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參數(shù)資料
| 型號(hào)： | MAX6457UKD0C+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | High-Voltage, Low-Current Voltage Monitors in SOT Packages |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | ROHS COMPLIANT, MO-178AA, SOT-23, 5 PIN |
| 文件頁數(shù)： | 2/15頁 |
| 文件大?。?/td> | 168K |
| 代理商： | MAX6457UKD0C+T |
MAX6457–MAX6460
Applications Information
Undervoltage Lockout
Figure 8 shows the typical application circuit for detecting
an undervoltage event of a 5-cell Li+ battery stack.
Connect OUT of the MAX6457/MAX6458/MAX6460
(OUTA of the MAX6459) to the shutdown input of the DC-
DC converter to cut off power to the load in case of an
undervoltage event. Select R1 and R2 to set the trip volt-
age (see the
Programming the Trip Voltage (VTRIP) sec-
tion). When the voltage of the battery stack decreases so
that VIN+ drops below VTH- of the MAX6457–MAX6460,
then OUT (OUTA) goes low and disables the power sup-
ply to the load. When the battery charger restores the volt-
age of the 5-cell stack so that VIN+ > VTH+, OUT (OUTA)
goes high and the power supply resumes driving the load.
Overvoltage Shutdown
The MAX6457–MAX6460 are ideal for overvoltage shut-
down applications. Figure 9 shows a typical circuit for
this application using a pass P-channel MOSFET. The
MAX6457–MAX6460 are powered directly from the sys-
tem voltage supply. Select R1 and R2 to set the trip volt-
age (see the
Programming the Trip Voltage (VTRIP)
section). When the supply voltage remains below the
selected threshold, a low logic level on OUT (OUTB for
MAX6459) turns on the p-channel MOSFET. In the case
of an overvoltage event, OUT (OUTB) asserts high, turns
off the MOSFET, and shuts down the power to the load.
Figure 10 shows a similar application using a fuse and
a silicon-controlled rectifier (SCR). An overvoltage
event turns on the SCR and shorts the supply to
ground. The surge of current through the short circuit
blows the fuse and terminates the current to the load.
Select R3 so that the gate of the SCR is properly biased
when OUT (OUTB) goes high impedance.
Window Detection
The MAX6458/MAX6459 include undervoltage and
overvoltage comparators for window detection (Figures
2 and 3). The circuit in Figure 11 shows the typical con-
figuration for this application. For the MAX6458, OUT
asserts high when VCC is within the selected “window.”
When VCC falls below the lower limit of the window
(VTRIPLOW) or exceeds the upper limit (VTRIPHIGH),
OUT asserts low.
The MAX6459 features two independent open-drain
outputs: OUTA (for undervoltage events) and OUTB (for
overvoltage events). When VCC is within the selected
window, OUTA and OUTB assert high. When VCC falls
below VTRIPLOW, OUTA asserts low while OUTB
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
10
______________________________________________________________________________________
LOAD
R1
100k
1
F
R2
RPULLUP
VCC
GND
IN+
OUT
(OUTA FOR
MAX6459)
MAX6457–
MAX6460
VSUPPLY
CLEAR
Figure 9. Overvoltage Shutdown Circuit (with External Pass
MOSFET)
LOAD
R1
R3
R2
VCC
FUSE
GND
IN+
OUT
(OUTA FOR
MAX6459)
MAX6457–
MAX6460
VSUPPLY
SCR
Figure 10. Overvoltage Shutdown Circuit (with SCR Fuse)
VCC
GND
VCC
R1
R2
R3
MAX6458
MAX6459
IN+
IN-
OUT
MAX6458
ONLY
OUTB
MAX6459
ONLY
RPULLUP
OUTA
OUTB
Figure 11. Window Detection
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| MAX6457UKD3B+T | High-Voltage, Low-Current Voltage Monitors in SOT Packages |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6457UKD3A | 制造商:Maxim Integrated Products 功能描述:HIGH-VOLTAGE LOW-CURRENT VOLTAGE M - Cut Tape Product |
| MAX6457UKD3A+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 5PIN SOT-23 - Rail/Tube |
| MAX6457UKD3A+T | 功能描述:監(jiān)控電路 Single Low C/V Voltage Monitor 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 |
| MAX6457UKD3A-T | 功能描述:監(jiān)控電路 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 |
| MAX6457UKD3B | 制造商:Maxim Integrated Products 功能描述:HIGH-VOLTAGE LOW-CURRENT VOLTAGE M - Cut Tape Product |
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