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LTC3859EUHF-TRPBF PDF预览

LTC3859EUHF-TRPBF

更新时间： 2024-10-02 05:43:59
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
40页 592K
描述
Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller

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LTC3859EUHF-TRPBF 数据手册

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LTC3859  
Low I , Triple Output,  
Q
Buck/Buck/Boost  
Synchronous Controller  
FEATURES  
DESCRIPTION  
The LTC®3859 is a high performance triple output (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  
LTC3859 operates from a wide 4.5V to 38V input supply  
range.Whenbiasedfromtheoutputoftheboostconverter  
or another auxiliary supply, the LTC3859 can operate from  
an input supply as low as 2.5V after start-up.  
n
Dual Buck Plus Single Boost Synchronous Controllers  
n
Outputs Remain in Regulation Through Cold Crank  
Down to 2.5V  
n
Low Operating I : 55μA (One Channel On)  
Wide Bias Input Voltage Range: 4.5V to 38V  
Buck Output Voltage Range: 0.8V ≤ V  
Boost Output Voltage Up to 60V  
Q
n
n
n
n
n
n
n
n
≤ 24V  
OUT  
R
or DCR Current Sensing  
SENSE  
100% Duty Cycle for Boost Synchronous MOSFET  
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  
The 55μA 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 LTC3859 features a precision 0.8V reference for the  
bucks, 1.2V reference for the boost and a power good  
output indicator.  
n
n
n
n
Very Low Buck Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Low Shutdown I : 14μA  
Small 38-Pin 5mm × 7mm QFN and TSSOP Packages  
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.  
The PLLIN/MODE pin selects among Burst Mode opera-  
tion,pulse-skippingmode,orcontinuousinductorcurrent  
mode at light loads.  
APPLICATIONS  
n
Automotive Always-On and Start-Stop Systems  
n
Battery Operated Digital Devices  
n
Distributed DC Power Systems  
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP and ꢀModule are registered trademarks and  
No R  
is a trademark of Linear Technology Corporation. All other trademarks are the  
SENSE  
property of their respective owners. Protected by U.S. Patents including 5481178, 5705919,  
5929620, 6144194, 6177787, 6580258.  
TYPICAL APPLICATION  
V
OUT3  
REGULATED AT 10V WHEN V < 10V  
IN  
220ꢀF  
1ꢀF  
FOLLOWS V WHEN V > 10V  
IN  
IN  
499k  
V
BIAS  
Efficiency vs Input Voltage  
V
TG1  
FB3  
68.1k  
100  
4.9ꢀH  
V
5V  
5A  
6mΩ  
OUT1  
V
OUT2  
= 8.5V  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
TG3  
SW3  
SW1  
BG1  
1.2ꢀH  
2mΩ  
V
IN  
V
= 5V  
OUT1  
2.5V TO 38V  
LTC3859  
(START-UP ABOVE 5V)  
220ꢀF  
BG3  
+
SENSE1  
SENSE1  
–
+
–
SENSE3  
SENSE3  
INTV  
V
FB1  
357k  
CC  
68.1k  
220ꢀF  
RUN1, 2, 3  
EXTV  
4.7ꢀF  
BOOST1, 2, 3  
CC  
0.1ꢀF  
FIGURE 12 CIRCUIT  
SW1, 2, 3  
I
= 2A  
TG2  
SW2  
BG2  
LOAD  
V
8.5V  
3A  
6.5ꢀH  
OUT2  
8mΩ  
I
TH1, 2, 3  
0
5
10 15 20 25 30 35 40  
INPUT VOLTAGE (V)  
3859 TA01b  
SENSE2+  
SENSE2–  
TRACK/SS1, 2  
SS3  
0.1ꢀF  
V
FB2  
649k  
PGND SGND  
68.1k  
68ꢀF  
3859 TA01  
3859f  
1
1234567...40

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