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LTC3896 PDF预览

LTC3896

更新时间： 2022-02-26 10:27:23
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
38页 2317K
描述
150V Low IQ, Synchronous Step-Down DC/DC Controller

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中文翻译

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LTC3896 数据手册

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LTC7801  
150V Low I , Synchronous  
Q
Step-Down DC/DC Controller  
FeaTures  
DescripTion  
TheLTC®7801isahighperformancestep-downswitching  
regulator DC/DC controller that drives an all N-channel  
synchronous power MOSFET stage that can operate from  
input voltages up to 140V. A constant frequency current  
mode architecture allows a phase-lockable frequency of  
up to 850kHz.  
n
Wide V Range: 4V to 140V (150V Abs Max)  
IN  
n
Wide Output Voltage Range: 0.8V to 60V  
Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE)  
Low Operating I : 40μA (Shutdown = 10μA)  
100% Duty Cycle Operation  
n
n
Q
n
n
n
n
n
n
n
n
No External Bootstrap Diode Required  
Selectable Gate Drive UVLO Thresholds  
Onboard LDO or External NMOS LDO for DRV  
The gate drivevoltage can beprogrammed from 5V to10V  
to allow the use of logic or standard-level FETs to maxi-  
mize efficiency. An integrated switch in the top gate driver  
eliminates the need for an external bootstrap diode. An  
internalchargepumpallowsfor100%dutycycleoperation.  
CC  
EXTV LDO Powers Drivers from V  
CC  
OUT  
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  
Thelow40μAno-loadquiescentcurrentextendsoperating  
run time in battery-powered systems. OPTI-LOOP® com-  
pensation allows the transient response to be optimized  
over a wide range of output capacitance and ESR values.  
The LTC7801 features a precision 0.8V reference and  
power good output indicator. The output voltage can be  
programmedbetween0.8Vto60Vusingexternalresistors.  
n
n
n
n
Adjustable Burst Clamp  
Power Good Output Voltage Monitor  
Programmable Input Overvoltage Lockout  
Small 24-Lead 4mm × 5mm QFN or TSSOP Packages  
applicaTions  
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, PolyPhase, Linear Technology and the Linear logo  
are registered trademarks of Analog Devices, Inc. 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
High Voltage Battery Operated Systems  
n
Telecommunications Power Systems  
Typical applicaTion  
High Efficiency High Voltage 12V Output Step-Down Regulator  
Efficiency and Power Loss  
vs Load Current  
V
IN  
7V to 140V  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
10k  
1k  
100µF  
V
RUN  
IN  
NDRV  
DRV  
TG  
EFFICIENCY  
0.1µF  
*V  
FOLLOWS V WHEN V < 12V  
IN IN  
OUT  
CC  
BOOST  
6mΩ  
33µH  
4.7µF  
V
OUT  
LTC7801  
12V*  
SW  
5A  
INTV  
CC  
100  
10  
1
BG  
V
= 24V  
IN  
150µF  
x3  
CPUMP_EN  
0.1µF  
POWER LOSS  
V
IN  
= 48V  
SENSE+  
ITH  
1nF  
SENSE–  
SS  
10k  
EXTV  
0.1µF  
30.1k  
CC  
100pF  
511k  
FREQ  
V
FB  
0.0001 0.001  
0.01  
0.1  
1
10  
4.7nF  
36.5k  
LOAD CURRENT (A)  
GND  
7801 TA01b  
7801 TA01a  
7801f  
1
For more information www.linear.com/LTC7801  
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