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參數(shù)資料
| 型號： | SC471A |
| 廠商： | Semtech Corporation |
| 英文描述： | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| 中文描述： | 同步降壓控制器具有多層次VOUT電源支持過渡 |
| 文件頁數(shù)： | 1/27頁 |
| 文件大小： | 634K |
| 代理商： | SC471A |
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POWER MANAGEMENT
Description
1
www.semtech.com
SC471/SC471A
Synchronous Buck Controller with
Multi-Level VOUT
Transition Support
Features
Applications
Notebook/Sub-Notebook Graphics Voltage
Controllers
Tablet PCs
Embedded Applications
V
OUT
Programmable 0.75V to 5.25V with Integrated
Transition Support
V
BAT
Range 3V to 25V
Soft Shutoff at Output
Current Sense Using Low-side R
DS(ON)
or Resistor
Sensing
Adjustable Cycle-by-Cycle Valley Current Limit
325kHz Fixed-Frequency
Constant On-Time for Fast Dynamic Response and
Reduced Output Capacitance
Automatic Smart Power Save
Internal Soft-Start
Over-Voltage/Under-Voltage Fault Protection
Power Good Output with Transition Blanking
1
μ
A Typical Shutdown Current
500
μ
A Typical Operating Current
Tiny 3
×
3mm, 16 Pin MLPQ Package
Low External Part Count
Industrial Temperature Range
0.85% Internal Reference
1A/3A Non-Overlapping Gate Drive with
SmartDriver Technology
High Ef
fi
ciency > 90%
This Product is Fully WEEE and RoHS Compliant
Patent Pending
September 12, 2006
The SC471/A is a versatile, constant on-time synchronous
buck, pseudo-
fi
xed-frequency, PWM controller intended for
notebook computers and other battery operated portable
devices. The SC471/A contains all the features needed to
provide cost-effective control of system elements needing
voltage slewing. Two integrated switches provide four
resistor-programmable DC output voltages, controlled by
the G0 and G1 inputs.
The output voltage is adjustable from 0.75V to 5V.
Additional features for each output include cycle-by-cycle
current limit, voltage soft-start, under-voltage protection,
programmable over-current protection, soft shutdown,
automatic power save and non-overlapping gate drive.
The SC471/A provides an enable input and a power good
output which is automatically blanked during output
voltage transitions.
The constant on-time topology provides fast dynamic
response. The excellent transient response means that
SC471/A based solutions require less output capacitance
than competing
fi
xed-frequency converters. Switching
frequency is constant until a step in load or line voltage
occurs, at which time the pulse density and frequency
will increase or decrease to counter the change in
output voltage. After the transient event, the controller
frequency returns to steady state operation. At light loads,
the automatic power save mode reduces the SC471/A
frequency for improved ef
fi
ciency.
相關PDF資料 |
PDF描述 |
|---|---|
| SC471AMLTRT | Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC472B | Single-Phase Single Chip Graphics Core Power Supply |
| SC473 | Single-Phase Single Chip Graphics Core Power Supply |
| SC473EVB | Single-Phase Single Chip Graphics Core Power Supply |
| SC473MLTRT | Single-Phase Single Chip Graphics Core Power Supply |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SC471AEVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471AMLTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC471EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
| SC-471-H | 制造商:PREMO 制造商全稱:PREMO CORPORATION S.L 功能描述:Common mode chokes with Ferrite cores-SMD format |
| SC471MLTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Controller with Multi-Level VOUT Transition Support |
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