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LM2596

Simple switcher Power Converter 150kHz 3A Step-Down Voltage Regulator

First Components International 

LM2596 Simple switcher Power Converter 150kHz

3A Step-Down Voltage Regulator

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 UA. 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 -650C to +1500C

ESD Susceptibility

Human Body Model (Note 2)

2 kV

Lead Temperature

S Package

Vapor Phase (60 sec.)

+2150C

Infrared (10 sec.)

+2450C

T Package (Soldering, 10 sec.)

+2600C

Maximum Junction Temperature

+1500C

OPERATING CONDITIONS

Temperature Range

Supply Voltage

-400C≤TJ≤+1250C

4.5V to 40V

LM2596-3.3

ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for TJ = 250C, and those with boldface type apply over full

Operating Temperature Range

Symbol

Parameter

Conditions

LM2596-3.3

Typ

Limit

(Note 3)

(Note 4)

Units

(Limits)

SYSTEM PARAMETERS (Note 5)Test Circuit Figure 1

VOUT Output Voltage

4.7V5≤VIN≤40V, 0.2A≤ILOAD≤3A

3.3

V

3.168/3.135 V(min)

3.432/3.465 V(max)

η

Efficiency

VIN=12V, ILOAD=3A

73

%

LM2596-5.0

ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for TJ = 250C, and those with boldface type apply over full

Operating Temperature Range

Symbol

Parameter

Conditions

LM2596-5.0

Typ

Limit

(Note 3)

(Note 4)

Units

(Limits)

SYSTEM PARAMETERS (Note 5)Test Circuit Figure 1

VOUT Output Voltage

7V≤VIN≤40V, 0.2A≤ILOAD≤3A

5.0

V

4.800/4.750 V(min)

5.200/5.250 V(max)

η

Efficiency

VIN=12V, ILOAD=3A

80

%

LM2596-12

ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for TJ = 250C, and those with boldface type apply over full

Operating Temperature Range

Symbol

Parameter

Conditions

LM2596-12

Typ

Limit

(Note 3)

(Note 4)

Units

(Limits)

SYSTEM PARAMETERS (Note 5)Test Circuit Figure 1

VOUT Output Voltage

15V≤VIN≤40V, 0.2A≤ILOAD≤3A

12.0

V

11.52/11.40 V(min)

12.48/12.60 V(max)

η

Efficiency

VIN=12V, ILOAD=3A

90

%

2

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