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參數(shù)資料
| 型號： | MAX6399 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Voltage, Overvoltage/Undervoltage, Protection Switch Controller |
| 中文描述： | 高壓、過壓/欠壓保護開關(guān)控制器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 649K |
| 代理商： | MAX6399 |
M
The MAX6399 includes internal thermal-shutdown pro-
tection, disabling the external MOSFET if the device
reaches overtemperature conditions.
Shutdown Control
The MAX6399 active-low
SHDN
input turns off the exter-
nal MOSFET, disconnecting the load and reducing
power consumption. After power is applied and
SHDN
is driven above its logic-high voltage, there is a 100μs
delay before GATE begins to enhance.
SHDN
is also uti-
lized to unlatch GATE after an overvoltage condition has
been removed.
GATE Voltage
The MAX6399 uses a high-efficiency charge pump to
generate the GATE voltage. Upon V
IN
exceeding the
5V (typ) UVLO threshold, GATE enhances 10V above
IN (for V
IN
≥
14V) with a 100μA pullup current. An over-
voltage condition occurs when the voltage at SET pulls
above its 0.5V threshold. When the overvoltage fault
occurs (SET = 0.5V), GATE latches off, which discon-
nects the load from the power source (see Figure 2).
After the overvoltage fault has disappeared, the fault
can be unlatched by toggling
SHDN
or recycling the
MAX6399 input.
DC-DC Output Overvoltage Protection
The MAX6399 overvoltage protection features a fast com-
parator that disconnects the load from the main power
line when an overvoltage condition occurs at the output of
a DC-DC converter. When an overvoltage condition is
sensed, the MAX6399 latches GATE off, disconnecting
the power source from the DC-DC input. To unlatch
GATE after an overvoltage fault has disappeared, recycle
IN or toggle
SHDN
.
Setting Output Overvoltage Threshold (SET)
SET provides an accurate means of monitoring a sys-
tem voltage for an overvoltage fault. Use a resistor-
divider network to set the desired overvoltage condition
(Figure 2). SET has a rising 0.5V threshold.
Begin by selecting the total end-to-end resistance,
R
TOTAL
= R1 + R2. Choose R
TOTAL
to yield a total cur-
rent equivalent to a minimum 100 x I
SET
(SET’s input
bias current) at the desired overvoltage threshold.
For example, with an overvoltage threshold set to 1.8V:
R
TOTAL
< 1.8V/(100 x I
SET
), where I
SET
is SET’s 50nA
input bias current.
R
TOTAL
< 360k
Use the following formula to calculate R2:
where V
TH
is the 0.5V SET rising threshold and V
OV
is the
overvoltage condition at the output of a DC-DC converter,
R2 = 100k
, R
TOTAL
= R2 + R1, where R1 = 260k
.
Use a 261k
standard resistor.
Using a lower value for total resistance dissipates more
power but provides slightly better accuracy.
R
V
R
V
TH
TOTAL
OV
2
×
=
High-Voltage, Overvoltage/Undervoltage,
Protection Switch Controller
6
_______________________________________________________________________________________
400ns/div
V
DC_DC
500mV/div
V
GATE
10V/div
V
OUT
10V/div
4V
3V
V
OV
= 4V
V
IN
= 14V
Figure 2. GATE Timing Diagram
MAX6399
GATE
IN
SET
OUT
GND
R1
R2
V
IN
IN
OUT
DC-DC
CONVERTER
GND
V
OUT
= 1.8V
Figure 3. Output Overvoltage Protection Configuration
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| MAX6399ATA-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 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(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 |
| MAX639C/D | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V/3.3V/3V Adjustable High-Efficiency Low-IQ Step-Down DC-DC Converters RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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