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LTC3406BES5#TRPBF

更新时间： 2024-02-05 11:59:20
品牌 Logo 应用领域
凌特 - Linear 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
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LTC3406B  
1.5MHz, 600mA  
Synchronous Step-Down  
Regulator in ThinSOT  
U
FEATURES  
DESCRIPTIO  
The LTC®3406B is a high efficiency monolithic synchro-  
nous buck regulator using a constant frequency, current  
mode architecture. The device is available in an adjustable  
versionandfixedoutputvoltagesof1.5Vand1.8V. Supply  
current with no load is 300µA and drops to <1µA in  
shutdown. The2.5Vto5.5Vinputvoltagerangemakesthe  
LTC3406BideallysuitedforsingleLi-Ionbattery-powered  
applications. 100% duty cycle provides low dropout op-  
eration, extending battery life in portable systems. PWM  
pulse skipping mode operation provides very low output  
ripple voltage for noise sensitive applications.  
■
High Efficiency: Up to 96%  
■
600mA 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  
■
Low Quiescent Current: 300µA  
■
0.6V Reference Allows Low Output Voltages  
■
Shutdown Mode Draws <1µA Supply Current  
■
Current Mode Operation for Excellent Line and  
Load Transient Response  
■
Overtemperature Protected  
Switching frequency is internally set at 1.5MHz, allowing  
the use of small surface mount inductors and capacitors.  
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 LTC3406B is available in a low  
profile (1mm) ThinSOT package. Refer to LTC3406 for  
applications that require Burst Mode® operation.  
Low Profile (1mm) ThinSOTTM Package  
■
U
APPLICATIO S  
■
Cellular Telephones  
■
Personal Information Appliances  
■
Wireless and DSL Modems  
■
Digital Still Cameras  
■
MP3 Players  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
ThinSOT is a trademark of Linear Technology Corporation.  
■
Portable Instruments  
Protected by U.S. Patents, including 6580258, 5481178.  
U
TYPICAL APPLICATIO  
100  
V
= 1.8V  
= 3.6V  
OUT  
90  
80  
70  
60  
50  
40  
30  
20  
10  
2.2µH*  
V
V
IN  
OUT  
4
1
3
5
V
IN  
2.7V  
1.8V  
V
SW  
LTC3406B-1.8  
RUN  
IN  
†
C
C
**  
TO 5.5V  
OUT  
600mA  
IN  
V
= 2.7V  
IN  
10µF  
4.7µF  
CER  
CER  
3406B F01a  
V
OUT  
GND  
2
V
= 4.2V  
IN  
*MURATA LQH32CN2R2M33  
**TAIYO YUDEN JMK212BJ475MG  
†TAIYO YUDEN JMK316BJ106ML  
0.1  
1000  
1
10  
100  
OUTPUT CURRENT (mA)  
3406B F01b  
Figure 1a. High Efficiency Step-Down Converter  
Figure 1b. Efficiency vs Load Current  
3406bfa  
1
1234567...16

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