参数资料
| 型号： | SC458IMLTRT |
| 厂商： | Semtech |
| 文件页数： | 1/1页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM 44-MLP |
| 标准包装： | 1 |
| 输出数： | 2 |
| 电源电压： | 3 V ~ 28 V |
| 封装/外壳： | 44-MLP |
| 包装： | 标准包装 |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC458IMLDKR |
SC458
NOT RECOMMENDED FOR NEW DESIGN
Complete Dual-Phase Low VOUT
Power Supply Controller
POWER MANAGEMENT
Description
The SC458 is a single chip high-performance PWM
controller designed to power advanced processors. On-
chip support is provided for Active Voltage Positioning, “VID
on-the- ? y” transitions, single and dual phase control.
The SC458 implements hysteretic control technology
which provides the fastest possible transient response
while avoiding the stability issues inherent to classical
PWM controllers. Semtech’s proprietary Combi-Sense ?
technology provides a loss-less current sensing scheme
which is extremely robust and easy to lay out. Eliminating
the sense resistors reduces costs and PCB area, plus
increases system ef ? ciency. Integrated SmartDriver?
technology initially turns on the high side driver with ‘soft’
drive to reduce ringing, EMI, and capacitive turn-on of the
low side MOSFET, while also increasing overall ef ? ciency.
Hysteretic operation adaptively reduces the SC458
switching frequency at light loads. Combined with an
automatic “power-save” mode which prevents negative
current ? ow in the low-side FET, system ef ? ciency is
signi ? cantly enhanced during light loading conditions.
The SC458 changes from dual-phase to single-phase
operation whenever DUAL transitions low, providing
optimal ef ? ciency across the entire power range. A
second low power control pin, DRIFT, allows the output
voltage to be discharged by the load during a negative
voltage transition.
A 7-bit DAC, accurate to 0.85%, sets the output voltage
reference, and implements a 0.300V to 1.500V range.
The DAC slew rate is externally programmed to minimize
transient currents and audible noise. True differential
remote sensing provides accurate point-of-load regulation
at the processor die. Other features include programmable
soft-start, dual (delayed, and not delayed) power good
outputs, dynamic current sharing, over voltage and
programmable over current protection. The SC458 is
available in a space- saving 44 pin MLP package.
Features
Dual-Phase Solution with Integrated Drivers
Hysteretic Control for Fast Transient Response
Combi-Sense Loss-Less Current Sensing
Dynamic Current Sharing
Active Voltage Positioning
True Differential Remote Sensing
Dual Power Good Outputs
Programmable Soft-Start and DAC Slew Control
Programmable OCP Threshold
Supports all Ceramic Decoupling Solutions
44 pin MLP (7x7 mm)
Product is WEEE and RoHS Compliant
Applications
Graphics and other Processor Cores
Notebook PCs
Embedded Applications
October 31, 2006
1
United States Patents: 6,504,422, 6,794,926
www.semtech.com
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相关代理商/技术参数 |
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| SC4595TSKTRT | 制造商:Semtech Corporation 功能描述: |
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