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参数资料
| 型号： | MAX1931EUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC SW CUR LIMIT USB 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | USB，外设 |
| 电流 - 电源： | 14µA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 带卷 (TR) |
Current-Limited Switch for Single USB Port
Pin Description
PIN
1, 3, 9
2, 4, 8, 10
5
6
7
NAME
IN
OUT
ON
GND
FAULT
FUNCTION
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.
Active-Low Switch On Input. A logic low turns the switch on.
Ground
Fault-Indicator Output. This open-drain output goes low when the device is in thermal shut-
down, undervoltage lockout, or on a sustained (>10ms) current-limit condition.
Continuous Short-Circuit Protection
IN
FAULT
P
P
MAX1931
OUT
The MAX1931 is a foldback short-circuit-protected
switch. In the event of an output short-circuit or current-
overload condition, the current through the switch is
foldback-current-limited to 500mA continuous.
Thermal Shutdown
N
REPLICA
AMPLIFIER
ON
P
The MAX1931 features thermal shutdown. The switch
turns off and the FAULT output goes low immediately
(no fault blanking) when the junction temperature
exceeds +165 ° C. When the MAX1931 cools 20 ° C, the
switch turns back on. If the fault short-circuit condition
is not removed, the switch cycles on and off, resulting
ON
10ms
TIMER
HOT
ON
CURRENT-LIMIT
AMPLIFIER
1.24V
GND
in a pulsed output.
FAULT Indicator
The MAX1931 provides a fault output ( FAULT ). A
100k ? pullup 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
CONTROL
CIRCUITRY
Figure 1. Functional Diagram
_______________Detailed Description
The MAX1931 P-channel MOSFET power switch limits
output current to 0.64A (min) to 1.06A (max). When the
output current is increased beyond the current limit
(I LIMIT ), the current also increases through the replica
switch (I OUT / 6500). The current-limit error amplifier
compares the voltage to the internal 1.24V reference
and regulates the current back to the I LIMIT .
This switch is not bidirectional; therefore, the input volt-
age must be higher than the output voltage.
(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 MAX1931 features 10ms fault blanking. Fault
blanking allows current-limit faults, including momen-
tary short-circuit faults that occur when hot-swapping a
capacitive load, and also ensures that no fault is issued
during power-up. When a load transient causes the
device to enter current limit, an internal counter starts. If
the load fault persists beyond the 10ms fault-blanking
timeout, the FAULT output asserts low. Ensure that the
MAX1931 ’ s input is adequately bypassed to prevent
input glitches from triggering spurious FAULT outputs.
Input voltage glitches less than 150mV do not cause a
6
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