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3 Additional Footprints
Additional component mounting pads are available to experiment with alternative Cin and Cout
combinations or a zener clamp on the enable input. for corresponding schematic locations, see Figure 6.
Figure 1. Evaluation Board Schematic
(LMZ12003 1.8V application values shown in parentheses)
Table 1. LMZ1420x Bill of Materials (BOM), V
IN
= 8V to 42V, V
OUT
= 3.3V, I
OUT (MAX)
= 3A / 2A / 1A
Designator Description Case Size Manufacturer Manufacturer P/N Quantity
U1 SIMPLE SWITCHER® PFM-7 Texas Instruments LMZ14203 or 1
LMZ14202 or
LMZ14201
C
IN4
, C
O1
1 µF, X7R, 50V 1206 Taiyo Yuden UMK316B7105KL-T 2
C
IN2
10 µF, X5R, 50V 1210 Taiyo Yuden UMK325BJ106MM-T 1
C
O2
100 µF, X5R, 6.3V 1210 Taiyo Yuden JMK325BJ107MM-T 1
C
SS
, C
FF
0.022 µF, X7R, 100V 0805 AVX 08051C223JAT2A 2
R
ENB
11.8k 0805 Panasonic ERJ-6ENF1182V 1
R
ENT
68.1 kΩ 0805 Panasonic ERJ-6ENF6812V 1
R
FBT
3.32 kΩ 0805 Vishay-Dale CRCW08053K32FKEA 1
R
FBB
1.07 kΩ 0805 Panasonic CRCW080534K8FKEA 1
R
ON
61.9 kΩ 0805 Panasonic ERJ-6ENF6192V 1
2
AN-2024 LMZ1420x / LMZ1200x Evaluation Board SNVA422E–January 2010–Revised April 2013
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