Datasheet

V
IN
V
OUT
C1
C9
R4
R3
R1
C8
C2
C4
D1
R2
C5
C3
LM20323
FB
AGND
SW
GND
GND
GND
U1
14
11
12
2
10
9
SW
13
SW
8
SW
7
BOOT
17
VIN
16
VIN
15
VIN
6
VIN
5
EP
COMP
4
SS
1
NC
20
PGOOD
3
EN
19
VCC
18
C7
L1
C6
V
OUT
PGOOD
ENABLE
GND
GND
C2, C3 should be placed at VIN
pins 5,6 and 15,16 respectively.
(OPTIONAL
for improved
Efficiency)
LM20323
SNVS557C –MAY 2008–REVISED APRIL 2013 www.ti.com
Figure 34. Typical Application Schematic
Table 4. Bill of Materials (V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 3A)
ID Qty Part Number Size Description Vendor
U1 1 LM20323MH HTSSOP IC, Switching Regulator TI
C1 1 C3225X5R1E226M 1210 22µF, X5R, 25V, 20% TDK
C2, C3 2 GRM21BR61E475KA12L 0805 4.7µF, X5R, 25V, 10% MuRata
C5, C6 1 C1608X7R1H104K 0603 100nF, X7R, 50V, 10% TDK
C4 1 C1608X5R1A105K 0603 1µF, X7R, 10V, 10% TDK
C7 1 C1608C0G1H100J 0603 10pF, C0G, 50V, 5% TDK
C8 1 C1608C0G1H102J 0603 1nF, C0G, 50V, 5% TDK
C9 1 6TPB150MAZB B 150µF,POSCAP, 6.3V, 20% Sanyo
D1 1 CMMSH1-40-NST SOD123 Vr = 40V, Io = 1A, Vf = 0.55V Central
Semiconductor
L1 1 IHLP4040DZER5R6M01 IHLP4040 5.6µH, 0.018 Ohms, 16A Vishay
R1, R4 2 CRCW06031002F 0603 10kΩ, 1% Vishay
R2 1 CRCW06034992F 0603 49.9kΩ, 1% Vishay
R3 1 CRCW06033092F 0603 30.9kΩ, 1% Vishay
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