Features • Standard VOUT values of 0.8V and 1.2V • Wide VBIAS Supply operating range of 3.0V to 5.5V • Stable with 10 µF ceramic capacitors • Dropout voltage of 130 mV (typical) at 1.5A load current • Precision Output Voltage across all line and load conditions: • ±1.0% for TJ = 25°C • ±2.0% for 0°C ≤ TJ ≤ +125°C • ±3.0% for -40°C ≤ TJ ≤ +125°C • Over-Temperature and Over-Current protection • Available in 5 lead TO-220 and TO-263 packages • Custom VOUT values between 0.8V and 1.2V are available • -40°C to +125°C Operating Temperature Range Description The LP38855 is a high-current, fast-response regulator which can maintain output voltage regulation with an extremely low input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: VBIAS provides power for the internal bias and control circuits, as well as drive for the gate of the N-MOS power transistor, while VIN 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 this device makes it suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The LP38855 is available in TO-220 and TO-263 5-Lead packages. Dropout Voltage: 130 mV (typical) at 1.5A load current. Low Ground Pin Current: 14 mA (typical) at 1.5A load current. Shutdown Current: 1 µA (typical) IIN(GND) when EN pin is low. Precision Output Voltage: ±1.0% for TJ = 25°C and ±2.0% for 0°C ≤ TJ ≤ +125°C, across all line and load conditions 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

Also Recommended LP38852▲ 1.5A Adjustable Version LP38853▲ 3A Adjustable Version LP38858▲ Fixed 0.8V & 1.2V With Soft-start MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

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

Datasheet

Title		Size	Date	Other Language
	LP38855 1.5A Fast-Response High-Accuracy LDO Linear Regulator with Enable	359 Kbytes	13-Mar-07

Featured Application Notes

Title		Size	Date	Other Language
	AN-1815: Application Note 1815 LDOs Ease the Stress of Start-Up	149 Kbytes	23-Sep-08
	AN-1504: Application Note 1504 LP38853S-ADJ Evaluation Board	573 Kbytes	13-Mar-07	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1560: Application Note 1560 LP38852MR-ADJ Evaluation Board	280 Kbytes	17-Mar-07	中文
	AN-1479: Application Note 1479 LP38856S-1.2 Evaluation Board	468 Kbytes	3-Nov-06	中文
	AN-1504: Application Note 1504 LP38853S-ADJ Evaluation Board	573 Kbytes	13-Mar-07	中文
	AN-1480: Application Note 1480 LP38859S-1.2 Evaluation Board	522 Kbytes	3-Nov-06	中文
	AN-1815: Application Note 1815 LDOs Ease the Stress of Start-Up	149 Kbytes	23-Sep-08

Design Tools

Title	Size	Date
Article - How to Power Sub-Micron CMOS Loads with an Efficient LDO

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LP38855S-0.8	CS065	2	38968	52	0	4402000	1	1249079519
LP38855S-1.2	CS065	2	38968	52	0	4402000	1	1249079519
LP38855SX-0.8	CS065	2	38968	52	0	4402000	1	1249079519
LP38855SX-1.2	CS065	2	38968	52	0	4402000	1	1249079519
LP38855T-0.8	CS065	2	38968	52	0	4402000	1	1249079519
LP38855T-1.2	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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