LM2596-ADJMDC【PDF 32/36 页】7.5 A SWITCHING REGULATOR, 173 kHz SWITC

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Sheet目录39246

28页 29页 30页 31页 [32页]33页 34页 35页 36页

All Output Voltage Versions

Electrical Characteristics (Continued)

Specifications with standard type face are for T

J = 25C, and those with boldface type apply over full Operating Tempera-

ture Range. Unless otherwise specified, V

IN = 12V for the 3.3V, 5V, and Adjustable version and VIN = 24V for the 12V ver-

sion. I

LOAD = 500 mA

Symbol

Parameter

Conditions

LM2596-XX

Units

(Limits)

Typ

(Note 3)

Limit

(Note 4)

ON /OFF Pin Input Current

LOGIC = 2.5V (Regulator OFF)

A(max)

LOGIC = 0.5V (Regulator ON)

0.02

A(max)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is

intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.

Note 3: Typical numbers are at 25C and represent the most likely norm.

Note 4: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%

production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to

calculate Average Outgoing Quality Level (AOQL).

Note 5: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator

system performance. When the LM2596 is used as shown in the

Figure 1 test circuit, system performance will be as shown in system parameters section of Electrical

Characteristics.

Note 6: The switching frequency is reduced when the second stage current limit is activated.

Note 7: No diode, inductor or capacitor connected to output pin.

Note 8: Feedback pin removed from output and connected to 0V to force the output transistor switch ON.

Note 9: Feedback pin removed from output and connected to 12V for the 3.3V, 5V, and the ADJ. version, and 15V for the 12V version, to force the output transistor

switch OFF.

Note 10: VIN = 40V.

Note 11: Junction to ambient thermal resistance (no external heat sink) for the TO-220 package mounted vertically, with the leads soldered to a printed circuit board

with (1 oz.) copper area of approximately 1 in2.

Note 12: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single printed circuit board with 0.5 in2 of (1 oz.) copper area.

Note 13: Junction to ambient thermal resistance with the TO-263 package tab soldered to a single sided printed circuit board with 2.5 in2 of (1 oz.) copper area.

Note 14: Junction to ambient thermal resistance with the TO-263 package tab soldered to a double sided printed circuit board with 3 in2 of (1 oz.) copper area on

the LM2596S side of the board, and approximately 16 in2 of copper on the other side of the p-c board. See Application Information in this data sheet and the thermal

model in Switchers Made Simple version 4.3 software.

Typical Performance Characteristics (Circuit of Figure 1)

Normalized

Output Voltage

Line Regulation

Efficiency

01258304

01258305

01258306

LM2596

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