TPS2149
TPS2159
SLVS401 – AUGUST 2001
3.3-V LDO AND DUAL SWITCH
FOR USB BUS-POWERED HUB POWER MANAGEMENT
FEATURES
DESCRIPTION
Complete Power Management Solution for
USB Bus-Powered Hubs
The TPS2149 incorporates two power distribution
switches and an LDO in one small package, providing
a USB bus-powered hub power management solution
that saves up to 60% in board space over typical
implementations.
3.3-V 200 mA Low-Dropout Voltage Regulator
Two 5-V 340-mΩ (Typ) High-Side MOSFETs
Independent Thermal- and Short-Circuit
Protection for LDO and Each Switch
The TPS2149 meets USB 2.0 bus-powered hub
requirements. An integrated LDO regulates the 5-V bus
power down to 3.3 V for the USB controller. The two
MOSFET switches provide power to the downstream
ports. With independent enables, the downstream ports
remain unpowered until the hub completes
enumeration.
Overcurrent Indicator With Transient Filter
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
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.
APPLICATIONS
USB Bus-Powered Hubs
– Keyboards
– Monitors
The TPS2149 has active-low enables while the
TPS2159 has active-high enables.
– Hub Boxes
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
V
IN/SW1
VIN/SW1
LDO_OUT
VIN
LDO
VIN/SW1
LDO_EN
LDO_OUT
OUT2
LDO
LDO_OUT
LDO
LDO
LDO_EN
EN2
OC1
OC1
OUT1
OC
OUT1
OUT1
EN1
OUT1
EN1
EN1
OUT2
OUT2
OC2
OUT2
OC2
SW2
EN2
GND
SW2
EN2
GND
EN1
GND
EN2
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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TI [ TEXAS INSTRUMENTS ]
