Features: 1.25V to 5V VOUT at 7A
VPOWERDropout < 0.35V @ 7A
VCONTROLDropout < 1.10V @7A
1.5% Trimmed Reference
Fast Transient Response
Remote Voltage Sensing
Thermal Shutdown
Current Limit
Short Circuit Protection
Drop-In Replacement for LT1580
Backwards Compatible with 3-pin RegulatorsSpecificationsVPOWERInput Voltage...........................................................................................................6V
VCONTROLInput Voltage......................................................................................................13V
Operating Junction Temperature Range.......................................................0°C TJ150°C
Storage Temperature Range.......................................................................-65°C to +150°C
Lead Temperature Soldering
Wave Solder (through hole styles only)............................................10 sec. max, 260°C peak
Reflow (SMD styles only)....................................................... max above 183°C, 230°C peak
ESD Damage Threshold........................................................................................................2kVDescriptionThis new very low dropout regula-tor is designed to power the next generation of advanced micropro-cessors. To achieve very low dropout, the internal pass transistor is powered separately from the con-trol 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 CS5257A-1 the dropout is determined by the mini-mum control voltage.
CS5257A-1 is supplied in five-terminal TO-220 and D2PAK packages, allowing for the implementation of a remote-sense pin permitting very accurate regulation of output volt-age directly at the load, where it counts, rather than at the regulator. This remote sensing feature virtual-ly eliminates output voltage varia-tions due to load changes and resis-tive voltage drops. Typical load regulation measured at the sense pin is 1mV for an output voltage of 2.5V with a load step of 10mA to 7A.
The very fast transient loop response easily meets the needs of the latest microprocessors. In addi-tion, a small capacitor CS5257A-1 on the Adjust pin will further improve the tran-sient capabilities.
Internal protection circuitry pro-vides for "bust-proof" operation, similar to three-terminal regulators.This circuitry, CS5257A-1, which includes over-current, short circuit, supply sequencing and overtemperature protection will self protect the regu-lator under all fault conditions.
The CS5257A-1 is ideal for generat-ing a secondary 2-2.5V low voltage supply on a motherboard where both 5V and 3.3V are already avail-able.
CS5257A-1 Data Sheet
