LTC3646-1_15 Datasheet, PDF (10/28 Pages) Linear Technology – 40V, 1A Synchronous Step-Down Converter

LTC3646/LTC3646-1
OPERATION
SVIN/PVIN Overvoltage Protection
In order to protect the internal power MOSFET devices
against transient voltage spikes, the LTC3646 continuously
monitors the SVIN pin for an overvoltage condition. When
SVIN rises above V_IN(OV), the regulator suspends opera-
tion by shutting off both power MOSFETs and resetting
the soft-start level. Once V_IN drops to below the specified
range of V_IN(OV), the regulator immediately restarts normal
operation.
Short-Circuit Protection
The LTC3646 is designed to withstand output short circuits.
In this situation the part will source I_LIM (approximately
1.2A) plus half the inductor current ripple. Since V_OUT is
at or near 0V, the on-time will shorten and the off-time
will lengthen considerably, resulting in a lower switching
frequency.
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