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参数资料
| 型号： | MAX1693-MAX1694 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | USB Current-Limited Switches with Fault Blanking |
| 中文描述： | 的USB限流开关的故障消隐 |
| 文件页数： | 6/8页 |
| 文件大小： | 143K |
| 代理商： | MAX1693-MAX1694 |
_______________Detailed Description
The MAX1693/MAX1694 P-channel MOSFET power
switches limit output current to 0.7A min to 1.0A max.
When the output current is increased beyond the cur-
rent limit (I
LIMIT
), the current also increases through the
replica switch (I
OUT
/6500). The current-limit error ampli-
fier compares the voltage to the internal 1.24V refer-
ence and regulates the current back to the I
LIMIT
.
These switches are not bidirectional; therefore, the
input voltage must be higher than the output voltage.
Continuous Short-Circuit Protection
The MAX1693/MAX1694 are foldback short circuit-pro-
tected switches. In the event of an output short-circuit
or current-overload condition, the current through the
switch is foldback-current limited to 500mA continuous
for the MAX1693. For the MAX1694, if the short circuit
lasts longer than 10ms, the switch is latched off.
Thermal Shutdown
The MAX1693/MAX1694 feature thermal shutdown. The
switch turns off and the
FAULT
output goes low imme-
diately (no fault blanking) when the junction tempera-
ture exceeds +165°C. The MAX1694 remains latched
with the switch off and the
FAULT
output low. When the
MAX1693 cools 20°C, the switch turns back on. If the
fault short-circuit condition is not removed, the switch
will cycle on and off, resulting in a pulsed output.
FAULT
Indicator
The MAX1693/MAX1694 provide a fault output
(
FAULT
). A 100k
pull-up resistor from
FAULT
to IN
provides a logic control signal. This open-drain output
goes low when any of the following conditions occur:
The input voltage is below the undervoltage-lockout
(UVLO) threshold.
The die temperature exceeds the thermal shutdown
temperature limit of +165°C.
The device is in current limit and the 10ms fault-
blanking period is exceeded.
Fault Blanking
The MAX1693/MAX1694 feature 10ms fault blanking.
Fault blanking allows current-limit faults, including
M
USB Current-Limited Switches
with Fault Blanking
6
_______________________________________________________________________________________
Pin Description
NAME
FUNCTION
1, 3, 9
IN
Input. P-channel MOSFET source. Connect all IN pins together and bypass with a 1μF
ceramic capacitor to ground.
Switch Output. P-channel MOSFET drain. Connect all OUT pins together and bypass with a
0.1μF capacitor to ground.
PIN
2, 4, 8, 10
OUT
5
ON
GND
Active-Low Switch On Input. A logic low turns the switch on.
6
Ground
Fault-Indicator Output. This open-drain output goes low when the device is in thermal shut-
down or undervoltage lockout or on a sustained (>10ms) current-limit condition. For the
MAX1694 only, this output latches low when asserted, and the power switch is turned off
until the latch is reset.
7
FAULT
MAX1693
P
P
P
OUT
GND
1.24V
N
FAULT
ON
ON
CURRENT-LIMIT
AMPLIFIER
REPLICA
AMPLIFIER
ON
HOT
IN
CONTROL
CIRCUITRY
10ms
TIMER
Figure 1. MAX1693 Functional Diagram
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