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參數(shù)資料
| 型號(hào)： | MAX6399ATA-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High-Voltage, Overvoltage/Undervoltage, Protection Switch Controller |
| 中文描述： | SWITCHING CONTROLLER, DSO8 |
| 封裝： | 3 X 3 MM, 0.80 MM HIEGHT, MO229/WEED-3, TDFN-8 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 649K |
| 代理商： | MAX6399ATA-T |
M
Reverse Voltage Protection
Use a diode or p-channel MOSFET to protect the
MAX6399 during a reverse voltage insertion (Figures 8a,
8b). Low p-channel MOSFET on-resistance of 30m
or
less yields a forward-voltage drop of only a few millivolts
(versus hundreds of millivolts for a diode, Figure 8a)
thus improving efficiency in battery-operated devices.
Connecting a positive battery voltage to the drain of Q1
(Figure 8b) produces forward bias in its body diode,
which clamps the source voltage one diode drop below
the drain voltage. When the source voltage exceeds
Q1’s threshold voltage, Q1 turns on. Once the FET is
on, the battery is fully connected to the system and can
deliver power to the device and the load.
An incorrectly inserted battery reverse-biases the FET’s
body diode. The gate remains at the ground potential.
The FET remains off and disconnects the reversed bat-
tery from the system. The zener diode and resistor com-
bination prevent damage to the p-channel MOSFET
during an overvoltage condition.
Thermal Shutdown
The MAX6399 thermal-shutdown feature monitors the
PC board temperature of the external MOSFET when
the devices sit on the same thermal island. Good ther-
mal contact between the MAX6399 and the external
n-channel MOSFET is essential for the thermal-shut-
down feature to effectively operate. Place the n-channel
MOSFET as close as possible to OUT.
When the MAX6399 junction temperature exceeds T
J
=
+150°C, the thermal sensor signals the shutdown logic,
turning off the GATE output, allowing the device to cool.
The thermal sensor turns GATE on after the IC’s junc-
tion temperature cools by 20°C. For continuous opera-
tion, do not exceed the absolute maximum junction-
temperature rating of T
J
= +160°C.
High-Voltage, Overvoltage/Undervoltage,
Protection Switch Controller
8
_______________________________________________________________________________________
MAX6399
IN
GND
GATE
OUT
V
IN
IN
OUT
DC-DC
CONVERTER
GND
C
GATE
C
LOAD
LOAD
Figure 5. The MAX6399 Controlling GATE Inrush Current
MAX6399
GATE
IN
OUT
GND
SET
IN
TO DC-DC
CONTROLLER
INPUT
Figure 6. Input Overvoltage Protection Configuration
MAX6399
IN
OUT
GATE
GND
1k
LOAD
60V
TVS
V
BATT
Figure 7. Protecting the MAX6399 Input from High-Voltage
Transients
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