SCT9325.pdf
No.12887
? EMI Reduction with Switching Node Ringing-free
? 3.8V-32V Wide Input Voltage Range
? Up to 2A Continuous Output Load Current
? 5V ±1% Output Voltage
? Fully Integrated 130mΩ Rdson High-side
MOSFETand 70mΩ Rdson Low-side MOSFET
? 1uA Shut-down Current
? 20uA Ultra Low Quiescent Current
? 500KHz Switching Frequency with ±6%Frequency
Spread Spectrum FSS Modulation
? 80ns Minimum On-time
? Precision Enable Threshold for
ProgrammableUVLO Threshold and Hysteresis
? Low Drop-Out LDO Operation
? Pulse Skipping Modulation PSM in Light Load
? 4ms Built-in Soft-start Time
? Thermal Shutdown Protection at 160°C
? Available in SOP-8L Package
The SCT9325 are 2A, 500KHz, synchronous buck converters with up to 32V wide input voltage range, which fully integrates a 130mΩ high-side MOSFET and a 70mΩ low-side MOSFET to provide high efficiency step-down DCDC conversion. The SCT9325 adopt peak current mode control with the integrated compensation network and the output feedback resistors network, which make the device easily to be used by minimizing the off-chip component counts. The SCT9325 support the Pulse Skipping Modulation (PSM) with typical 20uA Ultra-Low Quiescent and achieved 80% efficiency at 1mA and 85% at 5mA light load conditions.
The SCT9325 are Electromagnetic Interference (EMI) friendly buck converters. The SCT9325 feature Frequency Spread Spectrum (FSS) with ±6% jittering span of the 500KHz switching frequency and modulation rate 1/512 of switching frequency to reduce the conducted EMI. The converter has proprietary designed gate driver scheme to resist switching node high frequency ringing without sacrificing MOSFET turn on and turn off time, which further erases high frequency radiation EMI noise caused by the MOSFETs hard switching. When the converter enters PSM mode, the artificial switching node anti-ringing circuit is specially designed to address the radiation EMI noise in the light load condition.
The SCT9325 offers output over-voltage protection, cycle-by-cycle peak current limit, and thermal shutdown protection. The device is available in a low-profile SOP-8L package.
