LT8643SIV#PBF

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1. DESCRIPTION

The LT8643SIV#PBF synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes the integration of bypass capacitors to optimize all the fast current loops inside and make it easy to achieve advertised EMI performance by reducing layout sensitivity. This performance makes the LT8643SIV#PBF ideal for noise-sensitive applications and environments. Peak current mode control with a 30ns minimum on-time allows high step-down ratios even at high switching frequencies. The LT8643SIV#PBF has external compensation to enable current sharing and fast transient response at high switching frequencies. Burst Mode operation enables ultralow standby current consumption, forced continuous mode can control frequency harmonics across the entire output load range, or spread spectrum operation can further reduce EMI emissions. 

2. FEATURES

    1. Silent Switcher ®2 Architecture

        - Ultralow EMI Emissions on Any PCB

        - Eliminates PCB Layout Sensitivity

        - Internal Bypass Capacitors Reduce Radiated EMI

        - Optional Spread Spectrum Modulation 

    2. High Efficiency at High Frequency

        - Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT

        - Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT

    3. Wide Input Voltage Range: 3.4V to 42V

    4. 6A Maximum Continuous, 7A Peak Output

    5. Ultralow Quiescent Current Burst Mode® Operation

        - 2.5µA IQ Regulating 12VIN to 3.3VOUT (LT8640S)

        - Output Ripple < 10mVP-P

    6. External Compensation: Fast Transient Response and Current Sharing (LT8643S)

    7. Fast Minimum Switch On-Time: 30ns

    8. Low Dropout Under All Conditions: 100mV at 1A

    9. Forced Continuous Mode

  10. Adjustable and Synchronizable: 200kHz to 3MHz

  11. Output Soft-Start and Tracking

  12. Small 24-Lead 4mm × 4mm LQFN Package

  13. AEC-Q100 Qualified for Automotive Applications

3. APPLICATIONS

    1. Automotive and Industrial Supplies

    2. General Purpose Step-Down