- 您现在的位置：买卖IC网 > PDF目录383342 > MAX1940 (Maxim Integrated Products, Inc.) Triple USB Switch with Autoreset and Fault Blanking PDF资料下载
参数资料
| 型号： | MAX1940 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Triple USB Switch with Autoreset and Fault Blanking |
| 中文描述： | 三路USB开关，带有自动复位和故障屏蔽 |
| 文件页数： | 11/12页 |
| 文件大小： | 326K |
| 代理商： | MAX1940 |
power bus with short traces. Wide power bus planes at
IN_ and OUT provide superior heat dissipation as well.
An active switch dissipates little power with minimal
change in package temperature. Calculate the power
dissipation for this condition as follows:
P = (I
OUT_
)
2
x R
ON
At the normal operating current (I
OUT_
= 0.5A) and the
maximum on-resistance of the switch (135m
), the
power dissipation is:
P = (0.5A)
2
x 0.135
= 34mW per switch.
The worst-case power dissipation occurs when the output
current is just below the current-limit threshold (1.2A max)
with an output voltage greater than 1V. In this case, the
power dissipated in each switch is the voltage drop
across the switch multiplied by the current limit:
P = I
LIM
x (V
IN
- V
OUT
)
For a 5V input and 1V output, the maximum power dis-
sipation per switch is:
P = 1.2A x (5V - 1V) = 4.8W
Because the package power dissipation is 667mW, the
MAX1940 die temperature exceeds the +160
°
C thermal
shutdown threshold, and the switch output shuts down
until the junction temperature cools by +15
°
C. The duty
cycle and period are strong functions of the ambient
temperature and the PC board layout (see the
Thermal
Shutdown
section).
If the output current exceeds the current-limit threshold,
or the output voltage is pulled below the short-circuit
detect threshold, the MAX1940 enters a fault state after
20ms, at which point autoreset mode is enabled and
25mA is sourced by the output. For a 5V input, OUT_
short-circuited to GND, and autoreset mode active, the
power dissipation is as follows:
P = 0.025A x 5V = 0.125W
Chip Information
TRANSISTOR COUNT: 4259
PROCESS: BiCMOS
M
Triple USB Switch with Autoreset and
Fault Blanking
______________________________________________________________________________________
11
ON
OFF
IN1
IN2
IN3
IN4
IN5
ONA
ONB
ONC
SEL
FAULTA
FAULTB
FAULTC
OUTA
OUTB
OUTC
GND
MAX1940
INPUT
4V TO 5.5V
USB
PORT A
USB
PORT B
USB
PORT C
O.1
μ
F
100k
100k
100k
1
μ
F*
1
μ
F*
1
μ
F*
*USB APPLICATIONS MAY REQUIRE
ADDITIONAL BULK CAPACITANCE
Figure 2. Typical Application Circuit
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1940EEE | Triple USB Switch with Autoreset and Fault Blanking |
| MAX194ACPE | 14-Bit, 85ksps ADC with 10A Shutdown |
| MAX194AEWE | Circular Connector; No. of Contacts:22; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:13; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:13-35 RoHS Compliant: No |
| MAX194BCWE | 14-Bit, 85ksps ADC with 10A Shutdown |
| MAX194BCPE | 14-Bit, 85ksps ADC with 10A Shutdown |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1940EEE | 功能描述:电源开关 IC - USB Triple USB Switch w/Autoreset RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1940EEE+ | 功能描述:电源开关 IC - USB Triple USB Switch w/Autoreset RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1940EEE+T | 功能描述:电源开关 IC - USB Triple USB Switch w/Autoreset RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1940EEE-T | 功能描述:电源开关 IC - USB Triple USB Switch w/Autoreset RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1945EVKIT | 制造商:Maxim Integrated Products 功能描述:1MHZ, 1% ACCURATE, 6A INTERNAL SWITCH STEP-DO - Bulk |
发布紧急采购，3分钟左右您将得到回复。