Texas Instruments LM21305

Description

The LM21305 is a full-featured 5A synchronous buck POL regulator optimized for solution size, flexibilty, 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 the LM21305 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.The LM21305 accepts 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
• 3V to 18V Single-Rail Input Voltage
• 0.598V Feedback Voltage Reference
• 300 kHz to 1.5 MHz Switching Frequency
• WQFN-28 Package (5 x 5 x 0.8 mm, 0.5 mm Pitch)

Typical applications

• POL Regulation From 3.3V, 5V, and 12V
• Broadband, Networking and Optical
• High Efficiency Supply for DSPs, FPGAs,

More information

• Datasheet
• IC product information