42V, 15A Synchronous Step-Down Silent Switcher 2

The LT®8648S/LT8648SP 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 input and boost 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 LT8648S/ LT8648SP 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 25ns minimum on-time allows high step down ratios even at high switching frequencies. External compensation via the VC pin allows for fast transient response at high switching frequencies. The VC pin also enables current sharing and a CLKOUT pin enables synchronizing other regulators to the LT8648S/ LT8648SP.

Burst Mode operation enables low 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.

The LT8648SP package features an exposed back for heat sink attachment, which can be used to significantly improve thermal performance.

APPLICATIONS

* Automotive and Industrial Supplies

* General Purpose Step-Down

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Silent Switcher®2 Architecture

* Ultralow EMI 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 95.5% Efficiency at 1MHz, 12VIN to 5VOUT

* Up to 93% Efficiency at 2MHz, 12VIN to 5VOUT

* Wide Input Voltage Range: 3V to 42V

* 15A Output Current

* Low Quiescent Current Burst Mode® Operation

* 100μA IQ Regulating 12VIN to 5VOUT

* Output Ripple < 10mVP-P