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LT3988

更新时间： 2023-12-20 18:46:16
品牌 Logo 应用领域
亚德诺 - ADI 开关稳压器
页数 文件大小 规格书
24页 280K
描述
双通道、60V、单片式 1A 降压型开关稳压器

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中文翻译

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LT3988 数据手册

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LT3988  
Dual 60V Monolithic 1A  
Step-Down Switching  
Regulator  
FeaTures  
DescripTion  
The LT®3988 is a dual, current mode, step-down, DC/DC  
converter that accepts two input voltages up to 60V (80V  
transient), which may be driven from separate supplies or  
can be cascaded. High efficiency switches are included on  
thediealongwithinternalboostdiodesandloopcompensa-  
tion.Bothconvertersarecapableofgenerating1Aoutputs,  
are synchronized to a single oscillator programmable up  
to 2.5MHz, and run with opposite phases, reducing input  
ripple current.  
n
Wide Input Range:  
Operation from 4.1V to 60V  
Overvoltage Lockout Protects Circuit Through  
80V Transients  
Two 1A Output Switching Regulators with Internal  
Power Switches  
Short Circuit Robust  
Adjustable 250kHz to 2.5MHz Switching Frequency,  
Synchronizable Over the Full Range  
Integrated Boost Diodes  
Integrated Loop Compensation  
Anti-Phase Switching Reduces Ripple  
Low Shutdown I (<2µA)  
n
n
n
n
n
n
n
n
n
The switching frequency is set with a single resistor yield-  
ing a range of 250kHz to 2.5MHz, or a clock signal can  
be applied to the SYNC pin. The LT3988’s high switching  
frequencyallowstheuseofsmallinductorsandcapacitors,  
resulting in a very small dual output supply. The constant  
switching frequency, combined with low impedance ce-  
ramic capacitors, results in low, predictable output ripple.  
A current mode PWM architecture provides fast transient  
responsewithcycle-by-cyclecurrentlimiting.Diodecurrent  
senseandthermalshutdownprovideadditionalprotection.  
Q
Uses Small Inductors and Ceramic Capacitors  
Thermally Enhanced, 16-Lead MSOP Package  
applicaTions  
n
Commercial Vehicle Battery Regulation  
n
Industrial Supplies  
n
Distributed Supply Regulation  
The LT3988 is available in a 16-lead MSOP package with  
an exposed pad for low thermal resistance.  
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.  
Typical applicaTion  
V
Efficiency  
IN  
7V TO 60V  
TRANSIENT  
TO 80V  
90  
4.7µF  
V
V
IN2  
IN1  
V
= 5V  
OUT  
EN/UVLO  
TRACK/SS2  
85  
80  
75  
70  
65  
60  
55  
50  
1000pF  
15µH  
TRACK/SS1  
1000pF  
0.22µF  
RT  
V
= 3.3V  
OUT  
LT3988  
200k  
SYNC  
BD  
BOOST1  
BOOST2  
0.22µF  
22µH  
V
V
OUT2  
OUT1  
SW1  
SW2  
5V, 1A  
3.3V, 1A  
DA1  
FB1  
DA2  
FB2  
57.6k  
47µF  
34k  
V
f
= 12V  
= 500kHz  
IN  
GND  
SW  
10.2k  
10k  
47µF  
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9  
1
22pF  
I
(A)  
OUT  
3988 TA01b  
3988 TA01  
3988f  
1
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