Datasheet > LT3581

LT3581

更新时间： 2023-12-20 18:46:22

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
36页	461K
描述
具故障保护功能的 3.3A、升压 / 负输出 DC/DC 转换器

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LT3581 数据手册

LT3581

3.3A Boost/Inverting DC/DC

Converter with Fault Protection

FEATURES

DESCRIPTION

The LT^®3581 is a PWM DC/DC converter with built-in fault

protection features to aid in protecting against output

shorts, input/output overvoltages, and overtemperature

conditions. The part consists of a 42V master switch, and

a 42V slave switch that can be tied together for a total

current limit of 3.3A.

3.3A, 42V Combined Power Switch

Master/Slave (1.9A/1.4A) Switch Design

Output Short Circuit Protection

Wide Input Range: 2.5V to 22V Operating,

40V Maximum Transient

Switching Frequency Up to 2.5MHz

Easily Configurable as a Boost, SEPIC, Inverting or

Flyback Converter

User Configurable Undervoltage Lockout

The LT3581 is ideal for many local power supply designs. It

canbeeasilyconfiguredinBoost,SEPIC,InvertingorFlyback

configurations, and is capable of generating 12V at 830mA,

or –12V at 625mA from a 5V input. In addition, the LT3581’s

slaveswitchallowstheparttobeconfiguredinhighvoltage,

high power charge pump topologies that are very efficient

and require fewer components than traditional circuits.

Low V

Switch: 250mV at 2.75A (Typical)

CESAT

Can be Synchronized to External Clock

Can Be Synchronized to other Switching Regulators

High Gain SHDN Pin Accepts Slowly Varying Input

Signals

TheLT3581’sswitchingfrequencyrangecanbesetbetween

200kHz and 2.5MHz. The part may be clocked internally at

a frequency set by the resistor from the RT pin to ground,

or it may be synchronized to an external clock. A buffered

version of the clock signal is driven out of the CLKOUT

pin, and may be used to synchronize other compatible

switching regulator ICs to the LT3581.

14-Pin 4mm × 3mm DFN and 16-Lead MSE Packages

APPLICATIONS

Local Power Supply

Vacuum Fluorescent Display (VFD) Bias Supplies

TFT-LCD Bias Supplies

Automotive Engine Control Unit (ECU) Power

TheLT3581alsofeaturesinnovativeSHDNpincircuitrythat

allows for slowly varying input signals and an adjustable

undervoltage lockout function. Additional features such

as frequency foldback and soft-start are integrated. The

LT3581 is available in 14-Pin 4mm × 3mm DFN and 16-

Lead MSE packages.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Protected by U.S. Patents, including 7579816.

Efficiency and Power Loss vs

Load Current

TYPICAL APPLICATION

100

2000

1800

1600

1400

1200

1000

800

Output Short Protected, 5V to 12V Boost Converter Operating at 2MHz

1.5µH

OUT

12V

830mA

4.7µF

130k

6.04k

SW1 SW2

18.7k

GATE

100k

FAULT

4.7µF

SHDN

CLKOUT

600

LT3581

4.7µF

10k

400

56pF

SYNC

10.5k

1nF

43.2k

200

GND

0.1µF

3581 TA01

200

600

LOAD CURRENT (mA)

800

1000

400

3581 TA01b

3581fb

For more information www.linear.com/LT3581

12 3 4 5 6 7...36

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与LT3581相关器件

型号	品牌	描述	获取价格	数据表
LT3581EDE#PBF	Linear	LT3581 - 3.3A Boost/Inverting DC/DC Converter with Fault Protection; Package: DFN; Pins: 1	获取价格
LT3581EDE#TRPBF	Linear	LT3581 - 3.3A Boost/Inverting DC/DC Converter with Fault Protection; Package: DFN; Pins: 1	获取价格
LT3581EDE-PBF	Linear	3.3A Boost/Inverting DC/DC Converter with Fault Protection	获取价格
LT3581EDE-TRPBF	Linear	3.3A Boost/Inverting DC/DC Converter with Fault Protection	获取价格
LT3581EMSE#PBF	Linear	LT3581 - 3.3A Boost/Inverting DC/DC Converter with Fault Protection; Package: MSOP; Pins:	获取价格
LT3581EMSE#TRPBF	Linear	LT3581 - 3.3A Boost/Inverting DC/DC Converter with Fault Protection; Package: MSOP; Pins:	获取价格

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