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LT3505EMS8E#TRPBF PDF预览

LT3505EMS8E#TRPBF

更新时间: 2024-11-04 13:09:39
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
24页 806K
描述
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LT3505EMS8E#TRPBF 数据手册

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LT3505  
1.2A, Step-Down  
Switching Regulator in  
3mm × 3mm DFN  
FEATURES  
DESCRIPTION  
The LT®3505 is a current mode PWM step-down DC/DC  
converter with an internal 1.4A power switch. The wide  
operating input range of 3.6V to 36V (40V maximum)  
makes the LT3505 ideal for regulating power from a wide  
variety of sources, including unregulated wall transform-  
ers, 24V industrial supplies and automotive batteries. The  
oscillatorcanbeprogrammedforhighfrequencyoperation  
allowing the use of tiny, low cost external components or  
it can be programmed for lower frequency operation to  
maximize efficiency.  
!
Wide Input Range: 3.6V to 36V Operating,  
40V Maximum  
!
Up to 1.2A Output Current  
!
Resistor-Programmable Fixed-Frequency Operation  
from 200kHz to 3MHz  
!
Output Adjustable Down to 780mV  
!
Short-Circuit Robust  
!
Uses Tiny Capacitors and Inductors  
!
Soft-Start  
!
Low Shutdown Current: <2µA  
!
Low VCESAT Switch: 350mV at 1A  
Cycle-by-cycle current limit provides protection against  
shorted outputs and soft-start eliminates input current  
surge during start-up. The low current (<2µA) shutdown  
mode provides output disconnect, enabling easy power  
management in battery-powered systems.  
!
Thermally Enhanced, Low Profile 3mm x 3mm  
DFN-8 and MSOP-8 Packages  
APPLICATIONS  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
!
Automotive Battery Regulation  
!
Industrial Control Supplies  
!
Wall Transformer Regulation  
!
Distributed Supply Regulation  
!
Battery-Powered Equipment  
TYPICAL APPLICATION  
750kHz, 3.3V Step-Down Converter  
Efficiency  
V
OUT  
90  
85  
80  
75  
70  
65  
60  
55  
50  
V
IN  
3.3V  
V
BOOST  
SW  
IN  
4.2V TO 36V  
1.1A, V > 5V  
1.2A, V > 8V  
IN  
IN  
0.1µF  
10µH  
36.5k  
ON OFF  
SHDN  
LT3505  
GND  
22pF  
FB  
10µF  
11.3k  
R
V
C
T
V
V
f
= 12V  
= 3.3V  
= 750kHz  
75.0k  
69.8k  
68pF  
IN  
OUT  
SW  
1µF  
L = 10 H  
0.8  
LOAD CURRENT (A)  
1.0  
0
0.2  
0.4  
0.6  
1.2  
3505 TA01  
3505fc  
1

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