lm21215mhx National Semiconductor Corporation, lm21215mhx Datasheet

lm21215mhx

Manufacturer Part Number

lm21215mhx

Description

15a High Efficiency Synchronous Buck Regulator

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM21215MHX.pdf (24 pages)

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15A High Efficiency Synchronous Buck Regulator

General Description

The LM21215 is a monolithic synchronous buck regulator that

is capable of delivering up to 15A of continuous output current

while producing an output voltage down to 0.6V with out-

standing 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 capa-

bility and can be compensated to be stable with any type of

output capacitance, providing maximum flexibility and ease of

use.

The LM21215 features internal over voltage protection (OVP)

and resistor-programmable over-current protection (OCP) for

increased system reliability. A precision enable pin and inte-

grated UVLO allow turn-on of the device to be tightly con-

trolled 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 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 pre-biased at startup, it will not sink current,

allowing the output to smoothly rise past the pre-biased volt-

age. The regulator is offered in a 20-pin eTSSOP package

with an exposed pad that can be soldered to the PCB, elimi-

nating the need for bulky heatsinks.

Simplified Application Circuit

PowerWise

is a registered trademark of National Semiconductor Corporation.

301037

LM21215

Features

■

Applications

■

Integrated 7.0 mΩ high side and 4.3 mΩ low side FET

switches

Adjustable current limit

Adjustable output voltage from 0.6V to V

cycle capable), ±1% reference

Input voltage range 2.95V to 5.5V

500 kHz fixed switching frequency

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, OTP, UVLO and Power-Good

Thermally Enhanced eTSSOP-20 exposed pad package

Broadband, networking and wireless communications

High-performance FPGAs, ASICs and microprocessors

Simple to design, high efficiency point of load regulation

from a 5V or 3.3V bus

February 24, 2011

30103701

(100% duty

www.national.com

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