Datasheet

LM21305SQ
23
24
25
26
27
28
13
12
11
10
9
8
1 2 3 4 5 6 7
21 20 19 18 17 16 15
23 14
PVIN
PVIN
CBOOT
5V0
AGND
AVIN
AVIN
PGND
PGND
PGND
COMP
PGOOD
FB
AGND
PGND SW SW SW SW PVIN PVIN
EN
FREQ
AGND AGND AGND AGND
2V5
U1
PGND
0
R7
7.15k
C6
4.7 nF
C5
NA
C8
1 PF
C3
1.0 PF
R4
100k
1%
C1
100 pF
SYNC
L1
3.3 PH
+
C15
N/A
+
C14
N/A
C12
47 PF
C11
47 PF
C9
10 PF
C10
10 PF
C13
47 PF tant
C7
0.1 PF
C4
1 PF
R8
1R
D1
N/A
2 1
J2
2
1
J3
C2
0.1 PF
3
2
1
JP1
AVIN_EXT
AVIN PVIN
TP3
PVIN
39«18V
POST
GND
TP8
TP9
AVIN_EXT
39«18V
POST POST POST
GND GND
VOUT = 3.3V
R5
45.3k
FB
10k
R6
VOUT
0.69«5V
SW
TP6TP5
GNDGND
TP4
TP7
EN
TP10
2
1
J1
PGOOD GND
TP1 TP2
R1
100k
OE
A
GND
VCC
Y
U2 NC7SZ125M5X
3
2
1
4
5
R2
249R
LD1
R3
10k
www.ti.com Evaluation Board Schematic
3 Evaluation Board Schematic
3
SNVA432C–March 2010–Revised May 2013 AN-2042 LM21305 Evaluation Board
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