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LTC3405A

更新时间： 2024-09-18 14:58:19
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
16页 214K
描述
采用 ThinSOT 封装的 1.5MHz、300mA 同步降压型稳压器

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中文翻译

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LTC3405A 数据手册

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LTC3405A  
1.5MHz, 300mA  
Synchronous Step-Down  
Regulator in ThinSOT  
U
DESCRIPTIO  
FEATURES  
■
High Efficiency: Up to 96%  
The LTC®3405A is a high efficiency monolithic synchro-  
nous buck regulator using a constant frequency, current  
mode architecture. Supply current during operation is  
only 20µA and drops to <1µA in shutdown. The 2.5V to  
5.5V input voltage range makes the LTC3405A ideally  
suitedforsingleLi-Ionbattery-poweredapplications.100%  
duty cycle provides low dropout operation, extending  
battery life in portable systems.  
■
Very Low Quiescent Current: Only 20µA  
During Operation  
■
300mA Output Current at VIN = 3V  
2.5V to 5.5V Input Voltage Range  
1.5MHz Constant Frequency Operation  
No Schottky Diode Required  
Low Dropout Operation: 100% Duty Cycle  
Stable with Ceramic Capacitors  
0.8V Reference Allows Low Output Voltages  
Shutdown Mode Draws <1µA Supply Current  
±2% Output Voltage Accuracy  
■
■
■
■
■
■
■
■
■
Switching frequency is internally set at 1.5MHz, allowing  
the use of small surface mount inductors and capacitors.  
The LTC3405A is specifically designed to work well with  
ceramic output capacitors, achieving very low output  
voltage ripple and a small PCB footprint.  
Current Mode Operation for Excellent Line and  
Load Transient Response  
■
■
Overtemperature Protected  
The internal synchronous switch increases efficiency and  
eliminates the need for an external Schottky diode. Low  
output voltages are easily supported with the 0.8V feed-  
back reference voltage. The LTC3405A is available in a low  
profile (1mm) ThinSOT package.  
Low Profile (1mm) ThinSOTTM Package  
U
APPLICATIO S  
■
Cellular Telephones  
■
■
■
■
■
For fixed 1.5V and 1.8V output versions, refer to the  
LTC3405A-1.5/LTC3405A-1.8 data sheet.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
ThinSOT is a trademark of Linear Technology Corporation.  
Protected by U.S. Patents, including 6580258, 5481178.  
Personal Information Appliances  
Wireless and DSL Modems  
Digital Still Cameras  
MP3 Players  
Portable Instruments  
U
TYPICAL APPLICATIO  
100  
V
= 3.6V  
= 4.2V  
IN  
95  
90  
85  
80  
75  
70  
65  
60  
4.7µH**  
V
IN  
4
3
V
*
OUT  
2.7V  
V
SW  
LTC3405A  
IN  
3.3V  
†
22pF  
C
TO 5.5V  
IN  
††  
C
OUT  
2.2µF  
CER  
4.7µF  
V
IN  
1
6
RUN  
CER  
5
MODE  
V
FB  
887k  
V
IN  
= 5.5V  
GND  
280k  
2
3405A F01a  
*V  
CONNECTED TO V FOR 2.7V < V < 3.3V  
IN IN  
OUT  
**MURATA LQH3C4R7M34  
†TAIYO YUDEN LMK212BJ225MG  
††TAIYO YUDEN JMK212BJ475MG  
0.1  
1000  
1
10  
100  
OUTPUT CURRENT (mA)  
3405A F01b  
Figure 1a. High Efficiency Step-Down Converter  
Figure 1b. Efficiency vs Load Current  
3405afa  
1
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