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National Products from Texas Instruments LM21305 5A Adjustable Frequency Synchronous Buck Regulators

Texas Instruments LM21305 5A Adjustable Frequency Synchronous Buck Regulators

Texas Instruments LM21305 5A Adjustable Frequency Synchronous Buck Regulators are optimized for solution size, flexibility, and high conversion efficiency. High power density LM21305 designs are achieved via monolithic integration of the high-side and low-side power MOSFETs, high switching frequency, current mode control, and optimized thermal design. The efficiency of National LM21305 buck regulators is elevated at light loads with diode emulation mode operation and at heavy loads by optimal design of the MOSFET gate drivers to minimize switch dead-times and body-diode conduction losses. TI LM21305 synchronous buck regulators accept a wide input voltage range of 3V to 18V, facilitating interface to all intermediate bus voltages, including 3.3V, 5V, and 12V rails. An output voltage as low as 0.598V is supported with excellent setpoint accuracy and low ripple and RMS noise.

Features
  • High efficiency switcher core with integrated low RDSon power MOSFETs
  • Resistor programmable switching frequency with frequency synchronization
  • Internal soft-start with monotonic and pre-biased startup
  • Low shutdown quiescent current
  • Precision enable with hysteresis
  • PGOOD indicator function
  • Input under-voltage lock-out (UVLO)
  • Output over-voltage protection (OVP)
  • High-bandwidth load transient response with peak current-mode control
  • Cycle-by-cycle current limiting
  • Thermal shutdown
Key Specifications
  • Single-rail input voltage range from 3V to 18V
  • 0.598V feedback voltage reference
  • 300kHz to 1.5MHz switching frequency range
  • LLP-28 package (5x5x0.8mm, 0.5mm pitch)
Applications
  • POL regulation from 3.3V, 5V, and 12V supply rails
  • High efficiency supply for DSPs, FPGAs, ASICs and processors
  • Broadband, networking and optical communications infrastructure

Typical Application Circuit

Typical Application Circuit
  • Texas Instruments
  • Power Management
  • Semiconductors|Integrated Circuits|IC-Power Management