LM2596 [HN]

3A 开关型、直流-直流降压转换电路。稳压压差要求2V,转换效率: 80-90% 应用:汽车电子,车载DVD,VCD,液晶显示器,液晶电视机; 3A开关型，直流 - 直流降压转换电路稳压压差要求2V ，转换效率： 80％-90％>应用：汽车电子，车载DVD ， VCD ，液晶显示器，液晶电视机


型号：	LM2596
厂家：	NANJING HONANO ELECTRONIC CO., LTD.
描述：	3A 开关型、直流-直流降压转换电路。稳压压差要求2V,转换效率: 80-90% 应用:汽车电子,车载DVD,VCD,液晶显示器,液晶电视机 3A开关型，直流 - 直流降压转换电路稳压压差要求2V ，转换效率： 80％-90％>应用：汽车电子，车载DVD ， VCD ，液晶显示器，液晶电视机显示器开关电视电子 CD DVD
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LM2596

Feb. 2009

LM2596

3A Step-Down Voltage Regulator

GENARAL DESCRIPTION

The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down

(buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. These devices are

available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include internal

frequency compensation†, and a fixed-frequency oscillator.

The LM2596 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than

what would be needed with lower frequency switching regulators. Available in a standard 5-lead TO-220 package with

several different lead bend options, and a 5-lead TO-263 surface mount package.

A standard series of inductors are available from several different manufacturers optimized for use with the LM2596

series. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a guaranteed 3% tolerance on output voltage under specified input voltage and output load

conditions, and 15% on the oscillator frequency. External shutdown is included,featuring typically 100 μA standby

current. Self protection features include a two stage frequency reducing current limit for the output switch and an over

temperature shutdown for complete protection under fault conditions.

APPLICATIONS

Simple high-efficiency step-down (buck) regulator

On-card switching regulators

Positive to negative converter

FEATURES

3.3V, 5V, 12V, and adjustable output versions

Adjustable version output voltage range, 1.2V to

37V 3% max over line and load conditions

Available in TO-220 and TO-263 packages

Guaranteed 3A output load current

Input voltage range up to 40V

Requires only 4 external components

Excellent line and load regulation specifications

150 kHz fixed frequency internal oscillator

TTL shutdown capability

Low power standby mode, IQ typically 100 μA

High efficiency

Uses readily available standard inductors

Thermal shutdown and current limit protection

ORDERING INFORMATION

Output Voltage

Package

Type

3.3

5.0

ADJ

LM2596S-3.3

LM2596T-3.3

LM2596S-5.0

LM2596T-5.0

LM2596S-12

LM2596T-12

LM2596S-ADJ

LM2596T-ADJ

TO-263

TO-220

PIN CONNECTION

Bent and Staggered Leads, Through Hole

Package

5-Lead TO-220 (T)

Surface Mount Package

5-Lead TO-263 (S)

Order Number LM2596S-3.3, LM2596S-5.0,

LM2596S-12 or LM2596S-ADJ

Order Number LM2596T-3.3, LM2596T-5.0,

LM2596T-12 or LM2596T-ADJ

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LM2596

TYPICAL APPLICATION (Fixed Output Voltage Versions)

BLOCK DIAGRAM

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LM2596

ABSOLUTE MAXIMUM RATINGS (Note 1)

Maximum Supply Voltage

45V Human Body Model (Note 2)

2 kV

Lead Temperature

S Package

Vapor Phase (60 sec.)

Infrared (10 sec.)

T Package (Soldering, 10 sec.)

Maximum Junction Temperature

ON /OFF Pin Input Voltage

Feedback Pin Voltage

Output Voltage to Ground (Steady State)

Power Dissipation

Storage Temperature Range

ESD Susceptibility

-0.3 dꢀV dꢀ+25V

-0.3 dꢀV d +25V

+215°C

+245°C

+260°C

+150°C

-1V

Internally limited

-65°C to +150°C

OPERATING RATINGS

Temperature Range

Supply Voltage

4.5v to 40V

-40°C T_J +125°C

LM2596-3.3 ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating Temperature Range.

LM2596-3.3

Units

(Limits)

Symbol

Parameter

Conditions

Type

Limit

(Note 4)

(Note 3)

SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1

3.3

V_OUT

Output Voltage

Efficiency

4.75V V_IN 40V, 0.2A I_LOAD 3A

3.2

3.4

V(Min)

V(Max)

V_IN= 12V, I_LOAD= 3A

LM2596-5.0 ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating Temperature Range.

LM2596-5.0

Units

(Limits)

Symbol

Parameter

Conditions

Type

Limit

(Note 4)

(Note 3)

SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1

5.0

7V V_IN 40V, 0.2A I_LOAD 3A

Circuit of Figure 2

V_OUT

Output Voltage

Efficiency

4.85

5.15

V(Min)

V(Max)

V_IN= 12V, I_LOAD= 3A

LM2596-12 ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating Temperature Range.

LM2596-12

Units

(Limits)

Symbol

Parameter

Conditions

Type

Limit

(Note 4)

(Note 3)

SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1

V_OUT

Output Voltage

Efficiency

15V V_IN 40V, 0.2A I_LOAD 3A

11.64

12.36

V(Min)

V(Max)

V_IN= 25V, I_LOAD= 3A

LM2596-ADJ ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating Temperature Range.

LM2596-ADJ

Units

(Limits)

Symbol

Parameter

Conditions

Type

Limit

(Note 4)

(Note 3)

SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1

4.5V V_IN 40V, 0.2A I_LOAD 3A

1.230

V_FB

Feedback Voltage V_OUTprogrammed for 3V, Circuit of

1.193

1.267

V(Min)

V(Max)

Figure 1

V_IN= 12V, V_OUT= 5V, I_LOAD= 3A

Efficiency

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LM2596

ALL OUTPUT VOLTAGE VERSIONS ELECTRICAL CHARACTERISTICS

Specifications with standard type face are for T_J= 25°C, and those with boldface type apply over full Operating Temperature Range.

Unless otherwise specified, V_IN= 12V for the 3.3V, 5V, and Adjustable version, V_IN= 24V for the 12V version. I_LOAD= 500 mA.

LM2596-XX

Units

(Limits)

Symbol

Parameter

Conditions

Type

Limit

(Note 3) (Note 4)

DEVICE PARAMETERS

I_b

Feedback Bias Current

Oscillator Frequency

Adjustable Version Only, V_FB= 1.3V

(Note 6)

50/100 nA (max)

kHz

127/110 kHz(Min)

173/173 kHz(Max)

150

f_O

1.16

V_SATSaturation Voltage

I_OUT= 3A (Note 7,8)

1.4/1.5

V(Max)

Max Duty Cycle (ON)

(Note 8)

(Note 9)

100

Min Duty Cycle (OFF)

4.5

I_CL

Current Limit

Peak Current (Notes 7, 8)

3.4

6.0

A(Min)

A(Max)

Output = 0V (Notes 7, 9)

Output = -1V (Notes 10)

μA(Max)

I_L

Output Leakage Current

Quiescent Current

mA(Max)

μA

I_Q

(Note 9)

100

I_STBYStandby Quiescent Current

ON /OFF Pin = 5V (OFF)

(Notes 10)

200/250 μA(Max)

ș_JC

TO-220 or TO-263 Package, Junction to Case

TO-220 Package, Junction to Ambient (Note 11)

TO-263 Package, Junction to Ambient (Note 12)

TO-263 Package, Junction to Ambient (Note 13)

ș_JA

ș_JAThermal Resistance

ș_JA

°C/W

ON /OFF CONTROL Test Circuit Figure 1

1.3

ON /OFF Pin Logic Input

Threshold Voltage

V_IH

V_IL

Low (Regulator ON)

High (Regulator OFF)

0.6

2.0

V(Max)

V(Min)

μA

μA(Max)

μA

I_IH

I_IL

V_LOGIC=2.5V (Regulator OFF)

V_LOGIC=0.5V (Regulator ON)

ON /OFF Pin Input

Current

0.02

μA(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 25°C 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: V_IN= 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 in²of (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 in²of (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 in²of copper on the other side of the p-c board.

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LM2596

TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1)

Normalized

Output Voltage

Line Regulation

Efficiency

Switch Saturation

Voltage

Switch Current Limit

Dropout Voltage

Operating

Quiescent Current

Shutdown

Quiescent Current

Minimum Operating

Supply Voltage

ON /OFF Threshold

Voltage

ON /OFF Pin

Current (Sinking)

Switching Frequency

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LM2596

TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1) (Continued)

Feedback Pin

Bias Current

Continuous Mode Switching Waveforms

V_IN= 20V, V_OUT= 5V, I_LOAD= 2A

Discontinuous Mode Switching Waveforms

V_IN= 20V, V_OUT= 5V, I_LOAD= 500 mA

L = 32 µH, C_OUT= 220 µF, C_OUTESR = 50 mΩ

L = 10 µH, C_OUT= 330 µF, C_OUTESR = 45 mΩ

Horizontal Time Base: 2 µs/div.

A: Output Pin Voltage, 10V/div.

Horizontal Time Base: 2 µs/div.

A: Output Pin Voltage, 10V/div.

B: Inductor Current 1A/div.

B: Inductor Current 0.5A/div.

C: Output Ripple Voltage, 50 mV/div.

C: Output Ripple Voltage, 100 mV/div.

Load Transient Response for Continuous Mode

V_IN= 20V, V_OUT= 5V, I_LOAD= 500 mA to 2A

L = 32 µH, C_OUT= 220 µF, C_OUTESR = 50 mΩ

Load Transient Response for Discontinuous Mode

V_IN= 20V, V_OUT= 5V, I_LOAD= 500 mA to 2A

L = 10 µH, C_OUT= 330 µF, C_OUTESR = 45 mΩ

Horizontal Time Base: 200 µs/div.

A: Output Voltage, 100 mV/div. (AC)

Horizontal Time Base: 100 µs/div.

A: Output Voltage, 100 mV/div. (AC)

B: 500 mA to 2A Load Pulse

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LM2596

TEST CIRCUIT AND LAYOUT GUIDELINES

Fixed Output Voltage Versions

— 470 µF, 50V, Aluminum Electrolytic Nichicon “PL Series”

— 220 µF, 25V Aluminum Electrolytic, Nichicon “PL Series”

OUT

D1 — 5A, 40V Schottky Rectifier, 1N5825

L1 — 68 µH, L38

Adjustable Output Voltage Versions

where V

= 1.23V

REF

Select R to be approximately 1 kΩ, use a 1% resistor for best stability.

— 470 µF, 50V, Aluminum Electrolytic Nichicon “PL Series”

— 220 µF, 35V Aluminum Electrolytic, Nichicon “PL Series”

OUT

D1 — 5A, 40V Schottky Rectifier, 1N5825

L1 — 68 µH, L38

R1 — 1 kΩ, 1%

— See Application Information Section

FIGURE 1. Standard Test Circuits and Layout Guides

As in any switching regulator, layout is very important. Rapidly switching currents associated with wiring inductance

can generate voltage transients which can cause problems. For minimal inductance and ground loops, the wires

indicated by heavy lines should be wide printed circuit traces and should be kept as short as possible. For best

results, external components should be located as close to the switcher lC as possible using ground plane

construction or single point grounding.

If open core inductors are used, special care must be taken as to the location and positioning of this type of inductor.

Allowing the inductor flux to intersect sensitive feedback, lC groundpath and C_OUTwiring can cause problems.

When using the adjustable version, special care must be taken as to the location of the feedback resistors and the

associated wiring. Physically locate both resistors near the IC, and route the wiring away from the inductor, especially

an open core type of inductor.

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LM2596 [HN]

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