LM2596R-3.3_Datasheet

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3.0A, 150kHz, Step-Down Switching Regulator LM2596

Jan. 2015 - Rev. 1.4.2 - 1 - HTC

FEATURES

 3.3V, 5.0V, 12V, and Adjustable Output version

 Adjustable Output Voltage range, 1.2V to 37V

±4% Max. Over Line and Load conditions

 Guaranteed Output Current of 3A

 Available in TO-263, TO-220 Packages

 Requires Only 4 External Components

 Excellent Line and Load Regulation Specifications

 150kHz Fixed Frequency Internal Oscillator

 TTL Shutdown Capability

 Low Power Standby Mode, IQ typically 100mA

 Thermal Shutdown and Current Limit Protection

 Moisture Sensitivity Level 3

APPLICATION

 Simple High-Efficiency Step-Down(Buck) Regulator

 Efficient Pre-Regulator for Linear Regulators

 On-Card Switching Regulators

 Positive to Negative Converter(Buck-Boost)

 Negative Step-Up Converters

 Power Supply for Battery Chargers

DESCRIPSION

TO-263 PKG

TO-220 PKG

SOP8-PP PKG

1. Vin 2. Output 3. Ground 4. Feedback 5. On/Off

ORDERING INFORMATION

Device

Package

LM2596R-ADJ

TO-263 5L

LM2596R-X.X

LM2596T-ADJ

TO-220 5L

LM2596T-X.X

LM2596DP-ADJ

SOP8-PP

X.X = Output Voltage = 3.3, 5.0, 12

The LM2596 series of regulators are monolithic integrated circuits ideally suited for easy and convenient

design of a step-down switching regulator (buck converter). All circuits of this series are capable of driving a

3.0A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V,

5.0V,12V, and an adjustable output version. These regulators were designed to minimize the number of

external components to simplify the power supply design. Standard series of inductors optimized for use with

the LM2596 are offered by several different inductor manufacturers. Since the LM2596 converter is a switch-

mode power supply, its efficiency is significantly higher in comparison with popular three-terminal linear

regulators, especially with higher input voltages. In many cases, the power dissipated is so low that no heatsink

is required or its size could be reduced dramatically. A standard series of inductors optimized for use with the

LM2596 are available from several different manufacturers. This feature greatly simplifies the design of switch-

mode power supplies. The LM2596 features include a guaranteed +/- 4% tolerance on output voltage within

specified input voltages and output load conditions, and +/-15% on the oscillator frequency (+/- 2% over 0℃ to

125℃). External shutdown is included, featuring 80㎂ (typical) standby current. Self-protection features include

a two stage frequency reducing current limit for output switch and an over temperature shutdown for complete

protection under fault conditions.

Summary of content (8 pages)

PAGE 1
3.0A, 150kHz, Step-Down Switching Regulator LM2596 FEATURES TO-263 PKG  3.3V, 5.0V, 12V, and Adjustable Output version  Adjustable Output Voltage range, 1.2V to 37V 1 ±4% Max.
PAGE 2
3.0A, 150kHz, Step-Down Switching Regulator LM2596 Typical Application (Fixed Output Voltage Versions) L1 33uH Vin VIN Vout OUTPUT LM2596-5.0 ON/OFF Cin 680uF FEEDBACK GND Cout 220uF D1 1N5824 Absolute Maximum Ratings Rating Symbol Value Unit Maximum Supply Voltage Vin 45 V On/Off Pin Input Voltage - -0.3V ≤ V ≤ +Vin V Output Voltage to Ground (Steady-State) - - 1.
PAGE 3
.0A, 150kHz, Step-Down Switching Regulator LM2596 OPERATING RATINGS (Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see the Electrical Characteristics.) Rating Symbol Value.
PAGE 4
3.0A, 150kHz, Step-Down Switching Regulator Characteristics LM2596 Symbol Min TYP Max Unit All Output Voltage Versions Feedback Bias Current (Vout=5.0V [Adjustable Version Only]) Ib TJ=25℃ 11.52 12 12.48 11.4 - 12.6 TJ=25℃ 127 150 173 TJ= 0 ~ +125℃ 110 - 173 TJ=25℃ - 1.16 1.4 TJ= 0 ~ +125℃ - - 1.5 - 100 - % 3.6 4.5 6.9 A 3.4 - 7.5 - - 50 - 2 30 - 5 - - - 10 TJ=25℃ - 80 200 TJ= 0 ~ +125℃ - - 250 TJ=25℃ 2.0 1.3 - TJ= 0 ~ +125℃ 2.
PAGE 5
3.0A, 150kHz, Step-Down Switching Regulator LM2596 TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 2) Jan. 2015 - Rev. 1.4.
PAGE 6
3.0A, 150kHz, Step-Down Switching Regulator LM2596 TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 2) Jan. 2015 - Rev. 1.4.
PAGE 7
3.0A, 150kHz, Step-Down Switching Regulator LM2596 Test Circuit and Layout Guidelines CIN = 470㎌, 50V, COUT = 220㎌, 25V (Aluminum Electrolytic Nichicon "PL Series" D1 = 5A, 40V Schottky Rectifier, IN5825 L1 = 68uH, L38 Cin = 470 ㎌, 50V, Cout = 220 ㎌, 35V (Aluminum Electrolytic Nichicon "PL Series" D1 = 5A, 40V Schottky Rectifier, IN5825 L1 = 68uH, R1 = 1 ㏀, 1%, R2 = R1 x (Vout / Vref - 1) As in any switching regulator, layout is very important.
PAGE 8
3.0A, 150kHz, Step-Down Switching Regulator LM2596 PIN FUNCTION DESCRIPTION Package Symbol TO-220 5L Description SOP8-PP TO-263 5L 1 1 VIN 2 2 VOUT 3 3 GND 4 4 FEEDBACK 5 5 ON/OFF - 6, 7, 8 N.C. Jan. 2015 - Rev. 1.4.2 This pin is the positive input supply for the LM2596 step–down switching regulator. In order to minimize voltage transients and to supply the switching currents needed by the regulator, a suitable input bypass capacitor must be present.