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PDF SC1476 Data sheet ( Hoja de datos )
| Número de pieza | SC1476 | |
| Descripción | Portable IMVP-IV Dual Phase Power Supply Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC1476 (archivo pdf) en la parte inferior de esta página. Total 1 Páginas | ||
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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 [email protected]
+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
1 page | ||
| Páginas | Total 1 Páginas | |
| PDF Descargar | [ Datasheet SC1476.PDF ] | |
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