DESCRIPTION

· The LTC3828 is a dual high-performance step-down switching regulator controller designed to drive all N-channel synchronous power MOSFET stages.
· It features a constant frequency current mode architecture with a phase-lockable frequency of up to 550kHz.
· The TRCKSS pin provides soft-start and tracking functions, allowing multiple LTC3828s to be daisy-chained for applications requiring more than two tracked voltages.
· OPTI-LOOP compensation optimizes transient response across a wide range of output capacitance and ESR values.
· It operates with a wide input supply range of 4.5V to 28V (30V max) and includes a precision 0.8V reference and power good output indicator.

FEATURES

· Dual, 180° phased controllers reduce required input capacitance and power supply-induced noise.
· Tracking for both outputs ensures synchronized voltage regulation.
· Constant frequency current mode control enhances stability.
· Wide VIN range: 4.5V to 28V operation supports various battery chemistries.
· Power good output voltage indicator for system monitoring.
· Adjustable soft-start current ramping and foldback output current limiting, disabled at start-up.
· No reverse current during the soft-start interval.
· Clock output for 3-, 4-, 6-phase operation.
· Dual N-channel MOSFET synchronous drive.
· ±1% output voltage accuracy.
· Phase-lockable fixed frequency from 260kHz to 550kHz.
· OPTI-LOOP compensation minimizes COUT requirements.
· Very low dropout operation: 99% duty cycle.
· Output overvoltage protection.
· Available in small 28-Lead SSOP and 5mm × 5mm QFN packages.

APPLICATIONS

· High-efficiency dual 2.5V/3.3V step-down converter with tracking.
· Telecom infrastructure power systems.
· ASIC power supply solutions.
· Industrial equipment power management.