Datasheet

C1
0.1uF
R1
100k
C4
2.2uF
C3
0.1uF
Q1
4
5
1 - 3
4
5
1 - 3
FDMS8680
Q2
FDMS8670AS
4
5
1 - 3
Q3
FDMS8670AS
L1
0.45uH
C7
5x330uF
C8
12x22uF
C5
C6
4x10uF
/25V
0.1uF
/50V
R4
0
R3
0
R2
200k
C2
0.01uF
VSNS
GSNS
REFIN
V5
DL
DH
2
3
4
12
9
10
1
VREF SW
11
U1
TPS51219
PGND
GND
TRIP
COMP
EN
MODE
PGOOD
PwPd
17 16 15 14 13
5 6 7 8
BST
R5
36k
VIN
Vout
EN
V5IN
8V to 20V
1.05V/20A
4.5V to 5.5V
Vout_GND
3.3V
R6
10
C9
1nF
R7
10
C10
1nF
TPS51219
www.ti.com SLUSAG1B –MARCH 2011– REVISED OCTOBER 2011
1.05-V/20-A, D-CAP™ 400-kHz, R
DS(on)
Sensing Application Circuit
Figure 34. 1.05-V/20-A, D-CAP™ 400-kHz, R
DS(on)
Sensing
Table 4. 1.05-V/20-A, D-CAP™ 400-kHz, R
DS(on)
Sensing, List of Materials
REFERENCE
QTY SPECIFICATION MANUFACTURE PART NUMBER
DESIGNATOR
C6 4 10 µF, 25 V Taiyo Yuden TMK325BJ106MM
C7 5 330 µF, 2.5 V, 18 mΩ Sanyo 2R5TPE330MI
C8 12 22 µF, 6.3 V Murata GRM21BB30J226ME38
L1 1 0.45 µH, 17 A, 1.1 mΩ Panasonic ETQP4LR45XFC
Q1 1 30 V, 35 A, 8.5 mΩ Fairchild FDMS8680
Q2,Q3 2 30 V, 42 A, 3.5 mΩ Fairchild FDMS8670AS
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