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CLS4D11

更新时间： 2024-11-01 21:55:07
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安森美 - ONSEMI 转换器
页数 文件大小 规格书
16页 162K
描述
Up to 500 mA, High Efficiency Synchronous Step-Down DC-DC Converter

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NCP1511  
Up to 500 mA, High  
Efficiency Synchronous  
Step−Down DC−DC Converter  
in Chip Scale Package  
http://onsemi.com  
The NCP1511 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 NCP1511 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 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 NCP1511 is available in a chip scale  
package.  
MARKING  
DIAGRAM  
9 PIN  
MICRO BUMP  
FC SUFFIX  
CASE 499AC  
A1  
DAL  
AYWW  
XX = Device Code  
A
Y
= Assembly Location  
= Year  
WW = Work Week  
A1  
PIN CONNECTIONS  
Pin: A1. − GNDP  
A2. − LX  
Features  
A1  
B1  
C1  
C2  
C3  
A3. − VCC  
B1. − SYNC  
B2. − GNDA  
B3. − FB  
C1. − SHD  
C2. − CB1  
C3. − CB0  
• High Efficiency:  
93% for 1.89 V Output at 3.6 V Input and 150 mA Load Current  
92% for 1.89 V Output at 3.6 V Input and 300 mA Load Current  
A2  
A3  
B2  
B3  
• 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  
(Bottom View)  
• Low Quiescent Current of 14 mA in Pulsed Switching Mode  
• Low 0.1 mA Shutdown Current  
• −30°C to 85°C Operation Temperature  
• Ceramic Input/Output Capacitor  
ORDERING INFORMATION  
†
Device  
Package  
Shipping  
• 9 Pin Chip Scale Package  
NCP1511FCT1  
Micro Bump 3000 Tape & Reel  
• Pb−Free Package is Available  
NCP1511FCT1G Micro Bump 3000 Tape & Reel  
(Pb−Free)  
Applications  
• Cellular Phones, Smart Phones and PDAs  
• Digital Still Cameras  
• MP3 Players and Portable Audio Systems  
• Wireless and DSL Modems  
• Portable Equipment  
†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.  
100  
90  
Pulsed Mode  
80  
PWM Mode  
6.8 mH  
70  
60  
50  
40  
30  
20  
10  
0
V
A3  
C1  
A2  
B3  
in  
VCC  
SHD  
LX  
V
out  
2.5 V − 5.2 V  
C
10 mF  
C
out  
in  
FB  
22 mF  
C2  
C3  
CB1  
CB0 and CB1  
Control Input  
B1  
SYNC CB0  
V
in  
= 3.6 V  
= 1.5 V  
V
out  
T = 25°C  
A
GNDA GNDP  
B2  
A1  
0.1  
1
10  
(mA)  
100  
1000  
I
out  
Figure 1. Typical Application Circuit  
Figure 2. Efficiency vs. Output Current  
Semiconductor Components Industries, LLC, 2005  
1
Publication Order Number:  
January, 2005 − Rev. 5  
NCP1511/D  
1234567...16

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