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LTC3890-2

更新时间： 2024-11-05 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
44页 598K
描述
Triple Output, Buck/Buck/Boost Synchronous Controller with 28μA Burst Mode IQ

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LTC3890-2 数据手册

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LTC3859AL  
Triple Output,  
Buck/Buck/Boost Synchronous  
Controller with 28µA Burst Mode I  
Q
FeaTures  
DescripTion  
n
Low Operating I : 28μA (One Channel On)  
TheLTC®3859ALisahighperformancetripleoutput(buck/  
buck/boost) synchronous DC/DC switching regulator  
controllerthatdrivesallN-channelpowerMOSFETstages.  
Constant frequency current mode architecture allows  
a phase-lockable switching frequency of up to 850kHz.  
The LTC3859AL operates from a wide 4.5V to 38V input  
supply range. When biased from the output of the boost  
converter or another auxiliary supply, the LTC3859AL can  
operate from an input supply as low as 2.5V after start-up.  
Q
n
Dual Buck Plus Single Boost Synchronous Controllers  
n
Outputs Remain in Regulation Through Cold Crank  
Down to 2.5V  
n
Wide Bias Input Voltage Range: 4.5V to 38V  
n
Buck Output Voltage Range: 0.8V ≤ V  
Boost Output Voltage Up to 60V  
≤ 24V  
OUT  
n
n
n
R
or DCR Current Sensing  
SENSE  
100% Duty Cycle for Boost Synchronous MOSFET  
Even in Burst Mode® Operation  
The 28μA no-load quiescent current extends operating  
runtime 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 LTC3859AL features a precision 0.8V reference for  
the bucks, 1.2V reference for the boost and a power good  
output indicator. The PLLIN/MODE pin selects among  
Burst Mode operation, pulse-skipping mode, or continu-  
ous inductor current mode at light loads.  
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  
Very Low Buck Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
n
n
n
n
Low Shutdown I : 10μA  
Q
Small 38-Lead 5mm × 7mm QFN and TSSOP Packages  
Compared to the LTC3859 and the LTC3859A, the  
LTC3859AL is fully pin-compatible, but with lower Burst  
applicaTions  
n
Mode operation I (28µA with one channel on).  
Automotive Always-On and Start-Stop Systems  
Q
n
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP and µModule are registered trademarks and  
Battery Operated Digital Devices  
No R  
is a trademark of Linear Technology Corporation. All other trademarks are the  
SENSE  
n
Distributed DC Power Systems  
Multioutput Buck-Boost Applications  
property of their respective owners. Protected by U.S. Patents including 5481178, 5705919,  
5929620, 6144194, 6177787, 6580258.  
n
Typical applicaTion  
V
OUT3  
REGULATED AT 10V WHEN V < 10V  
IN  
220µF  
1µF  
Efficiency and Power Loss vs  
Output Current  
FOLLOWS V WHEN V > 10V  
IN  
IN  
499k  
V
BIAS  
V
FB3  
TG1  
68.1k  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
10000  
V
= 12V  
IN  
4.9µH  
V
5V  
5A  
6mΩ  
OUT1  
SW1  
BG1  
TG3  
1.2µH  
2mΩ  
V
IN  
V
= BURST  
OUT1  
EFFICIENCY  
1000  
100  
10  
2.5V TO 38V  
SW3  
LTC3859AL  
(START-UP ABOVE 5V)  
220µF  
BG3  
+
SENSE1  
SENSE1  
–
–
+
SENSE3  
SENSE3  
INTV  
V
FB1  
357k  
CC  
68.1k  
220µF  
RUN1, 2, 3  
EXTV  
CC  
V
= BURST LOSS  
OUT1  
4.7µF  
1
BOOST1, 2, 3  
V
OUT1  
0.1µF  
SW1, 2, 3  
TG2  
SW2  
BG2  
V
8.5V  
3A  
6.5µH  
OUT2  
8mΩ  
0.1  
0.0001 0.001  
0.01  
0.1  
1
10  
I
TH1, 2, 3  
OUTPUT CURRENT (A)  
3859al TA01b  
SENSE2+  
SENSE2–  
TRACK/SS1, 2  
SS3  
0.1µF  
V
FB2  
649k  
PGND SGND  
68.1k  
68µF  
3859al TA01a  
3859alf  
1
For more information www.linear.com/3859AL  
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