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PDF LM2576 Data sheet ( Hoja de datos )
| Número de pieza | LM2576 | |
| Descripción | Step-Down Switching Regulator | |
| Fabricantes | HTC | |
| Logotipo |  |
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3A, 52kHz, Step-Down Switching Regulator
LM2576
FEATURES
z 3.3V, 5.0V, 12V and Adjustable Output Versions
z Adjustable Version Output Voltage Range, 1.23 to 37V
+/- 4% AG10Maximum Over Line and Load Conditions
z Guaranteed 3.0A Output Current
z Wide Input Voltage Range
z Requires Only 4 External Components
z 52kHz Fixed Frequency Internal Oscillator
z TTL Shutdown Capability, Low Power Standby Mode
z High Efficiency
z Uses Readily Available Standard Inductors
z Thermal Shutdown and Current Limit Protection
z Moisture Sensitivity Level 3 for SMD packages
SOP8-PP PKG
TO-220 PKG
TO-263 PKG
APPLICATION
z Simple High-Efficiency Step-Down(Buck) Regulator
z Efficient Pre-Regulator for Linear Regulators
z On-Card Switching Regulators
z Positive to Negative Converter(Buck-Boost)
z Negative Step-Up Converters
z Power Supply for Battery Chargers
ORDERING INFORMATION
Device
Marking
LM2576DP-X.X
LM2576-X.X
LM2576T-X.X
LM2576-X.X
LM2576R-X.X
LM2576-X.X
Package
SOP8-PP
TO-220
TO-263
DESCRIPTION
The LM2576 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 LM2576 are offered by several different inductor
manufacturers.
Since the LM2576 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 LM2576 are available from several
different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. The LM2576
features include a guaranteed +/- 4% tolerance on output voltage within specified input voltages and output
load conditions, and +/-10% on the oscillator frequency (+/- 2% over 0˚C to 125˚C).
External shutdown is included, featuring 80㎂(typical) standby current. The output switch includes cycle-
bycycle current limiting, as well as thermal shutdown for full protection under fault conditions.
Dec 2011 – Rev. 1.3
-1 -
HTC
1 page  
3A, 52kHz, Step-Down Switching Regulator
LM2576
ABSOLUTE MAXIMUM RATINGS
(Absolute Maximum Ratings indicate limits beyond which damage to the device may occur)
Rating
Symbol
Value
Maximum Supply Voltage
On/Off Pin Input Voltage
Output Voltage to Ground (Steady-State)
Power Dissipation
SOP8-PP 8Lead
Thermal Resistance, Junction to Ambient
Thermal Resistance, Junction to Case
TO-220 5Lead
Thermal Resistance, Junction to Ambient
Thermal Resistance, Junction to Case
TO-263 5Lead
Thermal Resistance, Junction to Ambient
Thermal Resistance, Junction to Case
Storage Temperature Range
Minimum ESD Rating(Human Body Model:
C=100 pF, R=1.5kΩ
Lead Temperature (Soldering, 10seconds)
Maximum Junction Temperature
Vin
-
-
PD
θJA
θJC
PD
θJA
θJC
PD
θJA
θJC
TSTG
-
-
TJ
45
-0.3V ≤ V ≤ +Vin
-1.0
Internally Limited
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Internally Limited
65
5
Internally Limited
70
5
-60 to +150
2.0
260
150
UNIT
V
V
V
W
℃/W
℃/W
W
℃/W
℃/W
W
℃/W
℃/W
℃
kV
℃
℃
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.
Unit
Operating Junction Temperature Range
TJ
-40 to +125
℃
Supply Voltage
Vin 40 V
Dec 2011 – Rev. 1.3
-5 -
HTC
5 Page 
3A, 52kHz, Step-Down Switching Regulator
LM2576
Cin - 100µF, 75V, Aluminium Electrolytic
Cout - 1000µF, 25V, Aluminium Electrolytic
D1 - Schottky, MBR360
L1 -100 µH, Pulse Eng. PE-92108
R1 - 2.0 k, 0.1%
R2 - 6.12 k, 0.1%
Vout
=
Vref
(1.0
+
R2
R1
)
R2
=
R1(
Vout
Vref
- 1.0)
Where Vref = 1.23V, R1 between 1.0k and 5.0k
Figure 15. Typical Test Circuit
Dec 2011 – Rev. 1.3
- 11 -
HTC
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LM2576.PDF ] | |
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