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SC454_09 Datasheet, PDF (1/1 Pages) Semtech Corporation – Single-Phase Single Chip IMVP-6/6+ Vcore Power Supply | |||
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POWER MANAGEMENT
Description
The SC454 is a single-phase chip, high-performance PWM
controller designed to power advanced IMVP-6 and IMVP6+
⢠processors. On-chip support is provided for all of the
IMVP-6/6+ requirements, including Active Voltage Position-
ing, Geyserville-3 VID transitions, VID-Controlled Deeper
Sleep voltage setting, PSI#, DPRSTP#, DPRSLP Control,
Fast and Slow C4 Exit, and default Boot Voltage.
The SC454 implements hysteretic control technology which
provides the fastest possible transient response while
avoiding the stability issues inherent to classical PWM
controllers. Eliminating the sense resistors reduces costs
and PCB area, plus increases system efÃciency. Integrated
SmartDriver⢠technology initially turns on the high-side
driver with âsoftâ drive to reduce ringing, EMI, and capaci-
tive turn-on of the low side MOSFET, while also increasing
overall efÃciency.
Hysteretic operation adaptively reduces the SC454 switch-
ing frequency at light loads. Combined with an automatic
âpower-saveâ mode which prevents negative current Ãow in
the low-side FET, system efÃciency is signiÃcantly enhanced
during light loading conditions.
A 7-bit DAC, accurate to 0.85%, sets the output voltage
reference, and implements the 0.300V to 1.500V range
required by the processor. The DAC slew rate is externally
programmed to minimize transient currents and audible
noise. True differential remote sensing provides accurate
point-of-load regulation at the processor die. Other features
include programmable soft-start, open-drain IMVP-6/6+
PWRGD and CLKEN# outputs, dynamic current sharing,
over-voltage and programmable over-current protection.
The SC454 is available in a space-saving 32-pin MLP
package.
SC454
Single-Phase Single Chip
IMVP-6/6+ Vcore Power Supply
Features
 Single-Phase Solution with Integrated Drivers
 Hysteretic Control for Fast Transient Response
 VR_TT Support
 Active Voltage Positioning
 True Differential Remote (die) Sensing
 On-Chip Support for all IMVP-6/6+ Power
Management Features
 VID Programmed Deeper Sleep Voltage
 Fast/Slow C4E Break Event Support
 Clock Enable (CLKEN#) Output
 Delayed Power Good Signal with Blanking
 Programmable Soft-Start and DAC Slew Control
 Programmable OCP Threshold
 Supports all Ceramic Decoupling Solutions
 32-pin MLP (5x5)
 Latched Over-Voltage Protection
Applications
 IMVP-6/6+ Notebook PCs
 Embedded Applications
Sept 17, 2009
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www.semtech.com
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