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LTC4449IDCBTRPBF

更新时间： 2024-11-11 05:43:59

品牌	Logo	应用领域
凌特 - Linear		驱动器
页数	文件大小	规格书
12页	164K
描述
High Speed Synchronous N-Channel MOSFET Driver

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LTC4449IDCBTRPBF 数据手册

LTC4449

High Speed Synchronous

N-Channel MOSFET Driver

FEATURES

DESCRIPTION

The LTC^®4449 is a high frequency gate driver that

is designed to drive two N-Channel MOSFETs in a

synchronous DC/DC converter. The powerful rail-to-rail

driver capability reduces switching losses in MOSFETs

with high gate capacitance.

4V to 6.5V V Operating Voltage

38V Maximum Input Supply Voltage

Adaptive Shoot-Through Protection

Rail-to-Rail Output Drivers

3.2A Peak Pull-Up Current

4.5A Peak Pull-Down Current

The LTC4449 features a separate supply for the input logic

to match the signal swing of the controller IC. If the input

signalisnotbeingdriven,theLTC4449activatesashutdown

modethatturnsoffbothexternalMOSFETs.Theinputlogic

signalisinternallylevel-shiftedtothebootstrappedsupply,

which functions at up to 42V above ground.

8ns TG Risetime Driving 3000pF Load

7ns TG Falltime Driving 3000pF Load

Separate Supply to Match PWM Controller

Drives Dual N-Channel MOSFETs

Undervoltage Lockout

Low Proﬁle (0.75mm) 2mm × 3mm DFN Package

The LTC4449 contains undervoltage lockout circuits on

both the driver and logic supplies that turn off the external

MOSFETs when an undervoltage condition is present. An

adaptive shoot-through protection feature is also built-in

to prevent the power loss resulting from MOSFET cross-

conduction current.

APPLICATIONS

Distributed Power Architectures

High Density Power Modules

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

The LTC4449 is available in the 2mm × 3mm DFN

package.

TYPICAL APPLICATION

Synchronous Buck Converter Driver

LTC4449 Driving 3000pF Capacitive Loads

4V TO 6.5V

INPUT (IN)

5V/DIV

BOOST

TO 38V

LOGIC

LTC4449

GND

TOP GATE

(TG - TS)

5V/DIV

OUT

PWM

BOTTOM GATE

(BG) 5V/DIV

4449 TA01a

4449 TA01b

10ns/DIV

4449f

12 3 4 5 6 7...12

中文翻译

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