SC457MLTRT Datasheet, PDF (1/1 Pages) Semtech Corporation – Single-Phase Single Chip Vcore Power Supply

NOT RECOMMENDED FOR NEW DESIGN
SC457
POWER MANAGEMENT
Single-Phase Single Chip
Vcore Power Supply
Description
Features
The SC457 is a single phase, high performance PWM con-
Single-Phase Solution with Integrated Drivers
troller designed to power advanced processors. On-chip
support is provided for VID on-the-fly transitions and active
voltage positioning.
Hysteretic Control for Fast Transient Response
Active Voltage Positioning
True Differential Remote (die) Sensing
The SC457 implements hysteretic control technology
providing the fastest possible transient response while
avoiding the stability issues inherent to classical PWM
controllers. Eliminating the sense resistors reduces costs
On-Chip Support for all Power Management
Features
Programmable Soft-Start and DAC Slew Control
Programmable OCP Threshold
and PCB area while increasing system efficiency. Integrated
Supports all Ceramic Decoupling Solutions
SmartDriver™ technology initially turns on the high-side
driver with soft drive to reduce ringing, EMI, and capacitive
D _{turn-on of the low side MOSFET, while increasing overall}
E efficiency.
32-Pin MLP (5x5) - product is WEEE and RoHS
compliant
Default 1.2V Boot Voltage
Soft OFF State
D _{Hysteretic operation adaptively reduces the SC457 switch-}
N ^N _{ing frequency at light loads. Combined with an automatic}
E _{IG power-save mode which prevents negative current flow in}
the low-side FET, system efficiency is significantly enhanced
M _{S during light loading conditions.}
OM ^{DE A 7-bit DAC, accurate to 0.85%, sets the output voltage}
reference and implements the 0.300V to 1.500V range
C _{required by the processor. The DAC slew rate is externally}
E ^W _{programmed to minimize transient currents and audible}
R ^{E noise. True differential remote sensing provides accurate}
N _{point-of-load regulation at the processor die. Other features}
T _{include programmable soft-start, open-drain PG_DEL and}
O ^{R PG# outputs, dynamic current sharing, over-voltage and}
N ^{O programmable over-current protection. The SC457 is avail-}
F ^{able in a space-saving 32-pin MLP package.}
Applications
Notebook PCs
Embedded Applications
Graphics and other Processor Cores
April 12, 2006
1
www.semtech.com