• 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.