A MICROSEMI COMPANY
5A Low Dropout Positive Regulators
The LX8384/84A/84B Series ICs are available and specified in the Available
positive regulators designed to provide 5A Options table below.
output current. These regulators yield The LX8384/84A/84B Series devices are
higher efficiency than currently available pin-compatible with earlier 3-terminal
devices with all internal circuitry designed regulators, such as the 117 series products,
to operate down to a 1V input-to-output but they do require input and output
differential. In each of these products, the capacitors. A minimum 10µF capacitor is
dropout voltage is fully specified as a required on the input and a 15µF or greater
function of load current. Dropout is on the output of these new devices for
guaranteed at a maximum of 1.3V (8384A) stability. Although, these capacitors are
and 1.5V (8384) at maximum output generally included in most regulator
current, decreasing at lower load currents. designs.
In addition, on-chip trimming adjusts the The LX8384/84A/84B Series quiescent
reference voltage tolerance to 1% maximum current flows into the load, thereby
at room temperature and 2% maximum over increasing efficiency. This feature contrasts
the 0 to 125°C range for the LX8384A, with PNP regulators where up to 10% of the
making this ideal for the Pentium P54C- output current is wasted as quiescent
VRE specification. The LX8384B offers current. The LX8384-xxI is specified over
0.8% tolerance at room temperature and the industrial temperature range of -25°C to
1.0% maximum over line, load and 125°C, while the LX8384-xxC/84A-
temperature. Fixed versions are also xxC/84B-xxC is specified over the
commercial range of 0°C to 125°C.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Three-Terminal Adjustable Or
Guaranteed < 1.3V Headroom a
Guaranteed 2.0% Max.
Reference Tolerance (LX8384A)
Guaranteed 1.0% Max.
Reference Tolerance (LX8384B)
0.015% Line Regulation
0.15% Load Regulation
Pentium® Processor VRE
High Efficiency Linear
Power Regulators For Switching
Constant Current Regulators
Table 1 - Available Options
* Capacitors must have < 20mΩ
Total ESR for the VRE Specification
An Application of the LX8384A for the Pentium P54C Processors Meeting VRE Specification.
Max Ref Max Dropout
Accuracy Voltage DT (D-Pak) 3-Pin
0 to 125
-25 to 125
Copyright © 2000
Rev. 2.1d, 2001-03-15
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX8384-xxCPT)
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570