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LTC3788-1_1

更新时间： 2024-11-06 11:52:23
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
30页 360K
描述
2-Phase, Dual Output Synchronous Boost Controller

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LTC3788-1_1 数据手册

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LTC3788-1  
2-Phase, Dual Output  
Synchronous Boost Controller  
FEATURES  
DESCRIPTION  
The LTC®3788-1 is a high performance 2-phase dual  
synchronous boost converter controller that drives all  
N-channel power MOSFETs. Synchronous rectification  
increases efficiency, reduces power losses and eases  
thermal requirements, allowing the LTC3788-1 to be used  
in high power boost applications.  
n
Synchronous Operation for Highest Efficiency and  
Reduced Heat Dissipation  
n
Wide Input Range: 4.5V to 38V (40V Abs Max) and  
Operates Down to 2.5V After Start-Up  
Output Voltages Up to 60V  
±±1 ±.2V Reference Voltage  
n
n
n
R
or Inductor DCR Current Sensing  
SENSE  
A constant-frequency current mode architecture allows  
a phase-lockable frequency of up to 850kHz. OPTI-LOOP  
compensationallowsthetransientresponsetobeoptimized  
over a wide range of output capacitance and ESR values.  
The LTC3788-1 features a precision 1.2V reference and a  
power good output indicator. A 4.5V to 38V input supply  
range encompasses a wide range of system architectures  
and battery chemistries.  
n
n
n
n
n
n
n
n
n
±001 Duty Cycle Capability for Synchronous MOSFET  
Low Quiescent Current: 125μA  
Phase-Lockable Frequency (75kHz to 850kHz)  
Programmable Fixed Frequency (50kHz to 900kHz)  
Adjustable Output Voltage Soft-Start  
Power Good Output Voltage Monitor  
Low Shutdown Current I : <8ꢀA  
Internal LDO Powers Gate Drive from VBIAS or EXTV  
Available in a Narrow SSOP Package  
Q
CC  
Independent SS pins for each controller ramp the output  
voltages during start-up. The PLLIN/MODE pin selects  
among Burst Mode operation, pulse-skipping mode or  
continuous inductor current mode at light loads.  
APPLICATIONS  
n
Industrial  
Foraleadless32-pinQFNpackagewithadditionalfeatures  
of adjustable current limit, clock out, phase modulation  
and two PGOOD outputs, see the LTC3788 data sheet.  
n
Automotive  
n
Medical  
Military  
n
L, LT, LTC, LTM, Linear Technology, OPTI-LOOP, Burst Mode and the Linear logo are registered  
trademarks and No R  
and ThinSOT are trademarks of Linear Technology Corporation.  
SENSE  
All other trademarks are the property of their respective owners. Protected by U. S. Patents,  
including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258.  
V
4.5V TO 12V START-UP VOLTAGE  
IN  
OPERATES THROUGH TRANSIENTS DOWN TO 2.5V  
TYPICAL APPLICATION  
V
IN  
Efficiency and Power Loss  
vs Load Current  
4.7μF  
TG2  
4.7μF  
220μF  
3mΩ  
4mΩ  
100  
90  
10000  
1000  
100  
10  
TG1 VBIAS INTV  
BOOST1  
CC  
3.3μH  
1.25μH  
BOOST2  
SW2  
V
V
OUT  
12V AT 5A  
OUT  
24V AT 3A  
0.1μF  
80  
0.1μF  
SW1  
70  
LTC3788-1  
BG1  
BG2  
60  
50  
+
+
SENSE1  
SENSE2  
–
40  
30  
20  
10  
0
–
SENSE1  
SENSE2  
PGND  
VFB2  
V
V
= 12V  
IN  
OUT  
1
110k  
232k  
= 24V  
VFB1  
Burst Mode OPERATION  
FIGURE 9 CIRCUIT  
FREQ  
0.1  
PLLIN/MODE  
0.00001 0.0001 0.001 0.01  
0.1  
1
10  
OUTPUT CURRENT (A)  
ITH1 SS1 SGND SS2 ITH2  
37881 TA01b  
15nF  
220μF  
220μF  
15nF  
2.7k  
100pF  
220pF  
12.1k  
8.66k  
12.1k  
0.1μF  
0.1μF  
37881 TA01a  
37881fa  
1
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