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參數(shù)資料
| 型號： | SC191 |
| 廠商： | Semtech Corporation |
| 英文描述： | Low Supply Ripple Synchronous Buck Conversion Regulator |
| 中文描述： | 低電源紋波同步降壓轉(zhuǎn)換穩(wěn)壓器 |
| 文件頁數(shù)： | 1/13頁 |
| 文件大小： | 409K |
| 代理商： | SC191 |
www.semtech.com
1
POWER MANAGEMENT
Description
SC191
Low Supply Ripple Synchronous
Buck Conversion Regulator
April 12, 2006
Features
Typical Application Circuit
Applications
The SC191 is a synchronous step-down converter with
integrated power devices and an integrated front-end
LDO regulator to minimize input supply ripple. If supply
ripple is not a concern, the front-end LDO regulator can be
bypassed externally to maximize ef
fi
ciency.
The internal MOSFET switches provide peak current greater
than 550mA to achieve a DC output of at least 330mA over
the rated input voltage range, making the SC191 ideal for
single-cell Li-ion battery applications as well as
fi
xed 3.3V
and 5V
fi
xed input applications. The output is a
fi
xed 1.2V
- ideal for low-voltage microprocessors. Other voltage
options are available (consult the factory for details).
Additional features include internal soft-start to limit in-
rush current, over-current protection, over-temperature
protection, and over-voltage protection.
The 1MHz switching frequency allows the use of small
surface mount capacitors and inductors, and no other
external compensation components are needed. The
device is available in a low pro
fi
le (0.8mm max height)
2.3mm x 2.3mm MLPD 8-lead package, minimizing area
without compromising performance.
Less than 1mV Supply Ripple
2.7V to 5.5V Input Range
330mA Guaranteed Output Current
Fixed Frequency 1MHz Operation
No Schottky Diode Required
Over-Current Protection
Over-Voltage Protection
Over-Temperature Protection
Soft-Start
No External Compensation Required
MLPD-8, 2.3mm x 2.3mm Package
WEEE and RoHS Compliant
Cell Phones
Cordless Phones
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
WLAN Peripherals
Wireless Modules
1 Li-Ion or 3 NiMH/NiCd Powered Devices
SC191
L
4.7
μ
H
C
IN
4.7
μ
F
VIN
VOUT
BP
GND
LX
PVIN
PGND
C
BP
4.7
μ
F
EN
V
OUT
C
OUT
4.7
μ
F
V
IN
1
5
8
6
3
4
2
7
Patent Pending
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC191AEVB | Low Supply Ripple Synchronous Buck Conversion Regulator |
| SC191AWLTRT | Low Supply Ripple Synchronous Buck Conversion Regulator |
| SC192 | Synchronous Buck Converter with Integrated Power Devices |
| SC192IMLTRT | Synchronous Buck Converter with Integrated Power Devices |
| SC192EVB | Synchronous Buck Converter with Integrated Power Devices |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC19-1 | 制造商:Thomas & Betts 功能描述:U CABLE CLIP - 6 MM 制造商:Belden Inc 功能描述: |
| SC191AEVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Supply Ripple Synchronous Buck Conversion Regulator |
| SC191AWL.TRT | 制造商:SEMTECH 功能描述:I.C. |
| SC191AWLTRT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Supply Ripple Synchronous Buck Conversion Regulator |
| SC192 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Synchronous Buck Converter with Integrated Power Devices |
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