MB3842

更新时间： 2024-02-24 15:04:19

品牌	Logo	应用领域
富士通 - FUJITSU		开关
页数	文件大小	规格书
19页	142K
描述
Power Management 2-ch Switch IC

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中文翻译

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技术参数
数据手册

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MB3842 技术参数

是否Rohs认证：	不符合	生命周期：	Transferred
包装说明：	,	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.32	Is Samacsys：	N
模拟集成电路 - 其他类型：	POWER SUPPLY SUPPORT CIRCUIT	Base Number Matches：	1

MB3842 数据手册

MB3842/MB3845

■ FUNCTIONAL DESCRIPTION

Current Limit Setting

By placing resistance between the CS and GND pins, the current limit can be set between 100mA and 600mA

within ±30% accuracy (V^IN= 5 V, current limit at 600mA). Because the setting value is dependent on V^INvoltage,

the user should select the optimum resistance value for the value of V^INvoltage . When the switching current

exceeds the set value, the OC pin goes to “L” level as an external notification signal, but there is no latching

function. To hold operation on “off” state, the input signal to the EN and EN pins should be used.

When a direct connection to GND is used, there is no current limitation.

When the connection is open, the switch is in a state of continuously held current limits.

Thermal Shutdown

The MB3842/MB3845 has a thermal shutdown function which turns the switch off and sets the latch to protect

the device when junction temperature exceeds 125°C.

At the same time the OC output signal goes to “L” level to notify external systems.

The latch function can be reset by sending a low signal to the EN input of the MB3842, or a high signal to the

EN input of the MB3845.

Slow Start

The on/off switching time can be delayed by applying capacitance between the SS and GND pins. Controlling

the on time can soften surge current to the load side capacitance when power is turned on.

For details, see “Css vs. t^ON(SS) characteristics” on p. 9.

UVLO

A V^INvoltage monitoring function is provided, so that when V^INvoltage exceeds 2.3 V (typ) the OC pin voltage

goes to “H” level. When V^INvoltage falls below 2.1V (typ), the OC output goes to “L” state.

Error Flag OC Pin

The OC pin produces a “L” signal in case of a UVLO, overcurrent, or over-temperature condition. In case of

overcurrent, the output has a pulse waveform. See P12.

(note) Output current limit setting resistance values are shown on P9, and in the following table. (CS pin-to-GND)

Standard Values

V^IN/I^SW

V^IN5.0V

V^IN3.3V

V^IN2.5V

0.1 A

0.2 A

0.3 A

0.4 A

0.5 A

0.6 A

0.7 A

0.8 A

0.9 A

1.0 A

6.2 kΩ 4.3 kΩ 3.3 kΩ 2.7 kΩ 2.2 kΩ 2.0 kΩ 1.8 kΩ 1.6 kΩ 1.4 kΩ 1.3 kΩ

9.1 kΩ 5.6 kΩ 4.3 kΩ 3.3 kΩ 2.7 kΩ 2.4 kΩ 2.0 kΩ 1.8 kΩ 1.6 kΩ 1.5 kΩ

13 kΩ

7.5 kΩ 5.1 kΩ 3.9 kΩ 3.0 kΩ 2.7 kΩ 2.2 kΩ 2.0 kΩ 1.8 kΩ 1.6 kΩ

1...10 11 121314 15 16...19

中文翻译

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