Datasheet > RT1720

RT1720

更新时间： 2024-09-24 14:44:31

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
19页	1301K
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RT1720 技术参数

Status：	Active	Vin (min) (V)：	5
Vin (max) (V)：	80	Amplifier Ratio：
Channel Number：	1	Features：	Adjustable Current Limit;Enable Input;OCP;OVP
Package Type：	MSOP-10

RT1720 数据手册

RT1720

60V Hot Swap Controller with Fault Timer

General Description

The RT1720 features include, open-drain fault and

power-good outputs, and a shutdown input.

The RT1720 is an over-voltage and over-current

protection circuit. It monitors a circuit’s input voltage

and current with its adjustable over-voltage and

over-current thresholds and drives an external

N-MOSFET switch to connect the input to the output

voltage only when it is safe. Its wide input voltage

range makes it useful for high-voltage applications and

in systems that experience large transient voltages and

currents, such as automotive, telecom, and industrial

applications.

The RT1720 is available in the MSOP-10 package.

Features

 Wide Input Operation Range : 5V to 80V

 Negative Input Voltage Rating to −60V

 Adjustable Output Clamp Voltage

 Adjustable Over-Current Protection

 Programmable Timer for Fault Protection

 Low Shut Down Current

During over-voltage events, the RT1720 quickly

reduces the gate drive of the external MOSFET to

regulate the output voltage at the level chosen by its

external FB resistors. During over-current events, when

the load draws excessive current, the RT1720 reduces

the gate drive to regulate the output current at the level

set by its external current sense resistor. In both cases

the output voltage or current is linearly regulated,

thermally stressing the MOSFET load switch. However,

an externally-adjustable timer limits the duration of

MOSFET stress, eventually signaling a fault and then

turning off the MOSFET. The RT1720 then periodically

restarts operation to test if the fault has cleared. The

timer protects the MOSFET while allowing the load

circuit to temporarily operate normally through voltage

and current surges, such as load dump in automobiles

or spinning up disk drives.

 Internal Charge Pump N-MOSFET Drive

 Fast 80mA MOSFET Shut-off for Overvoltage

 Fault Output Indication

Applications

 Automotive/Avionic Surge Protection

 Hot Swap/Live Insertion

 High-Side Switch for Battery Powered Systems

 Intrinsic Safety Applications

Simplified Application Circuit

SNS

OUT

5V to 80V

= 60V

OUT_Max

OUT

VCC

SNS

SHDN

GATE

VOUT

RT1720

TMR

FLT

FAULT

TMR

PGOOD

POWER

GOOD

GND

is a registered trademark of Richtek Technology Corporation.

DS1720-01 November 2015

www.richtek.com

12 3 4 5 6 7...19

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