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LDOs handle digital, analog loads in battery-run apps

Posted: 27 Nov 2006 ?? ?Print Version ?Bookmark and Share

Keywords:National Semiconductor? LP5951? LP3996? LP5996? LDO?

 LP5951, LP3996, LP5996 LDOs from National

National Semiconductor Corp. has unveiled three new low-dropout (LDOs) voltage regulators for both digital and analog loads in battery-powered systems such as portable medical equipment, navigation systems, handheld scanners and DSP and MPU core supply applications.

The LP5951, LP3996 and LP5996 LDOs each feature typically less than 50mV of transient performance. With better than 60dB power supply rejection ratio (PSRR), these devices provide a clean output voltage. Using small SOT-23, LLP and SC-70 packaging along with tiny 0402 ceramic capacitors, the LDOs provide a complete solution that measures less than 20mm?.

Available in an ultratiny SC-70 package, the LP5951 LDO supports an input voltage below 2V and output voltage as low as 1.3V. It is suitable 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-by-3mm. Using separate enable inputs, the dual outputs can be sequenced to ensure that the 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.

Available in both 5-pin SOT-23 and SC-70 packages, the LP5951 is a 150mA CMOS LDO that provides regulated output voltage and low quiescent current. When switched to shutdown mode via a logic signal at the enable pin, the power consumption is reduced to virtually zero. The LP5951 is designed to be stable with small 0402 size ceramic capacitors. The LP5951 also features internal protection against short-circuit currents and over-temperature conditions. Performance is specified for a -40C to 125C junction temperature range. The device is available in fixed output voltages from 1.3V to 3.3V.

The LP3996 is a dual-output CMOS LDO. It supports a 300mA load on one output and a 150mA load on the other output with less than 36?A of quiescent current for both channels enabled simultaneously during standby. The LM3996 has fast transient performance and supports small 0603 size 1?F capacitors at both input and output. For analog loads, the noise and PSRR performance levels can be further improved with the use of an external bypass capacitor.

The LP5996 is a dual output CMOS LDO voltage regulator with the same package and features as the LP3996, but does not include POR.

Available today, the LP3996 is priced at 54 cents and the LP5996 at 49 cents. The LP5951 is priced at 23 cents in a SOT-23 package and 25 cents in a SC-70 package. Pricing is in 1,000 units.

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Related Datasheets
Part Number Description Category
? LP5996 Dual Linear Regulator with 300mA and 150mA Outputs ICs, Interface
? LP3996 Dual Linear Regulator with 300mA and 150mA Outputs and Power-On-Reset ICs, Interface
? LP5951 Micropower, 150mA Low-Dropout CMOS Voltage Regulator ICs, Interface



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