TPS2148
TPS2158
SLVS373 – AUGUST 2001
3.3-V LDO AND DUAL SWITCH
FOR USB PERIPHERAL POWER MANAGEMENT
FEATURES
DESCRIPTION
Complete Power Management Solution for
USB Bus-Powered Peripherals
The TPS2148 incorporates two power distribution
switches and an LDO in one small package, providing
a USB peripheral power management solution that
saves up to 60% in board space over typical
implementations.
3.3-V 200 mA Low-Dropout Voltage Regulator
With Enable
3.3-V 340-mΩ (Typ) High-Side MOSFET
5-V 340-mΩ (Typ) High-Side MOSFET
The TPS2148 meets USB 2.0 bus-powered peripheral
requirements. An integrated LDO regulates the 5-V bus
power down to 3.3 V for the USB controller, and a
MOSFET switch that is internally connected to the
output of the LDO simplifies meeting the suspend and
enumeration current requirements imposed by the USB
specification.
Independent Thermal- and Short-Circuit
Protection for LDO and Each Switch
2.9-V to 5.5-V Operating Range
CMOS- and TTL-Compatible Enable Inputs
75-µA (Typ) Supply Current
Available in 8-Pin MSOP (PowerPAD )
–40°C to 85°C Ambient Temperature Range
A second switch is available to support a downstream
port, stage power to a second voltage regulator, or
disable power to selected circuitry in power-save
modes.
APPLICATIONS
Each power-distribution switch is capable of supplying
200 mA of continuous current, and the independent
logic enables are compatible with 5-V logic and 3-V
logic. The switches and the LDO are designed with
controlled rise times and fall times to minimize current
surges.
USB Peripherals
– Digital Cameras
– Zip Drives
– Speakers and Headsets
The TPS2148 has active-low enables while the
TPS2158 has active-high enables.
LDO and dual switch family selection guide and schematics
TPS2149/59
MSOP–8
TPS2148/58
MSOP–8
TPS2145/55
TSSOP–14
TPS2147/57
MSOP–10
LDO_OUT
LDO_ADJ
VIN/SW1
VIN
LDO
LDO_OUT
VIN/SW1
LDO_EN
VIN/SW1
LDO_OUT
LDO_OUT
LDO
LDO
LDO
LDO_EN
EN2
OC1
OC1
OUT2
OUT1
OC
OUT1
OUT1
EN1
EN1
EN1
OUT1
OUT2
OUT2
OC2
OUT2
OC2
SW2
SW2
EN1
GND
EN2
GND
EN2
EN2
GND
GND
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
1
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