Features • Ideal for conversion from 1.8V or 1.5V inputs • Designed for use with low ESR ceramic capacitors • 0.8V, 1.2V and 1.5V standard voltages available • Ultra low dropout voltage (210mV @ 3A typ) • 1.5% initial output accuracy • Load regulation of 0.1%/A (typical) • 30nA quiescent current in shutdown (typical) • Low ground pin current at all loads • Over temperature/over current protection • Available in 5 lead TO220 and TO263 packages • -40°C to +125°C junction temperature range Description The LP38843 is a high-current, fast-response regulator which can maintain output voltage regulation with minimum input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: Vbias provides voltage to drive the gate of the N-MOS power transistor, while Vin is the input voltage which supplies power to the load. The use of an external bias rail allows the part to operate from ultra low Vin voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability. The fast transient response of these devices makes them suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The parts are available in TO-220 and TO-263 packages. Dropout Voltage: 210 mV (typ) @ 3A load current. Quiescent Current: 30 mA (typ) at full load. Shutdown Current: 30 nA (typ) when S/D# pin is low. Precision Output Voltage: 1.5% room temperature accuracy. Applications • ASIC Power Supplies In: - Desktops, Notebooks, and Graphics Cards, Servers - Gaming Set Top Boxes, Printers and Copiers • Server Core and I/O Supplies • DSP and FPGA Power Supplies • SMPS Post-Regulator

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Typical Application click for larger image	Block Diagram click for larger image
Typical Performance *click for larger image

Datasheet

Title		Size	Date	Other Language
	LP38843 3A Ultra Low Dropout Linear Regulators Stable with Ceramic Output Capacitors	656 Kbytes	11-Sep-06	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1457: Application Note 1457 LP3884X-ADJ Evaluation Board	431 Kbytes	16-Jun-06

More Application Notes

Title		Size	Date	Other Language
	AN-1457: Application Note 1457 LP3884X-ADJ Evaluation Board	431 Kbytes	16-Jun-06

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LP38843S-0.8	CS065	2	38968	52	0	4402000	1	1249079519
LP38843S-1.2	CS065	2	38968	52	0	4402000	1	1249079519
LP38843S-1.5	CS065	2	38968	52	0	4402000	1	1249079519
LP38843SX-0.8	CS065	2	38968	52	0	4402000	1	1249079519
LP38843SX-1.2	CS065	2	38968	52	0	4402000	1	1249079519
LP38843SX-1.5	CS065	2	38968	52	0	4402000	1	1249079519
LP38843T-0.8	CS065	2	38968	52	0	4402000	1	1249079519
LP38843T-1.2	CS065	2	38968	52	0	4402000	1	1249079519
LP38843T-1.5	CS065	2	38968	52	0	4402000	1	1249079519

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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