Analog Devices' LT8640 and LT8643 synchronous step-down regulators feature second-generation Silent Switcher architecture, designed to minimize EMI/EMC 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 easier to achieve advertised EMI performance by reducing layout sensitivity. This performance makes the LT8640 and LT8643 ideal for noise-sensitive applications and environments.
The fast, clean, low-overshoot switching edges enable high-efficiency operation even at high switching frequencies, leading to a small overall solution size. Peak current mode control with a 30 ns minimum on-time allows high step-down ratios, even 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/EMC emissions. Soft-start and tracking functionality is accessed via the TR/SS pin, and an accurate input voltage UVLO threshold can be set using the EN/UV pin. A CLKOUT pin enables the synchronized of other regulators to the LT8640 and LT8643.
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- Silent Switcher 2 architecture
- Ultralow EMI/EMC emissions on any PCB
- Eliminates PCB layout sensitivity
- Internal bypass capacitors reduce radiated EMI
- Optional spread spectrum modulation
- High efficiency at high frequency
- Up to 96% efficiency at 1 MHz, 12 VIN to 5 VOUT
- Up to 95% efficiency at 2 MHz, 12 VIN to 5 VOUT
- Wide input voltage range: 3.4 V to 42 V
- 6 A maximum continuous output, 7 A peak output
Applications
- Automotive and industrial supplies
- General purpose step-down
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- Ultra-low quiescent Current Burst Mode® operation
- 2.5 μA IQ regulating 12 VIN to 3.3 VOUT
- Output ripple < 10 mVP-P
- Fast minimum switch on-time: 30 ns
- Low dropout under all conditions: 100 mV at 1 A
- Forced continuous mode
- Safely tolerates inductor saturation in overload
- Adjustable and synchronizable: 200 kHz to 3 MHz
- Output soft-start and tracking
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Analog Devices' LT8640 and LT8643 synchronous step-down regulators feature second-generation Silent Switcher architecture, designed to minimize EMI/EMC 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 easier to achieve advertised EMI performance by reducing layout sensitivity. This performance makes the LT8640 and LT8643 ideal for noise-sensitive applications and environments.
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