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參數(shù)資料
| 型號： | SC1474 |
| 廠商： | Semtech Corporation |
| 英文描述： | Portable Pentium Dual Phase Power Supply Controller |
| 中文描述： | 便攜式奔騰雙三相電源控制器 |
| 文件頁數(shù)： | 1/1頁 |
| 文件大?。?/td> | 121K |
| 代理商： | SC1474 |
1
www.semtech.com
SC1474
Portable Pentium
Dual Phase
Power Supply Controller
POWER MANAGEMENT
Description
The SC1474 PowerStep III IC is a single chip high-per-
formance Hysteretic PWM controller. With dual integrated
Smart Drivers, it powers advanced Pentium 4 pro-
cessors. The SC1474 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 requirements for
even longer battery life. The SC1474 automatically de-
tects performance and battery mode VIDs. In addition, it
integrates direct “deeper sleep” mode support. All op-
erating modes incorporate automatic “power-save” to
prevent negative current flow in the low-side FET during
light loading conditions, saving even more power.
Revision 6, December 2002
Features
IMVP3 compliant single chip solution
High speed Dual phase hysteretic controller
VID programmable output
Dual integrated 2A/4A drivers
Integrated VID regulator controller
Automatic performance/battery mode detection
Dynamic phase current matching
Under-voltage lock out on all Vcc inputs
Over-voltage protection on CORE
Current Limit protection on CORE
Thermal protection
Programmable soft-start
Powergood flag with blanking during VID changes
Automatic powersave at light load
TSSOP-38 package
Industrial temperature range
Applications
Typical Application Circuit
A 5-bit DAC, accurate to 0.85%, sets the output voltage
reference, and implements the 0.600V to 1.750V range
required by the processor. The hysteretic converter uses
a comparator without an error amplifier, and so provides
the fastest possible transient response, while avoiding
the stability issues inherent to classical PWM controllers.
The SC1474 incorporates a controller for V_VID and au-
tomatically provides the proper sequencing.
The SC1474 operates from +3.3Vdc Vcca and dual 5V
DC drive inputs. It also features soft-start, an open-drain
PWRGD signal with power-good blanking, and an enable
input. Programmable current limiting latches the SC1474
off after 32 current limit pulses. It comes in a space-
saving TSSOP-38 package.
Advanced Intel microprocessors
CONTROLLER
VID [4:0]
Lo
+VCORE
+V_IN
+V_5
Up to 40A
Logic
Controller
Signals
Driver
Multiplexer
Lo
Co
Driver
Rcs
Rcs
+V_3
+V_VID
Controller
SC1474
Dual Phase
Extended IMVP
0.600V-1.75V
Extended
IMVP
Power
Control
Smart
VID
Smart
VID
Regulator
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC1474TS-TR | 制造商:Semtech Corporation 功能描述: |
| SC1474TSTRT | 制造商:Semtech Corporation 功能描述:DC DC Cntrlr Dual-OUT PWM DC to DC Controller 3.3V/5V Input 38-Pin TSSOP T/R 制造商:Semtech Corporation 功能描述:Controller IC Leaded Process Compatible: 制造商:Semtech Corporation 功能描述:SC Series SMT Portable Pentium Dual Phase Power Supply Controller - TSSOP-38 |
| SC1476 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Portable IMVP-IV Dual Phase Power Supply Controller |
| SC1476ITS.TR | 制造商:Semtech Corporation 功能描述: |
| SC1476ITS.TRT | 制造商:SEMTECH 功能描述:I.C. |
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