SCT2451.pdf
No.12725
? Wide Input Range: 3.8V-36V
? Up to 5A Continuous Output Current
? 0.8V ±1% Feedback Reference Voltage
? Integrated 45mΩ High-Side and 20mΩ Low-Side
Power MOSFETs
? Pulse Skipping Mode PSM with 25uA Quiescent
Current in Sleep Mode
? 100ns Minimum On-time
? Programmable Soft-start Time
? Fixed Switching Frequency 570kHz
? Frequency Spread Spectrum FSS Modulation for
EMI Reduction
? Precision Enable Threshold for Programmable
Input Voltage Lock Out (UVLO) Threshold and
Hysteresis
? Low Dropout Mode Operation
? Derivable Inverting Voltage Regulator
? Over-voltage and Over Temperature Protection
? Available in an ESOP-8 Package
The SCT2451 is 5A synchronous buck converters with
wide input voltage, ranging from 3.8V to 36V, which
integrates a 45mΩ high-side MOSFET and a 20mΩ
low-side MOSFET. The SCT2451, adopting the peak
current mode control, supports the Pulse Skipping
Modulation (PSM) with typical 25uA low quiescent
current which assists the converter on achieving high
efficiency at light load or standby condition.
The SCT2451 features programmable soft start time
with 570kHz switching frequency. The converter allows
power conversion from high input voltage to low output
voltage with a minimum 100ns on-time of high-side
MOSFET. It also supports Low Drop-Out LDO
operation at low voltage difference from input to output
condition.
The SCT2451 is an Electromagnetic Interference (EMI)
friendly buck converter with implementing optimized
design for EMI reduction. The SCT2451 features
Frequency Spread Spectrum FSS with ±6% jittering
span of the 570kHz switching frequency and
modulation rate 1/512 of switching frequency to reduce
the conducted EMI.
The SCT2451 offers cycle-by-cycle current limit and
hiccup over current protection, thermal shutdown
protection, output over-voltage protection and input
voltage under-voltage protection. The device is
available in an 8-pin thermally enhanced SOP-8
package.
