LM2576

The LM2576 series of monolithic integrated circuits provide all the active functions for a step-down (buck) switching regulator. Fixed versions are available with a 3.3V, 5V, or 12V fixed output. Adjustable versions have an output voltage range from 1.23V to 37V. Both versions are capable of driving a 3A load with excellent line and load regulation.

These regulators are simple to use because they require a minimum number of external components and include internal frequency compensation and a fixed-frequency oscillator.

The LM2576 series offers a high efficiency replacement for popular three-terminal adjustable linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required.

A standard series of inductors available from several different manufacturers are ideal for use with the LM2576 series. This feature greatly simplifies the design of switch-mode power supplies.

The feedback voltage is guaranteed to ±2% tolerance for adjustable versions, and the output voltage is guaranteed to ±3% for fixed versions, within specified input voltages and output load conditions. The oscillator frequency is guaranteed to±10%. External shutdown is included, featuring less than 200µA standby current. The output switch includes cycle-by-cycle current limiting and thermal shutdown for full protection under fault conditions.

产品特性
  • 3.3V, 5V, 12V, and adjustable output versions
  • Voltage over specified line and load conditions:
  • Fixed version: ±3% max. output voltage
  • Adjustable version: ±2% max. feedback voltage
  • Guaranteed 3A output current
  • Wide input voltage range: 4V to 40V
  • Wide output voltage range: 1.23V to 37V
  • Requires only 4 external components
  • 52kHz fixed frequency internal oscillator
  • Low power standby mode IQ typically < 200µA
  • 80% efficiency (adjustable version typically > 80%)
  • Uses readily available standard inductors
  • Thermal shutdown and current limit protection
  • 100% electrical thermal limit burn-in
技术参数
Parameter Name Value Value
Regulator Type Step Down (Buck) Step Down (Buck)
# of Outputs 1 1
Input Voltage Range Min (V) 4 4
Input Voltage Range Max (V) 40 40
Output Voltage Range Min (V) 1.23 1.23
Output Current (A) max 3 3
Quiescent Current (mA) typ 30 30
Switching Frequency (kHz) 52 52
Operating Temp Range -40 to 125 -40 to 125
Vfb (V) 1.23 1.23
Duty Cycle Max (%) 0.98 0.98
SHUTDOWN Current (µA) (Typ) 50 50
文档资料
LM2576 - 52 kHz Simple 3A Buck RegulatorData Sheets11/05/201557KB
订购型号
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
LM2576-12WT5TO-220-40C to +85CTUBE**********
LM2576-5.0WT5TO-220-40C to +85CTUBE**********
LM2576-5.0WU5DDPAK-40C to +85CTUBE2.161.801.641.371.26
LM2576-5.0WU-TR5DDPAK-40C to +85CT/R2.161.801.641.371.26
LM2576WT5TO-220-40C to +85CTUBE**********
LM2576WU5DDPAK-40C to +85CTUBE**********
器件无铅环保信息
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
LM2576-12WT1.9839003.1200005TO-220-Matte Tine3
LM2576-3.3WT1.9839003.1200005TO-220-Matte Tine3
LM2576-5.0WT1.9839003.1200005TO-220-Matte Tine3
LM2576WT1.9839003.1200005TO-220-Matte Tine3
LM2576-12WU1.4625002.5200005DDPAK-Matte Tine3
LM2576-12WU-TR1.4625002.0533335DDPAK-Matte Tine3
LM2576-3.3WU1.4625002.5200005DDPAK-Matte Tine3
LM2576-3.3WU-TR1.4625002.0533335DDPAK-Matte Tine3
LM2576-5.0WU1.4625002.5200005DDPAK-Matte Tine3
LM2576-5.0WU-TR1.4625002.0533335DDPAK-Matte Tine3
LM2576WU1.4625002.5200005DDPAK-Matte Tine3
LM2576WU-TR1.4625002.0533335DDPAK-Matte Tine3
LM2576 - 52 kHz Simple 3A Buck Regulator LM2576
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