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LTC3896 PDF预览

LTC3896

更新时间： 2023-12-20 18:45:20
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
36页 1995K
描述
150V、低 IQ、同步负输出 DC/DC 控制器

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中文翻译

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LTC3896 数据手册

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LTC3896  
150V Low I , Synchronous  
Q
Inverting DC/DC Controller  
FeaTures  
DescripTion  
–
Wide V + |V  
| Range: 4V to 140V (150V Abs Max) The LTC®3896 is a high performance inverting DC/DC  
n
IN  
OUT  
n
n
n
n
n
n
n
n
n
n
n
Wide Output Voltage Range: –60V to –0.8V  
switching regulator controller that drives an all N-channel  
synchronous power MOSFET stage. It converts a wide-  
Ground-Referenced Control / Interface Pins  
Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) rangingpositiveinputvoltagesourcetoaregulatednegative  
Integrated Bootstrap Diode  
output that can be as much as 60V below ground. The  
Low Operating I : 40μA (Shutdown = 10μA)  
input can operate from a voltage as low as 4V and as high  
Q
–
Selectable Gate Drive UVLO Thresholds  
as 140V – |V  
|.  
OUT  
Onboard LDO or External NMOS LDO for DRV  
CC  
TheLTC3896containstrueground-referencedRUN,PLLIN  
andPGOODpins,eliminatingtheneedforexternaldiscrete  
level-shifting components to interface with the LTC3896.  
EXTV LDO Powers Drivers from Output  
CC  
Phase-Lockable Frequency (75kHz to 850kHz)  
Programmable Fixed Frequency (50kHz to 900kHz)  
Selectable Continuous, Pulse-Skipping or Low Ripple  
Burst Mode® Operation at Light Loads  
A constant frequency current mode architecture allows a  
phase-lockable frequency of up to 850kHz. The low 40μA  
no-load quiescent current extends operating run time in  
battery-powered systems. OPTI-LOOP® compensation  
allows the transient response to be optimized over a  
wide range of output capacitance and ESR values. The  
LTC3896 features a precision 0.8V reference and power  
good output indicator. The soft-start (SS) pin ramps the  
output voltage during start-up.  
n
n
n
n
Adjustable Burst Clamp and Current Limit  
Power Good Output Voltage Monitor  
Programmable Input Overvoltage Lockout  
38-Lead TSSOP High Voltage Package  
applicaTions  
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and OPTI-LOOP are  
registered trademarks of Linear Technology Corporation. All other trademarks are the property  
of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620,  
6144194, 6177787, 6580258.  
n
Automotive and Industrial Power Systems  
n
Telecommunications Power Supplies  
n
Distributed Power Systems  
Typical applicaTion  
High Efficiency 36V–72V to –48V/2A Inverting Regulator  
Efficiency and Power Loss  
vs Load Current  
V
IN  
36V to 72V  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
100k  
10k  
1k  
V
IN  
0V  
RUN  
TG  
47µF  
EFFICIENCY  
0.1µF  
PLLIN  
GND  
0V  
BOOST  
100k  
–
V
OUT  
5V  
PGOOD  
NDRV  
SW  
–48V  
2A  
LTC3896  
POWER LOSS  
0.1µF  
×3  
47µH  
DRV  
CC  
4.7µF  
100V  
2220  
×4  
INTV  
+
CC  
SENSE  
4.7µF  
100  
10  
DRVSET  
0.1µF  
V
= +48V  
= –48V  
10mΩ  
IN  
301k  
–
DRVUV  
V
OUT  
FIGURE 16 CIRCUIT  
0.1 10  
LOAD CURRENT (A)  
–
SENSE  
SS  
0.0001 0.001  
0.01  
1
BG  
ITH  
3896 TA01b  
590k  
10k  
4.99k  
FREQ  
–
V
0.1µF  
FB  
V
100pF  
OUT  
15nF  
3896 TA01a  
3896f  
1
For more information www.linear.com/LTC3896  
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