1 Features
1• Integrated Synchronous Boost Converter, LDO,
and Dual USB Current-Limited Switches
• 1.8-V to 5.25-V Input Voltage
(2.2-V Minimum Start-Up Voltage)
• Adjustable Independent USB Current Limit
– 100 mA to 1100 mA
• Auxiliary 5.1-V Output
• 3.3-V Linear Regulator Output
• Inrush Current < 100 mA
• Minimal External Components Required
• Deglitched Independent Fault Reporting
• Small 5-mm × 5-mm QFN-20 Package
• Industrial Temperature Range

2 Applications
• Portable Applications Using Single Li+ Cell
• Bus Powered USB Hosts
• USB Hosts Without Native 5-V Supplies
• Computer Peripherals

3 Description
The TPS2505 device provides an integrated solution
to meet USB 5-V power requirements from a 1.8-V to
5.25-V input supply. The features include a 5.1-V,
1100-mA boost converter, a 200-mA, 3.3-V LDO
linear regulator and dual USB 2.0 compliant power
outputs with independent output switch enable,
current limit, and overcurrent fault reporting.
The 1.8-V to 5.25-V input can be supplied by sources
including DC-DC regulated supplies (for example, 3.3
V), or batteries such as single cell Li+, two-cell or
three-cell NiCd, NiMH or alkaline.
The output trip current for the dual USB switches can
be programmed through external resistors from as
low as 100 mA to as high as 1100 mA.
An auxiliary 5.1-V output is provided, where the total
current supplied by the USB outputs and the auxiliary
by cannot exceed 1100 mA.