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The LX8587/87A Series ICs are positive regulators designed to provide 3A output current. Pentium® Processor and Power PC™ applications requiring fast transient response are ideally suited for this product family.
The LX8587A is guaranteed to have <1.2 dropout at 3A and the LX8587 < 1.3V at the same current, making them ideal to provide well-regulated outputs of 2.5V to 3.6V using a 5V input supply. Fixed versions are also available and specified in the Available Options table below.
Current limit is trimmed about 3.1A to ensure adequate output current and controlled short-circuit current. On-chip thermal limiting provides protection against any combination of overload conditions that would create excessive junction temperatures.
The LX8587/87A family of products are available in the TO-220 through hole, the TO-263 surface-mount, and the TO-252 surface-mount packages. For higher current applications see the LX8585 and the LX8584 data sheets.
LX8587 Maximum Ratings
Power Dissipation ......................................................................................................... Internally Limited Input Voltage ................................................................................................................ 10V Input to Output Voltage Differential............................................................................... 10V Maximum Output Current............................................................................................... 5A Maximum Operating Junction Temperature ................................................................... 150°C Storage Temperature Range.......................................................................................... -65°C to 150°C Peak Package Solder Reflow Temp. (40 seconds max. exposure) ................................. 260°C (+0,-5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal.
LX8587 Features
Three-Terminal Adjustable Or Fixed Output Guaranteed 1.2V Headroom At 3A (LX8587A) Guaranteed < 1.3V Headroom At 3A (LX8587) Output Current of 3A Fast Transient Response 1% Voltage Reference Initial Accuracy Output Short Circuit Protection Built-In Thermal Shutdown
LX8587 Typical Application
Pentium Processor Supplies Power PC Supplies Microprocessor Supplies Low Voltage Logic Supplies Post Regulator for Switching Supply ASIC & Low Voltage Chipset Supplies Graphics & Sound Cards Processor I/O Supply