TPS2145 Datasheet, PDF (1/29 Pages) Texas Instruments – LDO AND DUAL SWITCH WITH CONTROLLED RISE TIMES FOR DSP AND PORTABLE APPLICATIONS

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 current-
limited 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.
LDO and dual switch family selection guide and schematics
VIN/SW1
LDO_EN
EN1
SW2
EN2
GND
TPS2145/55
TSSOP−14
LDO
LDO_OUT
VIN/SW1
LDO_ADJ
OC1
OUT1
OUT2
OC2
EN1
SW2
EN2
GND
TPS2147/57
MSOP−10
LDO
LDO_OUT
VIN/SW1
OC1
OUT1
LDO_EN
EN2
OUT2
OC2
EN1
GND
TPS2148/58
MSOP−8
LDO
LDO_OUT
VIN
OUT2
OUT1
EN1
EN2
GND
TPS2149/59
MSOP−8
LDO
LDO_OUT
OUT1
OC
OUT2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright  2001, Texas Instruments Incorporated
www.ti.com
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