LTC3787
36
3787fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2010
LT 0412 REV C • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LTC3788/LTC3788-1 Multiphase, Dual Output Synchronous Step-Up
Controller
4.5V (Down to 2.5V After Start-Up) ≤ V
IN
≤ 38V, V
OUT
Up to 60V, 50kHz to
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
IN
≤ 38V, V
OUT
Up to 60V, 50kHz to
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
IN
≤ 36V, 5V or 10V Gate Drive, 75kHz to 500kHz Fixed Operating
Frequency, SSOP-24, TSSOP-24, 5mm × 5mm QFN-24
LT3757/LT3758 Boost, Flyback, SEPIC and Inverting Controller 2.9V ≤ V
IN
≤ 40V/100V, 100kHz to 1MHz Fixed Operating Frequency,
3mm × 3mm DFN-10 and MSOP-10E
LTC1871/LTC1871-1/
LTC1871-7
Wide Input Range, No R
SENSE
Low Quiescent Current
Flyback, Boost and SEPIC Controller
2.5V ≤ V
IN
≤ 36V, 50kHz to 1MHz Fixed Operating Frequency, I
Q
= 250µA ,
MSOP-10
LTC3859 Low I
Q
, Triple Output Buck/Buck/Boost Synchronous
DC/DC Controller
All Outputs Remain in Regulation Through Cold Crank, 4.5V (Down to
2.5V After Start-Up) ≤ V
IN
≤ 38V, V
OUT(BUCKS)
Up to 24V, V
OUT(BOOST)
Up to 60V, I
Q
= 55µA
LTC3789 High Efficiency Synchronous 4-Switch Buck-Boost
DC/DC Controller
4V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 38V, 4mm × 5mm QFN-28 and SSOP-2
Figure 16. PolyPhase Application
TG1
BG1
0°
I
1
I
1
I
2
I
3
I
4
BOOST: 24V, 5A
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
PHASMD
LTC3787
CLKOUT
C
IN
12V
24V, 20A
TG2
BG2
180°
I
2
BOOST: 24V, 5A
TG1
BG1
90°
90,270
+90°
I
3
BOOST: 24V, 5A
PHASMD
LTC3787
CLKOUT
TG2
BG2
270°
I
4
BOOST: 24V, 5A
C
OUT
I
COUT
I
IN
I*
IN
I*
COUT
