LTC3787
TYPICAL APPLICATION
I
IN
C
IN
12V
I
1
0°
I
I
PHASMD
BG1
TG1
1
2
BOOST: 24V, 5A
LTC3787
I
I
2
180°
90°
BG2
TG2
BOOST: 24V, 5A
BOOST: 24V, 5A
CLKOUT
+90°
I
I
3
4
24V, 20A
3
90,270
C
I
COUT
OUT
CLKOUT
PHASMD
BG1
TG1
LTC3787
I
4
I*
IN
270°
BG2
TG2
BOOST: 24V, 5A
I*
COUT
REFER TO FIGURE 15 FOR APPLICATION CIRCUITS
* RIPPLE CURRENT CANCELLATION INCREASES THE RIPPLE
FREQUENCY AND REDUCES THE RMS INPUT/OUTPUT RIPPLE
CURRENT, THUS SAVING INPUT/OUTPUT CAPACITORS
3787 F16
Figure ±6. PolyPhase Application
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LTC3788/LTC3788-1 Multiphase, Dual Output Synchronous Step-Up
Controller
4.5V (Down to 2.5V After Start-Up) ≤ V ≤ 38V, V
Up to 60V, 50kHz to
IN
OUT
900kHz Fixed Operating Frequency, 5mm × 5mm QFN-32, SSOP-28
LTC3786
Low IQ Synchronous Step-Up Controller
4.5V (Down to 2.5V After Start-Up) ≤ V ≤ 38V, V Up to 60V, 50kHz to
IN
OUT
900kHz Fixed Operating Frequency, 3mm × 3mm QFN-32, MSOP-16E
LTC3862/LTC3862-1 Multiphase, Dual Channel Single Output Current
Mode Step-Up DC/DC Controller
4V ≤ V ≤ 36V, 5V or 10V Gate Drive, 75kHz to 500kHz Fixed Operating
IN
Frequency, SSOP-24, TSSOP-24, 5mm × 5mm QFN-24
LT3757/LT3758
Boost, Flyback, SEPIC and Inverting Controller
2.9V ≤ V ≤ 40V/100V, 100kHz to 1MHz Fixed Operating Frequency,
IN
3mm × 3mm DFN-10 and MSOP-10E
LTC1871/LTC1871-1/ Wide Input Range, No R
Low Quiescent Current 2.5V ≤ V ≤ 36V, 50kHz to 1MHz Fixed Operating Frequency, I = 250ꢀA ,
SENSE
IN
Q
LTC1871-7
LTC3859
Flyback, Boost and SEPIC Controller
MSOP-10
Low I , Triple Output Buck/Buck/Boost Synchronous All Outputs Remain in Regulation Through Cold Crank, 4.5V (Down to
Q
DC/DC Controller
2.5V After Start-Up) ≤ V ≤ 38V, V
Up to 24V, V
OUT(BUCKS) OUT(BOOST)
IN
Up to 60V, I = 55ꢀA
Q
LTC3789
High Efficiency Synchronous 4-Switch Buck-Boost
DC/DC Controller
4V ≤ V ≤ 38V, 0.8V ≤ V
≤ 38V, 4mm × 5mm QFN-28 and SSOP-2
IN
OUT
3787fc
LT 0412 REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
36
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Linear Systems [ Linear Systems ]
