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LT3845

更新时间： 2024-02-12 17:19:26
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
24页 224K
描述
High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency

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中文翻译

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LT3845 技术参数

是否Rohs认证： 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：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：3.58其他特性：ALSO HAS ADJUSTABLE OUTPUT UPTO 36V
模拟集成电路 - 其他类型：SWITCHING CONTROLLER控制模式：CURRENT-MODE
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：e3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：-55 °C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）：260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：PUSH-PULL
最大切换频率：330 kHz技术：CMOS
温度等级：MILITARY端子面层：Matte Tin (Sn)
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：30
宽度：4.4 mmBase Number Matches：1

LT3845 数据手册

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LT3845  
High Voltage Synchronous  
Current Mode Step-Down  
Controller with Adjustable  
Operating Frequency  
FEATURES  
DESCRIPTION  
The LT®3845 is a high voltage, synchronous, current  
mode controller used for medium to high power, high  
efficiency supplies. It offers a wide 4V to 60V input range  
(7.5V minimum start-up voltage). An onboard regulator  
simplifies the biasing requirements by providing IC power  
■
High Voltage Operation: Up to 60V  
■
Synchronizable Up to 600kHz  
■
Adjustable Constant Frequency: 100kHz to 500kHz  
■
Output Voltages Up to 36V  
■
Adaptive Nonoverlap Circuitry Prevents Switch  
Shoot-Through  
directly from V .  
IN  
■
Reverse Inductor Current Inhibit for Discontinuous  
Burst Mode® operation maintains high efficiency at light  
loads by reducing IC quiescent current to 120μA. Light  
load efficiency is also improved with the reverse inductor  
current inhibit function which supports discontinuous  
operation.  
Operation Improves Efficiency with Light Loads  
■
Programmable Soft-Start  
■
120μA No Load Quiescent Current  
■
10μA Shutdown Supply Current  
■
1% Regulation Accuracy  
■
Additional features include adjustable fixed operating  
frequency that can be synchronized to an external clock  
for noise sensitive applications, gate drivers capable of  
drivinglargeN-channelMOSFETs,aprecisionundervoltage  
lockout, 10μA shutdown current, short-circuit protection  
and a programmable soft-start.  
Standard Gate N-Channel Power MOSFETs  
■
Current Limit Unaffected by Duty Cycle  
■
Reverse Overcurrent Protection  
■
16-Lead Thermally Enhanced TSSOP Package  
APPLICATIONS  
■
The LT3845 is available in a 16-lead thermally enhanced  
TSSOP package.  
12V and 42V Automotive and Heavy Equipment  
■
48V Telecom Power Supplies  
■
Avionics and Industrial Control Systems  
Distributed Power Converters  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
■
Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258.  
TYPICAL APPLICATION  
Efficiency and Power Loss vs  
Load Current  
High Voltage Step-Down Regulator 48V to 12V at 75W  
V
100  
95  
90  
85  
80  
75  
70  
65  
7
6
5
4
3
2
1
0
IN  
V
IN  
= 48V  
20V TO 55V  
0.1μF  
2.2μF  
100V  
1M  
V
IN  
BOOST  
TG  
47μF  
63V  
SHDN  
Si7370DP  
V
0.01Ω  
LT3845  
OUT  
1500pF  
C
SS  
SW  
12V  
82.5k  
BAS521  
15μH  
B160  
75W  
BURST_EN  
V
CC  
33μF  
×3  
Si7370DP  
V
V
BG  
FB  
C
20k  
PGND  
LOSS  
100pF  
16.2k  
+
SYNC  
SENSE  
2200pF  
–
1μF  
f
SENSE  
SET  
0.1  
10  
1
SGND  
49.9k  
1N4148  
143k  
LOAD CURENT (A)  
3845 TA01a  
3845 TA01b  
3845fc  
1
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