LM21212/15 High-Efficiency, High-Current Buck Regulators


National's 12A and 15A Synchronous Buck Regulator from the PowerWise® Family


National Semiconductor - LM21212-1/5 High-Efficiency, High-Current Buck Regulators National Semiconductor introduces a pair of high-current, synchronous buck regulators with the industry’s highest efficiency at 97 percent. The LM21212-1 and LM21215 are well-suited for high-performance FPGAs, ASICs and microprocessors used in a variety of low-voltage applications including wireless, networking and optical communications infrastructure. Members of National’s PowerWise® energy-efficient product family, the LM21212-1 and LM21215 feature integrated high-side and low-side FETs, which simplify design and reduce solution size. The LM21212-1 features an output current up to 12A with synchronizable switching frequency and the LM21215 provides a resistor-programmable current limit, allowing up to 15A of continuous output current, offering the industry’s best power density. Both products provide peak efficiency greater than 97 percent from a 5V input to 3.3V output, and greater than 92 percent efficiency when regulating a 1.2V output from a 5V input.

   Features - LM21212-1    Features - LM21215
  • Integrated 7.0mΩ high side and 4.3mΩ low side
    FET switches
  • 300kHz to 1.5MHz frequency SYNC pin
  • Adjustable output voltage from 0.6V to VIN
    (100% duty cycle capable), ±1% reference
  • Input voltage range 2.95V to 5.5V
  • Startup into pre-biased loads
  • Output voltage tracking capability
  • Wide bandwidth voltage loop error amplifier
  • Adjustable soft-start with external capacitor
  • Precision enable pin with hysteresis
  • Integrated OVP, OCP, OTP, UVLO and Power-Good
  • Thermally enhanced eTSSOP-20 package
  • Integrated 7.0mΩ high side and 4.3mΩ low side FET switches
  • Adjustable current limit
  • Adjustable output voltage from 0.6V to VIN
    (100% duty cycle capable), ±1% reference
  • Input voltage range 2.95V to 5.5V
  • 500kHz fixed switching frequency
  • Startup into pre-biased loads
  • Output voltage tracking capability
  • Wide bandwidth voltage loop error amplifier
  • Adjustable soft-start with external capacitor
  • Precision enable pin with hysteresis
  • Integrated OVP, OTP, UVLO and Power-Good
  • Thermally enhanced eTSSOP-20 package

   Applications
  • Broadband, networking and wireless communications
  • High-performance FPGAs, ASICs and microprocessors
  • Simple to design, high efficiency point of load regulation from a 5V or 3.3V bus

Digi-Key Part Number Description Package  
   LM21212MH-1/NOPB-ND    LM21212MH-1/NOPB   12A High Efficiency Synchronous Buck Regulator
   with Frequency Synchronization
LM21212MH-1/NOPB Datasheet
   LM21212MH-2/NOPB-ND    LM21212MH-2/NOPB LM21212MH-2/NOPB Datasheet
   LM21215MH/NOPB-ND    LM21215MH/NOPB   15A High Efficiency Synchronous Buck Regulator LM21215MH/NOPB Datasheet