參數(shù)資料
型號(hào)： TPS2053DG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝： GREEN, PLASTIC, SOIC-16
文件頁(yè)數(shù)： 10/28頁(yè)
文件大?。?/td> 601K
代理商： TPS2053DG4
TPS2043, TPS2053
TRIPLE POWER-DISTRIBUTION SWITCHES
SLVS191 – JANUARY 1999
18
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
thermal protection
Thermal protection prevents damage to the IC when heavy-overload or short-circuit faults are present for
extended periods of time. The faults force the TPS2043 and TPS2053 into constant current mode, which causes
the voltage across the high-side switch to increase; under short-circuit conditions, the voltage across the switch
is equal to the input voltage. The increased dissipation causes the junction temperature to rise to high levels.
The protection circuit senses the junction temperature of the switch and shuts it off. Hysteresis is built into the
thermal sense circuit, and after the device has cooled approximately 20 degrees, the switch turns back on. The
switch continues to cycle in this manner until the load fault or input power is removed.
The TPS2043 and TPS2053 implement a dual thermal trip to allow fully independent operation of the power
distribution switches. In an overcurrent or short-circuit condition the junction temperature will rise. Once the die
temperature rises to approximately 140
°C, the internal thermal sense circuitry checks which power switch is
in an overcurrent condition and turns that power switch off, thus isolating the fault without interrupting operation
of the adjacent power switch. Should the die temperature exceed the first thermal trip point of 140
°C and reach
160
°C, both switches turn off. The OC open-drain output is asserted (active low) when overtemperature or
overcurrent occurs.
undervoltage lockout (UVLO)
An undervoltage lockout ensures that the power switch is in the off state at power up. Whenever the input voltage
falls below approximately 2 V, the power switch will be quickly turned off. This facilitates the design of
hot-insertion systems where it is not possible to turn off the power switch before input power is removed. The
UVLO will also keep the switch from being turned on until the power supply has reached at least 2 V, even if
the switch is enabled. Upon reinsertion, the power switch will be turned on with a controlled rise time to reduce
EMI and voltage overshoots.
universal serial bus (USB) applications
The universal serial bus (USB) interface is a 12-Mb/s, or 1.5-Mb/s, multiplexed serial bus designed for
low-to-medium bandwidth PC peripherals (e.g., keyboards, printers, scanners, and mice). The four-wire USB
interface is conceived for dynamic attach-detach (hot plug-unplug) of peripherals. Two lines are provided for
differential data, and two lines are provided for 5-V power distribution.
USB data is a 3.3-V level signal, but power is distributed at 5 V to allow for voltage drops in cases where power
is distributed through more than one hub across long cables. Each function must provide its own regulated 3.3 V
from the 5-V input or its own internal power supply.
The USB specification defines the following five classes of devices, each differentiated by power-consumption
requirements:
D Hosts/self-powered hubs (SPH)
D Bus-powered hubs (BPH)
D Low-power, bus-powered functions
D High-power, bus-powered functions
D Self-powered functions
Self-powered and bus-powered hubs distribute data and power to downstream functions. The TPS2043 and
TPS2053 can provide power-distribution solutions for many of these classes of devices.
相關(guān)PDF資料
PDF描述
TPS2047BD 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
TPS2047BDRG4 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
TPS2046BDG4 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
TPS2051BDBV 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5
TPS2051BQDRQ1 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS2053DR 功能描述:電源開(kāi)關(guān) IC - USB Triple 2in 3 out .7A RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube
TPS2053DRG4 功能描述:電源開(kāi)關(guān) IC - USB DUAL HI-SIDE MOSFET RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube
TPS2054 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:QUAD POWER-DISTRIBUTION SWITCHES
TPS2054A 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:0.7A. 2.7-5.5V Quad (2 In/4 Out) Hi-Side MOSFET. Fault Report. Act-High Enable
TPS2054AD 功能描述:電源開(kāi)關(guān) IC - USB Qd .345A 2.7-5.5V Hi RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube
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