Datasheet ADP2443 (Analog Devices)

3 A, 36 V, Synchronous Step-Down DC-to-DC Regulator Data Sheet ADP2443 FEATURES TYPICAL APPLICATION CIRCUIT Continuous output current: 3 A ADP2443 Input voltage: 4.5 V to 36 V VIN PVIN BST Integrated MOSFETs: 98 mΩ/35 mΩ CBST L EN SW V Reference voltage: 0.6 V ± 1% C OUT IN R C RAMP R OUT TOP Fast minimum on time: 50 ns RAMP Programmable switching frequency: 200 kHz to 1.8 MHz PGOOD FB RT/SYNC COMP Synchronizes to external clock: 200 kHz to 1.8 MHz RT R VREG SS C RBOT Precision enable and power good CVREG CSS CC Cycle-by-cycle current limit with hiccup protection GND PGND
001
External compensation
14794-
Programmable soft start time
Figure 1.
Startup into a precharged output Supported by ADIsimPower d esign tool APPLICATIONS Intermediate power rail conversion Multicell battery powered systems Process control and industrial automation Healthcare and medical Networking and servers GENERAL DESCRIPTION
The ADP2443 is synchronous step-down, dc-to-dc regulator Other key features include undervoltage lockout (UVLO), with an integrated 98 mΩ, high-side power metal oxide semicon- overvoltage protection (OVP), overcurrent protection (OCP), ductor field effect transistor (MOSFET) and a 35 mΩ, synchronous short-circuit protection (SCP), and thermal shutdown (TSD). rectifier MOSFET to provide a high efficiency solution in a The ADP2443 operates over the −40°C to +125°C operating compact 4 mm × 4 mm LFCSP package. The regulators operate junction temperature range and is available in a 24-lead, 4 mm × from an input voltage range of 4.5 V to 36 V. The output voltage 4 mm LFCSP package. can be adjusted down to 0.6 V and deliver up to 3 A of
100
continuous current. The fast 50 ns minimum on time al ows the regulators convert high input voltage to low output voltage at high
95
frequency.
90
The ADP2443 uses an emulated current mode, constant frequency
85 %)
pulse-width modulation (PWM) control scheme for excel ent
( 80
stability and transient response. The switching frequency of the
NCY 75 E
ADP2443 can be programmed from 200 kHz to 1.8 MHz. The
ICI F 70 F
synchronization function al ows the switching frequency be syn-
E V 65 OUT = 5V V
chronized with an external clock to minimize the system noise.
OUT = 3.3V 60
The ADP2443 targets high performance applications that require
55
high efficiency and design flexibility. External compensation
50
and an adjustable soft start function provide design flexibility.
0 0.5 1.0 1.5 2.0 2.5 3.0
002 The power-good output and precision enable input provide
OUTPUT CURRENT (A)
14794- simple and reliable power sequencing. Figure 2. Efficiency vs. Output Current, VIN = 24 V, fSW = 300 kHz
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Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION 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 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 INPUT VOLTAGE UVLO SLOPE COMPENSATION SETTING COMPENSATION DESIGN ADIsimPOWER DESIGN TOOL DESIGN EXAMPLE OUTPUT VOLTAGE SETTING FREQUENCY SETTING INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION SLOPE COMPENSATION SETTING COMPENSATION COMPONENTS SOFT START TIME PROGRAM INPUT CAPACITOR SELECTION RECOMMENDED EXTERNAL COMPONENTS PRINTED CIRCUIT BOARD LAYOUT RECOMMENDATIONS TYPICAL APPLICATIONS CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE