TPS2155

TPS2145, TPS2147 TPS2155, TPS2157 SLVS333 − AUGUST 2001 LDO AND DUAL SWITCH WITH CONTROLLED RISE TIMES FOR DSP AND PORTABLE APPLICATIONS FEATURES D Two 340-mΩ (Typical) High-Side MOSFETs D 200 mA Low-Dropout Voltage Regulator In Fixed 3.3-V or Adjustable Versions D Independent Thermal- and Short-Circuit Protection for LDO and Each Switch D Overcurrent Indicators With Transient Filter D 2.9-V to 5.5-V Operating Range D CMOS- and TTL-Compatible Enable Inputs D 75-µA (Typical) Supply Current D Available in 10-Pin MSOP or 14-Pin TSSOP (PowerPAD) D −40°C to 85°C Ambient Temperature Range APPLICATIONS D USB Hubs and Peripherals − Keyboards − Zip Drives − Speakers and Headsets D PDAs and Portable Electronics D DSP Power Sequencing DESCRIPTION Two power-distribution switches and an adjustable (TPS2145) or fixed (TPS2147) LDO are incorporated in one small package, providing a power management solution that saves up to 60% in board space over typical implementations. Designed to meet USB 2.0 bus-powered hub requirements, these devices also allow core and I/O voltage sequencing in DSP applications, or power segmentation in portable equipment. Each currentlimited switch is a 340-mΩ N-channel MOSFET capable of supplying 200 mA of continuous current. A logic enable compatible with 5-V logic and 3-V logic controls each MOSFET as well as the LDO in the TPS2145. The internal charge pump provides the gate drive controlling the power-switch rise times and fall times, minimizing current surg...