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參數資料
| 型號： | SC4508ABUCKEVB |
| 廠商： | Semtech Corporation |
| 英文描述： | Buck or Buck-Boost (Inverting) Current Mode Controller |
| 中文描述： | 降壓或降壓升壓（反相）電流模式控制器 |
| 文件頁數： | 1/21頁 |
| 文件大小： | 430K |
| 代理商： | SC4508ABUCKEVB |
POWER MANAGEMENT
Description
The SC4508A is a low voltage current mode switching
regulator controller that drives a P-channel power
MOSFET with programmable switching frequency. It can
be configured in either buck or buck boost (inverting) con-
verters. 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 200
μ
A.
The output voltage can adjusted by external resistor di-
vider. The switching frequency is programmable up to
1.5MHz, allowing small inductor and capacitor values to
minimize PCB space. The operating current level is pro-
grammable via an external sense resistor. Accessible ref-
erence voltage allows users to make output voltage as
low as they want.
1
www.semtech.com
SC4508A
Buck or Buck-Boost (Inverting)
Current Mode Controller
Revision: July 25, 2007
Features
Typical Application Circuits
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
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
Hiccup mode after 32 cycle-by-cycle OCP
4mm x 4mm MLPQ-12 lead free package. This
product is fully WEEE and RoHS compliant
GND
COMP
SS/EN
OSC
FB+
FB-
CS
OUT
V+
VREF
SC4508A
Vin
Vout
Vout
VREF
CS
OUT
V+
FB+
FB-
COMP
SS/EN
OSC
SC4508A
GND
Vin
相關PDF資料 |
PDF描述 |
|---|---|
| SC4508AMLTRT | Buck or Buck-Boost (Inverting) Current Mode Controller |
| SC4508 | Buck or Buck-Boost(Inverting) Current Mode Controller |
| SC4508IMLTRT | Buck or Buck-Boost(Inverting) Current Mode Controller |
| SC4509 | Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2 |
| SC4509EVB | Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SC4508AMLTRT | 功能描述:IC REG CTRLR BST INV PWM 12-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 特色產品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數:1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| SC4508IMLTRT | 制造商:Semtech Corporation 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
| SC4509 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2 |
| SC4509EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2 |
| SC4509SK.TRT | 制造商:SEMTECH 功能描述:I.C. |
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