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LTC3890-3 PDF预览

LTC3890-3

更新时间： 2024-11-05 12:25:47
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
40页 1277K
描述
60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

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LTC3890-3 数据手册

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LTC3890-3  
60V Low I , Dual, 2-Phase  
Q
Synchronous Step-Down  
DC/DC Controller  
DescripTion  
FeaTures  
The LTC®3890-3 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-  
lockablefrequencyofupto850kHz.Powerlossandsupply  
noiseareminimizedbyoperatingthetwocontrolleroutput  
stages out-of-phase.  
n
Wide V Range: 4V to 60V (65V Abs Max)  
IN  
n
Low Operating I : 50µA (One Channel On)  
Q
n
n
n
Wide Output Voltage Range: 0.8V ≤ V  
≤ 24V  
OUT  
R
or DCR Current Sensing  
SENSE  
Out-of-Phase Controllers Reduce Input Capacitance  
and Power Supply Induced Noise  
n
n
n
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  
The50μAno-loadquiescentcurrentextendsoperatinglife  
in battery-powered systems. OPTI-LOOP® compensation  
allows the transient response to be optimized over a wide  
range of output capacitance and ESR values. 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
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Power Good Output Voltage Monitor  
Low Shutdown I : <14µA  
Q
Independent TRACK/SS pins for each controller ramp the  
outputvoltagesduringstart-up.Currentmodecontrollimits  
the inductor current during short-circuit conditions. The  
PLLIN/MODE pin selects among Burst Mode operation,  
pulse-skipping mode, or continuous conduction mode at  
light loads.  
Internal LDO Powers Gate Drive from V or EXTV  
Narrow SSOP Package  
IN  
CC  
applicaTions  
n
Automotive Always-On Systems  
n
Battery Operated Digital Devices  
n
For versions with different and/or additional features, see  
theLTC3890familysummary, Table1, inthePinFunctions  
section of this data sheet.  
Distributed DC Power Systems  
L, LT, LTC, LTM, Linear Technology, Burst Mode, OPTI-LOOP, PolyPhase and the Linear logo  
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, 6100678, 6144194, 6177787, 6304066, 6580258, 7230497.  
Typical applicaTion  
High Efficiency Dual 8.5V/3.3V Output Step-Down Converter  
Efficiency and Power Loss  
vs Output Current  
V
IN  
9V TO 60V  
10000  
1000  
100  
100  
90  
80  
70  
60  
50  
40  
30  
20  
22µF  
V
V
= 12V  
IN  
OUT  
4.7µF  
= 3.3V  
V
INTV  
CC  
IN  
TG1  
TG2  
0.1µF  
0.1µF  
BOOST1  
SW1  
BOOST2  
SW2  
4.7µH  
8µH  
BG1  
BG2  
LTC3890-3  
10  
PGND  
+
+
SENSE1  
SENSE2  
1
0.01Ω  
100k  
0.008Ω  
10  
0
–
–
V
8.5V  
3A  
SENSE2  
OUT2  
SENSE1  
V
OUT1  
3.3V  
5A  
0.1  
10  
V
V
FB1  
FB2  
0.0001 0.001  
0.01  
0.1  
1
100k  
470µF  
ITH1  
ITH2  
OUTPUT CURRENT (A)  
1000pF  
34.8k  
1000pF  
330µF  
TRACK/SS1 SGND TRACK/SS2  
0.1µF  
38903 TA01b  
10.5k  
31.6k  
34.8k  
0.1µF  
38903 TA01a  
38903f  
1
For more information www.linear.com/3890-3  
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