TPS3514

TPS3514 www.ti.com SLVS422C – JUNE 2002 – REVISED DECEMBER 2006 PC POWER-SUPPLY SUPERVISORS FEATURES Over-Voltage Protection and Lockout: 12V, 5V, and 3.3V Supplies Over-Current Protection and Lockout: 12V, 5V, and 3.3V Supplies Under-Voltage Protection and Lockout: 12V Supplies Under-Voltage Detect: 5V and 3.3V Supplies Fault-Protection Output with Open-Drain Output Stage Open-Drain, Power-Good Output Signal: Monitors Power-Good Signal Input 3.3V and 5V Supplies 300ms Power-Good Delay 75ms Delay: 5V, 3.3V Power-Supply Short-Circuit Turn-On Protection 2.3ms PSON Control To FPO Turn-Off Delay 38ms PSON Control Debounce Wide Supply Voltage Range: 4.5V to 15V DESCRIPTION The TPS3514 is a PC switching power-supply system monitor with minimum external components. It provides under-voltage lockout (UVLO), over-voltage (OV), under-voltage (UV), over-current (OC) protection circuits, power-good indicator, and on/off control. UVLO thresholds are 4.45V (on) and 3.65V (off). Over-current protection (OCP) and over-voltage protection (OVP) monitor 3.3V, 5V, and 12V supplies. When an OC or OV condition is detected, the power-good output (PGO) is asserted low and the fault protection output (FPO) is latched high. PSON from low-to-high resets the latch. The OCP function will be enabled 75ms after PSON goes LOW with PGI HIGH and a debounce of typically 38ms. A built-in 2.3ms delay with 38ms debounce from PSON to FPO output is enabled at turn-off. An external resistor...