Semtech Corporation SC2446ITSTRT

Description
The SC2446 is a dual-phase synchronous step-down switching power supply controller. It operates in synchronous continuous-conduction mode and provides out-of-phase high-current output gate drives to N-channel MOSFET power stages. The SC2446 employs fixed frequency peak current-mode control for ease of frequency compensation and fast transient response.

Features
2-Phase synchronous continuous conduction mode for high efficiency step-down converters
Out of phase operation for low input current ripples
Output source and sink currents
Fixed frequency peak current-mode control
75mV/-110mV maximum current sense voltage
Synthesized MOSFET RS(ON) current-sensing for low-cost applications
Optional resistor current-sensing for precise current-limit
Dual outputs or 2-phase single output operation
Excellent current sharing between individual phases
Wide input voltage range: 4.7V to 16V
Individual soft-start, overload shutdown, and enable
Duty cycle up to 88%
0.5V feedback voltage for low-voltage outputs
External reference input for DDR applications
Buffered V/2 output
Programmable frequency up to 1 MHz per phase
External synchronization
Industrial temperature range
28-lead TSSOP-EDP package

Applications
Telecommunication power supplies
DDR memory power supplies
Graphic power supplies
Servers and base stations