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ADP2504 데이터시트 PDF




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ADP2504 데이터시트, 핀배열, 회로
Data Sheet
600 mA/1000 mA, 2.5 MHz Buck-Boost
DC-to-DC Converters
ADP2503/ADP2504
FEATURES
GENERAL DESCRIPTION
1 mm height profile
Compact PCB footprint
Seamless transition between modes
38 μA typical quiescent current
2.5 MHz operation enables 1.5 μH inductor
Input voltage: 2.3 V to 5.5 V
Fixed output voltage: 2.8 V to 5.0 V
Adjustable model output voltage range: 2.8 V to 5.5 V
600 mA (ADP2503) and 1000 mA (ADP2504) output options
Boost converter configuration with load disconnect
SYNC pin with three different modes
Power save mode (PSM) for improved light load efficiency
Forced fixed frequency operation mode
Synchronization with external clock
Internal compensation
Soft start
Enable/shutdown logic input
Overtemperature protection
Short-circuit protection
Undervoltage lockout protection
Small 10-lead 3 mm × 3 mm LFCSP (QFN) package
Supported by ADIsimPower™ design tool
APPLICATIONS
Wireless handsets
Digital cameras/portable audio players
Miniature hard disk power supplies
USB powered devices
The ADP2503/ADP2504 are high efficiency, low quiescent current
step-up/step-down dc-to-dc converters that can operate at input
voltages greater than, less than, or equal to the regulated output
voltage. The power switches and synchronous rectifiers are
internal to minimize external device count. At high load currents,
the ADP2503/ADP2504 use a current-mode, fixed frequency
pulse-width modulation (PWM) control scheme for optimal
stability and transient response. To ensure the longest battery life
in portable applications, the ADP2503/ADP2504 have an optional
power save mode that reduces the switching frequency under
light load conditions. For wireless and other low noise applica-
tions where variable frequency power save mode may cause
interference, the logic control input sync forces fixed frequency
PWM operation under all load conditions.
The ADP2503/ADP2504 can run from input voltages between
2.3 V and 5.5 V, allowing single lithium or lithium polymer cell,
multiple alkaline or NiMH cells, PCMCIA, USB, and other stan-
dard power sources. The ADP2503/ADP2504 have fixed output
options, or using the adjustable model, the output voltage can
be programmed through an external resistor divider. Compensa-
tion is internal to minimize the number of external components.
During logic-controlled shutdown, the input is disconnected
from the output and draws less than 1 μA from the input source.
Operating as boost converters, the ADP2503/ADP2504 feature a
true load disconnect function that isolates the load from the
power source. Other key features include undervoltage lockout
to prevent deep battery discharge, and soft start to prevent input
current overshoot at startup.
TYPICAL APPLICATION CIRCUIT
1.5µH
VIN
2.3V TO 5.5V
10µF
SW1
SW2
ADP2503/ADP2504
PVIN
VOUT
VIN FB
VOUT
2.8V TO 5V
22µF
SYNC1
EN AGND PGND
ON
OFF
1ALLOWS THE ADP2503/ADP2504 TO OPERATE IN
THREE DIFFERENT MODES.
Figure 1.
Rev. D
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2008–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com




ADP2504 pdf, 반도체, 판매, 대치품
ADP2503/ADP2504
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
PVIN, VIN, SW1, SW2, VOUT, SYNC, EN, FB
PGND to AGND
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Soldering Conditions
ESD Human Body Model
ESD Charged Device Model
ESD Machine Model
Rating
−0.3 V to +6 V
−0.3 V to 0.3 V
−40°C to +125°C
−40°C to +125°C
−65°C to +150°C
JEDEC J-STD-020
±2000 V
±1500 V
±100 V
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
THERMAL DATA
Absolute maximum ratings apply individually only, not in
combination.
The ADP2503/ADP2504 can be damaged when the junction
temperature limits are exceeded. Monitoring ambient tempera-
ture (TA) does not guarantee that the junction temperature (TJ)
is within the specified temperature limits. In applications with
high power dissipation and poor thermal resistance, the maximum
ambient temperature may have to be derated. In applications
with moderate power dissipation and low PCB thermal resis-
tance, the maximum ambient temperature can exceed the
maximum limit as long as the junction temperature is within
specification limits. TJ of the device is dependent on TA, the
power dissipation (PD) of the device, and the junction-to-
ambient thermal resistance (θJA) of the package. Maximum
TJ is calculated from TA and PD using the following formula:
TJ = TA + (PD × θJA)
Data Sheet
θJA of the package is based on modeling and calculation using a
4-layer board. The junction-to-ambient thermal resistance is
highly dependent on the application and board layout. In applica-
tions where high maximum power dissipation exists, close
attention to thermal board design is required. The value of θJA
may vary, depending on PCB material, layout, and environmental
conditions. The specified values of θJA are based on a 4-layer,
4 inch × 3 inch circuit board. Refer to JEDEC JESD 51-9 for
detailed information on the board construction.
THERMAL RESISTANCE
θJA are specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3.
Package Type
10-Lead LFCSP (QFN)
JA Unit
84 °C/W
ESD CAUTION
Rev. D | Page 4 of 16

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ADP2504 전자부품, 판매, 대치품
Data Sheet
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
IOUT (A)
VIN = 5.5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.3V
0.1
1
Figure 9. Efficiency vs. Output Current, PWM Mode (VOUT = 2.8 V)
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
IOUT (A)
VIN = 5.5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.3V
0.1
1
Figure 10. Efficiency vs. Output Current, PSM and PWM Mode (VOUT = 2.8 V)
100
90
80
70
60
50
40
30
IOUT = 500mA
20 IOUT = 100mA
IOUT = 10mA
10
0
2.3 2.8 3.3 3.8 4.3 4.8 5.3
VIN (V)
Figure 11. Efficiency vs. Input Voltage (VOUT = 3.3 V)
ADP2503/ADP2504
3.35
3.33
3.31
3.29
3.27
3.25
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
IOUT (A)
Figure 12. Load Regulation (VIN = 3.6 V, VOUT = 3.3 V)
1.0
2.8
2.7
–40°C
2.6
+25°C
2.5
2.4 +85°C
2.3
2.2
2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN (V)
Figure 13. Frequency vs. Input Voltage Over Temperature (VOUT = 3.3 V)
50
45
40
35
30
25
20
15
10
5
02.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN (V)
Figure 14. Quiescent Current vs. Input Voltage (VOUT = 3.3 V)
Rev. D | Page 7 of 16

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