LX8384B-xx

Features:

THREE-TERMINAL ADJUSTABLE OR FIXED OUTPUT
GUARANTEED < 1.3V HEADROOM AT 5A (LX8384A-xx)
GUARANTEED 2.0% MAX. REFERENCE TOLERANCE (LX8384A-xx)
GUARANTEED 1.0% MAX. REFERENCE TOLERANCE (LX8384B-xx)
OUTPUT CURRENT OF 5A MINIMUM
  0.015% LINE REGULATION
  0.15% LOAD REGULATION


Application

PENTIUM^® PROCESSOR VRE APPLICATIONS
HIGH EFFICIENCY LINEAR REGULATORS
POST REGULATORS FOR SWITCHING POWER SUPPLIES
BATTERY CHARGERS
CONSTANT CURRENT REGULATORS
CYRIX^® 6x86^TM
AMD-K5^TM


Pinout




Specifications

Power Dissipation ................................................................................. Internally Limited
Input Voltage.............................................................................................................. 10V
Input to Output Voltage Differential ........................................................................... 10V
Operating Junction Temperature
  Hermetic (K - Package) ........................................................................................ 150°C
  Plastic (DD - Package) .......................................................................................... 150°C
Storage Temperature Range ................................................................. -65°C to 150°C
Lead Temperature (Soldering, 10 seconds) .......................................................... 300°C


Description

The LX8384/84A/LX8384B-xx Series ICs are positive regulators designed to provide 5A 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 (8384A) and 1.5V (8384) at maximum output current, decreasing at lower load currents.

In addition, LX8384B-xx on-chip trimming adjusts the reference voltage tolerance to 1% maximum at room temperature and 2% maximum over the 0 to 125°C range for the LX8384A, making this ideal for the Pentium P54C-VRE specification.The LX8384B 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 LX8384/84A/LX8384B-xx Series devices are pin-compatible with earlier 3-terminal regulators, such as the 117 series products. While a 10F output capacitor is required on both input and output of these new devices, this capacitor is generally included in most regulator designs.

The LX8384/84A/LX8384B-xx Series quiescent current flows into the load, thereby increasing efficiency. This feature constrasts with PNP regulators where up to 10% of the output current is wasted as quiescent current. The LX8384-xxI is specified over the industrial temperature range of -25°C to 125°C, while the LX8384-xxC/84A-xxC/84B-xxC i s specified over the commercial range of 0°C to 125°C.