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TPS2145IPWPRG4 Datasheet(PDF) 1 Page - Texas Instruments |
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TPS2145IPWPRG4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 34 page TPS2145, TPS2147 TPS2155, TPS2157 SLVS333 − AUGUST 2001 LDO AND DUAL SWITCH WITH CONTROLLED RISE TIMES FOR DSP AND PORTABLE APPLICATIONS 1 www.ti.com FEATURES D Two 340-mΩ (Typical) High-Side MOSFETs D 200 mA Low-Dropout Voltage Regulator In Fixed 3.3-V or Adjustable Versions D Independent Thermal- and Short-Circuit Protection for LDO and Each Switch D Overcurrent Indicators With Transient Filter D 2.9-V to 5.5-V Operating Range D CMOS- and TTL-Compatible Enable Inputs D 75-µA (Typical) Supply Current D Available in 10-Pin MSOP or 14-Pin TSSOP (PowerPAD ) D −40°C to 85°C Ambient Temperature Range APPLICATIONS D USB Hubs and Peripherals − Keyboards − Zip Drives − Speakers and Headsets D PDAs and Portable Electronics D DSP Power Sequencing DESCRIPTION Two power-distribution switches and an adjustable (TPS2145) or fixed (TPS2147) LDO are incorporated in one small package, providing a power management solution that saves up to 60% in board space over typical implementations. Designed to meet USB 2.0 bus-powered hub requirements, these devices also allow core and I/O voltage sequencing in DSP applications, or power segmentation in portable equipment. Each current- limited switch is a 340-m Ω N-channel MOSFET capable of supplying 200 mA of continuous current. A logic enable compatible with 5-V logic and 3-V logic controls each MOSFET as well as the LDO in the TPS2145. The internal charge pump provides the gate drive controlling the power-switch rise times and fall times, minimizing current surges during switching. The charge pump requires no external components. The LDO has a drop-out voltage of only 0.35 V and with the independent enable on the TPS2145 LDO, the LDO can be used as an additional switch. The LDO output range for the TPS2145 is 1 V to 3.3 V, while the TPS2147 is fixed at 3.3 V. The TPS2145 and TPS2147 have active-low switch enables and the TPS2155 and TPS2157 have active-high switch 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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