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1 Features

1? Integrated 7-mΩ high-side and 4.3-mΩ low-side

FET switches

? 300-kHz to 1.5-MHz frequency SYNC pin

? 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

? Start-up Into prebiased loads

? Output voltage tracking capability

? Wide bandwidth voltage loop error amplifier

? Adjustable soft-start with external capacitor

? Precision enable (EN) pin with hysteresis

? Integrated OVP, OCP, OTP, UVLO and powergood

? Thermally enhanced HTSSOP-20 exposed pad

package

? Create a custom design using the LM21212-1 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 LM21212-1 is a monolithic synchronous point-ofload

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

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, providing maximum flexibility and ease

of use.

The LM21212-1 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.

The LM21212-1 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 synchronized to the falling edge of a clock

between frequencies of 300 kHz to 1.5 MHz.