Product category: Power Supply ICs and Controllers
News Release from: National Semiconductor | Subject: LP3881 and LP3882
Edited by the Electronicstalk Editorial Team on 23 April 2003
Dual LDOs keep current under control
Two new CMOS dual-input low-dropout (LDO) voltage regulators are claimed to offer the industry's lowest dropout.
Two new CMOS dual-input low-dropout (LDO) voltage regulators are claimed to offer the industry's lowest dropout Optimised for low-voltage high-current applications in PCs and set-top boxes, this new family of LDOs enables high efficiency linear conversion while consuming ultra-low quiescent current of only 3mA under all conditions
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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In contrast, the quiescent current of bipolar alternatives increases to over 100mA as the regulator approaches dropout.
"The ultra-low dropout of 160mV and ultralow quiescent current make National's LP3881 the industry's most power efficient LDO in applications generating a regulated 1.5V output from a 1.8V input", said Johan Hedman, Marketing Manager of National Semiconductor's Power Management Group in Europe.
"With the LP388x family, designers now have a linear alternative to complex, noisy switching regulators when generating output voltages down to 1.2V".
The LP388x family now includes the two new devices, the LP3881 and LP3882, and the recently released LP3883, providing a significant power savings to customers.
This family uses a separate input to power the control circuitry; the power input may be fed independently from the high current supply facilitating conversion from input rails of less than 2.5V.
The CMOS dual input architecture allows for an ultra low input voltage and low output voltages down to 1.2V.
The dropout voltage for the LP3883/2/1 is typically 210/110/75mV at 3/1.5/0.8A and a maximum of 420/270/160mV over temperature, the best in the industry.
The LP388x family's unique circuit approach enables delivery of custom voltages in 50mV increments in the range of 1.25 to 1.8V.
The LP388x family has an output voltage accuracy of +/-3% over line, load and temperature variations and features on/off control, overtemperature and overcurrent protection.
National Semiconductor's LP388x family of high current, low voltage CMOS LDOs is shipping today in TO220-5 lead and TO263-5 lead packages.
In 1000-unit quantities, the LP3881 is priced at $2.08 each, the LP3882 is priced at $2.18 each and the LP3883 is priced at $2.68 each.
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