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LTC3890

更新时间： 2024-11-06 14:58:19
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
40页 786K
描述
60V 低 IQ双输出 2 相同步降压型 DC/DC 控制器

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中文翻译

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LTC3890 数据手册

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LTC3890  
60V Low I , Dual, 2-Phase  
Q
Synchronous Step-Down DC/DC Controller  
FEATURES  
DESCRIPTION  
The LTC®3890 is a high performance dual step-down  
switching regulator DC/DC controller that drives all  
N-channelsynchronouspowerMOSFETstages.Aconstant  
frequency current mode architecture allows a phase-  
lockable frequency of up to 850kHz. Power loss and noise  
due to the ESR of the input capacitor are minimized by  
operating the two controller output stages out-of-phase.  
n
Wide V Range: 4V to 60V (65V Abs Max)  
IN  
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n
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Low Operating I : 50µA (One Channel On)  
Q
Wide Output Voltage Range: 0.8V ≤ V  
≤ 24V  
OUT  
R
or DCR Current Sensing  
SENSE  
Out-of-Phase Controllers Reduce Required Input  
Capacitance and Power Supply Induced Noise  
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  
n
n
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The50μAno-loadquiescentcurrentextendsoperatingrun  
timeinbattery-poweredsystems.OPTI-LOOP® compensa-  
tion allows the transient response to be optimized over  
a wide range of output capacitance and ESR values. The  
LTC3890 features a precision 0.8V reference and power  
good output indicators. A wide 4V to 60V input supply  
range encompasses a wide range of intermediate bus  
voltages and battery chemistries.  
n
n
n
n
n
n
n
n
n
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Selectable Current Limit  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Power Good Output Voltage Monitors  
Output Overvoltage Protection  
Low Shutdown I : < 14µA  
Q
Independent TRACK/SS pins for each controller ramp the  
output voltages during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit conditions.  
ThePLLIN/MODEpinselectsamongBurstModeoperation,  
pulse-skipping mode, or continuous conduction mode at  
light loads. For a leaded package version (28-lead Narrow  
SSOP), see the LTC3890-1 data sheet.  
Internal LDO Powers Gate Drive from V or EXTV  
IN  
CC  
No Current Foldback During Start-Up  
Small Low Profile (0.75mm) 5mm × 5mm QFN Package  
AEC-Q100 Qualified for Automotive Applications  
APPLICATIONS  
n
Automotive Always-On Systems  
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. Patents, including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066,  
6580258, 7230497.  
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Battery Operated Digital Devices  
n
Distributed DC Power Systems  
TYPICAL APPLICATION  
High Efficiency Dual 8.5V/3.3V Output Step-Down Converter  
Efficiency and Power Loss  
V
vs Output Current  
IN  
9V TO 60V  
22µF  
ꢔꢊꢊꢊꢊ  
ꢔꢊꢊꢊ  
ꢔꢊꢊ  
ꢔꢊꢊ  
ꢗꢊ  
ꢖꢊ  
ꢓꢊ  
ꢜꢊ  
ꢙꢊ  
ꢚꢊ  
ꢕꢊ  
ꢛꢊ  
4.7µF  
ꢝ
ꢝ
ꢞ ꢔꢛꢝ  
ꢌꢆ  
ꢀꢁꢂ  
V
IN  
INTV  
CC  
ꢞ ꢕ.ꢕꢝ  
TG1  
TG2  
0.1µF  
0.1µF  
BOOST1  
SW1  
BOOST2  
SW2  
4.7µH  
8µH  
BG1  
BG2  
LTC3890  
PGND  
ꢔꢊ  
+
+
SENSE1  
SENSE1  
SENSE2  
0.01Ω  
0.008Ω  
ꢔ
–
–
V
SENSE2  
OUT2  
V
ꢔꢊ  
ꢊ
OUT1  
3.3V  
5A  
8.5V  
3A  
V
V
ITH2  
FB1  
FB2  
ꢊ.ꢔ  
100k  
100k  
10.5k  
ITH1  
ꢊ.ꢊꢊꢊꢔ ꢊ.ꢊꢊꢔ  
ꢊ.ꢊꢔ  
ꢊ.ꢔ  
ꢔ
ꢔꢊ  
470µF  
1000pF  
34.8k  
1000pF  
34.8k  
330µF  
ꢀꢁꢂꢃꢁꢂ ꢄꢁRRꢅꢆꢂ ꢇꢈꢉ  
TRACK/SS1 SGND TRACK/SS2  
0.1µF  
ꢕꢖꢗꢊ ꢂꢈꢊꢔꢘ  
31.6k  
0.1µF  
3890 TA01a  
Rev. D  
1
Document Feedback  
For more information www.analog.com  
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