1FEATURES
2• Meets Battery Charging Specification BC1.2
for DCP and CDP
• Meets Chinese Telecommunications Industry
Standard YD/T 1591-2009
• Supports Sleep-Mode Charging for Most
Available Apple® Devices and/or BC1.2
Compliant Devices
• Compatible With USB 2.0 and 3.0 Power
Switch Requirements
• 2.6-GHz Bandwidth USB 2.0 Data Switch
• 73-mΩ (typ.) High-Side MOSFET
• Adjustable Current Limit up to 2.8 A (typical)
• OUT Discharge Through CTLx=000
(TPS2540/40A) or DSC (TPS2541/41A) Input
• Longer Detach Detection Time (TPS2540A/41A)
Supporting Additional Legacy Devices
• Available in 16-Pin QFN Package

APPLICATIONS
• USB Ports/Hubs
• Notebook PCs
• Universal Wall Charging Adapter

DESCRIPTION
The TPS2540/40A and TPS2541/41A are a
combination of current-limited USB port power switch
with a USB 2.0 high-speed data line (D+/D-) switch
and a USB charging port identification circuit.
Applications include notebook PCs and other
intelligent USB host devices. The wide bandwidth (2.6
GHz) data-line switch also features low capacitance
and low on resistance, allowing signals to pass with
minimum edge and phase distortion. The
TPS2540/40A/41/41A monitors D+ and D-, providing
the correct hand-shaking protocol with compliant
client devices.
The TPS2540/40A/41/41A supports the following
charging logic schemes:
• USB 2.0 BC1.2
• Chinese Telecom Standard YD/T 1591-2009
• Divider Mode, compliant with Apple devices such
as iPod® and iPhone®
CTL1-CTL3 logic inputs are used to select one of the
various charge modes provided by the TPS2540/40A
and TPS2541/41A. These charge modes allow the
host device to actively select between Dedicated
Charging Port (DCP) (wall-adapter emulation),
Charging Downstream Port (CDP) (active USB 2.0
data communications with 1.5-A support), or
Standard Downstream Port (SDP) USB 2.0 Mode
(active USB 2.0 data communications with 500-mA
support). The TPS2540/40A/41/41A also integrates
an auto-detect feature that supports both DCP
schemes for Battery Charging Specification (BC1.2)
and the Divider Mode without the need for outside
user interaction.