LTC Intros LTC2921/LTC2922 Power Controllers

Linear Technology Corp. (LTC, Milpitas, CA) introduced its new LTC2921 and LTC2922 power supply tracking controllers for up to five, high-current supplies. Tracking ensures that multiple supplies ramp-up at the same time and at the same rate protecting ASICs, processors and other circuitry from lock-up or more severe damage.

The input monitors ensure the supply integrity of five supplies (LTC2921) or five supplies (LTC2922) before ramping up the supplies. The devices utilize n-channel MOSFETs to ensure that supplies track. Following successful ramp-up, remote-sense switches allow the regulators to close the loop around the MOSFETs and compensate for the voltage drop. A circuit breaker monitors the primary supply for over-current faults. The LTC2921 and LTC2922 include a power-good output capable of driving another MOSFET and allowing sequencing of another supply.

The LTC2921 with five input monitors and three remote-sense switches is available in the narrow SSOP-16 package. Pricing begins at $3.15 each in 1,000-piece quantities. The LTC2922 with five input monitors and five remote-sense switches is available in the SSOP-20 package. Pricing begins at $3.40 each in 1,000-piece quantities.