Document
A
M I C R O S E M I
C O M P A N Y
LX8610-xx
1A BiCMOS Very Low Dropout Regulators
P RELIMINARY D ATASHEET
The LX8610 family are positive very low dropout regulators. They are designed to provide a power supply for very low headroom applications, such as 3.3V– 2.5V. BiCMOS technology allows an effective series pass element resistance, RDS(ON) of 250m
dropout voltage of 250mV at 1A. Low Quiescent Current and LogicControlled Shutdown help conserve battery life and increase system efficiency. Typical quiescent current is under 400µA irrespective of load current, while the shutdown current is only 10µA. The device will enter shutdown mode when the ENABLE pin is pulled low. Thermal & Short-Circuit Current Limiting: the LX8610 limits the current when the output is shorted, so protecting sensitive load circuits. The device will also turn off if the junction temperature exceeds 155°C. Available in small outline SOT-223 and 8-pin SOIC: Adjustable versions use the 8-pin SOIC and fixed output voltage devices are supplied in the 3-lead SOT-223.
Dropout Voltage Typically
W W W . Microsemi . COM
250mA At 1A And 50mV At 10mA Low Quiescent Current, Under 400µA, Irrespective Of Load Shutdown Current 10µA Adjustable Output Version In 8-pin SOIC Package Fixed Outputs Of 2.5V, 3.3V Available In 3-Pin SOT-223 Package Low Reverse Leakage Current Short-Circuit And Thermal Shutdown Protection
3.3V & 2.5V Supplies For
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Memory, Microprocessors, Clock Circuits, Etc. Portable Equipment
L X 86 1 0 -xx S im p lified B lock D ia gram
V IN
Current Lim it Reference Current Charge P um p RA
V OUT
A D J*
1 .2 5 V
RB
E N A B LE * GND
V IN /2
RA RB 25K 25K
Reverse V oltage S ense
L X 8 6 1 0-0 0
25K 41K
Therm al S hutdown
* A d ju sta b le 8 le a d ve rsio n on ly
L X 8 6 1 0-2 5 L X 8 6 1 0-3 3
LX8610-XX
TJ (°C)
0 to 125°C
OUTPUT ST PLASTIC SOT-233 DM Plastic SOIC 8-PIN VOLTAGE 3-PIN
3.3 2.5 ADJ (00) LX8610-33CST LX8610-25CST – LX8610-33CDM LX8610-25CDM LX8610-00CDM
Note: Available in Tape & Reel. Append the letter “T” to the part number. (i.e. LX8610CDMT)
Copyright © 2000 Rev. 0.6f,2000-09-15
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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A
M I C R O S E M I
C O M P A N Y
LX8610-xx
1A BiCMOS Very Low Dropout Regulators
P RELIMINARY D ATASHEET
Input Voltage (VIN) ......................................................................................................6.5V Enable Pin ..............................................................................................-0.3V to V IN+0.3V Operating Junction Temperature Plastic (ST & DM) Packages .................................125°.