Datasheet

32
LTC1703
1703fa
TYPICAL APPLICATIO S
U
Complete 2-Step Notebook Power Supply (Continued on the Next Page)
D1 TO D7: MOTOROLA
[phone]
Q1 TO Q5, QT1A/1B, QB1A/1B:
INTERNATIONAL RECTIFIER
(310) 22-3331
QT2, QB2: FAIRCHILD
[phone]
L1, L2, L3: PANASONIC
[phone]
L4, L5: COILTRONICS
[phone]
1 2 3 4 5 6 7 8 9
10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
RUN/SS1 SENSE1
+
SENSE1
–
V
OSENSE1
FREQSET STBYMD FCB I
TH1
SGND 3.3V
OUT
I
TH2
V
OSENSE2
SENSE2
–
SENSE2
+
FLTCPL
TG1
SW1
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
SW2
TG2
RUNSS2
LTC1628
+
+
+
5VENABLE STBYMD STDBY3.3V STDBY5V 3.3VENABLE
0.1µF
0.1µF
0.1µF
330pF
330pF
33k
56pF
56pF
33k
1000pF
0.1µF
0.1µF
D2 CMDSH-3
1µF
0.01µF
4.7µF
D1 CMDSH-3
0.22µF
Q5
IRF7807
Q4
IRF7807
D4 MBRS130T3
L2
4.6µH
ETQP6F4R6H
D3 MBRD835L
Q3
IRF7805
Q2
IRF7805
Q1 IRF7805
L1
2.9µH
ETQP6F2R9L
0.1µF
50V
10Ω
0.004Ω
150µF
6V
× 2
180µF
4V
0.1µF
50V
22µF
50V
V
IN
7V TO 20V
V
OUT1
5V 4A
105k
1%
20.0k
1%
20.0k
1%
63.4k
1%
100pF
100pF
47pF
47pF
10µF
6.3V
10µF
6.3V
V
OUT2
3.3V 5A
1703 TA03
0.1µF
50V
1000pF
TO POINT A
0.01Ω