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PDF SC4508 Data sheet ( Hoja de datos )
| Número de pieza | SC4508 | |
| Descripción | Buck or Buck-Boost Current Mode Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC4508 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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SC4508
Buck or Buck-Boost(Inverting)
Current Mode Controller
POWER MANAGEMENT
Description
The SC4508 is a low voltage current mode switching regu-
lator controller that drives a P-channel power MOSFET
with programmable switching frequency. It can be con-
figured in either buck or buck boost (inverting) convert-
ers. The converters can be operated from 2.7V to 15V
input voltage range. The typical operating supply current
is 3mA and a shutdown pin allows the user to turn the
controller off reducing it to less than 200µA. The output
www.DatavSohelteat4gUe.cocman adjusted by external resistor divider. The
switching frequency is programmable up to 1.5MHz,
allowing small inductor and capacitor values to minimize
PCB space. The operating current level is programmable
via an external sense resistor. Accessible reference volt-
age allows users to make output voltage as low as they
want.
Typical Application Circuits
Features
Wide input voltage range 2.7V to 15V
Programmable output voltage
Programmable switching frequency up to 1.5MHz
Buck or buck boost(inverting) configuration
Current mode control with slope compensation
Very low quiescent current in shutdown mode
Accessible reference voltage
MLPQ-12 package
Applications
Low power point of use converters
Single or multiple output low power converters
Positive and/or negative output voltage
DSL cards
Graphic cards
I/O cards
Negative bias supplies
Vin Vin
VREF
VDD
FB+
FB-
COMP
SC4508
CS
OUT
SS/SHDN GND OSC
VREF
VDD
FB+
FB-
COMP
SC4508
CS
OUT
SS/SHDN GND OSC
Revision: November 30, 2004
1
www.semtech.com
1 page  
POWER MANAGEMENT
Block Diagram
www.DataSheet4U.com
SC4508
Marking Information
Top View
yyww = Date Code (Example: 0012)
2004 Semtech Corp.
5
www.semtech.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SC4508.PDF ] | |
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