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參數資料
| 型號： | TPS2541RTET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | GREEN, PLASTIC, WQFN-16 |
| 文件頁數： | 16/37頁 |
| 文件大小： | 999K |
| 代理商： | TPS2541RTET |
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SLVSAG2A
– OCTOBER 2010 – REVISED APRIL 2011
GENERAL INFORMATION
Overview
The following overview references various industry standards. It is always recommended to consult the most
up-to-date standard to ensure the most recent and accurate information.
Rechargeable portable equipment requires an external power source to charge its batteries. USB ports are a
convenient location for charging because of an available 5-V power source. Universally accepted standards are
required to make sure host and client-side devices operate together in a system to ensure power management
requirements are met. Traditionally, USB host ports following the USB 2.0 specification must provide at least 500
mA to downstream client-side devices. Because multiple USB devices can be attached to a single USB port
through a bus-powered hub, it is the responsibility of the client-side device to negotiate its power allotment from
the host to ensure the total current draw does not exceed 500 mA. In general, each USB device is granted 100
mA and may request more current in 100 mA unit steps up to 500 mA. The host may grant or deny based on the
available current.
Additionally, the success of USB has made the mini-USB connector a popular choice for wall adapter cables.
This allows a portable device to charge from both a wall adapter and USB port with only one connector.
One common difficulty has resulted from this. As USB charging has gained popularity, the 500 mA minimum
defined by USB 2.0 has become insufficient for many handset and personal media players which need a higher
charging rate. On the other hand, wall adapters can provide much more current than 500 mA. Several new
standards have been introduced defining protocol handshaking methods that allow host and client devices to
acknowledge and draw additional current beyond the 500 mA minimum defined by USB 2.0 while still using a
single micro-USB input connector.
The TPS2540, TPS2540A and TPS2541 support three of the most common protocols:
USB 2.0 Battery Charging Specification BC1.2
Chinese Telecommunications Industry Standard YD/T 1591-2009
Divider Mode
All three methods have similarities and differences, but the biggest commonality is that all three define three
types of charging ports that provide charging current to client-side devices. These charging ports are defined as:
Standard Downstream Port (USB 2.0) (SDP)
Charging Downstream Port (CDP)
Dedicated Charging Port (DCP)
BC1.2 defines a Charging Port as a downstream facing USB port that provides power for charging portable
equipment.
The table below shows the differences between these ports according to BC1.2 .
Table 1. Operating Modes
MAXIMUM ALLOWABLE CURRENT DRAW
PORT TYPE
SUPPORTS USB 2.0 COMMUNICATION
BY PORTABLE EQUIPMENT (A)
SDP (USB 2.0)
Yes
0.5
CDP
Yes
1.5
DCP
No
1.5
BC1.2 defines the protocol necessary to allow portable equipment to determine what type of port it is connected
to so that it can allot its maximum allowable current draw. The hand-shaking process has two steps. During step
one, the primary detection, the portable equipment outputs a nominal 0.6-V output on its D+ line and reads the
voltage input on its D- line. The portable device concludes it is connected to an SDP if the voltage is less than
the nominal data detect voltage of 0.3 V. The portable device concludes that it is connected to a Charging Port if
the D- voltage is greater than the nominal data detect voltage of 0.3 V and less than 0.8 V. The second step, the
secondary detection, is necessary for portable equipment to determine between a CDP and a DCP. The portable
device outputs a nominal 0.6 V output on its D- line and reads the voltage input on its D+ line. The portable
device concludes it is connected to a CDP if the data line being read remains less than the nominal data detect
voltage of 0.3 V. The portable device concludes it is connected to a DCP if the data line being read is greater
than the nominal data detect voltage of 0.3V and less than 0.8 V.
Copyright
2010–2011, Texas Instruments Incorporated
23
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| TPS2543EVM-064 | 功能描述:電源管理IC開發工具 TPS2543 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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| TPS2543RTER | 功能描述:電源開關 IC - USB USB Charging Port Pwr Sw & Cntrlr 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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