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參數資料
| 型號： | 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： | 15/15頁 |
| 文件大?。?/td> | 168K |
| 代理商： | MAX6457UKD0C+T |
Hysteresis
Hysteresis adds noise immunity to the voltage monitors
and prevents oscillation due to repeated triggering
when VIN is near the threshold trip voltage. The hystere-
sis in a comparator creates two trip points: one for the
rising input voltage (VTH+) and one for the falling input
voltage (VTH-). These thresholds are shown in Figure 6.
The internal hysteresis options of the MAX6457/
MAX6458/MAX6459 are designed to eliminate the need
for adding an external hysteresis circuit.
Timeout Period
The timeout period (tTP) for the MAX6457 is the time
from when the input (IN+) crosses the rising input
threshold (VTH+) to when the output goes high (see
Figures 6 and 7). For the MAX6458, the monitored volt-
age must be in the “window” before the timeout starts.
The MAX6459 and MAX6460 do not offer the extended
timeout option (150ms). The extended timeout period is
suitable for overvoltage protection applications requir-
ing transient immunity to avoid false output assertion
due to noise spikes.
Latched-Output Operation
The MAX6457 features a digital latch input (CLEAR) to
latch any overvoltage event. If the voltage on IN+ (VIN+)
is below the internal threshold (VTH-), or if VCC is below
4V, OUT remains low regardless of the state of CLEAR.
Drive CLEAR high to latch OUT high when VIN+ exceeds
VTH+. When CLEAR is high, OUT does not deassert if
VIN+ drops back below VIN-. Toggle CLEAR to deassert
OUT. Drive CLEAR low to make the latch transparent
(Figure 7). CLEAR must be low when powering up the
MAX6457. To initiate self-clear at power-up, add a 100k
pullup resistor from CLEAR to VCC and a 1F capacitor
from CLEAR to GND to hold CLEAR low. Connect
CLEAR to GND when not used. See Figure 9.
MAX6457–MAX6460
High-Voltage, Low-Current Voltage Monitors in
SOT Packages
_______________________________________________________________________________________
9
IN+
OUT
>VTH+
<VTH-
VCC
0
tTP
CLEAR
Figure 7. Timing Diagram (MAX6457)
5-CELL
Li+
BATTERY
STACK
BATTERY
CHARGER
DC-DC
CONVERTER
LOAD
R1
R2
RPULLUP
IN
OUT
+21V
VCC
GND
IN+
OUT
(OUTA FOR
MAX6459)
MAX6457–
MAX6460
SHDN
Figure 8. Undervoltage Lockout Typical Application Circuit
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| MAX6457UKD3C+T | High-Voltage, Low-Current Voltage Monitors in SOT Packages |
| MAX6458UKD0A+T | High-Voltage, Low-Current Voltage Monitors in SOT Packages |
| MAX6458UKD0B+T | High-Voltage, Low-Current Voltage Monitors in SOT Packages |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（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)測電壓數: 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（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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