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PDF LM2596 Data sheet ( Hoja de datos )

Número de pieza LM2596
Descripción 3A Step-Down Voltage Regulator
Fabricantes HN 
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LM2596
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-d own
(buck) s witching regul ator, ca pable of drivin g a 3A loa d with exc ellent li ne an d loa d regul ation. T hese devices ar e
available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version.
Requiring a minimum num ber of external compone nts, t hese regulat ors are simple to use and include inter nal
frequency compensation†, and a fixed-frequency oscillator.
The LM2596 series operates at a s witching frequency of 150 kHz thus allo wing smaller sized filter components than
what would be needed with lower frequency switching regulators. Available in a standar d 5-lead TO-220 package with
several different lead bend options, and a 5-lead TO-263 surface mount package.
A standard ser ies of inductor s are available from several different manufact urers optimized for use with the LM2596
series. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ± 4% t olerance on output voltage under specified input voltage and output load
conditions, and ± 15% on the osci llator fre quency. E xternal sh utdown is incl uded, feat uring t ypically 80 µ A stand by
current. Self protection featur es include a t wo stage frequency reducing current limit for the output s witch and an over
temperature shutdown for complete protection under fault conditions.
FEATURES
ƒ 3.3V, 5V, 12V, and adjustable output versions
ƒ Adjustable v ersion output voltage range, 1.2V to
37V ±4% max over line and load conditions
ƒ Available in TO-220 and TO-263 packages
ƒ Guaranteed 3A output load current
ƒ Input voltage range up to 40V
ƒ Requires only 4 external components
ƒ Excellent line and load regulation specifications
ƒ 150 kHz fixed frequency internal oscillator
ƒ TT L shutdown capability
ƒ Low power standby mode, IQ typically 80 µA
ƒ High efficiency
ƒ Uses readily available standard inductors
ƒ Thermal shutdown and current limit protection
APPLICATIONS
ƒ Simple high-efficiency step-down (buck) regulator
ƒ On-card switching regulators
ƒ Positive to negative converter
ORDERING INFORMATION
Output Voltage
3.3 5.0
12
LM2596S-3.3
LM2596S-5.0
LM2596S-12
LM2596T-3.3
LM2596T-5.0
LM2596T-12
PIN CONNECTION
Bent and Staggered Leads, Through Hole
Package
5-Lead TO-220 (T)
ADJ
LM2596S-ADJ
LM2596T-ADJ
Package
Type
TO-263
TO-220
Surface Mount Package
5-Lead TO-263 (S)
Order Number LM2596T-3.3, LM2596T-5.0,
LM2596T-12 or LM2596T-ADJ
1
Order Number LM2596S-3.3, LM2596S-5.0,
LM2596S-12 or LM2596S-ADJ
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LM2596 pdf
TYPICAL PERFORMANCE CHARACTERISTICS (Circuit of Figure 1)
Normalized
Output Voltage
Line Regulation
LM2596
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
5

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