Datasheet ADP2384 (Analog Devices)

20 V, 4 A, Synchronous, Step-Down DC-to-DC Regulator Data Sheet ADP2384 FEATURES TYPICAL APPLICATIONS CIRCUIT Input voltage: 4.5 V to 20 V ADP2384 Integrated MOSFET: 44 mΩ/11.6 mΩ BST V PVIN IN Reference voltage: 0.6 V ± 1% CBST L CIN EN Continuous output current: 4 A SW VOUT COUT Programmable switching frequency: 200 kHz to 1.4 MHz PGOOD RTOP Synchronizes to external clock: 200 kHz to 1.4 MHz SYNC FB 180° out-of-phase clock synchronization RT COMP R Precision enable and power good T VREG R R SS C BOT External compensation CVREG GND PGND C C SS C Internal soft start with external adjustable option
001
Startup into a precharged output
10725-
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 ADP2384 is a synchronous, step-down dc-to-dc regulator Other key features include undervoltage lockout (UVLO), with an integrated 44 mΩ, high-side power MOSFET and overvoltage protection (OVP), overcurrent protection (OCP), an 11.6 mΩ, synchronous rectifier MOSFET to provide a high short-circuit protection (SCP), and thermal shutdown (TSD). efficiency solution in a compact 4 mm × 4 mm LFCSP package. The ADP2384 operates over the −40°C to +125°C junction This device uses a peak current mode, constant frequency pulse- temperature range and is available in a 24-lead, 4 mm × 4 mm width modulation (PWM) control scheme for excel ent stability LFCSP package. and transient response. The switching frequency of the ADP2384
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 ADP2384 requires minimal external components and operates
85 %)
from an input voltage of 4.5 V to 20 V. The output voltage can be
( 80
adjusted from 0.6 V to 90% of the input voltage and delivers up to
NCY 75 E
4 A of continuous current. Each IC draws less than 120 μA current
ICI F 70 F
from the input source when it is disabled.
E 65
This regulator targets high performance applications that require
60 VOUT = 1.2V
high efficiency and design flexibility. External compensation and an
V 55 OUT = 3.3V V
adjustable soft start function provide design flexibility. The power-
OUT = 5V 50
good output and precision enable input provide simple and reliable
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
002 power sequencing.
OUTPUT CURRENT (A)
10725- 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 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