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LT3844EFE PDF预览

LT3844EFE

更新时间： 2024-09-23 12:35:27
品牌 Logo 应用领域
凌特 - Linear 开关控制器
页数 文件大小 规格书
24页 205K
描述
High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency

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中文翻译

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LT3844EFE 技术参数

是否Rohs认证： 不符合生命周期：Transferred
零件包装代码：TSSOP包装说明：HTSSOP, TSSOP16,.25
针数：16Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.13模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：60 V最小输入电压：4 V
标称输入电压：20 VJESD-30 代码：R-PDSO-G16
JESD-609代码：e0长度：5 mm
湿度敏感等级：1功能数量：1
端子数量：16最高工作温度：125 °C
最低工作温度：封装主体材料：PLASTIC/EPOXY
封装代码：HTSSOP封装等效代码：TSSOP16,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：235认证状态：Not Qualified
座面最大高度：1.1 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：BUCK
最大切换频率：500 kHz温度等级：OTHER
端子面层：Tin/Lead (Sn/Pb)端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
处于峰值回流温度下的最长时间：20宽度：4.4 mm
Base Number Matches：1

LT3844EFE 数据手册

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LT3844  
High Voltage, Current Mode  
Switching Regulator Controller with  
Programmable Operating Frequency  
FEATURES  
DESCRIPTION  
TheLT®3844isaDC/DCcontrollerusedformediumpower,  
n
High Voltage Operation: Up to 60V  
n
Output Voltages Up to 36V (Step Down)  
Programmable Constant Frequency: 100kHz to  
500kHz  
low part count, high efficiency suppliesꢀ It offers a wide  
4V to 60V input range (7ꢀ5V minimum start-up voltage)  
and can implement step-down, step-up, inverting and  
SEPIC topologiesꢀ  
n
n
n
n
n
n
n
n
n
n
n
n
Synchronizable up to 600kHz  
Burst Mode® Operation: 120μA Supply Current  
10μA Shutdown Supply Current  
1ꢀ3ꢁ ꢂeference Accuracy  
TheLT3844includesBurstModeoperation,whichreduces  
quiescent current below 120μA and maintains high effi-  
ciencyatlightloadsꢀAninternalhighvoltagebiasregulator  
allows for simple biasingꢀ  
Drives N-Channel MOSFET  
Programmable Soft-Start  
Programmable Undervoltage Lockout  
Internal High Voltage ꢂegulator for Gate Drive  
Thermal Shutdown  
Current Limit Unaffected by Duty Cycle  
16-Pin Thermally Enhanced TSSOP Package  
Additional features include current mode control for fast  
line and load transient response; programmable fixed  
operating frequency that can be synchronized to an ex-  
ternal clock for noise sensitive applications; a gate driver  
capable of driving large N-channel MOSFETs; a precision  
undervoltage lockout function; 10μA shutdown current;  
short-circuit protection and a programmable soft-start  
functionꢀ  
APPLICATIONS  
n
Industrial Power Distribution  
The LT3844 is available in a 16-lead thermally enhanced  
TSSOP packageꢀ  
n
12V and 42V Automotive and Heavy Equipment  
n
High Voltage Single Board Systems  
Distributed Power Systems  
Avionics  
Telecom Power  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporationꢀ  
Burst Mode is a registered trademark of Linear Technology Corporationꢀ  
All other trademarks are the property of their respective ownersꢀ  
n
n
Protected by UꢀSꢀ Patents, including 5731694, 6498466, 6611131  
n
TYPICAL APPLICATION  
High Voltage Step-Down Regulator 48V to 12V, 50W  
Efficiency and Power Loss  
vs Load Current  
V
IN  
36V TO 60V  
68μF  
22μF  
90  
88  
86  
84  
82  
80  
78  
76  
7
6
5
4
3
2
1
0
0ꢀ22μF  
V
= 48V  
IN  
1M  
V
BOOST  
TG  
IN  
SHDN  
Si7850DP  
10μH  
1000pF  
EFFICIENCY  
10Ω  
82ꢀ5k  
C
SS  
SW  
BUꢂST_EN  
V
CC  
V
0ꢀ015Ω  
OUT  
1μF  
LT3844  
12V  
LOSS  
V
V
PGND  
50W  
FB  
68μF  
PDS5100H  
10k  
680p  
14ꢀ7k  
33μF  
+
SENSE  
C
120pF  
–
SYNC  
SENSE  
130k  
0ꢀ1  
10  
1
f
SGND  
SET  
LOAD CUꢂꢂENT (A)  
ꢂ7  
49ꢀ9k  
3844 TA01b  
3844 TA01  
3844fb  
1
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中文翻译

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