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KB3408B-1.8

更新时间： 2024-11-18 02:51:15
品牌 Logo 应用领域
KINGBOR 稳压器
页数 文件大小 规格书
6页 110K
描述
1.5MHz,350mA Synchronous Step-Down Regulator in SOT23-5

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中文翻译

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KB3408B-1.8 数据手册

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Kingbor Technology Co.,Ltd  
TEL:(86)0755-26508846 FAX:(86)0755-26509052  
KB3408  
350mA  
1.5MHz,  
Synchronous Step-Down  
Regulator in  
SOT23-5  
DESCRIPTION  
FEATURES  
■
■
High Efficiency: Up to 96%  
Very Low Quiescent Current: Only 20  
During Operation  
The KB3408 is a high efficiency monolithic synchro-  
nous buck regulator using a constant frequency, current  
mode architecture. The device is available in an adjustable  
versionandfixedoutputvoltagesof1.8Vand3.3V. Supply  
current during operation is only 20µA and drops to )1µA  
in shutdown. The 2.5V to 7.4V input voltage range makes  
the KB3408 ideally suited for single Li-Ion battery-pow-  
ered applications. 100% duty cycle provides low dropout  
operation, extending battery life in portable systems.  
Automatic Burst Mode operation increases efficiency at  
light loads, further extending battery life.  
µA  
■
■
■
■
■
■
■
■
350mA Output Current  
2.5V to 7.4V Input Voltage Range  
1.5MHz Constant Frequency Operation  
No Schottky Diode Required  
Low Dropout Operation: 100% Duty Cycle  
0.6V Reference Allows Low Output Voltages  
Shutdown Mode Draws)1µA Supply Current  
Current Mode Operation for Excellent Line and  
Load Transient Response  
Switching frequency is internally set at 1.5MHz, allowing  
the use of small surface mount inductors and capacitors.  
■
■
Overtemperature Protected  
Low Profile (1mm) SOT23-5 Package  
The internal synchronous switch increases efficiency and  
eliminates the need for an external Schottky diode. Low  
output voltages are easily supported with the 0.6V feed-  
back reference voltage. The KB3408 is available in a low  
profile (1mm) SOT23-5 package.  
APPLICATIONS  
■
Cellular Telephones  
■
Personal Information Appliances  
■
Wireless and DSL Modems  
■
Digital Still Cameras  
MP3 Players  
■
■
Portable Instruments  
TYPICAL APPLICATION  
95  
V
= 2.7V  
IN  
90  
85  
80  
75  
70  
65  
60  
4.7µH  
V
V
IN  
OUT  
4
1
3
5
V
= 3.6V  
IN  
2.7V  
1.8V  
V
SW  
IN  
C
C
TO 7.4V  
OUT  
350mA  
IN  
+
10µF  
V
= 4.2V  
4.7µF  
IN  
KB3408-1.8  
CER  
Tan  
RUN  
V
OUT  
GND  
2
V
= 1.8V  
OUT  
0.1  
1
10  
100  
500  
OUTPUT CURRENT (mA)  
Figure 1a. High Efficiency Step-Down Converter  
Figure 1b. Efficiency vs Load Current  
March 2007  
1
KB3408  
123456

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