LM2576DC-DC Switching Power Supplies

Description 

The B2576 series of regulators are monolithic integrated circuit that provides all the active functions for a step -down (buck ) switching regulator , capable of driving 3 A load with excellent line and load regulation . The B2576 available in fixed output voltages of 3 . 3 V , 5 V , 1 2 Vand 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 B2576 series offers a high- efficiency replacement for popular three -terminal linear regulators . It substantially reduces 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 B2576 are available from several different manufacturers . This feature greatly simplifies the design of switch- mode power supplies . Other features include a guaranteed ± 4 % tolerance on output voltage within specified input voltages and output load conditions , and ± 1 0 % on the oscillator frequency . External shutdown is included , featuring 5 0 µ A ( typical ) standby current . The output switch includes cycle -by - cycle current limiting , as well as thermal shutdown for full protection under fault conditions . The B2576 is available in TO220T - 5 L and TO263 - 5 L package . 

Features 

3 . 3 V , 5 V , 1 2 V and adjustable output versions 

High efficiency 

Guaranteed 3 A output current 

Requires only 4 external components 

5 2 kHz fixed frequency internal oscillator 

TTL shutdown capability , low power standby mode 

Uses readily available standard inductors 

Thermal shutdown and current limit protection 

Adjustable version output voltage range , 1 . 2 3 V to 3 7 V ± 4 % max over line and load conditions

Simple high- efficiency step -down (buck ) regulator 

Efficient pre - regulator for linear regulators 

On - card switching regulators 

Positive to negative converter ( Buck-Boost )

LM2576DC-DC Switching Power Supplies parameter list

Operating Voltage (Vcc) (v):

4~40V

Output Current Iout (Max):

3A

Quiescent Power Consumption Iq (Typ):

80uA

Output Voltage Vout:

3.3V 5.0V 12V ADJ

Frequency (Hz):

52Khz

Efficiency (%):

87

Operating Temperature Range (℃):

-40~125°C

Package:

TO-220-5 TO-263-5

Alternative:

LM2576

• Power supply
• home appliance
• drone
• floor sweeper
• Medical device
• Multimedia audio power amplifier
• LED lighting
• Toy
• robot
• Instruments and meters
• industrial control
• Automotive Electronics

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