The SC900 adds the flexibility of I²C bus control so designers can quickly modify up to five common use, low dropout regulator requirements often present in battery-operated designs.  Critical operational parameters can be changed or reset without replacing individual ULDOs or interface circuitry.  These parameters include reset logic, power good indication, output voltage and active shutdown. 

Designers will find the SC900 ideal for cellular phones, PDAs, personal media players, palmtop/laptop computers, and similar portable equipment.  In these battery-powered devices it is essential that performance be maintained as the battery voltage slowly declines.  This product delivers full performance on all five ULDOs over the input range of 2.7V to 5.5V.  All five ULDOs are I²C programmable in 50mV increments from 1.45V to 3.00V with an accuracy of ±3 percent, and each LDO can be independently enabled/disabled.

Output noise is 45µV (RMS), power supply rejection ratio is 60dB at 50mA, and current drawn in sleep mode is approximately 215uA for all five ULDOs in total operation.
Device PCB footprint is approximately 4mm x 4mm assuring that the SC900 will make multi-ULDO layout more straightforward.

"The SC900’s I²C interface allows for last minute adjustments to the five key power parameters to optimize system performance.  Hardware designers can also focus on cost reduction via integration rather than individual device selection and qualification" says C.S. Mitter, Semtech's Director of Power Management for Handheld Products.

The SC900 provides protection circuitry that prevents the device from operating in an unspecified state.  These include undervoltage lockout protection, over-temperature protection, and short circuit protection.

Key Features of the SC900 

• Independent I²C control of all five ULDO output voltages - 1.45V to 3.00V in 50mV increments for each ULDO
• Output voltage accuracy for each of the five regulators is within ±3.5% over the full input voltage range of 2.7V to 5.5V and across the full ambient temperature range of -40°C to +85°C.
• Independent I²C active shutdown/power good control of each ULDO
• Over-temperature, short circuit, thermal protection and undervoltage lockout protection
• Typical 50mV dropout voltage per ULDO at 50mA operation
• Small input/output filter capacitors
• Small 4mm x 4mm, lead-free and RoHS compliant 20-lead MLPQ package