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PDF SC1476 Datasheet ( Hoja de datos )

Número de pieza SC1476
Descripción Portable IMVP-IV Dual Phase Power Supply Controller
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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SC1476 Hoja de datos, Descripción, Manual
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POWER MANAGEMENT
Description
The SC1476 PowerStep™ IV IC is a single chip high-per-
formance hysteretic PWM controller. With its integrated
SmartDriver™, it powers advanced IMVP-IV processors.
The SC1476 features extended Intel® Mobile Voltage Po-
sitioning (IMVP) to increase battery life by reducing the
voltage at the processor when it is heavily loaded. It
directly supports Intel® SpeedStep™ processors for even
longer battery life. The SC1476 fully supports Intel’s
Geyserville-III core voltage specification. It provides di-
rect “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 con-
ditions, saving even more power. The high side driver ini-
tially 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 thereby provid-
ing 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 SC1476 operates from 3Vdc and 5Vdc and also fea-
tures soft-start, an open-drain PWRGD signal with power-
good blanking, and an enable input. Programmable cur-
rent limiting shuts down the SC1476 after 32 current
limit pulses. In addition, it comes in a space-saving
TSSOP-38 package.
Typical Application Circuit
SC1476
Portable IMVP-IV Dual Phase
Power Supply Controller
Features
‹ IMVP-IV compliant single chip solution
‹ High speed hysteretic controller
‹ 6 bit VID programmable output
‹ Integrated drivers with soft high side turn-on
‹ Programmable softstart
‹ Programmable boot voltage
‹ Programmable DeeperSleep voltage
‹ Dynamic phase current matching
‹ Under-voltage lockout 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
‹ Slew rate limited DAC
‹ TSSOP-38 package
Applications
‹ Notebook and Laptop computers
Requests for a complete datasheet and
additional product information should be
directed to sales@semtech.com
+V_5
+V_IN
Power
Control
Signals
Exte nded
IMVP
Logic
Smart
Driver
PWM
Controller
Lo Rcs
+VCORE
0.600V-1.75V
Up to 40A
VVIIDD[[54::00]]
+V_3
+V_VID
SC1474
Dual Phase
Extended IMVP
CONTROLLER
VID
Multiple xer
Smart
Driver
VID
Regula tor
Controller
Lo Rcs
Co
Revision 7, December 2002
1
www.semtech.com

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