LTC2925 Datasheet | Linear Technology

Features s s s s s LTC2925 Multiple Power Supply Tracking Controller with Power Good Timeout DESCRIPTIO .. s s s s s s U APPLICATIO S s s s s Flexible Power Supply Tracking Up and Down Power Supply Sequencing Supply Stability Is Not Affected Controls Three Supplies Without Series FETs Controls an Optional Fourth Supply With a Series FET Electronic Circuit Breaker Remote Sense Switch pensates for Voltage Drop Across a Series FET Supply Shutdown Outputs FAULT Output Adjustable Power Good Timeout Available in Narrow 24-Lead SSOP and Tiny 24-Lead QFN Packages The LTC®2925 provides a simple solution to power supply tracking and sequencing requirements. By selecting a few resistors, the supplies can be configured to ramp-up and ramp-down together or with voltage offsets, time delays or different ramp rates. The LTC2925 controls the outputs of three independent supplies without inserting any pass element losses. For systems that require a fourth supply, or when a supply does not allow direct access to its feedback resistors, one supply can be controlled with a series FET. When the FET is used, an internal remote sense switch pensates for the voltage drop across the FET and current sense resistor, and an electronic circuit breaker provides protection from short-circuit conditions. The LTC2925 also includes a power good timeout feature that turns off the supplies if an external supply monitor fails to indicate that the supplies have entered regulation within an adjustable time-out period. , LTC and LT are registered trademarks of Linear Technology Corporation. VCORE and VI/O Supply Tracking Microprocessor, DSP and FPGA Supplies Servers munication Systems TYPICAL APPLICATIO S 3.3V VIN 0.015Ω 0.1µF 10Ω 0.1µF SUPPLY MONITOR 154k 100k SD1 REMOTE VIN 10k STATUS VIN LTC2925 10k FAULT RAMPBUF 1.65k TRACK1 13k 88.7k TRACK2 41.2k 86.6k TRACK3 100k GND SCTMR 0.47µF SDTMR 0.082µF PGTMR 0.82µF 100k 2925 TA01 Si4412ADY MASTER 1V/DIV VCC ON SENSEP...