Power management ICs combine discrete functions to provide compact solutions
7 September 2005Power Electronics / Power Management
Fire & Safety
Microchip has introduced a series of power management ICs that combine a synchronous buck switching regulator, low dropout (LDO) regulator and power-good function into single-chip solutions.
The TC1303/TC1304 and TC1313 include the 500 mA buck regulator, and the 300 mA LDO. The differences between the five devices relate to the power-good function.
* The TC1303A power-good operates on the buck regulator output.
* The TC1303B power-good operates on the LDO output.
* The TC1303C power-good operates on both the buck regulator and LDO outputs.
* The TC1304 power-good is used to provide a power sequencing function.
* The TC1313 does not feature a power-good function.
These devices provide a low-power, low-cost, minimal board space solution for a variety of battery-operated and dual output voltage systems, says the company. Package options include low-profile (0,9 mm) 3 x 3 mm 10-pin DFN package.
The synchronous buck regulator is a very efficient switching DC-DC converter. Under heavier loads, the converter operates in PWM mode at a fixed 2,0 MHz switching frequency. For lighter loads, such as in a standby mode, the converter switches to a power-saving pulse frequency modulation (PFM) mode. The regulator has adjustable and fixed output voltage options.
The low-noise linear LDO regulator supports up to a 300 mA load with a very low dropout voltage (137 mV at 200 mA typical), and is stable with a single, 1,0 µF ceramic capacitor on the output. All the devices offer a number of protection features, including under-voltage lockout, over-temperature protection and output short circuit protection.
The TC1303/TC1313 devices offer individual shutdown controls for the two regulators, while the TC1304 uses the power-good function together with the SHDN pin to provide a power-sequencing function (where, during power-up, the LDO must be operating within specification before the buck regulator is activated, and, during power-down, the buck regulator output is disabled prior to the LDO output).
To help demonstrate the effectiveness of these power management solutions, the company's TC1303BDM-DDBK1 demonstration board is available.
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