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.