Supply Controller. SC451 Datasheet

SC451 Controller. Datasheet pdf. Equivalent

Part SC451
Description Single Phase Power Supply Controller
Feature www.DataSheet4U.com Portable IMVP-IV™ and IMVP-IV+™ Single Phase Power Supply Controller POWER MANA.
Manufacture Semtech
Datasheet
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SC451
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SC451
Portable IMVP-IV™ and IMVP-IV+™
Single Phase Power Supply Controller
POWER MANAGEMENT
Description
Features
The SC451 PowerStep IV™ IC is a single chip high-perfor-
mance Hysteretic PWM controller. With its integrated
SmartDriver™, it powers advanced IMVP-IV™ and IMVP4+™
processors. The SC451 features extended Intel Mobile Volt-
age Positioning (IMVP™) to increase battery life by reduc-
ing the voltage at the processor when it is heavily loaded.
It directly supports Intel’s SpeedStep® processors for even
longer battery life. The SC451 fully supports the Intel®
Geyserville-III core voltage specification. It provides direct
“deeper 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
‹ IMVP-IV™ and IMVP-IV+™ compliant single chip
solution
‹ On chip CLK_ENABLE# and IMVP4_PWRGD outputs
‹ Backward compatible with SC1479
‹ High speed hysteretic controller
‹ Single phase operation
‹ Selectable analog or VID controlled DeeperSleep
setting
‹ 6 bit VID programmable output
‹ Integrated drivers with soft high side turn-on
‹ Programmable softstart
‹ Programmable boot voltage
weak drive to reduce ringing, EMI, and capacitive turn-on ‹ Programmable DeeperSleep voltage
of the low side.
‹ Under-voltage lock out on VccA
‹ Over-voltage protection on CORE
A 6-bit DAC, accurate to 0.85%, sets the output voltage ‹ Current limit protection on CORE
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Applications
DataShee
The SC451 operates from 5Vdc and also features soft-start, ‹ Low power Notebook and Laptop computers
an open-drain PWRGD signal with power-good blanking, ‹ Embedded Applications
and an enable input. Programmable current limiting shuts
down the SC451 after 32 current limit pulses. In addition,
it comes in a space-saving MLP 6X6-28 and TSSOP-28
package. TSSOP-38 package is also available which pro-
vides a pin to pin upgrade to a dual phase solution using
Semtech’s dual phase controller SC450.
PowerStep IV™ is a trademark of Semtech
Corporation.
Other trademarks or registered trademarks may be
claimed as the property of others.
Conceptual Application Circuit
VCCA
V5
Sm art
Driver
V IN
VCORE
0.700V -1.708V
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V ID (5:0)
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SC 451 Single P hase
IM VP-IV/IM VP-IV+
Pow er Supply
PWM
Contro ller
V ID Logic
and DAC
1
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