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| 型号： | ADP2441-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADP2411 |
| 标准包装： | 1 |
| 系列： | * |
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36 V,1 A, Synchronous,
Step-Down DC-to-DC Regulator
Data Sheet
FEATURES
Wide input voltage range of 4.5 V to 36 V
TYPICAL CIRCUIT CONFIGURATION
C3
Low minimum on time of 50 ns
Maximum load current of 1 A
High efficiency of up to 94%
V OUT
C4
C BST
Adjustable output down to 0.6 V
±1% output voltage accuracy
Adjustable switching frequency of 300 kHz to 1 MHz
R TOP
R BOTTOM
FB
COMP
ADP2441
VIN
SW
V IN
V OUT
Pulse skip mode at light load for power saving
Precision enable input pin
R COMP
V IN
EN
PGND
C IN
C OUT
Open-drain power good
External soft start with tracking
Overcurrent-limit protection
Shutdown current of less than 15 μA
UVLO and thermal shutdown
C COMP
R FREQ
Figure 1.
12-lead, 3 mm × 3 mm LFCSP package
APPLICATIONS
Point of load applications
Distributed power systems
Industrial control supplies
Standard rail conversion to 24 V/12 V/5 V/3.3 V
100
90
80
70
60
50
V OUT = 12V
V OUT = 5V
V OUT = 3.3V
40
GENERAL DESCRIPTION
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
30
20
10
0
V IN = 24V
f SW = 300kHz
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
0.02
0.2
LOAD (A)
Figure 2. Efficiency vs. Load Current, V IN = 24 V
1
very low minimum on time (50 ns) and is, therefore, suitable for
applications requiring a very high step-down ratio.
The output voltage can be adjusted from 0.6 V to 0.9 V × V IN .
High efficiency is obtained with integrated low resistance
N-channel MOSFETs for both high-side and low-side devices.
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 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 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
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ?2012 Analog Devices, Inc. All rights reserved.
Trademarks and registered trademarks are the property of their respective owners.
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