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LT3844

更新时间： 2024-09-23 05:43:35
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 241K
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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LT3844 数据手册

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LT3844  
High Voltage, Current Mode  
Switching Regulator Controller with  
Programmable Operating Frequency  
U
FEATURES  
DESCRIPTIO  
The LT®3844 is a DC/DC controller used for medium  
power, low part count, high efficiency supplies. It offers  
a wide 4V-60V input range (7.5V minimum startup volt-  
age) and can implement step-down, step-up, inverting  
and SEPIC topologies.  
■
High Voltage Operation: Up to 60V  
Output Voltages up to 36V (Step-Down)  
Programmable Constant Frequency: 100kHz to  
■
■
500kHz  
■
Synchronizable up to 600kHz  
Burst Mode® Operation: 120μA Supply Current  
■
The LT3844 includes Burst Mode operation, which re-  
duces quiescent current below 120μA and maintains high  
efficiency at light loads. An internal high voltage bias  
regulator allows for simple biasing.  
■
10μA Shutdown Supply Current  
■
1.3% Reference Accuracy  
■
Drives N-Channel MOSFET  
Programmable Soft-Start  
Programmable Undervoltage Lockout  
Internal High Voltage Regulator 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 exter-  
nal 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  
function.  
■
■
■
■
U
APPLICATIO S  
■
Industrial Power Distribution  
12V and 42V Automotive and Heavy Equipment  
High Voltage Single Board Systems  
Distributed Power Systems  
Avionics  
Telecom Power  
■
The LT3844 is available in a 16-lead thermally enhanced  
TSSOP package.  
■
■
, 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 5731694, 6498466, 6611131.  
U
TYPICAL APPLICATIO  
High Voltage Step-Down Regulator 48V to 12V, 50W  
Efficiency and Power Loss  
vs Load Current  
V
IN  
90  
88  
86  
84  
82  
80  
78  
76  
7
6
5
4
3
2
1
0
36V  
TO  
0.22μF  
68μF  
22μF  
1 MEG  
60V  
V
BOOST  
TG  
IN  
SHDN  
Si7850DP  
EFFICIENCY  
1000pF  
10Ω  
82.5k  
C
SW  
SS  
BURST_EN  
V
CC  
10μH  
0.02Ω  
LOSS  
LT3844  
1μF  
V
OUT  
V
V
PGND  
12V  
FB  
C
PDS5100H  
50W  
10k  
680p  
+
SENSE  
68μF  
33μF  
130k  
14.7k  
120pF  
V
= 48V  
–
IN  
SYNC  
SENSE  
0.1  
10  
1
3844 TA01  
f
SGND  
LOAD CURRENT (A)  
SET  
3844 TA01b  
R7  
49.9k  
3844fa  
1
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