Datasheet ADP2387 (Analog Devices)

20 V, 6 A, Synchronous, Step-Down DC-to-DC Regulator Data Sheet ADP2387 FEATURES TYPICAL APPLICATIONS CIRCUIT Input voltage range: 4.5 V to 20 V ADP2387 Integrated MOSFET: 44 mΩ typical/11 mΩ typical BST V PVIN Reference voltage: 0.6 V ± 1% IN CBST L CIN Continuous output current: 6 A EN SW VOUT C Programmable current-limit threshold PGOOD OUT RTOP Programmable switching frequency: 200 kHz to 1400 kHz ILIM FB RILIM Precision enable and power good RT COMP External compensation RT VREG R R SS C BOT Internal soft start with external adjustable option CVREG GND PGND C C SS C Startup into a precharged output
001
Supported by ADIsimPower d esign tool
12643- 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 ADP2387 is a synchronous step-down, dc-to-dc regulator with Other key features include undervoltage lockout (UVLO), an integrated 44 mΩ, high-side power, metal oxide semiconductor overvoltage protection (OVP), overcurrent protection (OCP), field effect transistor (MOSFET) and an 11 mΩ, synchronous short-circuit protection (SCP), and thermal shutdown (TSD). rectifier MOSFET to provide a high efficiency solution in a The ADP2387 operates over the −40°C to +125°C junction compact 4 mm × 4 mm LFCSP. This device uses a peak current temperature range and is available in a 24-lead, 4 mm × 4 mm mode, constant frequency pulse-width modulation (PWM) LFCSP. control scheme for excellent stability and transient response.
100
The switching frequency of the ADP2387 can be programmed between 200 kHz to 1400 kHz.
95 90
The ADP2387 requires minimal external components and operates from an input voltage of 4.5 V to 20 V. The output voltage can
85 %)
be adjusted from 0.6 V to 90% of the input voltage and delivers
( 80
up to 6 A of continuous current. Each IC draws less than 110 µA
NCY 75 E
current from the input source when it is disabled.
ICI F 70 F E
This regulator targets high performance applications that require
65
high efficiency and design flexibility. External compensation
60
and an adjustable soft start function provide design flexibility.
VOUT = 5.0V 55 VOUT = 3.3V
The power-good output and precision enable input provide
VOUT = 1.2V 50
simple and reliable power sequencing. The programmable
0 1 2 3 4 5 6
002 current-limit function allows the inductor to be optimized by
OUTPUT CURRENT (A)
12643- output current. Figure 2. Efficiency vs. Output Current, VIN = 12 V, fSW = 300 kHz
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Document Outline FEATURES APPLICATIONS TYPICAL APPLICATIONS CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL SCHEME PRECISION ENABLE/SHUTDOWN INTERNAL REGULATOR (VREG) BOOTSTRAP CIRCUITRY OSCILLATOR 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 INPUT VOLTAGE UVLO COMPENSATION DESIGN ADIsimPower DESIGN TOOL DESIGN EXAMPLE OUTPUT VOLTAGE SETTING FREQUENCY SETTING CURRENT-LIMIT THRESHOLD SETTING INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION COMPENSATION COMPONENTS SOFT START TIME PROGRAM INPUT CAPACITOR SELECTION RECOMMENDED EXTERNAL COMPONENTS CIRCUIT BOARD LAYOUT RECOMMENDATIONS TYPICAL APPLICATIONS CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE