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參數(shù)資料
| 型號(hào)： | MIC2755BMM |
| 廠商： | MICREL INC |
| 元件分類： | 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)： | 6/12頁(yè) |
| 文件大?。?/td> | 79K |
| 代理商： | MIC2755BMM |
MIC2755
Applications Information
Outputs
Since the MIC2755 outputs are open-drain MOSFETs, most
applications will require pull-up resistors. The value of the
resistors should not be too large or leakage effects may
dominate.
Programming Thresholds
There are separate resistive-divider configurations for cir-
cuits that require or do not require manual reset capability.
Configuration Without Manual Reset
See Figure 1. The battery-OK threshold is calculated using:
Micrel
MIC2755
6
February 2000
V
V
R1 R2 R3 R4
R
BAT(OK)
REF
=
4
The low-battery threshold is calculated using:
V
V
R1 R2 R3 R4
R3 R4
BAT(low)
REF
=
The dead-battery threshold is calculated using:
V
V
R1 R2 R3 R4
R2 R3 R4
BAT(dead)
REF
=
where, for all equations:
V
REF
= 1.24V
In order to provide the additional criteria needed to solve for
the resistor values, the resistors can be selected such that
they have a given total value, that is, R1 + R2 + R3 + R4 =
R
total
. A value such as 1M
for R
total
is a reasonable value
because it draws minimum battery current per resistor ladder
but has no significant effect on system accuracy.
When working with large resistors, a small amount of leakage
current can cause voltage offsets that degrade system accu-
racy. The maximum recommended total resistance from
V
BAT
to ground is 3M
.
V
BAT
MIC2755
VDD
PTH
NTH
RTH(/MR)
/POF
/NMI
/RST
GND
POF
NMI
RST
R1
572k
R2
28k
R4
344k
R3
55.6k
100k 100k
100k
V
BAT
Figure 1. Example Circuit without Manual Reset
Once the desired trip points are determined, set the V
BAT(OK)
threshold first.
For a typical single-cell lithium ion battery, 3.6V is a reason-
able
“
OK threshold
”
because at 3.6V the battery is moder-
ately charged. Solving for R4:
V
3.6V
1.24V
1M
R
BAT(OK)
=
=
4
R4 = 344k
To determine the resistor values for V
BAT(low)
threshold, set
R4 = 344k
and solve for R3.
V
= 3.1V =1.24V
1M
R +R4
3
BAT(low)
R3 = 56k
Once R3 and R4 are determined, the equation for V
BAT(dead)
can be used to determine R2. A single lithium-ion cell should
not be discharged below 2.5V. Many applications limit the
drain to 2.9V. Using 2.9V for the V
BAT(dead)
threshold allows
calculating the following resistor values.
V
= 2.9V =1.24V
1M
R2+55.6k+344k
BAT(dead)
R2 = 27.4k
R1 = 1M
–
R2
–
R3
–
R4 = 572k
Configuration With Manual Reset
See Figure 2. To use manual reset, the MIC2755 requires a
separate resistor ladder for the switch and fresh-battery
threshold. The remaining two thresholds are set by the three-
resistor ladder.
MIC2755
VDD
PTH
NTH
RTH(/MR)
/POF
/NMI
/RST
GND
POF
NMI
RST
V
BAT
V
BAT
R6
656k
R7
344k
R8
573k
R9
26.7k
R10
400k
SW
100k 100k
100k
Figure 2. Example Circuit with Manual Reset
V
= V
R6 R7
R7
BAT(OK)
REF
V
= V
R8+R9+R10
R10
BAT(low)
REF
V
= V
R8+R9+R10
R9+R10
BAT(dead)
REF
where, for all equations:
V
REF
= 1.24V
Once the desired trip points are determined, set R6 + R7 =
1M
and solve for R7.
V
= 3.6V =1.24V
1M
R7
BAT(fresh)
R7 = 344k
R6 = 1M
–
344k = 656k
The remaining resistor values are solved in a similar manner
as the above.
1M
= R8 + R9 + R10
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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(guò)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(guò)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 |
| MIC27600YJL TR | 功能描述:直流/直流開關(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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