitry Oscillator Synchronization Soft Start Power Good Peak Current-Limit and Short-Circuit Protection Overvoltage Protection (OVP) Undervoltage Lockout (UVLO) Thermal Shutdown Applications Information Input Capacitor Selection Output Voltage Setting Voltage Conversion Limitations Inductor Selection Output Capacitor Selection Programming the Input Voltage UVLO Compensation Design ADIsimPower Design Tool Design Example Output Voltage Setting (Design Example) Frequency Setting Inductor Selection (Design Example) Output Capacitor Selection (Design Example) Compensation Components Soft Start Time Program Input Capacitor Selection (Design Example) Recommended External Components Circuit Board Layout Recommendations Typical Applications Circuits Outline Dimensions Ordering Guide