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ADP7105ARDZ-1.8 Datasheet(数据表) 5 Page - Analog Devices

部件型号  ADP7105ARDZ-1.8
说明  20 V, 500 mA, Low Noise LDO Regulator with Soft Start
下载  28 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
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 5 page
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Data Sheet
ADP7105
Rev. 0 | Page 5 of 28
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Rating
VIN to GND
−0.3 V to +22 V
VOUT to GND
−0.3 V to +20 V
EN/UVLO to GND
−0.3 V to VIN
PG to GND
−0.3 V to VIN
SENSE/ADJ to GND
−0.3 V to VOUT
SS to GND
−0.3 V to +3.6 V
Storage Temperature Range
−65°C to +150°C
Operating Junction Temperature Range
−40°C to +125°C
Soldering Conditions
JEDEC J-STD-020
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 DATA
Absolute maximum ratings apply individually only, not in
combination. The ADP7105 can be damaged when the junction
temperature (TJ) limit is exceeded. Monitoring ambient
temperature does not guarantee that TJ is within the specified
temperature limits. In applications with high power dissipation
and poor printed circuit board (PCB) thermal resistance, the
maximum ambient temperature may need to be derated.
In applications with moderate power dissipation and low PCB
thermal resistance, the maximum ambient temperature can
exceed the maximum limit as long as the junction temperature
is within specification limits. The junction temperature (TJ) of
the device is dependent on the ambient temperature (TA), the
power dissipation of the device (PD), and the junction-to-ambient
thermal resistance of the package (θJA).
Maximum junction temperature (TJ) is calculated from the
ambient temperature (TA) and power dissipation (PD) using the
formula
TJ = TA + (PD × θJA)
Junction-to-ambient thermal resistance (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 applications 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 in. × 3 in. circuit
board. See JEDEC JESD51-7 and JESD51-9 for detailed
information on the board construction. For additional
information, see the AN-772 Application Note, A Design and
Manufacturing Guide for the Lead Frame Chip Scale Package
(LFCSP), available at www.analog.com.
ΨJB is the junction-to-board thermal characterization parameter
with units of °C/W. The package ΨJB is based on modeling and
calculation using a 4-layer board. JEDEC JESD51-12, Guidelines
for Reporting and Using Electronic Package Thermal Information,
states that thermal characterization parameters are not the same
as thermal resistances. ΨJB measures the component power
flowing through multiple thermal paths rather than through a
single path as in thermal resistance, θJB. Therefore, ΨJB thermal
paths include convection from the top of the package as well as
radiation from the package, factors that make ΨJB more useful
in real-world applications. Maximum junction temperature (TJ)
is calculated from the board temperature (TB) and power
dissipation (PD) using the formula
TJ = TB + (PD × ΨJB)
See JESD51-8 and JESD51-12 for more detailed information
about ΨJB.
THERMAL RESISTANCE
θJA and ΨJB are specified for the worst-case conditions, that is, a
device soldered in a circuit board for surface-mount packages.
θJC is a parameter for surface-mount packages with top
mounted heat sinks. θJC is presented here for reference only.
Table 4. Thermal Resistance
Package Type
θJA
θJC
ΨJB
Unit
8-Lead LFCSP
40.1
27.1
17.2
°C/W
8-Lead SOIC
48.5
58.4
31.3
°C/W
ESD CAUTION




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