LDO regulator offers stable output without requiring a load capacitor

Citation

(2009), "LDO regulator offers stable output without requiring a load capacitor", Microelectronics International, Vol. 26 No. 2. https://doi.org/10.1108/mi.2009.21826bad.006

LDO regulator offers stable output without requiring a load capacitor

Article Type: New products From: Microelectronics International, Volume 26, Issue 2

Analogue power supply IC specialist Torex has unveiled the XC6501 Series of high-speed LDO voltage regulators. Featuring internal phase compensation, these devices ensure a stable output within a 1.2-5 V range, without requiring a CL capacitor. The XC6501 is therefore an ideal choice for providing voltage regulation in space-constrained designs such as mobile phones, portable gaming devices and cameras.

Available in USP-3 and USP-4 packages, as well as in standard SSOT-24 and SOT-25 versions, the XC6501 Series integrates a reference voltage source, driver transistor, error amplifier, current limit circuit and phase compensation circuit. Internal phase compensation means that in addition to being tightly integrated, this part does not require output stabilisation, enabling designers to avoid the additional cost and space implications of using a separate CL capacitor. Performance is just as good without a CL capacitor as it is with.

The CMOS XC6501 Series boasts low noise and is highly precise. Output voltage can be internally set in 0.01 V increments. At typically 150 mV with a 100 mA load (Vout = 2.8 V), dropout voltage is low, further enhancing suitability to battery-powered applications.

Torex’ XC6501 regulators consume just 13 μA in operation. This can be further reduced to less than 0.1 μA when the part is put into stand-by mode using the CE pin available on the A, B, C and D versions. For applications where 13 μA consumption is sufficiently low, the XC6501P version provides “always on” capability and is available in an ultra small USP-3 package, measuring 1.2 × 1.2 mm and with a profile of just 0.6 mm.

Should a CL capacitor be used, a high speed, internal auto-discharge switch is available with the B and D versions of the XC6501 Series. This feature enables the charge at the CL capacitor to be quickly discharged when a low signal is sent to the CE pin.

The XC6501 Series require input voltages of between 1.4 and 6 V and typical ripple rejection is 50 dB at 1 kHz. Maximum output current is at least 200 mA (300 mA current limit type) over an operating temperature range of −40 to + 85°C.

More in depth information about the XC6501 Series of high-speed LDO voltage regulators, which includes a supporting datasheet, can be found directly on Torex Semiconductor Europe’s web site: www.torex-europe.com/products/range/281