Texas Instruments LM21212-2

Description

The LM21212-2 is a monolithic synchronous buck regulator that is capable of delivering up to 12A of continuous output current while producing an output voltage down to 0.6V with outstanding efficiency. The device is optimized to work over an input voltage range of 2.95V to 5.5V, making it suited for a wide variety of low voltage systems. The voltage mode control loop provides high noise immunity, narrow duty cycle capability and can be compensated to be stable with any type of output capacitance, providingmaximum flexibility and ease of use. The LM21212-2 features internal over voltage protection (OVP) and over-current protection (OCP) for increased system reliability. A precision enable pin and integrated UVLO allow turn-on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good circuit.The LM21212-2 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track an external voltage rail using the SS/TRK pin. The switching frequency can be programmed between 300 kHz and 1.55 MHz with an external resistor.If the output is pre-biased at startup, it will not sink current, allowing the output to smoothly rise past the pre-biased voltage. The regulator is offered in a 20- pin HTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heatsinks.

Features

• Integrated 7.0 m ohm High Side and 4.3 m ohm Low Side FET Switches
• 300 kHz to 1.55 MHz Resistor-Adjustable Frequency
• 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 HTSSOP-20 Exposed Pad Package

Typical applications

• High-Performance FPGAs, ASICs and Microprocessors
• Simple to Design, High Efficiency Point of Load Regulation from a 5V or 3.3V Bus.
• Broadband, Networking and Wireless communication

More information

• Datasheet
• IC product information