Texas Instruments Inc. (Dallas, TX) announced its new TPS2140/41/50/51 family of ICs combining a low-dropout (LDO) regulator and a single switch with a dual current limit for power management in USB applications. The new device provides a complete power management solution for high-power USB peripherals, such as ADSL modems, PC and digital still cameras, zip drives and digital speakers.
The new TPS2140/41/50/51 IC family is compliant with USB 1.0 and 2.0 specifications; saves board space over typical two-chip solutions; and simplifies design, reduces system cost and speeds time to market. The integrated MOSFET switch in the TPS2140/41/50/51 features two current limits. At system power-up, output current is limited to 100mA. Once the output voltage is established, the current limit increases to 800mA (minimum) to provide short-circuit protection while allowing the peripheral to draw maximum current from the USB bus.
In addition, the TPS2140/41/50/51 provides a 250mA LDO voltage regulator with enable and current-limit functions. The LDO regulates a 2.7V to 5.5V input down to an adjustable 0.9V to 3.3V output for use by USB circuitry. Both the switch and the LDO power supplies feature under-voltage lockout and power-good functions. Enable inputs are compatible with both CMOS and TTL switching levels.
The new TPS2140/41/50/51 LDO switch combos are now available in a 14-pin PowerPAD thin-shrink, small-outline package.
