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參數(shù)資料
| 型號(hào)： | MIC2755BMM |
| 廠商： | MICREL INC |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Battery System Supervisor Preliminary Information |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 79K |
| 代理商： | MIC2755BMM |
February 2000
7
MIC2755
MIC2755
Micrel
V
= 3.1V =1.24V
1M
R10
BAT(low)
R10 = 400k
1M
= R10+R11
V
= 2.9V =1.24V
1M
R9+400k
BAT(dead)
R9 = 27k
R8 = 1M
–
R9
–
R10 = 573k
The accuracy of the resistors can be chosen based upon the
accuracy required by the system.
Input Transients
The MIC2755 is inherently immune to very short negative-
going
“
glitches.
”
Very brief transients may cross the V
BAT(lo)
or V
BAT(dead)
thresholds without tripping the output(s).
As shown in Figures 3 and 4, the narrower the transient, the
deeper the threshold overdrive that will be ignored by the
MIC2755. The graph represents the typical allowable tran-
sient duration for a given amount of threshold overdrive that
will not cause the corresponding output to change state.
Alternate Configurations
The MIC2755 can be used in a variety of ways. It is especially
flexible due to the fact that the NMI comparator is completely
independent. There are other useful configuration besides a
three-state battery monitor. The NMI comparator can be used
to provide power-fail indication (PFI/PFI), monitor an auxiliary
battery (LBI/LBO), or detect the presence of an ac adapter.
Voltage Supervisor and Backup Battery Monitor
Figure 5 illustrates the MIC2755 being used as a voltage
supervisor and a battery monitor in a 3.3V system with a
Lithium coin-cell backup. The primary voltage monitor is
configured as a voltage supervisor with a nominal trip point of
3.034V and 33mV of hysteresis as set by R1, R2, and R3. The
NMI comparator is used to detect a low-battery condition so
the system is aware that the backup battery is discharged. In
this example, the /NMI output will be asserted if battery
voltage falls below 2.2V. Manual reset capability can be
added as discussed in the Manual Resetand Configuration
With Manual Reset sections.
This same configuration can be used to detect the presence
of an auxiliary power source such as an ac adapter instead of
monitoring a battery. R4 and R5 would be selected such that
the /NMI output is deasserted when the proper input voltage
is applied.
Voltage Supervisor with Power Fail Warning
Figure 6 illustrates the MIC2755 being used as a voltage
supervisor and a power-fail detector in a 3.3V system. The
primary voltage monitor is configured as a voltage supervisor
0
20
40
60
80
100
120
140
160
180
200
0
5
10
15
20
25
30
M
μ
s
RESET COMP. OVERDRIVE, V
REF
–
V
PTH
(mV)
Input Transient
Response (V
POF
)
Figure 3. Input Transient Response
0
20
40
60
80
100
120
0
5 10 15 20 25 30 35 40 45
RESET COMP. OVERDRIVE, V
REF
–
V
NTH
(mV)
M
μ
s
Input Transient
Response (V
NMI
)
Figure 4. Input Transient Response
with a nominal trip point of 3.034V and 33mV of hysteresis as
set by R1, R2, and R3. The NMI comparator is used to detect
an impending power failure such as a low-battery condition or
ac power outage. The /NMI output will be asserted if the input
voltage to the LDO regulator falls below 3.55V. (The MIC5245
has a specified maximum dropout of 250mV at 150mA output
current. If the input voltage falls below 3.55V, the output may
droop.)
By monitoring the input of the LDO regulator, the system
receives the earliest warning of an impending power loss.
Manual reset capability can be added as discussed in the
Manual Resetand Configuration With Manual Reset sec-
tions.
Supervised Boost Converter and Microcontroller or
Microprocessor
In Figures 7 and 8, the MIC2755 is used to monitor the battery
and the MIC3172 is used to maintain the output voltage at
3.3V by boosting the input voltage. When the Li-ion battery
voltage drops to 3.1V, the MIC2755 alerts the microcontroller
or the microprocessor. When the battery voltage drops to
2.9V, the MIC2755 turns off the MIC3172.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2755BMM TR | 功能描述:IC SUPERVISOR BATT SYSTEM 8-MSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)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(lèi)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(chēng):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(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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 |
| MIC27600YJL TR | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 36VIN/7A DC-DC Buck Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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