ST1534A Datasheet | STMicroelectronics

DESCRIPTION The ST1534A is intended for application such as power managed PCI and network interface cards (NICs), where operations from 3.3V VAUX supply SCHEMATIC DIAGRAM VIN may be required when the 5V supply has been shut down. During regular operation, 3.3V power for the PCI card is provided by the internal LDO regulator, generated from 5V supply. When the 5V VAUX is available, the IC connects this supply directly to its output using an external P-Channel FET. This ensures an uninterrupted 3.3V out even if VIN falls out of specification. When both supplies are available simultaneously, the drive pin DR will be pulled high, turning off the PMOS switch. The device is available in the popular 5 leads P2PAK and PPAK + 5V Detect Rpull_down Reference + - Error Amp VOUT GND April 2003 1/15 ABSOLUTE MAXIMUM RATINGS Symbol VI VSHDN IO Tstg Top DC Input Voltage Shutdown Input Voltage Output Current Storage Temperature Range Operating Junction Temperature Range Parameter² Value -0.3 to 7 -0.3 to 7 Internally limited -40 to +125 0 to +85 Unit V V m A °C °C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. THERMAL DATA Symbol Rthj-case Rthj-amb Parameter Thermal Resistance Junction-case Thermal Resistance Junction-ambient PPAK 8 100 P2PAK 3 50 SO-8 20 55 Unit °C/W °C/W CONNECTION DIAGRAM (top view) P2PAK PPAK SO-8 PIN DESCRIPTION Pin PPAK/P2PAK 1 2 3 4 5 Pin SO/8 1 2 5, 6, 7, 8 3 4 Symbol AUX IN GND OUT DR Name and Function Auxiliary Input port typically 3.3V Input port typically 5V Ground LDO 3.3V Output Port Drive Output for external P-Channel MOSFET pass element ORDERING INFORMATION TYPE ST1534A PPAK (- ) ST1534APT P2PAK (#) ST1534AP2T SO-8 (- ) ST1534AD (- ) PPAK and SO-8 are available in Tape & Reel with the suffix "-TR". (#) P2PAK is available in Tape & Reel with the suffix "-R". 2/15 TYPICAL APPLICATION CIRCUIT 3.3V 0.1...