LM2575

The LM2575 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, 12V, or 15V fixed output. Adjustable versions have an output voltage range from 1.23V to 37V. Both versions are capable of driving a 1A 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 LM2575 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 LM2575 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.

Features
  • 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 1A 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
Parameter
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 1 1
Quiescent Current (mA) typ 10 10
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
Documents
LM2575 - 52 kHz Simple 1A Buck RegulatorData Sheets11/05/2015152KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
LM2575-12WT5TO-220-40C to +85CTUBE**********
LM2575-12WU5DDPAK-40C to +85CTUBE**********
LM2575-12WU-TR5DDPAK-40C to +85CT/R**********
LM2575-12YN16PDIP-40C to +85CTUBE**********
LM2575-12YWM24SOIC-40C to +85CTUBE**********
LM2575-12YWM-TR24SOIC-40C to +85CT/R**********
LM2575-3.3WT5TO-220-40C to +85CTUBE**********
LM2575-3.3WU5DDPAK-40C to +85CTUBE**********
LM2575-3.3WU-TR5DDPAK-40C to +85CT/R2.161.801.641.371.26
LM2575-3.3YN16PDIP-40C to +85CTUBE**********
LM2575-3.3YWM24SOIC-40C to +85CTUBE**********
LM2575-3.3YWM-TR24SOIC-40C to +85CT/R**********
LM2575-5.0WT5TO-220-40C to +85CTUBE**********
LM2575-5.0WU5DDPAK-40C to +85CTUBE2.081.741.581.321.22
LM2575-5.0WU-TR5DDPAK-40C to +85CT/R**********
LM2575-5.0YN16PDIP-40C to +85CTUBE**********
LM2575-5.0YWM24SOIC-40C to +85CTUBE**********
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
LM2575-3.3YN1.1127001.83333316PDIP.300inMatte Tine3
LM2575-12YN1.1127001.83333316PDIP.300inMatte Tine3
LM2575-5.0YN1.1127001.83333316PDIP.300inMatte Tine3
LM2575YN1.1127001.83333316PDIP.300inMatte Tine3
LM2575-5.0WT1.9839003.1200005TO-220-Matte Tine3
LM2575-12WT1.9839003.1200005TO-220-Matte Tine3
LM2575-3.3WT1.9839003.1200005TO-220-Matte Tine3
LM2575WT1.9839003.1200005TO-220-Matte Tine3
LM2575-5.0WU1.4625002.5200005DDPAK-Matte Tine3
LM2575-5.0WU-TR1.4625002.0533335DDPAK-Matte Tine3
LM2575-12WU1.4625002.5200005DDPAK-Matte Tine3
LM2575-12WU-TR1.4625002.0533335DDPAK-Matte Tine3
LM2575-3.3WU1.4625002.5200005DDPAK-Matte Tine3
LM2575-3.3WU-TR1.4625002.0533335DDPAK-Matte Tine3
LM2575WU1.4625002.5200005DDPAK-Matte Tine3
LM2575WU-TR1.4625002.0533335DDPAK-Matte Tine3
LM2575-3.3YWM0.6620001.22580724SOIC.300inMatte Tine3
LM2575-3.3YWM-TR0.6620001.00000024SOIC.300inMatte Tine3
LM2575-12YWM0.6620001.22580724SOIC.300inMatte Tine3
LM2575-12YWM-TR0.6620001.00000024SOIC.300inMatte Tine3
LM2575-5.0YWM0.6620001.22580724SOIC.300inMatte Tine3
LM2575-5.0YWM-TR0.6620001.00000024SOIC.300inMatte Tine3
LM2575YWM0.6620001.22580724SOIC.300inMatte Tine3
LM2575YWM-TR0.6620001.00000024SOIC.300inMatte Tine3
LM2575 - 52 kHz Simple 1A Buck Regulator LM2575
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