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.