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ADP2442 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 ADP2442은 전자 산업 및 응용 분야에서
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부품번호 ADP2442 기능
기능 DC-to-DC Regulator
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ADP2442 데이터시트, 핀배열, 회로
36 V,1 A, Synchronous, Step-Down, DC-to-DC
Regulator with External Clock Synchronization
Data Sheet
ADP2442
FEATURES
Wide input voltage range from 4.5 V to 36 V
Low minimum on time of 50 ns typical
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 from 300 kHz to 1 MHz
External synchronization from 300 kHz to 1 MHz
Pulse skip mode or forced fixed frequency mode
Precision enable input pin (EN)
Open-drain power good
Internal soft start
Overcurrent-limit protection
Shutdown current of less than 15 µA
UVLO and thermal shutdown
12-lead, 3 mm × 3 mm LFCSP package
Supported by the ADIsimPower™ tool set
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 ADP2442 is a constant frequency, current mode control,
synchronous, step-down, dc-to-dc regulator that is capable of
driving loads of up to 1 A with excellent line and load regulation
characteristics. The ADP2442 operates with a wide input voltage
range from 4.5 V to 36 V, which makes it ideal for regulating power
from a wide variety of sources. In addition, the ADP2442 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 × 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 ADP2442 also has an accurate power-good
(PGOOD) open-drain output signal.
The ADP2442 offers the flexibility of external clock synchroni-
zation. The switching frequency can be synchronized to an external
clock, applied to the SYNC/MODE pin. The ADP2442 can also
be configured to operate in the forced fixed frequency mode for
low EMI or power saving mode to reduce the switching losses at
light load.
Rev. 0
Document Feedback
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.
TYPICAL CIRCUIT CONFIGURATION
C2
VOUT
RTOP
RBOTTOM
RCOMP
CCOMP
C1
CBOOST
FB VIN
ADP2442
COMP
SW
PGND
EN
VIN
CIN
VOUT
COUT
RFREQ
Figure 1.
The ADP2442 uses hiccup mode to protect the IC from short
www.DataSheet.net/ circuits or from overcurrent conditions on the output. The internal
soft start limits inrush current during startup for a wide variety of
load capacitances. Other key features include input undervoltage
lockout (UVLO), thermal shutdown (TSD), and precision enable
(EN), which can also be used as a logic level shutdown input.
The ADP2442 is available in a 3 mm × 3 mm, 12-lead LFCSP
package and is rated for a junction temperature range from
−40°C to +125°C.
100
90 VOUT = 12V
80
70
VOUT = 5V
60
50
VOUT = 3.3V
40
30
20
10
VIN = 24V
PWM = 300kHz
0
0.01
0.1
LOAD (A)
1
Figure 2. Efficiency vs. Load Current, VIN = 24 V
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.
Technical Support
www.analog.com
Datasheet pdf - http://www.DataSheet4U.co.kr/




ADP2442 pdf, 반도체, 판매, 대치품
ADP2442
Data Sheet
Parameter
POWER GOOD
PGOOD High, FB Rising Threshold5
PGOOD Low, FB Rising Threshold5
PGOOD High, FB Falling Threshold5
PGOOD Low, FB Falling Threshold5
PGOOD
Delay
High Leakage Current
Pull-Down Resistor
SYNC/MODE
SYNC/MODE Input
Logic High
Logic Low
Pulse Width
Symbol Test Conditions/Comments Min Typ Max Unit
89 92 95 %
111 115 118 %
106 109 112 %
83 86 89 %
tPGOOD
IPGOOD(SRC)
IPGOOD(SNK)
VPGOOD = VCC
FB = 0 V
50 µs
1 10 µA
0.5 0.7 kΩ
2V
0.8 V
100 ns
1 Guaranteed by design.
2 Measured between VIN and SW pins and includes bond wires and pin resistance.
3 Based on bench characterization. Measured with VIN = 12 V, VOUT = 1.2 V, load = 1 A, fSW = 1 MHz, and the output in regulation. Measurement does not include dead time.
4 Based on bench characterization. Measured with VIN = 15 V, VOUT = 12 V, load = 1 A, fSW = 600 kHz, and the output in regulation. Measurement does not include dead time.
5 This threshold is expressed as a percentage of the nominal output voltage.
www.DataSheet.net/
Rev. 0 | Page 4 of 36
Datasheet pdf - http://www.DataSheet4U.co.kr/

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ADP2442 전자부품, 판매, 대치품
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
EFFICIENCY IN FORCED FIXED FREQUENCY MODE
100
90
80
VIN = 12V
70
VIN = 24V
60
50
40
30
20
VOUT = 3.3V
10 fSW = 300kHz
0
0.01
0.1
1
LOAD (A)
Figure 4. Efficiency vs. Load Current, VOUT = 3.3 V, fSW = 300 kHz
100
90 VIN = 12V
80
70
60
VIN = 24V
VIN = 36V
50
40
30
20
VOUT = 5V
10 fSW = 300kHz
0
0.01
0.1
1
LOAD (A)
Figure 5. Efficiency vs. Load Current, VOUT = 5 V, fSW = 300 kHz
www.DataSheet.net/
100
90 VIN = 24V
80
70
VIN = 36V
60
50
40
30
20
10
VOUT = 12V
fSW = 300kHz
0
0.01
0.1
1
LOAD (A)
Figure 6. Efficiency vs. Load Current, VOUT = 12 V, fSW = 300 kHz
ADP2442
100
90
80
70 VIN = 12V
60
VIN = 24V
50
40
30
20
VOUT = 3.3V
10 fSW = 700kHz
0
0.01
0.1
1
LOAD (A)
Figure 7. Efficiency vs. Load Current, VOUT = 3.3 V, fSW = 700 kHz
100
90
VIN = 12V
80
70
60 VIN = 24V
50 VIN = 36V
40
30
20
VOUT = 5V
10 fSW = 700kHz
0
0.01
0.1
1
LOAD (A)
Figure 8. Efficiency vs. Load Current, VOUT = 5 V, fSW = 700 kHz
100
VIN = 24V
90
80
70 VIN = 36V
60
50
40
30
20
10
VOUT = 12V
fSW = 600kHz
0
0.01
0.1
1
LOAD (A)
Figure 9. Efficiency vs. Load Current, VOUT = 12 V, fSW = 600 kHz
Rev. 0 | Page 7 of 36
Datasheet pdf - http://www.DataSheet4U.co.kr/

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