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參數(shù)資料
| 型號(hào)： | MIC2754-SBM5 |
| 廠商： | MICREL INC |
| 元件分類： | 電源管理 |
| 英文描述： | Power Supply Supervisors Preliminary Information |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 124K |
| 代理商： | MIC2754-SBM5 |
MIC2753/2754
Micrel
MIC2753/2754
10
June 1999
Microcontroller
VCC
Manual
Reset
MIC2754
IN
HV
MR
RST
V
CC
RST IN
GND
Fuse
R
100k
MCR708A
SCR
2200pF
10k
MIC94030
1k
22
GND
Figure 2a. MIC2754 Valid Reset Below 1.5V
Microcontroller
VCC
Manual
Reset
MIC2753
HV
MR
RST
V
CC
IN
RST IN
GND
Fuse
R
PULL-UP
MCR708A
SCR
2200pF
10k
MIC94030
1k
22
GND
Figure 2b. MIC2753 Valid Reset Below 1.5V
Microcontroller
VCC
Manual
Reset
MIC2754
IN
HV
MR
RST
V
CC
RST IN
GND
GND
Fuse
MCR708A
SCR
R
4.7k
BUFFER
/RST signal to
other circuits
2200pF
10k
MIC94030
1k
22
Figure 3. MIC2754 With Processors Using Bidirectional Reset Inputs.
Crowbar Applications
The following MIC275x applications diagrams show an SCR
crowbar circuit. The function of this circuit is to protect system
components from damage caused by excessive supply volt-
age, as might be generated by a runaway power supply. The
low R
DS(on)
of the MIC94030 P-channel MOSFET (<1
at
V
GS
= 4.5V) and the 22
resistor assure adequate gate
current to trigger the SCR.
The crowbar circuit is designed to be functional over all
operating ranges of the MIC275x. Since the lowest upper-
threshold voltage of the MIC275x family is only 3.08V, and
since the SCR-gate forward voltage is about 1V, there is
about 90mA of gate-drive current available: 2.08V
÷
23
=
0.09A. The highest upper-threshold voltage is 5.38V, so
available gate-drive current is about 190mA: 4.38V
÷
23
=
0.190A. The maximum forward gate current of the SCR is
200mA. The SCR trigger characteristics and the gate-drive
capability provide a workable solution for the power-supply
voltage range in question.
The 10k
resistor is the pull-up for the open-drain /HV output
of the MIC275x, and the 2200pF capacitor avoids inadvertent
premature triggering of the SCR, which might be caused by
a very narrow spike on the /HV line. Similarly, the 1k
resistor
from the SCR-gate to ground keeps the SCR-gate biased off.
The fuse shown in the diagrams, which ultimately protects
both the system components and the crowbar SCR, should
be a fast-blow type. The SCR is rated at 4A(rms), but it can
withstand a brief 25A surge. The crowbar circuit shown
should, conservatively, be capable of blowing a 5A or 6A
fuse.
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| MIC2755BMM | 功能描述:IC SUPERVISOR BATT SYSTEM 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復(fù)位:低有效 復(fù)位超時(shí):標(biāo)準(zhǔn)傳輸延遲為 60 µs 電壓 - 閥值:3V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:Digi-Reel® 其它名稱:LM8364BALMF30DKR |
| MIC2755BMM TR | 功能描述:IC SUPERVISOR BATT SYSTEM 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復(fù)位:低有效 復(fù)位超時(shí):標(biāo)準(zhǔn)傳輸延遲為 60 µs 電壓 - 閥值:3V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:Digi-Reel® 其它名稱:LM8364BALMF30DKR |
| MIC2755BMMTS | 制造商:MICREL SEMI 功能描述: |
| MIC2755YMM | 功能描述:監(jiān)控電路 Battery system supervisor; MSOP-08 (Lead Free) RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MIC2755YMM TR | 功能描述:監(jiān)控電路 Battery system supervisor; MSOP-08 (Lead Free) RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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