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LTC3892-2 PDF预览

LTC3892-2

更新时间： 2024-11-06 01:10:07
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
42页 1543K
描述
Low IQ, 60V Synchronous BoostBuck Controller

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LTC3892-2 数据手册

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LTC7813  
Low I , 60V Synchronous  
Q
Boost+Buck Controller  
FeaTures  
DescripTion  
The LTC®7813 is a high performance synchronous  
Boost+Buck DC/DC switching regulator controller that  
drives all N-channel power MOSFET stages. It contains  
independent step-up (boost) and step-down (buck)  
controllers that can regulate two separate outputs or be  
cascaded to regulate an output voltage from an input  
n
Synchronous Boost and Buck Controllers  
n
When Cascaded, Allows V Above, Below, or Equal  
IN  
to Regulated V  
of Up to 60V  
OUT  
n
n
Wide Bias Input Voltage Range: 4.5V to 60V  
Output Remains in Regulation Through Input Dips  
(e.g. Cold Crank) Down to 2.2V  
n
n
n
n
n
n
n
n
n
n
n
n
Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) voltage that can be above, below, or equal to the output  
Low EMI with Low Input and Output Ripple  
Fast Output Transient Response  
No External Bootstrap Diodes Required  
High Light Load Efficiency  
Low Operating I : 29µA (One Channel On)  
Low Operating I : 34µA (Both Channels On)  
voltage. The LTC7813 operates from a wide 4.5V to 60V  
input supply range. When biased from the output of the  
boost regulator, the LTC7813 can operate from an input  
supply as low as 2.2V after start-up. The 34μA no-load  
quiescent current (both channels on) extends operating  
runtime in battery-powered systems.  
Q
Q
R
or Lossless DCR Current Sensing  
SENSE  
Unlikeconventionalbuck-boostregulators,the LTC7813’s  
cascaded Boost+Buck solution has continuous, non-  
pulsating,inputandoutputcurrents,substantiallyreducing  
voltage ripple and EMI. The LTC7813 has independent  
feedback and compensation points for the boost and buck  
regulationloops,enablingafastoutputtransientresponse  
that can be externally optimized.  
Buck Output Voltage Range: 0.8V ≤ V  
≤ 60V  
OUT  
Boost Output Voltage Up 60V  
Phase-Lockable Frequency (75kHz to 850kHz)  
Small 32-Pin 5mm × 5mm QFN Package  
applicaTions  
n
Automotive and Industrial Power Systems  
High Power Battery Operated Systems  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
n
Typical applicaTion  
Wide Input Range to 10V/10A Low IQ Cascaded Boost+Buck Regulator  
V
IN  
10µH  
2.2µH  
8V TO 60V  
DOWN TO  
2.2V AFTER  
START-UP  
V , 12V**  
MID  
V
OUT  
10V  
10A*  
22µF  
×3  
22µF  
×3  
6.8µF  
×4  
47µF  
47µF  
47µF  
1.62k  
2.32k  
15k  
R
B1  
332k  
33pF  
0.1µF  
1µF  
0.1µF  
R
A1  
11.5k  
0.1µF  
SENSE2+ SENSE2– BG2 SW2 BOOST2 TG2  
V
FB2  
V
TG1 BOOST1 SW1 BG1 SENSE1+ SENSE1–  
V
BIAS  
FB1  
LTC7813  
EXTV  
CC  
RUN1 RUN2  
I
I
TRACK/SS1 SS2  
FREQ PLLIN/MODE GND DRV  
CC  
INTV VPRG2 ILIM DRVUVDRVSET  
CC  
TH1  
TH2  
7813 TA01  
V
IN  
0.1µF  
8.87k  
6.19k  
4.7µF  
0.1µF  
37.4k  
470pF  
100pF  
0.1µF  
3300pF  
22nF  
* WHEN V <8V MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED  
IN  
**V  
MID  
= 12V WHEN V < 12V  
IN  
MID  
V
FOLLOWS V WHEN VIN > 12V  
IN  
7813f  
1
For more information www.linear.com/LTC7813  
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