LTC Intros New LTC3770 Step-Down DC-DC Controller

Linear Technology Corp. (LTC, Milpitas, CA) introduced its new LTC3770, a synchronous, step-down, dc-dc controller with fast transient response, high output accuracy, integrated tracking and sequencing functions, and output margining capability. The LTC3770's constant on-time, valley current-mode architecture, combined with a low minimum on-time of 50 nsec typical, allows the control loop to respond instantly to load steps.

The LTC3770 uses current-mode control and can operate without a sense resistor by sensing the voltage drop across the synchronous power MOSFET. The LTC3770 is capable of operating at low duty cycles; outputs as low as 0.6 V can be supplied from input voltages as high as 32 V. The LTC3770 output-voltage accuracy is specified at ±0.5% at room temperature and ±0.67% from 0 °C to 85 °C.

The LTC3770 is offered in two packages of 5 mm x 5 mm QFN and 28-lead SSOP. It is rated for operation from -40 °C to +85 °C.