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NCP1508

更新时间： 2024-11-23 04:37:55
品牌 Logo 应用领域
安森美 - ONSEMI 转换器
页数 文件大小 规格书
15页 405K
描述
Up to 500 mA, 1 MHz, High Efficiency Synchronous Step−Down DC−DC Converter in DFN Package

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NCP1508 数据手册

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NCP1508  
Up to 500 mA, 1 MHz, High  
Efficiency Synchronous  
Step−Down DC−DC  
Converter in DFN Package  
http://onsemi.com  
The NCP1508 step−down PWM DC−DC converter is optimized  
for portable applications powered from 1−cell Li−ion or 3 cell  
Alkaline/NiCd/NiMH batteries. This DC−DC converter utilizes a  
current−mode control architecture for easy compensation and better  
line regulation. It also uses synchronous rectification to increase  
efficiency and reduce external part count. The NCP1508 optimizes  
efficiency in light load conditions when switched from a normal  
PWM mode to a “pulsed switching” mode. The device also has a  
built−in 1 MHz (nominal) oscillator for the PWM circuitry, or it can  
be synchronized to an external 500 kHz to 1000 kHz clock signal.  
Finally, it includes an integrated soft−start, cycle−by−cycle current  
limiting, and thermal shutdown protection. The NCP1508 is  
available in a space saving, low profile 3x3 mm 10 pin DFN package.  
MARKING  
DIAGRAM  
1
10 PIN DFN  
MN SUFFIX  
CASE 485C  
1508  
ALYW  
1
1508 = Specific Device Code  
A
L
Y
W
= Assembly Location  
= Wafer Lot  
= Year  
= Work Week  
Features  
• High Efficiency:  
93% for 1.89 V Output at 3.6 V Input and 125 mA Load Current  
91% for 1.89 V Output at 3.6 V Input and 300 mA Load Current  
ORDERING INFORMATION  
Device  
Package  
Shipping†  
3000 Tape & Reel  
• Digital Programmable Output Voltages: 1.0, 1.3, 1.5 or 1.89 V  
• Output Current up to 500 mA at V = 3.6 V  
in  
NCP1508MNR2  
10 Pin DFN  
• Low Quiescent Current of 14 mA in Pulsed Switching Mode  
• Low 0.2 mA Shutdown Current  
NCP1508MNR2G 10 Pin DFN 3000 Tape & Reel  
(Pb−Free)  
• −30°C to 85°C Operation Temperature  
• Low Profile DFN Package  
• Pb−Free Package is Available  
†For information on tape and reel specifications,  
including part orientation and tape sizes, please  
refer to our Tape and Reel Packaging Specifications  
Brochure, BRD8011/D.  
Application  
• Cellular Phones, Smart Phones and PDAs  
• Digital Still Cameras  
• MP3 Players and Portable Audio Systems  
100  
• Wireless and DSL Modems  
90  
• Portable Equipment  
80  
Pulsed Mode  
PWM Mode  
6.8 mH  
70  
60  
50  
40  
30  
20  
10  
V
5
4
3
6
in  
VCC  
LX  
V
out  
2.7 V − 5.2 V  
C
in  
VCCP  
C
out  
22 mH  
10 mH  
FB  
9
SHD  
8
7
CB1  
CB0 and CB1  
Control Input  
10  
SYNC CB0  
V
in  
= 3.6 V  
GNDA GNDP  
V
out  
= 1.5 V  
0
0.001  
0.01  
0.1  
1
10  
100  
1000  
I
(mA)  
out  
Figure 1. Typical Application Circuit  
Figure 2. Efficiency vs. Output Current  
©
Semiconductor Components I1dustries, LLC, 2006  
1
Publication Order Number:  
July, 2006 − Rev. 1  
NCP1508/D  
1234567...15

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