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LT1619

更新时间： 2024-11-10 14:58:11
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
20页 261K
描述
低电压、电流模式 PWM 控制器

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中文翻译

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LT1619 数据手册

 浏览型号LT1619的Datasheet PDF文件第2页浏览型号LT1619的Datasheet PDF文件第3页浏览型号LT1619的Datasheet PDF文件第4页浏览型号LT1619的Datasheet PDF文件第5页浏览型号LT1619的Datasheet PDF文件第6页浏览型号LT1619的Datasheet PDF文件第7页 
LT1619  
Low Voltage Current Mode  
PWM Controller  
U
FEATURES  
DESCRIPTIO  
■
Wide VIN Range: 1.9V to 18V  
The LT®1619 is a fixed frequency PWM controller for  
implementing current mode DC/DC converters with mini-  
mum external parts. The LT1619 operates with input  
voltages ranging from 1.9V to 18V and is suitable for a  
variety of battery-powered and distributed DC/DC con-  
verters. The internal rail-to-rail N-channel MOSFET driver  
operates either from the input in the nonbootstrapped  
mode or from the output in bootstrapped operation. The  
driver is designed to drive a low side power transistor in  
boost, SEPIC, flyback and other topologies.  
■
300kHz Fixed Frequency Current Mode Control  
■
1A Rail-to-Rail N-Channel MOSFET Driver  
■
Low 53mV Current Limit Threshold Voltage  
Improves Efficiency  
■
Implements Boost, SEPIC and Flyback Converters  
Requiring Low Side Power Transistors  
■
Internal Current Sense Amplifier  
with Leading Edge Blanking  
■
Up to 500kHz External Synchronization  
Burst Mode® Operation for High Efficiency  
■
Converter efficiency is improved at heavy loads with a  
53mV current sense voltage and at light load with Burst  
Mode operation. The operating frequency is internally set  
at 300kHz. The oscillator can also be synchronized exter-  
nallyupto500kHz.Noloadquiescentcurrentis140µAand  
shutdown current is 15µA.  
at Light Load  
■
140µA Quiescent Current  
■
15µA Shutdown Current  
■
8-Lead MSOP and SO Packages  
U
APPLICATIO S  
The LT1619 is available in 8-lead MSOP and SO packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
■
3.3V to 5V DC/DC Converters  
■
Distributed Power Supplies  
■
Isolated Power Supplies  
U
TYPICAL APPLICATIO  
Efficiency  
V
IN  
3.3V  
95  
90  
1
2
3
4
8
7
6
5
L1  
37.4k  
S/S  
FB  
V
IN  
+
5.6µH  
C1  
0.1µF  
5A  
22µF  
12.4k  
85  
80  
75  
70  
DRV  
LT1619  
GATE  
V
OUT  
5V  
0.1µF  
2.2A  
M1  
Si9804  
D1  
V
C
+
75k  
15nF  
C
OUT  
440µF  
GND SENSE  
220pF  
R
SENSE  
0.01Ω  
1619 F01  
C1: PANASONIC EEFCDOK220R  
1
10  
100  
1000  
C
: KEMET T495X227K010AS (×2)  
OUT  
LOAD CURRENT (mA)  
D1: MBRD835L  
1619 F01a  
L1: COILCRAFT DO5022P-562  
Figure 1. High Efficiency 3.3V to 5V DC/DC Converter  
1619fa  
1
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