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SC1406G Datasheet(PDF) 1 Page - Semtech Corporation

Part No. SC1406G
Description  Power Supply Controller for Portable Pentium II & III SpeedStep Processors
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Maker  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
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SC1406G Datasheet(HTML) 1 Page - Semtech Corporation

 
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POWER MANAGEMENT
SC1406G
Power Supply Controller for Portable
Pentium ® II & III SpeedStep™ Processors
SC1406G
Power Supply Controller for Portable
Pentium ® II & III SpeedStep™ Processors
Description
Features
Conceptual Application Circuit
Applications
Revision 8/3/2000
The SC1406G PowerStep™ controller is a High Speed,
High Performance Hysteretic Mode PWM controller.
Teamed with the SC1405 Smart™ Driver, it powers ad-
vanced Pentium® II and Pentium® III processors. The
SC1406G features Intel Mobile Voltage Positioning
(IMVP), which increases battery life by reducing the volt-
age at the processor when it is heavily loaded. It also
directly supports Intel’s SpeedStep™ processors for even
longer battery life.
A 5-bit DAC, accurate to 0.85%, sets the output voltage
reference, and implements the 0.925V to 2.00V range
of the mobile Pentium® specifications. The hysteretic
converter uses a comparator without an error amplifier,
and therefore provides the fastest possible transient
response, while avoiding the stability issues inherent to
classical PWM controllers.
Two linear regulator controllers, coupled with appropri-
ate external transistors, produce tightly regulated 1.5V
and 2.5V to complete the processor power solution.
The SC1406G also features separate soft-start con-
trols for the converter and the regulators, a TTL-
compatible power good indication, logic enable, and
low battery undervoltage lockout. Programmable
current limiting uses a separate comparator to protect
against overloads and short-circuits.
u High-speed hysteretic controller provides high effi
ciency over a wide operating load range
u Inherently stable
u Complete CPU power solution with two LDO drivers
u Programmable core voltage for Pentium® II & III pro
cessors
u Native Speed Step® support
u Laptop and notebook computers
u High performance microprocessor-based systems
u High efficiency distributed power supplies
SC1406G
IMVP
CONTROLLER
SC1406G
IMVP
CONTROLLER
VID [4:0]
VID [4:0]
SC1405
Smart
MOSFET
Driver
SC1405
Smart
MOSFET
Driver
Lo
+VCC_CPU_CORE
+VCC_CPU_CORE
Co
3.3V
+VCC_CPU_IO
+VCC_CPU_IO
+VCC_CPU_CLK
+VCC_CPU_CLK
1.5V
2.5A
2.5V
150mA
+V_IN
+V_5
3.3V
0.925V-2.0V
Up to 14A
LDO
Controller
LDO
Controller
PWM
Controller
SC1406G
IMVP
CONTROLLER
SC1406G
IMVP
CONTROLLER
VID [4:0]
VID [4:0]
SC1405
Smart
MOSFET
Driver
SC1405
Smart
MOSFET
Driver
Lo
+VCC_CPU_CORE
+VCC_CPU_CORE
Co
3.3V
+VCC_CPU_IO
+VCC_CPU_IO
+VCC_CPU_CLK
+VCC_CPU_CLK
1.5V
2.5A
2.5V
150mA
+V_IN
+V_5
3.3V
0.925V-2.0V
Up to 14A
LDO
Controller
LDO
Controller
PWM
Controller


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