Product category: Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: TPS2140/41/50/51
Edited by the Electronicstalk Editorial Team on 6 February 2002
Single-chip USB power management
The industry's first family of ICs combining an LDO regulator and a single switch with a dual current limit for power management in USB applications is now available
The industry's first family of ICs combining an LDO regulator and a single switch with a dual current limit for power management in USB applications is now available from Texas Instruments. The new devices provide a complete power management solution for high-power USB peripherals, such as ADSL modems, PC and digital still cameras, Zip drives and digital speakers.
This article was originally published on Electronicstalk on 6 February 2002 at 8.00am (UK)
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High-performance applications that require power-up sequencing for DSPs can also benefit from the integration and space savings offered by the new solutions.
TI's new TPS2140/41/50/51 are compliant with the USB 1.0 and 2.0 specifications that are universally implemented in PCs and peripherals.
The highly integrated single-chip solution not only saves board space over today's typical two-chip solutions, but also simplifies design, reduces system cost and speeds time to market.
'This new family demonstrates TI's commitment to offering highly integrated solutions for USB applications', said Landa Pham, TI product marketing manager.
'In addition, the integrated solutions provided by this family simplify the design process'.
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The integrated mosfet switch in the new TPS2140/41/50/51 features two current limits.
At system power-up, output current is limited to 100mA.
This allows USB peripherals to employ high-value capacitance to stabilize the voltage from the USB bus, while meeting the USB startup requirements for inrush current management.
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 provide a 250mA LDO voltage regulator with enable and current limit functions.
The LDO regulates a 2.7 to 5.5V input down to an adjustable 0.9 to 3.3V output for use by USB circuitry.
Both the switch and the LDO power supplies feature undervoltage lockout and power-good functions.
The power-good function can be used to enable the switch for DSP and microcontroller sequencing.
Enable inputs are compatible with both CMOS and TTL switching levels.
Typically drawing 85uA supply current, TPS2140/41/50/51 can be used as alternatives to TI's TPS2148/58 LDO-switch combos, which offer a fixed 3.3V LDO output and two switches.
Other offerings in TI's USB portfolio include the TUSBxxx hub, peripheral, and streaming audio controllers; the TPS204xA/5xA power switches; the TPS788xx family of low-noise LDOs with inrush current control; the SN75240 transient suppressor; and the TPS207x family of power controllers for quad-port USB hub boxes.
TI's TPS2140/41/50/51 LDO-switch combos are available now in 14-pin PowerPAD thin shrink small outline packages (HTSSOPs).
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