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SC1406GCTSTR Datasheet

  • SC1406GCTSTR

  • Power Supply Controller for Portable Pentium II & III SpeedS...

  • 557.83KB

  • 28頁

  • SEMTECH   SEMTECH

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Power Supply Controller for Portable
Pentium
廬
II & III SpeedStep
聶
Processors
POWER MANAGEMENT
Description
The SC1406G PowerStep聶 controller is a High Speed,
High Performance Hysteretic Mode PWM controller.
Teamed with the SC1405 Smart聶 Driver, it powers ad-
vanced Pentium廬 II and Pentium廬 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聮s SpeedStep聶 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廬 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.
SC1406G
Features
u
High-speed hysteretic controller provides high effi
u
u
u
u
ciency over a wide operating load range
Inherently stable
Complete CPU power solution with two LDO drivers
Programmable core voltage for Pentium
廬
II & III pro
cessors
Native Speed Step
廬
support
Applications
u
Laptop and notebook computers
u
High performance microprocessor-based systems
u
High efficiency distributed power supplies
Conceptual Application Circuit
+V_5
+V_IN
PWM
Controller
SC1405
SC1405
Smart
Smart
MOSFET
MOSFET
Driver
Driver
Lo
+VCC_CPU_CORE
+VCC_CPU_CORE
Co
0.925V-2.0V
Up to 14A
IMVP
IMVP
CONTROLLER
CONTROLLER
SC1406G
SC1406G
3.3V
1.5V
2.5A
+VCC_CPU_IO
+VCC_CPU_IO
VID [4:0]
VID [4:0]
LDO
Controller
3.3V
2.5V
150mA
+VCC_CPU_CLK
+VCC_CPU_CLK
LDO
Controller
Revision 8/3/2000
1
www.semtech.com

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