LTC3769
32
3769fa
For more information www.linear.com/LTC3769
LINEAR TECHNOLOGY CORPORATION 2014
LT 0915 REV A • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC3769
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LTC3784 2-Phase Single Output Synchronous Boost Controller 4.5V ≤ V
IN
≤ 60V, V
OUT
Up to 60V, 50kHz to 900kHz, 4mm × 5mm
QFN-28 and SSOP-28 Packages
LTC3788/L
TC3788-1 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
LTC3787 2-Phase Single Output Synchronous Boost Controller
4.5V ≤ V
IN
≤ 38V, V
OUT
Up to 60V, 50kHz to 900kHz, 4mm × 5mm
QFN-28 and SSOP-28 Packages
LTC3786 Low I
Q
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/
LTC3862-2
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
LTC3859AL 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
= 28µA
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-28
LT8705 80V V
IN
and V
OUT
Synchronous 4-Switch Buck-Boost
DC/DC Controller
V
IN
Range: 2.8V (Need EXTV
CC
> 6.4V) to 80V, V
OUT
Range: 1.3V to 80V,
Four Regulation Loops
LTC3890/LTC3890-1/
LTC3890-2/LTC3890-3
60V, Low I
Q
, Dual 2-Phase Synchronous Step-Down
DC/DC Controller
Phase-Lockable Fixed Frequency 50kHz to 900kHz, 4V ≤ V
IN
≤ 60V,
0.8V ≤ V
OUT
≤ 24V, I
Q
= 50μA
Figure 14. High Efficiency 48V/2.5A Boost Converter
SENSE
+
SENSE
–
TG
C
B
0.1µF
C
ITHA
100pF
LTC3769
C
SS
0.1µF
C
ITH
15nF
C
IN
4.7µF
×3
MTOP
MBOT
D
C
INT
4.7µF
3769 F14
V
OUT
48V
2.5A*
V
OUT
FOLLOWS V
IN
WHEN V
IN
> 48V
V
IN
5V TO 55V
R
SENSE
3mΩ
L
10µH
BOOST
SW
VBIAS
BG
GND
PGND
PGOOD
INTV
CC
VFB
ITH
SS
R
A
12.1k
100k
100k
R
ITH
15k
R
B
475k
FREQ
RUN
PLLIN/MODE
OVMODE
EXTV
CC
C
OUTA
4.7µF
×5
C
OUTB
33µF
×2
+
C
IN
, C
OUTA
: TDK C3225X7S2A475M
C
OUTB
: SUNCON 63HVH33M
D: BAS170W
L: SER2918H-103
MBOT, MTOP: BSC028N06L53
*WHEN V
IN
< 13V, MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED.
30.1k
