Linear Technology Corp. (LTC, Milpitas, CA) introduced the new LTC3802, a wide-input-voltage range, dual two-phase, dc-dc synchronous controller for converting a high input voltage to low output voltages at a high switching frequency. This is accomplished with a leading-edge modulation architecture that allows low duty cycles without compromising the operating switching frequency. Applications include point-of-load power supplies for sub 1 V, 1.x V, 2.x V and 3.x V in embedded systems, access switch routers, compact PCI and servers.
With a fast nominal 550 kHz switching frequency that is phase-lockable from 300 kHz to 750 kHz, the LTC3802 uses lower-value, small-size inductors and capacitors for regulating output voltages as low as 0.6 V. The LTC3802's two-phase operation reduces the peak input current ripple, which in turn minimizes the number of input capacitors. For precision power-up and power-down sequencing of multiple supply rails, the IC features programmable up/down tracking with ratiometric and coincident options.
The LTC3802 is offered in 28-lead SSOP and 5 mm x 5 mm QFN packages. It is rated for operation from -40 °C to +85 °C. Pricing for 1,000-piece quantities starts at 4.80 each.
