TPS2147| Datasheet

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TPS2145, TPS2147 TPS2155, TPS2157

SLVS333 - AUGUST 2001

LDO AND DUAL SWITCH WITH CONTROLLED RISE TIMES FOR DSP AND PORTABLE APPLICATIONS
FEATURES D Two 340-m (Typical) High-Side MOSFETs D 200 mA Low-Dropout Voltage Regulator In D D D D D D D
Fixed 3.3-V or Adjustable Versions Independent Thermal- and Short-Circuit Protection for LDO and Each Switch Overcurrent Indicators With Transient Filter 2.9-V to 5.5-V Operating Range CMOS- and TTL-Compatible Enable Inputs 75-uA (Typical) Supply Current Available in 10-Pin MSOP or 14-Pin TSSOP (PowerPAD) -40 C to 85 C Ambient Temperature Range

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 currentlimited switch is a 340-m 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 t
he 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.

APPLICATIONS D USB Hubs and Peripherals
- Keyboards - Zip Drives - Speakers and Headsets PDAs and Portable Electronics DSP Power Sequencing

D D

LDO and dual switch family selection guide and schematics
TPS2145/55 TSSOP-14 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-10 LDO LDO_OUT VIN/SW1 TPS2148/58 MSOP-8 LDO LDO_OUT VIN TPS2149/59 MSOP-8 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.

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