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Part: LM2576TV-15
Category:
Power Management
-> DC-DC Converters
-> Step-down
Description: Easy Switchere 3.0 a Step-down Voltage Regulator
Company: Motorola Semiconductor Products
Datasheet: Download LM2576TV-15 datasheet File size : 745 kB
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Advance Information
LM2576
EASY SWITCHERTM 3.0 A STEPDOWN VOLTAGE REGULATOR
SEMICONDUCTOR TECHNICAL DATA
Easy SwitcherTM 3.0 A Step-Down Voltage Regulator
The LM2576 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a stepdown switching regulator (buck converter). All circuits of this series are capable of driving a 3.0 A load 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. 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 switchmode power supply, its efficiency is significantly higher in comparison with popular threeterminal 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 switchmode 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 µA (typical) standby current. The output switch includes cyclebycycle current limiting, as well as thermal shutdown for full protection under fault conditions. Features
T SUFFIX PLASTIC PACKAGE CASE 314D Pin 1. 2. 3. 4. 5. Vin Output Ground Feedback ON/OFF 1 5
TV SUFFIX PLASTIC PACKAGE CASE 314B Heatsink surface connected to Pin 3.
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5
· · · · · · · · · · · · · · · ·
3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions 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 Requires Only 4 External Components 52 kHz Fixed Frequency Internal Oscillator TTL Shutdown Capability, Low Power Standby Mode High Efficiency Uses Readily Available Standard Inductors Thermal Shutdown and Current Limit Protection
Heatsink surface (shown as terminal 6 in case outline drawing) is connected to Pin 3.
D2T SUFFIX PLASTIC PACKAGE CASE 936A (D2PAK)
1 5
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
LM25763.3 LM25765 LM257612 LM257615 LM2576ADJ 3.3 V 5.0 V 12 V 15 V 1.23 V to 37 V
Applications Simple HighEfficiency StepDown (Buck) Regulator Efficient PreRegulator for Linear Regulators OnCard Switching Regulators Positive to Negative Converter (BuckBoost) Negative StepUp Converters Power Supply for Battery Chargers
ORDERING INFORMATION
Device LM2576TXX LM2576TVXX Operating Temperature Range Package Straight Lead
TJ = 40° to +125°C Vertical Mount Surface Mount LM2576D2TXX
XX = Voltage Option, i.e. 3.3, 5, 12, 15 V; and ADJ for Adjustable Output.
This document contains information on a new product. Specifications and information herein are subject to change without notice.
© Motorola, Inc. 1997
Rev 0
MOTOROLA ANALOG IC DEVICE DATA
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LM2576
Figure 1. Block Diagram and Typical Application Typical Application (Fixed Output Voltage Versions)
Feedback 7.0 V 40 V Unregulated DC Input +Vin Cin 100 µF 1 3 Gnd 5 LM2576 4 Output 2 ON/OFF L1 100 µH D1 1N5822 5.0 V Regulated Output 3.0 A Load Cout 1000 µF
Representative Block Diagram and Typical Application
+Vin 1 Cin 4 Feedback R2 Fixed Gain Error Amplifier Comparator Current Limit
Unregulated DC Input
3.1 V Internal Regulator
ON/OFF
ON/OFF 5
Output Voltage Versions 3.3 V 5.0 V 12 V 15 V For adjustable version R1 = open, R2 = 0
R2 () 1.7 k 3.1 k 8.84 k 11.3 k
R1 1.0 k
Driver Freq Shift 18 kHz 52 kHz Oscillator Latch Output 1.0 Amp Switch Reset Thermal Shutdown 2 Gnd 3 D1 L1
Regulated Output Vout Cout Load
1.235 V BandGap Reference
ABSOLUTE MAXIMUM RATINGS (Absolute Maximum Ratings indicate limits beyond
which damage to the device may occur.) Rating Maximum Supply Voltage ON/OFF Pin Input Voltage Output Voltage to Ground (SteadyState) Power Dissipation Case 314B and 314D (TO220, 5Lead) Thermal Resistance, JunctiontoAmbient Thermal Resistance, JunctiontoCase Case 936A (D2PAK) Thermal Resistance, JunctiontoAmbient Thermal Resistance, JunctiontoCase Storage Temperature Range Minimum ESD Rating (Human Body Model: C = 100 pF, R = 1.5 k) Lead Temperature (Soldering, 10 seconds) Maximum Junction Temperature
NOTE: ESD data available upon request.
Symbol Vin PD RJA RJC PD RJA RJC Tstg TJ
Value 45 0.3 V V +Vin 1.0 Internally Limited 65 5.0 Internally Limited 70 5.0 65 to +150 2.0 260 150
Unit V V V W °C/W °C/W W °C/W °C/W °C kV °C °C
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MOTOROLA ANALOG IC DEVICE DATA
LM2576
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 and test conditions, see the Electrical Characteristics.) Rating Operating Junction Temperature Range Supply Voltage Symbol TJ Vin Value 40 to +125 40 Unit °C V
SYSTEM PARAMETERS ([Note 1] Test Circuit Figure 15)
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Vin = 12 V for the 3.3 V, 5.0 V, and Adjustable version, Vin = 25 V for the 12 V version, and Vin = 30 V for the 15 V version. ILoad = 500 mA. For typical values TJ = 25°C, for min/max values TJ is the operating junction temperature range that applies [Note 2], unless otherwise noted.)
Characteristics LM25763.3 ([Note 1] Test Circuit Figure 15) Output Voltage (Vin = 12 V, ILoad = 0.5 A, TJ = 25°C) Output Voltage (6.0 V Vin 40 V, 0.5 A ILoad 3.0 A) TJ = 25°C TJ = 40 to +125°C Efficiency (Vin = 12 V, ILoad = 3.0 A) LM25765 ([Note 1] Test Circuit Figure 15) Output Voltage (Vin = 12 V, ILoad = 0.5 A, TJ = 25°C) Output Voltage (8.0 V Vin 40 V, 0.5 A ILoad 3.0 A) TJ = 25°C TJ = 40 to +125°C Efficiency (Vin = 12 V, ILoad = 3.0 A) LM257612 ([Note 1] Test Circuit Figure 15) Output Voltage (Vin = 25 V, ILoad = 0.5 A, TJ = 25°C) Output Voltage (15 V Vin 40 V, 0.5 A ILoad 3.0 A) TJ = 25°C TJ = 40 to +125°C Efficiency (Vin = 15 V, ILoad = 3.0 A) LM257615 ([Note 1] Test Circuit Figure 15) Output Voltage (Vin = 30 V, ILoad = 0.5 A, TJ = 25°C) Output Voltage (18 V Vin 40 V, 0.5 A ILoad 3.0 A) TJ = 25°C TJ = 40 to +125°C Efficiency (Vin = 18 V, ILoad = 3.0 A) LM2576 ADJUSTABLE VERSION ([Note 1] Test Circuit Figure 15) Feedback Voltage (Vin = 12 V, ILoad = 0.5 A, Vout = 5.0 V, TJ = 25°C) Feedback Voltage (8.0 V Vin 40 V, 0.5 A ILoad 3.0 A, Vout = 5.0 V) TJ = 25°C TJ = 40 to +125°C Efficiency (Vin = 12 V, ILoad = 3.0 A, Vout = 5.0 V) Vout Vout 1.193 1.18 1.23 77 1.267 1.28 % 1.217 1.23 1.243 V V Vout Vout 14.4 14.25 15 88 15.6 15.75 % 14.7 15 15.3 V V Vout Vout 11.52 11.4 12 88 12.48 12.6 % 11.76 12 12.24 V V Vout Vout 4.8 4.75 5.0 77 5.2 5.25 % 4.9 5.0 5.1 V V Vout Vout 3.168 3.135 3.3 75 3.432 3.465 % 3.234 3.3 3.366 V V Symbol Min Typ Max Unit
NOTES: 1. External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. When the LM2576 is used as shown in the Figure 15 test circuit, system performance will be as shown in system parameters section. 2. Tested junction temperature range for the LM2576: Tlow = 40°C Thigh = +125°C
MOTOROLA ANALOG IC DEVICE DATA
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