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Micrel, Inc.

MIC2582/MIC2583

April 2009

17

M9999-043009-C

12V in this example, and the ON pin voltage exceeds its

threshold (VON) of 1.24V and the MIC2582/83 initiates a

start-up cycle. In Figure 6, the connection sense consisting

of a discrete logic-level MOSFET and a few resistors allows

for interrupt control from the processor or other signal

controller to shut off the output of the MIC2582/83. R4 pulls

the GATE of Q2 to V

IN

and the ON pin is held low until the

connectors are fully mated.

Once the connectors fully mate, a logic LOW at the

/ON_OFF signal turns Q2 off and allows the ON pin to pull

up above its threshold and initiate a start-up cycle. Applying

a logic HIGH at the /ON_OFF signal will turn Q2 on and

short the ON pin of the MIC2582/83 to ground which turns

off the GATE output charge pump.

Higher UVLO Setting

Once a PCB is inserted into a backplane (power supply), the

internal UVLO circuit of the MIC2582/83 holds the GATE

output charge pump off until VCC exceeds 2.2V. If VCC falls

ground and clears the overvoltage and/or current limit faults.

A typical 12V application, for example, should implement a

higher UVLO than the internal 2.1V threshold of MIC2582 to

avoid delivering power to downstream modules/loads while

the input is below tolerance. For a higher UVLO threshold,

the circuit in Figure 7 can be used to delay the output

MOSFET from switching on until the desired input voltage is

achieved. The circuit allows the charge pump to remain off

IN

exceeds

.

24

.

1

2

1

V

R

?/DIV>

+

The GATE drive output

will be shut down when V

IN

falls below

.

19

.

1

2

1

V

R

?/DIV>

+

In

the example circuit (Figure 7), the rising UVLO threshold is

set at approximately 9.5V and the falling UVLO threshold is

established as 9.1V. The circuit consists of an external

resistor divider at the ON pin that keeps the GATE output

charge pump off until the voltage at the ON pin exceeds its

threshold (V

ON

) and after the start-up timer elapses.

5V Switch with 3.3V Supply Generation

The MIC2582/83 can be configured to switch a primary

supply while generating a secondary regulated voltage rail.

The circuit in Figure 8 enables the MIC2582 to switch a 5V

supply while also providing a 3.3V low dropout regulated

supply with only a few added external components. Upon

enabling the MIC2582, the GATE output voltage increases

and thus the 3.3V supply also begins to ramp. As the 3.3V

output supply crosses 3.3V, the FB pin threshold is also

exceeded which triggers the power-on reset comparator.

The /POR pin goes HIGH, turning on transistor Q3 which

lowers the voltage on the gate of MOSFET Q2. The result is

a regulated 3.3V supply with the gate feedback loop of Q2

compensated by capacitor C3 and resistors R4 and R5. For

MOSFET Q2, special consideration must be given to the

power dissipation capability of the selected MOSFET as

1.5V to 2V will drop across the device during normal

operation in this application. Therefore, the device is

susceptible to overheating dependent upon the current

requirements for the regulated output. In this example, the

power dissipated by Q2 is approximately = 1W. However, a

substantial amount of power will be generated with higher

current requirements and/or conditions. As a general

guideline, expect the ambient temperature within the power

supply box to exceed the maximum operating ambient

temperature of the system environment by approximately

20篊. Given the MOSFETs R

?/DIV>

(JA)

and the expected power

dissipated by the MOSFET, an approximation for the

junction temperature at which the device will operate is

obtained as follows:

T

J

= (P

D

x R

?JA)

) + T

A

(10)

where T

A

= T

A

(MAX OPERATING)

+ 20篊. As a precaution, the

implementation of additional copper heat sinking is highly

recommended for the area under/around the MOSFET.

Figure 7. Higher UVLO Setting

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MIC2583R-MYQS	功能描述:熱插拔功率分布 Single-Channel Hot-Swap Controller - 200mV Fast-Trip Threshold - Lead Free RoHS:否制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
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型號(hào)：	MIC2583R-MBQS TR
廠商：	Micrel Inc
文件頁數(shù)：	17/25頁
文件大小：	826K
描述：	IC CTRLR HOT SWAP 200MV 16-QSOP
標(biāo)準(zhǔn)包裝：	2,500
類型：	熱交換控制器
應(yīng)用：	通用
內(nèi)部開關(guān)：	無
電源電壓：	2.3 V ~ 13.2 V
工作溫度：	-40°C ~ 85°C
安裝類型：	表面貼裝
封裝/外殼：	16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝：	16-QSOP
包裝：	帶卷 (TR)
其它名稱：	MIC2583R-MBQSTR MIC2583R-MBQSTR-ND

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