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TPS2513DBVR Datasheet(PDF) 9 Page - Texas Instruments |
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TPS2513DBVR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 20 page TPS2513, TPS2513A TPS2514, TPS2514A www.ti.com SLVSBY8B – MAY 2013 – REVISED SEPTEMBER 2013 DETAILED DESCRIPTION OVERVIEW The following overview references various industry standards. It is always recommended to consult the latest standard to ensure the most recent and accurate information. Rechargeable portable equipment requires an external power source to charge its batteries. USB ports are convenient locations for charging because of an available 5-V power source. Universally accepted standards are required to ensure host and client-side devices meet the power management requirements. 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 the power allotment from the host to guarantee the total current draw does not exceed 500 mA. In general, each USB device can subsequently request more current, which is granted in steps of 100 mA up 500 mA total. The host may grant or deny the request based on the available current. Additionally, the success of the USB technology makes the micro-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 the USB 2.0 Specification or 900 mA defined in the USB 3.0 Specification, has become insufficient for many handsets, tablets and personal media players (PMP) which have a higher rated charging current. Wall adapters and car chargers can provide much more current than 500 mA or 900 mA to fast charge portable devices. 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 (defined in the USB 2.0 Specification) or 900 mA (defined in the USB 3.0 Specification) minimum while using a single micro-USB input connector. The devices support four of the most common protocols: • USB Battery Charging Specification, Revision 1.2 (BC1.2) • Chinese Telecommunications Industry Standard YD/T 1591-2009 • Divider mode • 1.2 V on both D+ and D– lines YD/T 1591-2009 is a subset of the BC1.2 specification supported by the vast majority of devices that implement USB charging. Divider and 1.2-V charging schemes are supported in devices from specific yet popular device makers. BC1.2 has three different port types, listed as follows. • Standard downstream port (SDP) • Charging downstream port (CDP) • Dedicated charging port (DCP) The BC1.2 Specification defines a charging port as a downstream facing USB port that provides power for charging portable equipment. Table 4 shows different port operating modes according to the BC1.2 Specification. Table 4. Operating Modes Table SUPPORTS USB2.0 MAXIMUM ALLOWABLE CURRENT PORT TYPE COMMUNICATION DRAWN BY PORTABLE EQUIPMENT (A) SDP (USB 2.0) Yes 0.5 SDP (USB 3.0) Yes 0.9 CDP Yes 1.5 DCP No 1.5 Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS2513 TPS2513A TPS2514 TPS2514A |
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