TPS2149 Datasheet, PDF (1/19 Pages) Texas Instruments – 3.3-V LDO AND DUAL SWITCH FOR USB BUS-POWERED HUB POWER MANAGEMENT

TPS2149
TPS2159
SLVS401 – AUGUST 2001
3.3-V LDO AND DUAL SWITCH
FOR USB BUS-POWERED HUB POWER MANAGEMENT
FEATURES
D Complete Power Management Solution for
USB Bus-Powered Hubs
D 3.3-V 200 mA Low-Dropout Voltage Regulator
D Two 5-V 340-mΩ (Typ) High-Side MOSFETs
D Independent Thermal- and Short-Circuit
Protection for LDO and Each Switch
D Overcurrent Indicator With Transient Filter
D 2.9-V to 5.5-V Operating Range
D CMOS- and TTL-Compatible Enable Inputs
D 75-µA (Typ) Supply Current
D Available in 8-Pin MSOP (PowerPAD)
D –40°C to 85°C Ambient Temperature Range
APPLICATIONS
D USB Bus-Powered Hubs
– Keyboards
– Monitors
– Hub Boxes
DESCRIPTION
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.
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.
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.
The TPS2149 has active-low enables while the
TPS2159 has active-high enables.
LDO and dual switch family selection guide and schematics
VIN/SW1
LDO_EN
EN1
SW2
EN2
GND
TPS2145/55
TPS2147/57
TSSOP–14 _{LDO_OUT}
MSOP–10
VIN/SW1
LDO
LDO
LDO_ADJ
OC1
OUT1
OUT2
OC2
EN1
SW2
EN2
GND
VIN/SW1
LDO_OUT
TPS2148/58
MSOP–8
LDO
OC1 ^LDO_EN
OUT1 _EN2
OUT2
OC2
EN1
GND
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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