MOTOROLA LM2576 DATA SHEET
Summary
This high-efficiency monolithic integrated circuit serves as an ideal step-down (buck) switching regulator, simplifying the design of robust power supplies. Capable of fixed or adjustable outputs (3.3V to 15V), it ensures excellent line regulation while minimizing required external components. The accompanying technical manual provides hardware engineers and designers with comprehensive details on operating ratings, absolute maximum limits, typical circuit diagrams, and integration guidelines for reliable power conversion applications.
Page 1 Text Content
Order this document by LM2576/D
EASY SWITCHER
The LM2576 series of regulators are monolithic integrated circuits ideally
3.0 A STEP–DOWN
suited for easy and convenient design of a step–down switching regulator
(buck converter). All circuits of this series are capable of driving a 3.0 A load VOLTAGE REGULATOR
with excellent line and load regulation. These devices are available in fixed
output voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version. SEMICONDUCTOR
These regulators were designed to minimize the number of external TECHNICAL DATA 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
T SUFFIX
is significantly higher in comparison with popular three–terminal linear
PLASTIC PACKAGE
regulators, especially with higher input voltages. In many cases, the power
CASE 314D
dissipated is so low that no heatsink is required or its size could be reduced dramatically.
Pin 1. Vin
A standard series of inductors optimized for use with the LM2576 are 2. Output
available from several different manufacturers. This feature greatly simplifies 3. Ground 4. Feedback
the design of switch–mode power supplies.
5. ON/OFF
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 µA (typical) standby current. The output switch includes cycle–by–cycle current limiting, as well as thermal shutdown for full TV SUFFIX protection under fault conditions. PLASTIC PACKAGE
CASE 314B
Features 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
Heatsink surface connected to Pin 3.
Adjustable Version Output Voltage Range, 1.23 to 37 V ±4% Maximum Over Line and Load Conditions Guaranteed 3.0 A Output Current Wide Input Voltage Range
D2T SUFFIX Requires Only 4 External Components PLASTIC PACKAGE CASE 936A
52 k Hz Fixed Frequency Internal Oscillator
(D2PAK)
TTL Shutdown Capability, Low Power Standby Mode High Efficiency
Heatsink surface (shown as terminal 6 in case outline
Uses Readily Available Standard Inductors drawing) is connected to Pin 3. Thermal Shutdown and Current Limit Protection
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
Applications
LM2576–3.3 3.3 V
Simple High–Efficiency Step–Down (Buck) Regulator
LM2576–5 5.0 V
Efficient Pre–Regulator for Linear Regulators LM2576–12 12 V
LM2576–15 15 V
On–Card Switching Regulators
LM2576–ADJ 1.23 V to 37 V
Positive to Negative Converter (Buck–Boost) Negative Step–Up Converters ORDERING INFORMATION Power Supply for Battery Chargers
Operating Device Temperature Range Package
LM2576T–XX Straight Lead
LM2576TV–XX TJ = –40° to +125°C Vertical Mount LM2576D2T–XX Surface Mount
XX = Voltage Option, i.e. 3.3, 5, 12, 15 V; and ADJ for Adjustable Output.
Motorola, Inc. 1999 Rev 1, 07/1999
1MOTOROLA ANALOG IC DEVICE DATA
Page Summary Contents For MOTOROLA LM2576 DATA SHEET
Manual Details
| Brand | Motorola |
|---|---|
| Pages | 28 |
| File Size | 304.63 KB |
| Published | May 27, 2026 |
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Frequently Asked Questions
What is the output voltage range for adjustable versions?
The adjustable version supports an output voltage range of 1.23 V to 37 V ±4%.
How much current can the LM2576 regulators guarantee?
They are guaranteed to provide a 3.0 A output current.
Does the device require an external heatsink?
No, for both Case 314B and 314D, the product's dissipation is low enough that no heatsink is required or it can be significantly reduced.
What safety features are included by default?
Features include cycle–by–cycle current limiting and thermal shutdown protection under fault conditions.