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.