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LT3692

更新时间： 2024-11-11 11:42:31
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
36页 526K
描述
Monolithic Dual Tracking 3.5A Step-Down Switching Regulator

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LT3692 数据手册

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LT3692  
Monolithic Dual Tracking  
3.5A Step-Down  
Switching Regulator  
DESCRIPTION  
The LT®3692 is a dual current mode PWM step-down  
DC/DCconverterwithtwointernal3.8Aswitches.Indepen-  
dentinputvoltage,shutdown,feedback,soft-start,current  
limit and comparator pins for each channel simplify com-  
plexpowersupplytrackingandsequencingrequirements.  
FEATURES  
n
Wide Input Range:  
– Operation from 3V to 36V  
– OVLO Protects Circuit Through 60V Transients  
Independent Supply, Shutdown, Soft-Start,  
n
Programmable Current Limit and Programmable  
Power Good for Each 3.5A Regulator  
To optimize efficiency and component size, both convert-  
ers have a programmable maximum current limit and are  
synchronized to either a common external clock input,  
or a resistor settable fixed 250kHz to 2.25MHz internal  
oscillator. A frequency divider is provided for channel 1  
to further optimize component size. At all frequencies, a  
180° phase relationship between channels is maintained,  
reducingvoltagerippleandcomponentsize.Aclockoutput  
is available for synchronizing multiple regulators.  
n
Die Temperature Monitor  
n
Adjustable/Synchronizable Fixed Frequency  
Operation from 250kHz to 2.25MHz with  
Synchronized Clock Output  
n
Independent Synchronized Switching Frequencies  
Optimize Component Size  
n
Antiphase Switching  
n
Outputs Can Be Paralleled  
n
Flexible Output Voltage Tracking  
n
Minimum input to output voltage ratios are improved by  
allowingtheswitchtostayonthroughmultipleclockcycles  
onlyswitchingoffwhentheboostcapacitorneedsrecharg-  
ing. Independent channel operation can be programmed  
using the SHDN pin. Disabling both converters reduces  
the total quiescent to <10µA.  
Enhanced Short-Circuit Protection  
n
Low Dropout: 95% Maximum Duty Cycle  
n
5mm × 5mm QFN Package  
APPLICATIONS  
n
Automotive Supplies  
Distributed Supply Regulation  
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
n
Independent Synchronized Switching Frequencies  
Extend Full Frequency Input Range  
TYPICAL APPLICATION  
Dual 1.8V/3.5A and 5V/3.5A Step-Down Converter  
CLKOUT  
V
IN  
6V TO 32V  
4.7µF  
×2  
SW1  
V
V
IN2  
IN1  
SHDN1  
BST1  
SHDN2  
BST2  
V
SW1  
IND1  
SW2  
IND2  
OUT2  
SW2  
6.8µH  
6.8µH  
42.2k  
0.47µF  
1µF  
V
OUT1  
3692 TA01b  
LT3692  
V
OUT2  
V
IN  
= 12V  
1µs/DIV  
1.8V 3.5A  
500kHz/  
250kHz  
5V 3.5A  
500kHz  
V
OUT1  
V
OUT2  
FB2  
100µF  
8.06k  
47µF  
10k  
FB1  
100k  
8.06k  
×2  
CMPI1  
CMPO1  
SS1  
CMPI2  
CMPO2  
SS2  
143k  
CLKOUT  
SW1  
PG2  
SS2  
7.15k  
60.4k  
ILIM2  
ILIM1  
DIV  
ILIM2  
CLOCKOUT  
500kHz  
CLKOUT  
60.4k  
V
C2  
V
C1  
60.4k  
47pF  
680pF  
330pF  
36.5k  
RT/SYNC  
T
J
0.1µF  
GND  
33pF  
SW2  
13.0k  
17.8k  
0.1µF  
3692 TA01c  
3692 TA01a  
V
IN  
= 24V  
1µs/DIV  
3692f  
1
1234567...36

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