36 V,1 A, Synchronous,
Step-Down DC-to-DC Regulator
ADP2441
Data Sheet
FEATURES
TYPICAL CIRCUIT CONFIGURATION
C3
Wide input voltage range of 4.5 V to 36 V
Low minimum on time of 50 ns
Maximum load current of 1 A
C
C4
BST
V
OUT
High efficiency of up to 94%
R
TOP
Adjustable output down to 0.6 V
1% output voltage accuracy
Adjustable switching frequency of 300 kHz to 1 MHz
Pulse skip mode at light load for power saving
Precision enable input pin
V
IN
FB
VIN
R
V
BOTTOM
OUT
COMP ADP2441
SW
C
C
OUT
IN
V
IN
EN
R
PGND
COMP
Open-drain power good
C
COMP
External soft start with tracking
Overcurrent-limit protection
R
FREQ
Shutdown current of less than 15 μA
UVLO and thermal shutdown
Figure 1.
100
90
80
70
60
50
40
30
20
10
0
12-lead, 3 mm × 3 mm LFCSP package
V
= 5V
OUT
V
= 12V
OUT
APPLICATIONS
Point of load applications
Distributed power systems
Industrial control supplies
Standard rail conversion to 24 V/12 V/5 V/3.3 V
V
= 3.3V
OUT
V
= 24V
IN
GENERAL DESCRIPTION
fSW = 300kHz
The ADP2441 is a constant frequency, current mode control,
synchronous, step-down dc-to-dc regulator that is capable of
driving loads up to 1 A with excellent line and load regulation
characteristics. The ADP2441 operates with a wide input voltage
range of 4.5 V to 36 V, which makes it ideal for regulating power
from a wide variety of sources. In addition, the ADP2441 has
very low minimum on time (50 ns) and is, therefore, suitable for
applications requiring a very high step-down ratio.
0.02
0.2
LOAD (A)
1
Figure 2. Efficiency vs. Load Current, VIN = 24 V
The output voltage can be adjusted from 0.6 V to 0.9 V × VIN.
High efficiency is obtained with integrated low resistance
N-channel MOSFETs for both high-side and low-side devices.
The ADP2441 uses hiccup mode to protect the IC from short
circuits or from overcurrent conditions on the output. The external
programmable soft start limits inrush current during startup for
a wide variety of load capacitances. Other key features include
tracking, input undervoltage lockout (UVLO), thermal shutdown
(TSD), and precision enable (EN), which can also be used as a
logic level shutdown input.
The switching frequency is adjustable from 300 kHz to 1 MHz with
an external resistor. The ADP2441 also has an accurate power-good
(PGOOD) open-drain output signal.
At light load conditions, the regulator operates in pulse skip
mode by skipping pulses and reducing switching losses to improve
energy efficiency. In addition, at medium to heavy load conditions,
the regulator operates in fixed frequency pulse-width modulation
(PWM) mode to reduce electromagnetic interference (EMI).
The ADP2441 is available in a 3 mm × 3 mm, 12-lead LFCSP
package and is rated for a junction temperature range of −40°C
to +125°C.
Rev. A
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