National Semiconductor Introduces Three Tiny LDO Voltage Regulators With Excellent Transient Performance
Worldwide power management leader National Semiconductor Corporation (NYSE:NSM), today introduced three low-dropout voltage regulators (LDOs) for both digital as well as analog loads in battery-powered systems such as portable medical equipment, navigation systems, handheld scanners, digital signal processing and microprocessor core supply applications.
Powerful LDOs Offer PSRR of Over 60 dB
The LP5951, LP3996 and LP5996 LDOs each feature typically less than 50 mV of transient performance. The power supply rejection ratio (PSRR) of better than 60 dB reduces the switching noise from the switching regulator to provide a clean output voltage. Utilizing small SOT-23, LLP and SC-70 packaging along with tiny 0402 ceramic capacitors, the LDOs provide a complete solution that measures less than 20 mm squared.
Available in an ultra-tiny SC-70 package, the LP5951 LDO supports an input voltage below 2V and output voltage as low as 1.3V. It is well-suited for use in designs that require the post regulator to follow a switcher. The LP3996 and LP5996 each pack two LDOs into a tiny 10-pin thermally enhanced LLP package that measures 3 mm by 3 mm. Using separate enable inputs, the dual outputs can be sequenced to ensure that the input/output (I/O) of a processor is powered before its core. In addition, the LP3996 features a power-on-reset (POR) output that can be used to keep a digital processor in a reset state until the power supply is within regulation.
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