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LTC3788IUH

更新时间： 2024-11-06 05:43:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
32页 422K
描述
2-Phase, Dual Output Synchronous Boost Controller

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LTC3788IUH 数据手册

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LTC3788  
2-Phase, Dual Output  
Synchronous Boost Controller  
FEATURES  
DESCRIPTION  
The LTC®3788 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 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 features a precision 1.2V reference and dual  
power good output indicators. 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
n
±001 Duty Cycle Capability for Synchronous MOSFET  
Low Quiescent Current: 125μA  
Phase-Lockable Frequency (75kHz to 850kHz)  
Programmable Fixed Frequency (50kHz to 900kHz)  
Selectable Current Limit  
Adjustable Output Voltage Soft-Start  
Power Good Output Voltage Monitors  
Low Shutdown Current I : <8ꢀA  
Internal LDO Powers Gate Drive from VBIAS or EXTV  
Thermally Enhanced Low Profile 32-Pin 5mm × 5mm  
QFN Package  
Q
Independent SS pins for each controller ramp the output  
CC  
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  
For a leaded 28-lead SSOP package with a fixed current  
limit and one PGOOD output, without phase modulation  
or a clock output, see the LTC3788-1 data sheet.  
n
Industrial  
n
Automotive  
L, LT, LTC, LTM, Linear Technology, Burst Mode, OPTI-LOOP, PolyPhase and the Linear logo  
n
Medical  
are registered trademarks and No R  
and ThinSOT are trademarks of Linear Technology  
SENSE  
Corporation. All other trademarks are the property of their respective owners. Protected by  
U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258.  
n
Military  
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 Output 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  
80  
0.1μF  
0.1μF  
SW1  
70  
LTC3788  
BG1  
BG2  
60  
50  
+
+
SENSE1  
SENSE2  
40  
30  
20  
10  
0
–
–
SENSE1  
SENSE2  
RUN1  
PGND  
V
V
= 12V  
IN  
OUT  
110k  
1
= 24V  
RUN2  
VFB2  
VFB1  
232k  
Burst Mode OPERATION  
FIGURE 9 CIRCUIT  
PGOOD1  
FREQ  
PLLIN/MODE  
EXTV  
0.1  
CC  
0.00001 0.0001 0.001 0.01  
0.1  
1
10  
OUTPUT CURRENT (A)  
ITH1 SS1 SGND SS2 ITH2  
3788 TA01b  
15nF  
220μF  
220μF  
15nF  
2.7k  
100pF  
0.1μF  
220pF  
12.1k  
8.66k  
12.1k  
0.1μF  
3788 TA01a  
3788f  
1
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