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LTC3788-1 PDF预览

LTC3788-1

更新时间: 2024-11-06 11:45:59
品牌 Logo 应用领域
Linear Systems 多相元件控制器
页数 文件大小 规格书
44页 829K
描述
Multi-Phase Current Mode Step-Up DC/DC Controller

LTC3788-1 数据手册

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LTC3862-2  
Multi-Phase Current Mode  
Step-Up DC/DC Controller  
FeaTures  
DescripTion  
n
Wide V Range: 5.5V to 36V Operation  
TheLTC®3862-2isatwo-phaseconstantfrequency,current  
mode boost and SEPIC controller that drives N-channel  
power MOSFETs. Two-phase operation reduces system  
filtering capacitance and inductance requirements.  
IN  
n
2-Phase Operation Reduces Input and Output  
Capacitance  
n
Fixed Frequency, Peak Current Mode Control  
n
Internal 10V LDO Regulator  
Theoperatingfrequencycanbesetwithanexternalresistor  
over a 75kHz to 500kHz range and can be synchronized  
to an external clock using the internal PLL. Multiphase  
operation is possible using the SYNC input, the CLKOUT  
output and the PHASEMODE control pin allowing 2-, 3-,  
4-, 6- or 12-phase operation.  
n
Lower UVLO Thresholds Allows the Use of  
MOSFETs Rated at 6V V  
GS  
n
n
n
n
n
Adjustable Slope Compensation Gain  
Adjustable Max Duty Cycle (Up to 96%)  
Adjustable Leading Edge Blanking  
1ꢀ Internal Voltage Reference  
Other features include an internal 10V LDO with under-  
voltage lockout protection for the gate drivers, a preci-  
sion RUN pin threshold with programmable hysteresis,  
soft-start and programmable leading edge blanking and  
maximum duty cycle.  
Programmable Operating Frequency with One  
External Resistor (75kHz to 500kHz)  
Phase-Lockable Fixed Frequency 50kHz to 650kHz  
SYNC Input and CLKOUT for 2-, 3-, 4-, 6- or  
12-Phase Operation (PHASEMODE Programmable)  
24-Lead Narrow SSOP Package  
n
n
n
n
n
+
PART NUMBER  
LTC3862  
INTV  
UV  
UV  
CC  
5mm × 5mm QFN Package with 0.65mm Lead Pitch  
24-Lead Thermally Enhanced TSSOP Package  
5V  
3.3V  
7.5V  
4.4V  
2.9V  
7.0V  
3.9V  
LTC3862-1  
LTC3862-2  
10V  
10V  
applicaTions  
L, LT, LTC, LTM, Linear Technology, the Linear logo and PolyPhase are registered trademarks  
and No R and ThinSOT are trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. Protected by U.S. Patents, including  
6144194, 6498466, 6611131.  
SENSE  
n
Automotive, Telecom and Industrial Power Supplies  
Typical applicaTion  
V
IN  
6V TO 32V  
22µF  
50V  
Efficiency vs Output Current  
100k  
16µH  
16µH  
V
OUT  
V
= 80V  
97  
95  
93  
91  
89  
87  
85  
83  
81  
79  
77  
OUT  
80V  
V
24.9k  
IN  
7A (MAX)  
RUN  
INTV  
GATE1  
+
SENSE1  
CC  
210µF  
100V  
4.7µF  
0.0033Ω  
LTC3862-2  
BLANK  
FREQ  
SYNC  
SENSE1  
110k  
GATE2  
+
SENSE2  
PLLFLTR  
0.1µF  
V
V
V
V
= 6V  
IN  
IN  
IN  
IN  
0.0033Ω  
= 9V  
SS  
= 12V  
= 24V  
SENSE2  
1nF  
3V8  
PGND  
CLKOUT  
SLOPE  
10  
100  
1000  
10000  
FB  
LOAD CURRENT (mA)  
10nF  
D
MAX  
38622 TA01b  
ITH  
PHASEMODE  
SGND  
12.1k  
796k  
12.4k  
220pF  
38622 TA01a  
38622f  
1

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LTC3788-1 - 2-Phase, Dual Output Synchronous Boost Controller; Package: SSOP; Pins: 28; Te