TPS2157 Datasheet | Texas Instruments

FEATURES D Two 340-mΩ (Typical) High-Side MOSFETs D 200 m A 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-patible Enable Inputs D 75-µA (Typical) Supply Current D Available in 10-Pin MSOP or 14-Pin TSSOP (Power PAD) - 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 currentlimited switch is a 340-mΩ N-channel MOSFET capable of supplying 200 m A of continuous current. A logic enable patible 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 ponents. 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 VIN/SW1 LDO_EN EN1 SW2 EN2 GND TPS2145/55 TSSOP- 14 LDO_OUT VIN/SW1 LDO_ADJ OC1 OUT1 OUT2 OC2 EN1 SW2 EN2 GND TPS2147/57 MSOP- 10 LDO_OUT VIN/SW1 OC1...