SCT9323.pdf
No.12886
? EMI Reduction with Switching Node Ringing-free
? 3.8V-32V Wide Input Voltage Range
? Up to 2A Continuous Output Load Current
? 3.3V ±1% Output Voltage
? Fully Integrated 130mΩ Rdson High-side MOSFET
and 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 Programmable
UVLO 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 SCT9323 is 2A, 500KHz, synchronous buck
converter 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
SCT9323 adopts 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 SCT9323 supports 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 SCT9323 is Electromagnetic Interference (EMI)
friendly buck converter. The SCT9323 features
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 SCT9323 offers output over-voltage protection,
cycle-by-cycle peak current limit, and thermal
shutdown protection. The device is available in a lowprofile
SOP-8L package.
