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參數資料
| 型號： | SC475AEVB |
| 廠商： | Semtech Corporation |
| 英文描述： | Synchronous Buck Controller with Dual-Level VOUT Transition Support |
| 中文描述： | 同步降壓控制器與雙級VOUT電源支持過渡 |
| 文件頁數： | 1/27頁 |
| 文件大?。?/td> | 603K |
| 代理商： | SC475AEVB |
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POWER MANAGEMENT
Description
1
www.semtech.com
SC475A
Synchronous Buck Controller with
Dual-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 MLP 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%
Device is Fully WEEE and RoHS Compliant
Patent Pending
September 25, 2006
The SC475A 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 SC475A contains all the features needed to
provide cost-effective control of system elements needing
voltage slewing. An integrated switch provides two resistor-
programmable DC output voltages controlled by the G0
input.
The output voltage is adjustable from 0.75V to 5V.
Additional features 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 SC475A
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
SC475A 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 SC475A
frequency for improved ef
fi
ciency.
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相關代理商/技術參數 |
參數描述 |
|---|---|
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