LTC3828 Datasheet | Linear Technology

Features n Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise n Tracking for Both Outputs n Constant Frequency Current Mode Control n Wide VIN Range: 4.5V to 28V Operation n Power Good Output Voltage Indicator n Adjustable Soft-Start Current Ramping n Foldback Output Current Limiting- Disabled at Start-Up n No Reverse Current During Soft-Start Interval n Clock Output for 3-, 4-, 6-Phase Operation n Dual N-Channel MOSFET Synchronous Drive n ±1% Output Voltage Accuracy n Phase-Lockable Fixed Frequency 260k Hz to 550k Hz n OPTI-LOOP® pensation Minimizes COUT n Very Low Dropout Operation: 99% Duty Cycle n Output Overvoltage Protection n Small 28-Lead SSOP and 5mm × 5mm QFN Packages APPLICATIONS n Tele Infrastructure n ASIC Power Supply n Industry Equipment Dual, 2-Phase Step-Down Controller with Tracking DESCRIPTION The LTC®3828 is a dual high performance step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows for a phase-lockable frequency of up to 550k Hz. The TRCKSS pin provides both soft-start and tracking functions. Multiple LTC3828s can be daisy-chained in applications requiring more than two voltages to be tracked. OPTI-LOOP pensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference and power good output indicator are patible with a wide 4.5V to 28V (30V maximum) input supply range, enpassing all battery chemistries. The RUN pins control their respective channels independently. The FCB/PLLIN pin selects among Burst Mode® operation, skip-cycle mode and continuous current mode. Current foldback limits MOSFET dissipation during shortcircuit conditions. Reverse current and current foldback functions are disabled during soft-start. L, LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology...