LTC3788-1_1 LINER [Linear Technology], LTC3788-1_1 Datasheet - Page 26

• Manufacturer Part Number: LTC3788-1_1
• Description: 2-Phase, Dual Output Synchronous Boost Controller
• Manufacturer: LINER [Linear Technology]

APPLICATIONS INFORMATION
LTC3788-1
high current output loading at lower input voltages, look
for inductive coupling between C
MOSFET components to the sensitive current and voltage
sensing traces. In addition, investigate common ground
path voltage pickup between these components and the
SGND pin of the IC.
An embarrassing problem, which can be missed in an
otherwise properly working switching regulator results
26
C
15nF
ITH1
12.1k
0.1μF
C
R
220pF
C
SS1
A1
R
8.66k
ITH1
ITH1
R
232k
B1
CINA, COUTA1, COUTA2: SANYO, 50CE220AX
CINB, COUTB1, COUTB2: TDK C4532X5R1E226M
L1, L2: PULSE PA1494.362NL
MBOT1, MBOT2, MTOP1, MTOP2: RENESAS HAT2169H
*WHEN V
VFB1
ITH1
SS1
ITH2
PLLIN/MODE
SGND
EXTV
SENSE1
SENSE1
SS2
VFB2
RUN1
RUN2
FREQ
SENSE2
SENSE2
IN
< 8V, MAXIMUM LOAD CURRENT AVAILABLE IS REDUCED.
CC
LTC3788-1
–
+
+
–
IN
, Schottky and the top
PGOOD2
PGOOD1
BOOST2
BOOST1
Figure 9. High Effi ciency 2-Phase 24V Boost Converter
INTV
VBIAS
PGND
SW2
SW1
BG2
TG2
BG1
TG1
CC
100k
C
0.1μF
C
0.1μF
B1
B1
INTV
C
4.7μF
INT
CC
when the current sensing leads are hooked up backwards.
The output voltage under this improper hook-up will still
be maintained, but the advantages of current mode control
will not be realized. Compensation of the voltage loop will
be much more sensitive to component selection. This
behavior can be investigated by temporarily shorting out
the current sensing resistor—don’t worry, the regulator
will still maintain control of the output voltage.
MTOP1
MBOT1
MBOT2
MTOP2
3.3μH
3.3μH
L1
L2
R
R
SENSE1
4mΩ
SENSE2
4mΩ
37881 F09
C
22μF
C
22μF
C
22μF
OUTA1
4
INA
4
OUTA2
4
+
+
+
C
220μF
C
220μF
C
220μF
INB
OUTB1
OUTB2
V
5V TO 24V
IN
V
24V, 10A*
OUT
37881fa