Document
3.0A, 150kHz, Step-Down Switching Regulator
LM2596
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
TO-263 PKG
1 5
TO-220 PKG
15
SOP8-PP PKG
4 1
ORDERING INFORMATION Device
Package
LM2596R-X.X
TO-263-5L
LM2596T-X.X
TO-220-5L
LM2596DP-X.X
SOP-8PP
LM2596GDP-X.X
SOP-8PP
X.X = Output Voltage = 3.3, 5.0, 12, ADJ
DESCRIPTION
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 switchmode 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 switchmode 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.
Jan. 2016 - Rev. 1.4.4
-1 -
HTC
3.0A, 150kHz, Step-Down Switching Regulator
LM2596
Ordering Information
VOUT
Package
Order No.
SOP-8PP LM2596DP-ADJ
SOP-8PP LM2596GDP-ADJ ADJ
TO-220-5L LM2596T-ADJ
TO-263-5L LM2596R-ADJ
SOP-8PP LM2596DP-3.3
3.3V
SOP-8PP TO-220-5L
LM2596GDP-3.3 LM2596T-3.3
TO-263-5L LM2596R-3.3
SOP-8PP LM2596DP-5.0
5.0V
SOP-8PP TO-220-5L
LM2596GDP-5.0 LM2596T-5.0
TO-263-5L LM2596R-5.0
SOP-8PP LM2596DP-12
SOP-8PP LM2596GDP-12 12V
TO-220-5L LM2596T-12
TO-263-5L LM2596R-12
Description
Package Marking
3A, Adjustable, 150kHz, On/off LM2596-ADJ
3A, Adjustable, 150kHz, On/off LM2596G-ADJ
3A, Adjustable, 150kHz, On/off LM2596-ADJ
3A, Adjustable, 150kHz, On/off LM2596-ADJ
3A, Fixed, 150kHz, On/off
LM2596-3.3
3A, Fixed, 150kHz, On/off
LM2596G-3.3
3A, Fixed, 150kHz, On/off
LM2596-3.3
3A, Fixed, 150kHz, On/off
LM2596-3.3
3A, Fixed, 150kHz, On/off
LM2596-5.0
3A, Fixed, 150kHz, On/off
LM2596G-5.0
3A, Fixed, 150kHz, On/off
LM2596-5.0
3A, Fixed, 150kHz, On/off
LM2596-5.0
3A, Fixed, 150kHz, On/off
LM2596-12
3A, Fixed, 150kHz, On/off
LM2596G-12
3A, Fixed, 150kHz, On/off
LM2596-12
3A, Fixed, 150kHz, On/off
LM2596-12
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LM 2596
Output Voltage : 3.3V / 5.0V / 12V / ADJ
Package Type Material Class Root Name
DP : SOP8-PP T : TO220-5L R : TO263-5L
G : Halogen Free Blank : Pb Free
Product Code
Jan. 2016 - Rev. 1.4.4
-2 -
HTC
3.0A, 150kHz, Step-Down Switching Regulator
PIN CONFIGURATION
VIN 1 VOUT 2
GND 3 FEEDBACK 4
Exposed PAD
8 N/C 7 N/C 6 N/C 5 ON/OFF
SOP8-PP
TO220-5L
ON/OFF FEEDBACK GND VOUT VIN
LM2596
ON/OFF FEEDBACK GND VOUT VIN
TO263-5L
PIN DESCRIPTION
Package
TO-220 5L TO-263 5L
SOP8-PP
Symbol
Description
This pin is the positive input supply for the LM2596 step–down
1
1
VIN
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.
This is the emitter of the internal switch. The saturation voltage
2
2
VOUT
Vsat of this output switch is typically 1.5 V. It should be kept in mind that the PCB area connected to this pin should be kept to a
minimum in order to minimize coupling .