LM2596 Просмотр технического описания (PDF) - Estek Electronics Co. Ltd

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LM2596

3A Step-Down Voltage Regulator

Estek Electronics Co. Ltd 

LM2596

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

0C to +1500CStorage Temperature Range -65

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

-400CTJ+1250C

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)

 Efficiency

73 %

VIN=12V, ILOAD=3A

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)

 Efficiency

80 %

VIN=12V, ILOAD=3A

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)

 Efficiency

90 %

VIN=12V, ILOAD=3A

LM2596-ADJ

ELECTRICAL CHARACTERISTICS

BEIJING ESTEK ELECTRONICS CO.,LTD

2

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