LT8638SJV#PBF

LT8638SJV#PBF is a synchronous step-down regulator that features second-generation silent switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. It includes the integration of input 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 LT8638S 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 a fast transient response. Applications include automotive and industrial supplies, general purpose step-down.

• Silent Switcher®2 architecture, ultralow EMI emissions on any PCB
• Eliminates PCB layout sensitivity, internal bypass capacitors reduce radiated EMI
• Wide input voltage range from 2.8V to 42V, fast transient response with external compensation
• Output soft-start and power good, safely tolerates high reverse current
• PolyPhase® operation: up to 12 phases, reference accuracy: ±1% over temperature
• Minimum on-time is 25ns typical at (ILOAD = 3A, FCM)
• Oscillator frequency is 200KHz typical at (RT = 226K)
• VIN quiescent current in shutdown is 6µA typical at (VEN/UV = 0V, VIN = 12V, TA = 25°C)
• Top power NMOS on-resistance is 20mohm typical at (ISW = 1A, TA = 25°C)
• Operating junction temperature range from -40°C to 150°C, 28-lead LQFN package

Notes

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