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SC453EVB Datasheet

  • SC453EVB

  • Portable, VID Programmed Single Phase Power Supply Controlle...

  • 23頁

  • SEMTECH   SEMTECH

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Portable, VID Programmed Single
Phase Power Supply Controller
POWER MANAGEMENT
Description
The SC453 IC is a single chip high-performance Hysteretic
PWM controller. With its integrated SmartDriver鈩? it pow-
ers advanced graphics and core processors. It provides
sleep mode and boot voltage support. Automatic "power-
save" is present to prevent negative current flow in the
low-side FET during light loading conditions saving even
more power. The high side driver initially turns on with a
weak drive to reduce ringing, EMI, and capacitive turn-on
of the low side.
A 6-bit DAC, accurate to 0.85%, sets the output voltage
reference, and implements the 0.700V to 1.708V range
required by the processor. The hysteretic converter uses a
comparator without an error amplifier, and therefore pro-
vides the fastest possible transient response, while avoid-
ing the stability issues inherent to classical PWM control-
lers. The DAC is externally slew rate limited to minimize
transient currents and audible noise.
The SC453 operates from 5VDC and also features soft-
start, an open-drain PWRGD signal with power good blank-
ing, and an enable input. Programmable current limiting
shuts down the SC453 after 32 current limit pulses.
SC453
Features
High Speed Hysteretic Controller
Single Phase Operation
Selectable Analog or VID Controlled Sleep Setting
6 Bit VID programmable Output
Integrated Drivers with Soft-High Side Turn-On
Programmable Soft-Start
Programmable Boot Voltage
Programmable Sleep Voltage with Sleep Mode
Under-Voltage Lockout on VCCA
Over-voltage Protection on CORE
Current Limit Protection on CORE
Thermal Protection
Power Good Flag with Blanking During
V
CORE
Changes
Automatic Power Save at Light Load
TSSOP-28 Package
Applications
Low Power Notebook and Laptop Computers
Embedded Applications
PowerStep IV鈩?and Smart Driver鈩?are trademarks
of Semtech Corporation.
Typical Application Circuit
V
5
V
CCA
VCORE
0.700V-1.708V
VIN
Smart
Driver
PWM
Controller
SC453 Single Phase
Power Supply
VID (5:0)
VID Logic
and DAC
August 25, 2006
1
www.semtech.com

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