LTC3788_15 Datasheet, PDF (32/32 Pages) Linear Technology – 2-Phase, Dual Output Synchronous Boost Controller

LTC3788
Typical Application
High Efficiency Dual 12V/24V Boost Converter
R_B1
232k
R_A1
12.1k
C_ITH1, 220pF
C_ITH1, 15nF
R_ITH1
8.66k
C_SS1, 0.1µF
C_SS2, 0.1µF
C_ITH2, 15nF
R_ITH2
2.7k
C_ITHA2, 100pF
R_A2
12.1k
R_B2
110k
SENSE1^–
SENSE1⁺
PGOOD2
PGOOD1
100k ^INTVCC
100k
LTC3788
VFB1
TG1
SW1
BOOST1
ITH1
BG1
SS1
ILIM
PHSMD
CLKOUT
PLLIN/MODE
SGND
EXTV_CC
RUN1
RUN2
FREQ
VBIAS
INTV_CC
PGND
BG2
BOOST2
C_B1, 0.1µF
D1
C_INT
4.7µF
D2
C_B1, 0.1µF
SS2
SW2
ITH2
TG2
VFB2
SENSE2⁺
SENSE2^–
C_INA, C_OUTA1, C_OUTA2: SANYO, 50CE220AX
C_INB, C_OUTB1, C_OUTB2: TDK C4532X5R1E226M
L1: PULSE PA1494.362NL
L2: PULSE PA1294.132NL
MBOT1, MBOT2, MTOP1, MTOP2: RENESAS HAT2169H
* WHEN V_IN = 8V, MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED. V_OUT2 FOLLOWS V_IN WHEN V_IN > 12V.
MTOP1
L1
3.3µH
R_SENSE1
4mΩ
MBOT1
MBOT2
L2
1.25µH
R_SENSE2
3mΩ
MTOP2
3788 TA02
C_OUTA1 ⁺
22µF
×4
V_OUT1
24V, 5A
C_OUTB1
220µF
C_INA ⁺
22µF
×4
V_IN
5V TO 24V
C_INB
220µF
C_OUTA2 ⁺
22µF
×4
V_OUT2
12V, 10A*
C_OUTB2
220µF
Related Parts
PART NUMBER
DESCRIPTION
COMMENTS
LTC3787/LTC3787-1 Multiphase, Dual Channel 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, 4mm × 5mm QFN-28, SSOP-28
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 Multiphase, Dual Channel Single Output 4V ≤ V_IN ≤ 36V, 5V or 10V Gate Drive, 75kHz to 500kHz Fixed Operating Frequency,
Current Mode Step-Up DC/DC Controller SSOP-24, TSSOP-24, 5mm × 5mm QFN-24
LTC3859A
LTC3789
Low I_Q, Triple Output Buck/Buck/Boost
Synchronous DC/DC Controller
High Efficiency Synchronous 4-Switch
Buck-Boost 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(BUCK) Up to 24V, V_OUT(BOOST) Up to 60V, I_Q = 55µA
4V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 38V, SSOP-28, 4mm × 5mm QFN-28, SSOP-28
3788fc
32 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
LT 0112 REV C • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2009