A
M I C R O S E M I
C O M P A N Y
LX8385x-xx
3A Low Dropout Positive Regulators
P
RODUCTION
D
ATA
S
HEET
The LX8385/85A/85B Series ICs are
positive regulators designed to provide 3A
output current. These regulators yield
higher efficiency than currently available
devices with all internal circuitry designed
to operate down to a 1V input-to-output
differential. In each of these products, the
dropout voltage is fully specified as a
function of load current. Dropout is
guaranteed at a maximum of 1.3V
(8385A/B) and 1.5V (8385) at maximum
output current, decreasing at lower load
currents.
In addition, on-chip trimming adjusts the
reference voltage tolerance to 1% maximum
at room temperature and 2% maximum over
the 0 to 125擄C range for the LX8385A. The
LX8385B offers 0.8% tolerance at room
temperature and 1.0% maximum over line,
load and temperature. Fixed versions are
also available and specified in the Available
Options table below.
The LX8385/85A/85B Series devices are
pin-compatible with earlier 3-terminal
regulators, such as the 117 series products,
but they do require input and output
capacitors. A minimum 10碌F capacitor is
required on the input and a 15碌F or greater
on the output of these new devices for
stability. Although, these capacitors are
generally included in most regulator designs.
The LX8385/85A/85B Series quiescent
current flows into the load, thereby
increasing efficiency. This feature contrasts
with PNP regulators where up to 10% of the
output current is wasted as quiescent
current.
The LX8385-xxI is specified over the
industrial temperature range of -25擄C to
125擄C, while the LX8385-xxC / 85A-xxC /
85B-xxC is specified over the commercial
range of 0擄C to 125擄C.
Three-Terminal Adjustable Or
W W W .
Microsemi
.
COM
Fixed Output
Guaranteed 1% Voltage
Reference Accuracy Over Line,
Load, And Temperature
(LX8385B)
Guaranteed < 1.5V Headroom At
3A (LX8385)
Guaranteed < 1.3V Headroom At
3A (LX8385A/8385B)
0.015% Line Regulation
0.15% Load Regulation
High Efficiency Linear
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
Regulators
Post Regulators For Switching
Power Supplies
Battery Chargers
Constant Current Regulators
Graphics & Standard Supplies
Processor I/O Supply
Low Voltage Memory & Chipset
Supplies
IN
5V
+
*150 0碌 F
6M V 1 500G X
S anyo
121
鈩?/div>
1%
OUT
LX 8385A
AD J
200
鈩?/div>
1%
+
3.3V
at 3A
LX8385/85A/85B-00
LX8385/85A/85B-33
LX8385/85A/85B-05
Adjustable
3.3V
5.0V
150 0碌 F
2x 6M V 1 500G X
S anyo
Table 1
- Available Options
LX8385
X
LX8385
X
Max Ref Max Dropout
Accuracy
Voltage
0 to 125
2.0%
1.5V
2.0%
1.3V
1.0%
1.3V
-25 to 125 2.0%
1.5V
T
A
(擄C)
Plastic TO-252
DT
(D-Pak) 3-Pin
LX8385-xxCDT
LX8385A-xxCDT
LX8385B-xxCDT
LX8385-xxIDT
Plastic TO-220
P
3-Pin
LX8385-xxCP
LX8385A-xxCP
LX8385B-xxCP
LX8385-xxIP
Plastic TO-263
DD
3-Pin
LX8385-xxCDD
LX8385A-xxCDD
LX8385B-xxCDD
LX8385-xxIDD
Note: Available in Tape & Reel.
Append the letter 鈥淭鈥?to the part number. (i.e. LX8385-xxCPT)
Copyright
漏
2000
Rev. 2.0a, 2001-03-15
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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