LX8117-XX_05 Datasheet, PDF (1/11 Pages) Microsemi Corporation – 0.8 , 1 & 1 .2A LOW DROPOUT POSI T I V E REGULATORS

THE INFINITE POWER OF INNOVATION
LX8117-xx / 8117A-xx / 8117B-xx
0.8, 1 & 1.2A LOW DROPOUT POSITIVE REGULATORS
PRODUCTION DATA SHEET
DESCRIPTION
The LX8117/8117A/8117B series are positive
Low Dropout (LDO) regulators. At the designed
maximum load current, the LX8117 series
dropout voltage is guaranteed to be 1.2V or
lower at 0.8A (LX8117A 1.3V @ 1A). The
dropout voltage decreases with load current.
An adjustable output voltage version of the
LX8117/17A/17B is available, as well as
versions with fixed outputs of 2.5V, 2.85V, 3.3V
and 5V. The 2.85V version is specifically
designed for use as a component of active
termination networks for the SCSI bus. On-chip
trimming of the internal voltage reference allows
specification of the initial output voltage to
within ±1% of its nominal value. The output
current-limit point is also trimmed, which helps
to minimize stress on both the regulator and the
system power source when they are operated
under short-circuit conditions. The regulator's
internal circuitry will operate at input-to-output
differential voltages down to 1V.
Most regulator circuit designs include output
capacitors with values in the range of tens to
hundreds of microfarads or more. The
LX8117/17A/17B typically requires at least
10µF of output capacitance for stable operation.
PNP-type regulators can waste current equal
to as much as 10 percent of their output as a
quiescent current which flows directly to
ground, bypassing the load. Quiescent current
from the LX8117/17A/17B flows through the
load, increasing power-use efficiency and
allowing cooler operation.
The LX8117 is available in low-profile
plastic SOT-223 and D-Pak packages for
applications where space is at a premium. The
LX8117 is also available in a plastic TO-263
package for instances when the thermal
resistance from the circuit die to the
environment must be minimized.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
„ 0.2% Line Regulation Maximum
„ 0.4% Load Regulation Maximum
„ Output Current Of 800mA
„ Regulates Down To 1.2V
Dropout (LX8117) And 1.3V
Dropout (LX8117A)
„ Operates Down To 1V Dropout
„ Space Saving SOT-223 Surface
Mount Package
„ Guaranteed Dropout Voltage At
Multiple Current Levels
„ Three-Terminal Adjustable Or
Fixed 2.5V, 2.85V, 3.3V & 5V
APPLICATIONS
„ Battery Chargers
„ Active SCSI Terminators
„ 5V To 3.3V Linear Regulators
„ High-Efficiency Linear
Regulators
„ Post Regulators For Switching
Supplies
PRODUCT HIGHLIGHT
ACTIVE TERMINATOR FOR SCSI-2 B US
Available Options Per Part #
Part #
Output Voltage
4.75V to
5.25V
LX8117-28
IN
OUT
GND
10 µF
22 µF
110 Ω
110 Ω
110 Ω
18 to 27
Lines
LX8117(x)-25
2.5V
LX8117(x)-28
2.8V
LX8117(x)-33
3.3V
LX8117(x)-05
5V
(x) – denotes O/P Current Setting
110 Ω
T_A (°C)
0 to 125
O/P
Current
0.8A
1.0A
1.2A
PACKAGE ORDER INFO
Plastic SOT-223
Plastic TO-263
ST _3-Pin
DD _3-Pin
RoHS Compliant / Pb-free RoHS Compliant / Pb-free
Transition DC: 0522
Transition DC: 0535
LX8117-xxCST
LX8117-xxCDD
LX8117A-xxCST
LX8117A-xxCDD
LX8117B-xxCST
LX8117B-xxCDD
Plastic TO-252
DT _{(D-Pak) 3-Pin}
RoHS Compliant / Pb-free
Transition DC: 0532
LX8117-xxCDT
LX8117A-xxCDT
LX8117B-xxCDT
Note: Available in Tape & Reel. Append the letter “TR” to the part number. (i.e. LX8117-00CST-TR)
Copyright © 2000
Rev. 1.5a,2005-10-25
MICROSEMI INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: [phone]
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