LIN DOC #: 8385
LX8385-xx/8385A-xx/8385B-xx
3 A L O W
D
R O P O U T
P
O S I T I V E
R
E G U L A T O R S
T H E I N F I N I T E P O W E R O F I N N O V A T I O N
P R O D U C T I O N D A T A S H E E T
DESCRIPTION
KEY FEATURES
■ Three-Terminal Adjustable Or Fixed
TheLX8385/85A/85Bseriesdevicesare
pin-compatible with earlier 3-terminal
The LX8385/8385A/8385B series ICs are
positive regulators designed to provide
3A output current. Each regulator yields
higher efficiency than currently available
devices with all internal circuitry designed
to operate down to a 1V input-to-output-
differential. In these products, the drop-
out voltage is fully specified as a function
of load current. The LX8385's dropout is
guaranteed at a maximum of 1.5V at maxi-
mum output current, decreasing at lower
load currents. The LX8385A/85B have a
maximum dropout voltage of 1.3V.
Output Voltage
■ Guaranteed 1% Voltage Reference
Accuracy Over Line, Load And
Temperature (LX8385B)
regulators, such as 117 series products.
While a 10µF output capacitor is required
on both input and output of these new
devices, this is generally included in most
regulator designs.
The quiescent current of the LX8385/
85A/85B series products flows into the
load, increasing efficiency. This feature
contrasts with PNP regulator designs,
where up to 10% of the output current is
wasted as quiescent current.
■ Guaranteed < 1.5V Headroom At 3A
(LX8385)
■ Guaranteed < 1.3V Headroom At 3A
(LX8385A/8385B)
■ Output Current Of 3A Minimum
p 0.015% Line Regulation
p 0.1% Load Regulation
The LX8385B offers a tighter voltage
reference tolerance: ±1.0% over line, load
and temperature, with 0.8% initial accu-
racy. The LX8385/85A have 1.0% initial
accuracy, with 2% over line, load and tem-
perature.
The LX8385-xxI is rated for -25°C to
+125°Capplications, andtheLX8385-xxC
/8385B-xxC is rated for 0°C to +125°C
applications.
APPLICATIONS
■ High Efficiency Linear Regulators
■ Post Regulators For Switching
Power Supplies
■ Battery Chargers
■ Constant Current Regulators
■ Graphics & Standard Supplies
■ Processor I/O Supply
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
■ Low Voltage Memory & Chipset Supplies
3.3V, 3A REGULATOR
AVAILABLE OPTIONS PER PAR T #
IN
OUT
Output
3.3V at 3A
5V
LX8385
Part #
Voltage
121Ω
1%
1500µF, 6.3V
6MV1500GX
2x 1500µF, 6.3V
6MV1500GX
from Sanyo
LX8385/85A/85B-00
LX8385/85A/85B-33
LX8385/85A/85B-05
Adjustable
3.3V
ADJ
5.0V
Other voltage options may be available —
200
1%
Ω
Please contact factory for details.
PACKAGE ORDER INFORMATION*
Plastic TO-220
3-pin
Plastic TO-263
3-pin
Plastic TO-263
(Non-Jeded) 3-pin
Dropout
Voltage
TA (°C)
P
DD
DL
1.5V
1.3V
1.3V
1.5V
LX8385-xxCP
LX8385A-xxCP
LX8385B-xxCP
LX8385-xxIP
LX8385-xxCDD
LX8385A-xxCDD
LX8385B-xxCDD
LX8385-xxIDD
LX8385-xxCDL
LX8385A-xxCDL
LX8385B-xxCDL
—
0 to 125
-25 to 125
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number
(i.e. LX8385-00CDDT). "xx" refers to output voltage, please see table above.
* Consult factory for availability of TO-3 Metal Can.
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
Copyright © 1999
Rev. 2.0 3/99
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