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ADP2443 Datasheet دیتاشیت PDF دانلود

دیتاشیت - Analog Devices - Synchronous Step-Down DC-to-DC Regulator

شماره قطعه ADP2443
شرح مفصل Synchronous Step-Down DC-to-DC Regulator
تولید کننده Analog Devices 
آرم Analog Devices 


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ADP2443 شرح
Data Sheet
3 A, 36 V, Synchronous Step-Down
DC-to-DC Regulator
ADP2443
FEATURES
Continuous output current: 3 A
Input voltage: 4.5 V to 36 V
Integrated MOSFETs: 98 mΩ/35 mΩ
Reference voltage: 0.6 V ± 1%
Fast minimum on time: 50 ns
Programmable switching frequency: 200 kHz to 1.8 MHz
Synchronizes to external clock: 200 kHz to 1.8 MHz
Precision enable and power good
Cycle-by-cycle current limit with hiccup protection
External compensation
Programmable soft start time
Startup into a precharged output
Supported by ADIsimPower design tool
APPLICATIONS
Intermediate power rail conversion
Multicell battery powered systems
Process control and industrial automation
Healthcare and medical
Networking and servers
TYPICAL APPLICATION CIRCUIT
VIN
CIN
RRAMP
RT
CVREG
ADP2443
PVIN
EN
BST
SW
RAMP
PGOOD
RT/SYNC
VREG
FB
COMP
SS
GND PGND
CBST L
RTOP
RC
CSS
RBOT
CC
VOUT
COUT
Figure 1.
GENERAL DESCRIPTION
The ADP2443 is synchronous step-down, dc-to-dc regulator
with an integrated 98 mΩ, high-side power metal oxide semicon-
ductor field effect transistor (MOSFET) and a 35 mΩ, synchronous
rectifier MOSFET to provide a high efficiency solution in a
compact 4 mm × 4 mm LFCSP package. The regulators operate
from an input voltage range of 4.5 V to 36 V. The output voltage
can be adjusted down to 0.6 V and deliver up to 3 A of
continuous current. The fast 50 ns minimum on time allows the
regulators convert high input voltage to low output voltage at high
frequency.
The ADP2443 uses an emulated current mode, constant frequency
pulse-width modulation (PWM) control scheme for excellent
stability and transient response. The switching frequency of the
ADP2443 can be programmed from 200 kHz to 1.8 MHz. The
synchronization function allows the switching frequency be syn-
chronized with an external clock to minimize the system noise.
The ADP2443 targets high performance applications that require
high efficiency and design flexibility. External compensation
and an adjustable soft start function provide design flexibility.
The power-good output and precision enable input provide
simple and reliable power sequencing.
Other key features include undervoltage lockout (UVLO),
overvoltage protection (OVP), overcurrent protection (OCP),
short-circuit protection (SCP), and thermal shutdown (TSD).
The ADP2443 operates over the −40°C to +125°C operating
junction temperature range and is available in a 24-lead, 4 mm ×
4 mm LFCSP package.
100
95
90
85
80
75
70
65
VOUT = 5V
VOUT = 3.3V
60
55
50
0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (A)
Figure 2. Efficiency vs. Output Current, VIN = 24 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.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
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Technical Support
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