1 Features

1• Integrated 7-mΩ High Side and 4.3-mΩ Low-Side

FET Switches

• 300-kHz to 1.55-MHz Resistor-Adjustable

Frequency

• Adjustable Output Voltage from 0.6 V to VIN

(100% Duty Cycle Capable), ±1% Reference

• Input Voltage Range 2.95 V to 5.5 V

• Startup Into Prebiased 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 20-Pin HTSSOP Exposed

Pad Package

• Create a custom design using the LM21212-2 with

the WEBENCH® Power Designer

2 Applications

• Broadband, Networking and Wireless

Communications

• High-Performance FPGAs, ASICs and

Microprocessors

• Simple to Design, High Efficiency Point of Load

Regulation from a 5-V or 3.3-V Bus

3 Description

The LM21212-2 is a monolithic synchronous buck

regulator that is capable of delivering up to 12 A of

continuous output current while producing an output

voltage down to 0.6 V with outstanding efficiency.

The device is optimized to work over an input voltage

range of 2.95 V to 5.5 V, making it suitable for a wide

variety of low voltage systems. The voltage mode

control loop provides high noise immunity and narrow

duty-cycle capability, and it can be compensated to

be stable with any type of output capacitance,

providing maximum flexibility and ease of use.

The LM21212-2 features internal overvoltage

protection (OVP) and overcurrent protection (OCP)

for increased system reliability. A precision enable pin

and integrated UVLO allow turnon of the device to be

tightly controlled and sequenced. Start-up 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.