1 Features

• Integrated 7-mΩ high-side and 4.3-mΩ low-side

FET switches

• Adjustable current limit

• Adjustable output voltage from 0.6 V to VIN (100%

duty cycle capable), ±1% reference

• 2.95-V to 5.5-V input voltage range

• 500-kHz fixed switching frequency

• Start-up 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, OTP, UVLO, and power good

• Thermally enhanced 20-pin HTSSOP exposed pad

package

• Create a custom design using the LM21215 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 LM21215 is a monolithic synchronous point-ofload

buck regulator that is capable of delivering up

to 15 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, 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 LM21215 features internal overvoltage protection

(OVP) and resistor-programmable overcurrent

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. Start-up inrush currents are limited by

both an internally fixed and externally adjustable softstart

circuit. Fault detection and supply sequencing

are possible with the integrated power good circuit.

The LM21215 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. If the output is

prebiased at start-up, it will not sink current, allowing

the output to smoothly rise past the prebiased 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 heat sinks.