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LTC3863

更新时间： 2024-09-14 12:00:39
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
36页 541K
描述
60V Low IQ Inverting DC/DC Controller Wide Operating VIN Range: 3.5V to 60V

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中文翻译

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LTC3863 数据手册

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LTC3863  
60V Low I Inverting  
Q
DC/DC Controller  
DESCRIPTION  
FEATURES  
The LTC®3863 is a robust, inverting DC/DC PMOS control-  
ler optimized for automotive and industrial applications. It  
drives a P-channel power MOSFET to generate a negative  
output and requires just a single inductor to complete the  
circuit. Output voltages from –0.4V to –150V are typically  
achievable with higher voltages possible, only limited by  
external components.  
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Wide Operating V Range: 3.5V to 60V  
IN  
OUT  
n
Wide Negative V  
Range: –0.4V to Beyond –150V  
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Low Operating I = 70µA  
Q
Strong High Voltage MOSFET Gate Driver  
Constant Frequency Current Mode Architecture  
Verified FMEA for Adjacent Pin Open/Short  
Selectable High Efficiency Burst Mode® Operation or  
Pulse-Skipping Mode at Light Loads  
The LTC3863 offers excellent light load efficiency, draw-  
ing only 70μA quiescent current in a user programmable  
Burst Mode operation. Its peak current mode, constant  
frequency PWM architecture provides for good control of  
switching frequency and output current limit. The switch-  
ing frequency can be programmed from 50kHz to 850kHz  
with an external resistor and can be synchronized to an  
external clock from 75kHz to 750kHz.  
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Programmable Fixed Frequency: 50kHz to 850kHz  
Phase-Lockable Frequency: 75kHz to 750kHz  
Accurate Current Limit  
Programmable Soft-Start or Voltage Tracking  
Internal Soft-Start Guarantees Smooth Start-Up  
Low Shutdown I = 7µA  
Q
Available in Small 12-Lead Thermally Enhanced  
MSOP and DFN Packages  
The LTC3863 offers programmable soft-start or output  
tracking. Safety features include overvoltage, overcurrent  
and short-circuit protection including frequency foldback.  
APPLICATIONS  
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Industrial and Automotive Power Supplies  
Telecom Power Supplies  
The LTC3863 is available in thermally enhanced 12-lead  
MSOP and 3mm × 4mm DFN packages.  
L, LT, LTC, LTM, OPTI-LOOP, Linear Technology, Burst Mode and the Linear logo are registered  
trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks  
are the property of their respective owners. Protected by U.S. Patents including 5731694.  
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Distributed Power Systems  
TYPICAL APPLICATION  
4.5V to 16V Input, –5V/1.7A Output, 350kHz Inverting Converter  
Efficiency  
V
IN  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
9
8
7
6
5
4
3
2
1
0
4.5V TO 16V  
+
10µF  
25V  
×2  
V
V
= 12V  
IN  
OUT  
0.47µF  
100µF  
20V  
= –5V  
CAP  
RUN  
V
IN  
350kHz  
27nF  
16mΩ  
Si7129  
PLLIN/MODE  
SS  
EFFICIENCY  
SENSE  
GATE  
14.7k  
V
OUT  
PULSE-SKIPPING MODE  
Burst Mode OPERATION  
ITH  
–5V  
LTC3863  
150µF  
33µF  
×2  
1.7A  
61.9k  
B540C  
16V  
+
FREQ  
10µH  
×2  
511k  
SGND  
POWER LOSS  
0.2  
V
FBN  
80.6k  
3863 TA01a  
68pF  
V
0.002  
0.02  
2
FB  
PGND  
LOAD CURRENT (A)  
3863 TA01b  
3863f  
1
For more information www.linear.com/3863  
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