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TPS2145IPWP Fiches technique(PDF) 1 Page - Texas Instruments |
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TPS2145IPWP Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 19 page TPS2148 TPS2158 SLVS373 – AUGUST 2001 3.3-V LDO AND DUAL SWITCH FOR USB PERIPHERAL POWER MANAGEMENT 1 www.ti.com FEATURES D Complete Power Management Solution for USB Bus-Powered Peripherals D 3.3-V 200 mA Low-Dropout Voltage Regulator With Enable D 3.3-V 340-mΩ (Typ) High-Side MOSFET D 5-V 340-mΩ (Typ) High-Side MOSFET D Independent Thermal- and Short-Circuit Protection for LDO and Each Switch 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 Peripherals – Digital Cameras – Zip Drives – Speakers and Headsets 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. LDO and dual switch family selection guide and schematics LDO LDO_OUT LDO_ADJ OC1 OUT1 OUT2 OC2 VIN/SW1 LDO_EN EN1 SW2 EN2 GND TPS2145/55 TSSOP–14 LDO OC1 OC2 EN1 SW2 EN2 GND TPS2147/57 MSOP–10 LDO EN2 EN1 GND TPS2148/58 MSOP–8 LDO OC EN1 EN2 GND TPS2149/59 MSOP–8 VIN/SW1 LDO_OUT OUT1 OUT2 VIN/SW1 LDO_EN LDO_OUT OUT2 OUT1 VIN LDO_OUT OUT1 OUT2 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. PowerPAD is a trademark of Texas Instruments. Copyright 2001, Texas Instruments Incorporated 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. |
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