LM2576T-ADJ/NOPB National Semiconductor, LM2576T-ADJ/NOPB Datasheet



Manufacturer Part Number
National Semiconductor
Step-Down (Buck)r

Specifications of LM2576T-ADJ/NOPB

Internal Switch(s)
Synchronous Rectifier
Number Of Outputs
Voltage - Output
1.23 ~ 37 V
Current - Output
Frequency - Switching
Voltage - Input
4 ~ 40 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-5 (Straight Leads)
Current, Input Bias
50 nA
Current, Output
3 A
Current, Supply
5 mA
Frequency, Oscillator
52 kHz
Package Type
Regulator Type
Buck (Step-Down)
Resistance, Thermal, Junction To Case
2 °C/W
Temperature, Operating, Range
-40 to +125 °C
Voltage, Input
40 V
Voltage, Output
1.23 to 37 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
Lead Free Status / Rohs Status
RoHS Compliant part Electrostatic Device
Other names
© 2004 National Semiconductor Corporation
LM2576/LM2576HV Series
General Description
The LM2576 series of regulators are monolithic integrated
circuits that provide all the active functions for a step-down
(buck) switching regulator, capable of driving 3A load with
excellent line and load regulation. These devices are avail-
able in fixed output voltages of 3.3V, 5V, 12V, 15V, 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 LM2576 series offers a high-efficiency replacement for
popular three-terminal linear regulators. It substantially re-
duces the size of the heat sink, and in some cases no heat
sink is required.
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.
Other features include a guaranteed
put voltage within specified input voltages and output load
conditions, and
shutdown is included, featuring 50 µA (typical) standby cur-
rent. The output switch includes cycle-by-cycle current limit-
ing, as well as thermal shutdown for full protection under
fault conditions.
Typical Application
is a registered trademark of National Semiconductor Corporation.
10% on the oscillator frequency. External
(Fixed Output Voltage
4% tolerance on out-
3A Step-Down Voltage Regulator
n 3.3V, 5V, 12V, 15V, and adjustable output versions
n Adjustable version output voltage range,
n Guaranteed 3A output current
n Wide input voltage range, 40V up to 60V for
n Requires only 4 external components
n 52 kHz fixed frequency internal oscillator
n TTL shutdown capability, low power standby mode
n High efficiency
n Uses readily available standard inductors
n Thermal shutdown and current limit protection
n P+ Product Enhancement tested
n Simple high-efficiency step-down (buck) regulator
n Efficient pre-regulator for linear regulators
n On-card switching regulators
n Positive to negative converter (Buck-Boost)
1.23V to 37V (57V for HV version)
line and load conditions
HV version
4% max over

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LM2576T-ADJ/NOPB Summary of contents

Page 1

... Typical Application (Fixed Output Voltage Versions) SIMPLE SWITCHER ® registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation 3A Step-Down Voltage Regulator ® Features n 3.3V, 5V, 12V, 15V, and adjustable output versions n Adjustable version output voltage range, 1 ...

Page 2

... Output Voltage 5 LM2576HVS-12 LM2576HVS-15 LM2576HVS-ADJ LM2576S-12 LM2576S-15 LM2576SX-12 LM2576SX-15 LM2576HVT-12 LM2576HVT-15 LM2576HVT-ADJ LM2576T-12 LM2576T-15 LM2576HVT-12 LM2576HVT-15 LM2576HVT-ADJ Flow LB03 Flow LB03 LM2576T-12 LM2576T-15 Flow LB03 Flow LB03 2 01147602 NS Package Package Type ADJ Number TS5B TO-263 LM2576S-ADJ TS5B Tape & Reel LM2576SX-ADJ ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Supply Voltage LM2576 LM2576HV ON /OFF Pin Input Voltage Output Voltage to Ground (Steady State) Power Dissipation Storage Temperature Range Maximum Junction Temperature LM2576-3 ...

Page 4

LM2576-ADJ, LM2576HV-ADJ Electrical Characteristics Specifications with standard type face are for T Range. Symbol Parameter SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 V Feedback Voltage OUT V Feedback Voltage OUT LM2576 V Feedback Voltage OUT LM2576HV η Efficiency All ...

Page 5

All Output Voltage Versions Electrical Characteristics Specifications with standard type face are for T Range. Unless otherwise specified 30V for the 15V version 500 mA. LOAD Symbol Parameter DEVICE PARAMETERS θ Thermal Resistance JA θ ...

Page 6

... Physical Dimensions inches (millimeters) unless otherwise noted 5-Lead TO-220 (T) Order Number LM2576T-3.3, LM2576HVT-3.3, LM2576T-5.0, LM2576HVT-5.0, LM2576T-12, LM2576HVT-12, LM2576T-15, LM2576HVT-15, LM2576T-ADJ or LM2576HVT-ADJ NS Package Number T05A 21 ...

Page 7

... Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Order Number LM2576T-3.3 Flow LB03, LM2576T-XX Flow LB03, LM2576HVT-3.3 Flow LB03, LM2576T-5.0 Flow LB03, LM2576HVT-5.0 Flow LB03, LM2576T-12 Flow LB03, LM2576HVT-12 Flow LB03, LM2576T-15 Flow LB03, LM2576HVT-15 Flow LB03, LM2576T-ADJ Flow LB03 or LM2576HVT-ADJ Flow LB03 ...

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