3 A, 36 V, Synchronous Step-Down
DC-to-DC Regulator
ADP2443
Data Sheet
FEATURES
TYPICAL APPLICATION CIRCUIT
Continuous output current: 3 A
ADP2443
Input voltage: 4.5 V to 36 V
Integrated MOSFETs: 98 mΩ/35 mΩ
Reference voltage: 0.6 V 1%
V
PVIN
EN
BST
SW
IN
C
L
BST
V
C
OUT
IN
C
R
R
OUT
RAMP
TOP
RAMP
Fast minimum on time: 50 ns
PGOOD
FB
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
RT/SYNC COMP
R
R
C
R
VREG
SS
T
BOT
C
C
C
VREG
SS
C
GND
PGND
Programmable soft start time
Startup into a precharged output
Supported by ADIsimPower design tool
Figure 1.
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
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.
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
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.
V
V
= 5V
= 3.3V
OUT
OUT
65
60
55
50
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.
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
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Trademarks andregisteredtrademarks are the property of their respective owners.
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Tel: 781.329.4700
Technical Support
©2016 Analog Devices, Inc. All rights reserved.
www.analog.com
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