The LTC3828EG 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 dissipation during short-circuit conditions. Reverse current and current foldback functions are disabled during soft-start.
Feature
- 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
Applications
- Telecom Infrastructure
- ASIC Power Supply
- Industry Equipment
(Picture: Pinout)
