FEATURES

Two 340-mΩ (Typical) High-Side MOSFETs

200 mA Low-Dropout Voltage Regulator In

Fixed 3.3-V or Adjustable Versions

Independent Thermal- and Short-Circuit

Protection for LDO and Each Switch

Overcurrent Indicators With Transient Filter

2.9-V to 5.5-V Operating Range

CMOS- and TTL-Compatible Enable Inputs

75-μA (Typical) Supply Current

Available in 10-Pin MSOP or 14-Pin TSSOP

(PowerPAD)

−40°C to 85°C Ambient Temperature Range

APPLICATIONS

USB Hubs and Peripherals

− Keyboards

− Zip Drives

− Speakers and Headsets

PDAs and Portable Electronics

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 surges during switching. The charge pump

requires no external components.

The LDO has a drop-out voltage of only 0.35 V and with

the independent enable on the TPS2145 LDO, the LDO

can be used as an additional switch. The LDO output

range for the TPS2145 is 1 V to 3.3 V, while the

TPS2147 is fixed at 3.3 V.

The TPS2145 and TPS2147 have active-low switch

enables and the TPS2155 and TPS2157 have

active-high switch enables.