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LTC3408

更新时间: 2024-09-30 22:55:55
品牌 Logo 应用领域
凌特 - Linear 晶体稳压器晶体管
页数 文件大小 规格书
12页 157K
描述
1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor

LTC3408 数据手册

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LTC3408  
1.5MHz, 600mA  
Synchronous Step-Down  
Regulator with Bypass Transistor  
U
FEATURES  
DESCRIPTIO  
The LTC®3408 is a high efficiency monolithic synchro-  
nous buck regulator optimized for WCDMA power ampli-  
fier applications. The output voltage can be dynamically  
programmed from 0.3V to 3.5V. At VOUT > 3.6V an internal  
0.08bypass P-channel MOSFET connects VOUT directly  
to VIN, eliminating power loss through the inductor.  
Dynamically Adjustable Output from 0.3V to 3.5V  
600mA Output Current  
Internal 0.08  
Transistor  
High Efficiency: Up to 96%  
1.5MHz Constant Frequency Operation  
No Schottky Diode Required  
Low Dropout Operation: 100% Duty Cycle  
2.5V to 5V Input Voltage Range  
Shutdown Mode Draws <1µA Supply Current  
Current Mode Operation for Excellent Line and  
Load Transient Response  
Overtemperature Protected  
Available in 8-Lead 3mm × 3mm DFN Package  
P-Channel MOSFET Bypass  
The input voltage range is 2.5V to 5V making the LTC3408  
ideally suited for single Li-Ion battery-powered applica-  
tions. 100% duty cycle provides low dropout operation,  
extending battery life in portable systems.  
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.  
U
The LTC3408 is available in a low profile (0.75mm) 8-lead  
3mm × 3mm DFN package.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U.S. Patent Numbers: 5481178, 6580258, 6304066, 6127815, 6498466, 6611131  
APPLICATIO S  
WCDMA Cell Phone Power Amplifiers  
Wireless Modems  
U
TYPICAL APPLICATIO  
Efficiency Power Lost vs Load Current  
WCDMA Transmitter Power Supply  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1
4.7µH*  
V
V
IN  
2.7V  
OUT  
REF  
3× V  
V
SW  
LTC3408  
IN  
C
**  
600mA  
C
TO 5V  
OUT  
IN  
4.7µF  
10µF  
CER  
0.1  
CER  
V
OUT  
RUN  
REF  
GND  
OUTPUT  
WCDMA  
RF PA  
PROGRAMMING  
DAC  
0.01  
0.01  
V
V
V
V
= 1.2V  
= 1.5V  
= 1.8V  
= 2.5V  
OUT  
OUT  
OUT  
OUT  
*MURATA LQH32CN4R7M11  
3403 TA01  
**TAIYO YUDEN JMK212BJ475MG  
TAIYO YUDEN JMK212BJ106MN  
1
10  
100  
1000  
LOAD CURRENT (mA)  
3408 F04  
3408f  
1

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