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PDF ADP2441 Data sheet ( Hoja de datos )
| Número de pieza | ADP2441 | |
| Descripción | Step-Down DC-to-DC Regulator | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
36 V,1 A, Synchronous,
Step-Down DC-to-DC Regulator
ADP2441
FEATURES
Wide input voltage range of 4.5 V to 36 V
Low minimum on time of 50 ns
Maximum load current of 1 A
High efficiency of up to 94%
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
Open-drain power good
External soft start with tracking
Overcurrent-limit protection
Shutdown current of less than 15 µA
UVLO and thermal shutdown
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
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
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.
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 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).
TYPICAL CIRCUIT CONFIGURATION
C3
VOUT
RTOP
RBOTTOM
RCOMP
CCOMP
C4 CBST
FB VIN
ADP2441
COMP
SW
EN PGND
VIN
CIN
VOUT
COUT
RFREQ
Figure 1.
100
VOUT = 12V VOUT = 5V
90
80
70
VOUT = 3.3V
60
50
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40
VIN = 24V
30 fSW = 300kHz
20
10
0
0.02
0.2
LOAD (A)
1
Figure 2. Efficiency vs. Load Current, VIN = 24 V
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. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2012 Analog Devices, Inc. All rights reserved.
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
VIN to PGND
EN to AGND
SW to PGND
BST to PGND
VCC to AGND
BST to SW
FREQ, PGOOD, SS/TRK, COMP, FB to AGND
PGND to AGND
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
Rating
−0.3 V to +40 V
−0.3 V to +40 V
−0.3 V to +40 V
−0.3 V to +45 V
−0.3 V to +6 V
−0.3 V to +6 V
−0.3 V to +6 V
±0.3 V
−40°C to +125°C
−65°C to +150°C
260°C
ADP2441
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages, and is
based on a 4-layer standard JEDEC board.
Table 3. Thermal Resistance
Package Type
θJA θJC Unit
12-Lead LFCSP
40 2.4 °C/W
ESD CAUTION
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Rev. 0 | Page 5 of 32
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
Data Sheet
VOUT
1
INDUCTOR CURRENT
4
SW
2
VIN = 24V
VOUT = 3.3V
FSW = 500kHz
CH1 20.0mV BW CH2 10.0V
M4.00µs A CH4 120mA
CH4 200mA Ω T 41.40%
Figure 28. Pulse Skip Mode,
VIN = 24 V, VOUT = 3.3 V, fSW = 500 kHz, No Load
VOUT
1
INDUCTOR CURRENT
4
VIN = 24V
fVSOWUT=
= 3.3V
500kHz
LOAD = 1A
SW
2
CH1 20.0mV BW CH2 10.0V
M1.00µs A CH2 9.80V
CH4 500mA Ω T 41.40%
Figure 29. PWM Mode,
VIN = 24 V, VOUT = 3.3 V, fSW = 500 kHz, Load = 1 A
VOUT
1
LOAD
SW
4
VIN = 24V
VOUT = 5V
fSW = 700kHz
LOAD STEP = 500mA
2
CH1 100mV BW CH2 10V
M200µs A CH4 690mA
CH4 500mA Ω T 79.80%
Figure 30. Load Transient Response,
VIN = 24 V, VOUT = 5 V, fSW = 700 kHz, Load Step = 500 mA
ADP2441
VOUT
1
INDUCTOR CURRENT
4
VIN = 24V
fVSOWUT=
= 3.3V
500kHz
LOAD = 100mA
SW
2
CH1 20.0mV BW CH2 10.0V M4.00µs A CH4 120mA
CH4 500mA Ω T 41.40%
Figure 31. Pulse Skip Mode,
VIN = 24 V, VOUT = 3.3 V, fSW = 500 kHz, Load = 100 mA
VOUT
1
INDUCTOR CURRENT
4
SW
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2
CH1 200mV
BW CH2 10.0V M2.00ms A CH1
CH4 1.00A Ω T 49.40%
60.0mV
Figure 32. Hiccup Mode,
VIN = 24 V, VOUT = 3.3 V, fSW = 500 kHz, Output Short to PGND
VIN = 24V fSW = 700kHz
VOUT = 5V LOAD STEP = 300mA
VOUT
1
LOAD
SW
4
2
CH1 50.0mV BW CH2 10.0V M200µs A CH4 604mA
CH4 200mA Ω
Figure 33. Load Transient Response,
VIN = 24 V, VOUT = 5 V, fSW = 700 kHz, Load Step = 300 mA
Rev. 0 | Page 11 of 32
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
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