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LM2677S-5.0 датащи(PDF) 5 Page - Texas Instruments

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номер детали LM2677S-5.0
подробное описание детали  LM2677 SIMPLE SWITCHER짰 High Efficiency 5A Step-Down Voltage Regulator
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LM2677S-5.0 датащи(HTML) 5 Page - Texas Instruments

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LM2677
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SNVS077I – MAY 2004 – REVISED JUNE 2012
All Output Voltage Versions Electrical Characteristics (continued)
Limits appearing in bold type face apply over the entire junction temperature range of operation,
−40°C to 125°C.
Specifications appearing in normal type apply for TA = TJ = 25°C. Unless otherwise specified VIN=12V for the 3.3V, 5V and
Adjustable versions and VIN=24V for the 12V version, Sync pin open circuited..
Symbol
Parameter
Conditions
Typ
Min
Max
Units
θJA
Thermal
NDZ Package, Junction to Ambient(1)
65
°C/W
Resistance
θJA
NDZ Package, Junction to Ambient(2)
45
θJC
NDZ Package, Junction to Case
2
θJA
KTW Package, Junction to Ambient(3)
56
θJA
KTW Package, Junction to Ambient(4)
35
θJA
KTW Package, Junction to Ambient(5)
26
θJC
KTW Package, Junction to Case
2
++
θJA
NHM Package, Junction to Ambient(6)
55
°C/W
θJA
NHM Package, Junction to Ambient(7)
29
(1)
Junction to ambient thermal resistance (no external heat sink) for the 7 lead TO-220 package mounted vertically, with ½ inch leads in a
socket, or on a PC board with minimum copper area.
(2)
Junction to ambient thermal resistance (no external heat sink) for the 7 lead TO-220 package mounted vertically, with ½ inch leads
soldered to a PC board containing approximately 4 square inches of (1 oz.) copper area surrounding the leads.
(3)
Junction to ambient thermal resistance for the 7 lead DDPAK/TO-263 mounted horizontally against a PC board area of 0.136 square
inches (the same size as the DDPAK/TO-263 package) of 1 oz. (0.0014 in. thick) copper.
(4)
Junction to ambient thermal resistance for the 7 lead DDPAK/TO-263 mounted horizontally against a PC board area of 0.4896 square
inches (3.6 times the area of the DDPAK/TO-263 package) of 1 oz. (0.0014 in. thick) copper.
(5)
Junction to ambient thermal resistance for the 7 lead DDPAK/TO-263 mounted horizontally against a PC board copper area of 1.0064
square inches (7.4 times the area of the DDPAK/TO-263 package) of 1 oz. (0.0014 in. thick) copper. Additional copper area will reduce
thermal resistance further. See the thermal model in Switchers Made Simple software.
(6)
Junction to ambient thermal resistance for the 14-lead VSON mounted on a PC board copper area equal to the die attach paddle.
(7)
Junction to ambient thermal resistance for the 14-lead VSON mounted on a PC board copper area using 12 vias to a second layer of
copper equal to die attach paddle. Additional copper area will reduce thermal resistance further. For layout recommendations, refer to
Application Note AN-1187 (SNOA401).
Copyright © 2004–2012, Texas Instruments Incorporated
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