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LM27222

更新时间： 2024-10-27 04:44:35

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器
页数	文件大小	规格书
11页	602K
描述
High-Speed 4.5A Synchronous MOSFET Driver

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LM27222 数据手册

March 2006

LM27222

High-Speed 4.5A Synchronous MOSFET Driver

General Description

Features

n Adaptive shoot-through protection

n 10ns dead time

The LM27222 is a dual N-channel MOSFET driver designed

to drive MOSFETs in push-pull configurations as typically

used in synchronous buck regulators. The LM27222 takes

the PWM output from a controller and provides the proper

timing and drive levels to the power stage MOSFETs. Adap-

tive shoot-through protection prevents damaging and effi-

ciency reducing shoot-through currents, thus ensuring a ro-

bust design capable of being used with nearly any MOSFET.

The adaptive shoot-through protection circuitry also reduces

the dead time down to as low as 10ns, ensuring the highest

operating efficiency. The peak sourcing and sinking current

for each driver of the LM27222 is about 3A and 4.5Amps

respectively with a Vgs of 5V. System performance is also

enhanced by keeping propagation delays down to 8ns. Effi-

ciency is once again improved at all load currents by sup-

porting synchronous, non-synchronous, and diode emulation

modes through the LEN pin. The minimum output pulse

width realized at the output of the MOSFETs is as low as

30ns. This enables high operating frequencies at very high

conversion ratios in buck regulator designs. To support low

power states in notebook systems, the LM27222 draws only

5µA from the 5V rail when the IN and LEN inputs are low or

floating.

n 8ns propagation delay

n 30ns minimum on-time

n 0.4Ω pull-down and 0.9Ω pull-up drivers

n 4.5A peak driving current

n MOSFET tolerant design

n 5µA quiescent current

n 30V maximum input voltage in buck configuration

n 4V to 6.85V operating voltage

n SO-8 and LLP packages

Applications

n High Current Buck And Boost Voltage Converters

n Fast Transient DC/DC Power Supplies

n Single Ended Forward Output Rectification

n CPU And GPU Core Voltage Regulators

Typical Application

20117902

FIGURE 1.

DS201179

www.national.com

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与LM27222相关器件

型号	品牌	获取价格	描述	数据表
LM27222_15	TI	获取价格	LM27222 High-Speed 4.5A Synchronous MOSFET Driver
LM27222M	NSC	获取价格	High-Speed 4.5A Synchronous MOSFET Driver
LM27222M	TI	获取价格	LM27222 High-Speed 4.5A Synchronous MOSFET Driver
LM27222M/NOPB	NSC	获取价格	IC HALF BRDG BASED MOSFET DRIVER, PDSO8, ROHS COMPLIANT, SOP-8, MOSFET Driver
LM27222M/NOPB	TI	获取价格	LM27222 High-Speed 4.5A Synchronous MOSFET Driver
LM27222MX	NSC	获取价格	High-Speed 4.5A Synchronous MOSFET Driver
LM27222MX/NOPB	TI	获取价格	LM27222 High-Speed 4.5A Synchronous MOSFET Driver
LM27222SD	NSC	获取价格	High-Speed 4.5A Synchronous MOSFET Driver
LM27222SD	TI	获取价格	LM27222 High-Speed 4.5A Synchronous MOSFET Driver
LM27222SD/NOPB	NSC	获取价格	IC 3.2 A HALF BRDG BASED MOSFET DRIVER, DSO8, LEAD FREE, LLP-8, MOSFET Driver