SC451 Semtech, SC451 Datasheet
SC451
Manufacturer Part Number
SC451
Description
Single Phase Power Supply Controller
Manufacturer
Semtech
Datasheet
1.SC451.pdf
(1 pages)
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DataSheet4U.com
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DataSheet
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
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 SC451 operates from 5Vdc and also features soft-start,
an open-drain PWRGD signal with power-good blanking,
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.
February 2, 2005
POWER MANAGEMENT
Description
Conceptual Application Circuit
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U
.com
V ID (5 :0 )
V ID L o g ic
a n d D A C
V
C C A
S C 4 5 1 S in g le P h a s e
IM V P -IV /IM V P -IV +
P o w e r S u p p ly
V
5
DataSheet4U.com
Single Phase Power Supply Controller
C o n tro lle r
S m a rt
D rive r
P W M
1
Portable IMVP-IV™ and IMVP-IV+™
PowerStep IV™ is a trademark of Semtech
Corporation.
Other trademarks or registered trademarks may be
claimed as the property of others.
Features
Applications
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
Programmable DeeperSleep voltage
Under-voltage lock out on VccA
Over-voltage protection on CORE
Current limit protection on CORE
Thermal protection
Powergood flag with blanking during VID or
DeeperSleep mode changes
Automatic powersave at light load
TSSOP-28, TSSOP-38 and MLP 6X6-28 package
options
Low power Notebook and Laptop computers
Embedded Applications
V IN
0 .7 0 0 V -1 .7 0 8 V
V C O R E
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SC451
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