CS5253-1

Features:

· 1.25V to 5V VOUT at 3A
· VPOWER Dropout < 0.40V @ 3A
· VCONTROL Dropout < 1.05V @ 3A
· 1% Trimmed Reference
· Fast Transient Response
· Remote Voltage Sensing
· Thermal Shutdown
· Current Limit
· Short Circuit Protection
· Drop-In Replacement for emtech EZ1582
· Backwards Compatible with 3-pin Regulators


Pinout




Specifications

VPOWER Input Voltage........................................................................................... . 6V
VCONTROL Input Voltage....................................................................................... 13V
Operating Junction Temperature Range .................................... 0 ² TJ ² 150Storage
Temperature Range .......................................................................... . -65 to +150
Lead Temperature Soldering
    Reflow (SMD styles only) ................................ 60 sec. max above 183, 230 peak
ESD Damage Threshold............................................................................................2kV


Description

This new very low dropout regulator is designed to power the next generation of advanced microprocessors. To achieve very low dropout, the internal pass transistor is powered separately from the control circuitry. Furthermore, with the control and power inputs tied together, this device can be used in single supply configuration and still offer a better dropout voltage than conventional PNP-NPN based LDO regulators. In this mode CS5253-1 the dropout is determined by the minimum control voltage.

CS5253-1 is supplied in a five-terminal D2PAK package, which allows for the implementation of a remotesense pin permitting very accurate regulation of output voltage directly at the load, where it counts, rather than at the regulator. This remote sensing feature virtually eliminates output voltage variations due to load changes and resistive voltage drops. Typical load regulation measured at the sense pin is less than 1mV for an output voltage of 2.5V with a load step of 10mA to 3A.

The very fast transient loop response easily meets the needs of the latest microprocessors. In addition, a small capacitor CS5253-1 on the Adjust pin will further improve the transient capabilities.

Internal protection circuitry provides for Òbust-proofÓ operation, similar to three-terminal regulators. This circuitry, which includes overcurrent, short circuit, and over-temperature protection will self protect the regulator under all fault conditions. The CS5253-1 is ideal for generating a secondary 2-2.5V low voltage supply on a motherboard where both 5V and 3.3V are already available.