LM2596 datasheet(2/12 Pages) ESTEK

2 / 12 page

PIN FUNCTIONS

+VIN - This is the positive input supply for the IC switching

regulator. A suitable input bypass capacitor must be present at

this pin to minimize voltage transients and to supply the

switching currents needed by the regulator.

Ground - Circuit ground.

Output - Internal switch. The voltage at this pin switches

between (+VIN - VSAT ) and approximately -0.5V, with a duty

cycle of approximately VOUT /VIN. To minimize coupling to

sensitive circuitry, the PC board copper area connected to this

pin should be kept to a minimum.

Feedback —Senses the regulated output voltage to complete

the feedback loop.

ON/OFF - Allows the switching regulator circuit to be shut

down using logic level signals thus dropping the total input

supply current to approximately 80 µA. Pulling this pin below a

threshold voltage of approximately 1.3V turns the regulator on,

and pulling this pin above 1.3V (up to a maximum of 25V)

shuts the regulator down. If this shutdown feature is not needed,

the ON /OFF pin can be wired to the ground pin or it can be left

open, in either case the regulator will be in the ON condition.

ABSOLUTE MAXIMUM RATINGS (Note 1)

Maximum Supply Voltage

45V

ON /OFF Pin Input Voltage -0.3

≤ V ≤ +25V

Feedback Pin Voltage

-0.3

≤ V ≤+25V

Output Voltage to Ground

(Steady State)

-1V

Power Dissipation

Internally limited

Storage Temperature Range -65

0C to +1500C

ESD Susceptibility

Human Body Model (Note 2)

2 kV

Lead Temperature

S Package

Vapor Phase (60 sec.)

+215

Infrared (10 sec.)

+245

T Package (Soldering, 10 sec.)

+260

Maximum Junction Temperature

+150

OPERATING CONDITIONS

Temperature Range

-40

≤T

J≤+125

Supply Voltage

4.5V to 40V

LM2596-3.3

ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for TJ = 25

0C, and those with boldface type apply over full Operating Temperature

Range

LM2596-3.3

Symbol

Parameter

Conditions

Typ

(Note 3)

Limit

(Note 4)

Units

(Limits)

SYSTEM PARAMETERS (Note 5)Test Circuit Figure 1

VOUT

Output Voltage

4.7V5

≤V

IN≤40V, 0.2A≤ILOAD≤3A

3.3

3.168/3.135

3.432/3.465

V(min)

V(max)

Efficiency

VIN=12V, ILOAD=3A

LM2596-5.0

ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for TJ = 25

0C, and those with boldface type apply over full Operating Temperature

Range

LM2596-5.0

Symbol

Parameter

Conditions

Typ

(Note 3)

Limit

(Note 4)

Units

(Limits)

SYSTEM PARAMETERS (Note 5)Test Circuit Figure 1

VOUT

Output Voltage

≤V

IN≤40V, 0.2A≤ILOAD≤3A

5.0

4.800/4.750

5.200/5.250

V(min)

V(max)

Efficiency

VIN=12V, ILOAD=3A

LM2596-12

ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for TJ = 25

0C, and those with boldface type apply over full Operating Temperature

Range

LM2596-12

Symbol

Parameter

Conditions

Typ

(Note 3)

Limit

(Note 4)

Units

(Limits)

SYSTEM PARAMETERS (Note 5)Test Circuit Figure 1

VOUT

Output Voltage

15V

≤V

IN≤40V, 0.2A≤ILOAD≤3A

12.0

11.52/11.40

12.48/12.60

V(min)

V(max)

Efficiency

VIN=12V, ILOAD=3A

LM2596-ADJ

ELECTRICAL CHARACTERISTICS

BEIJING ESTEK ELECTRONICS CO.,LTD

LM2596

3AStep-Down VoltageRegulator

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