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| 型号： | TPS2051DR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封装： | GREEN, PLASTIC, SOIC-8 |
| 文件页数： | 10/25页 |
| 文件大小： | 566K |
| 代理商： | TPS2051DR |
TPS2041, TPS2051
POWER-DISTRIBUTION SWITCHES
SLVS172A –AUGUST 1998 – REVISED APRIL 1999
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
low-power bus-powered functions and high-power bus-powered functions
Both low-power and high-power bus-powered functions obtain all power from upstream ports; low-power
functions always draw less than 100 mA; high-power functions must draw less than 100 mA at powerup and
can draw up to 500 mA after enumeration. If the load of the function is more than the parallel combination of
44
and 10 F at powerup, the device must implement inrush current limiting (see Figure 32).
IN
OC
EN
GND
0.1
F
2,3
5
4
6, 7, 8
0.1
F
10
F
GND
1
OUT
TPS2041
Power Supply
D+
D–
VBUS
USB
Control
3.3 V
10
F
Internal
Function
Figure 32. High-Power Bus-Powered Function
USB power-distribution requirements
USB can be implemented in several ways, and, regardless of the type of USB device being developed, several
powe- distribution features must be implemented.
D Hosts/self-powered hubs must:
–
Current-limit downstream ports
–
Report overcurrent conditions on USB VBUS
D Bus-powered hubs must:
–
Enable/disable power to downstream ports
–
Power up at <100 mA
–
Limit inrush current (<44
and 10 F)
D Functions must:
–
Limit inrush currents
–
Power up at <100 mA
The feature set of the TPS2041 and TPS2051 allows them to meet each of these requirements. The integrated
current-limiting and overcurrent reporting is required by hosts and self-powered hubs. The logic-level enable
and controlled rise times meet the need of both input and output ports on bus-power hubs, as well as the input
ports for bus-power functions (see Figure 33).
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| TPS2051DRG4 | 功能描述:电源开关 IC - USB DUAL HI-SIDE MOSFET 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 |
| TPS2051P | 功能描述:电源开关 IC - USB 0.7A 2.7-5.5V Hi 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 |
| TPS2051PE4 | 功能描述:电源开关 IC - USB DUAL HI-SIDE MOSFET 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 |
| TPS2052 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL POWER-DISTRIBUTION SWITCHES |
| TPS2052A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:0.7A. 2.7-5.5V Dual (1In/ 2Out) Hi-Side MOSFET. Fault Report. Act-High Enable |
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