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TPS2148 Datasheet

  • TPS2148

  • 用于 USB 外设的 3.3V LDO + 双路开关，工作态低电平启用

  • 553.39KB

  • 21页

  • TI

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TPS2148
TPS2158
SLVS373 鈥?AUGUST 2001
3.3-V LDO AND DUAL SWITCH
FOR USB PERIPHERAL POWER MANAGEMENT
FEATURES
DESCRIPTION
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.
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.
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.
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 TPS2148 has active-low enables while the
TPS2158 has active-high enables.
D
D
D
D
D
D
D
D
D
D
Complete Power Management Solution for
USB Bus-Powered Peripherals
3.3-V 200 mA Low-Dropout Voltage Regulator
With Enable
3.3-V 340-m鈩?(Typ) High-Side MOSFET
5-V 340-m鈩?(Typ) High-Side MOSFET
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-碌A (Typ) Supply Current
Available in 8-Pin MSOP (PowerPAD铮?
鈥?0掳C to 85掳C Ambient Temperature Range
APPLICATIONS
D
USB Peripherals
鈥?Digital Cameras
鈥?Zip Drives
鈥?Speakers and Headsets
LDO and dual switch family selection guide and schematics
TPS2145/55
TSSOP鈥?4
VIN/SW1
LDO_EN
LDO
LDO_OUT
LDO_ADJ
OC1
OUT1
EN1
SW2
EN2
GND
OUT2
OC2
EN1
SW2
EN2
GND
OUT2
OC2
EN1
GND
OC1
OUT1
LDO_EN
OUT2
EN2
OUT1
EN2
GND
EN1
OUT1
OC
OUT2
VIN/SW1
TPS2147/57
MSOP鈥?0
LDO
LDO_OUT VIN/SW1
TPS2148/58
MSOP鈥?
LDO
LDO_OUT
VIN
TPS2149/59
MSOP鈥?
LDO
LDO_OUT
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
铮?/div>
2001, Texas Instruments Incorporated
www.ti.com
1

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