• 简体中文
• English

LTC3828 - Dual, 2-Phase Step-Down Controller with Tracking

The LTC3828 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 550kHz.  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 compensation 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 compatible with a wide 4.5V to 28V (30V maximum) input supply range, encompassing 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 dissipationduring short-circuit conditions.  Reverse current and current foldback functions are disabled during soft-start.

Features Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise Tracking for Both Outputs Constant Frequency Current Mode Control Wide VIN Range: 4.5V to 28V Operation Power Good Output Voltage Indicator Adjustable Soft-Start Current Ramping Foldback Output Current Limiting- Disabled at Start-Up No Reverse Current During 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 260kHz to 550kHz OPTI-LOOP® Compensation Minimizes COUT Very Low Dropout Operation: 99% Duty Cycle Output Overvoltage Protection Small 28-Lead SSOP and 5mm × 5mm QFN Packages Typical Application

Applications Telecom Infrastructure ASIC Power Supply Industry Equipment Packaging

Order Information

Demo Boards

Companion Boards