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LM5161 Buck EVM Bill of Materials
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12 SNVU504A – August 2016 – Revised August 2016
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LM5161 Buck EVM User’s Guide
6 LM5161 Buck EVM Bill of Materials
Table 3. LM5161 Buck EVM Bill of Materials for 300 kHz Configuration
ITEM MFR MFG. PART NUMBER PACKAGE VALUE
C4, C6 MuRata GRM31CR72A225KA73L 1206 CAP, CERM, 2.2 µF, 100V, X7R
C5 MuRata GRM188R72A104KA35D 0603 CAP, CERM, 0.1 µF, 100V, X7R
C9 MuRata GRM188R71C223KA01D 0603 CAP, CERM, 0.022 µF, 16V, ± 10%, X7R
C1 MuRata GRM188R71C103KA01D 0603 CAP, CERM, 0.01 µF, 16V, ± 10%, X7R
C13 MuRata GRM188R71E105KA12D 0603 CAP, CERM, 1 µF, 25V, ± 10%, X7R
C11,
C12
TDK C3216X7R1E106M160AE 1206 CAP CER 10 µF, 25V, X7R
JP1 Wurth Elektronik 61300311121 Header, 2.54 mm, 3x1, Gold, TH
J3, J4 Wurth Elektronik 61300211121 Header, 2.54 mm, 2x1, Gold, TH
J1, J2 Phoenix Contact 1727010 Conn Term Block, 2POS, 3.81mm, TH
L2
Eaton DR125-101-R
12.5 mm x 12.5
mm x 6 mm
Fixed Ind 100 µH, 1.78A , 170 m Ω
Wurth Elektronik
(Alternative Part)
784770101
12.5 mm x 12.5
mm x 8 mm
Fixed Ind 100 µH, 2.1A , 144 m
Ω
R1 Vishay-Dale CRCW0603402KFKEA 0603 RES, 402 k, 1%, 0.1 W
R2 Vishay-Dale CRCW06030000Z0EA 0603 RES, 0, 5%, 0.1 W
R3 Vishay-Dale CRCW060375K0FKEA 0603 RES, 75.0 k, 1%, 0.1 W
R4 Vishay-Dale CRCW08050000Z0EA 0805 RES, 0, 5%, 0.125 W
R9 Vishay-Dale CRCW06036K81FKEA 0603 RES, 6.81 k, 1%, 0.1 W
R6 Vishay-Dale CRCW0603100KFKEA 0603 RES, 100 k, 1%, 0.1 W
R7 Vishay-Dale CRCW060310K0FKEA 0603 RES, 10.0 k, 1%, 0.1 W
R8 Vishay-Dale CRCW06032K00FKEA 0603 RES, 2.00k, 1%, 0.1W
U1 Texas Instruments LM5161PWPR
4.4 mm x 5.0 mm
HTSSOP-14
C7 MuRata GRM188R72A102KA01D 0603 CAP, CERM, 1000 pF, 100 V, ± 10%, X7R
C10
MuRata (Unpopulated
if FPWM = 0)
GCM188R71H104KA57D 0603 CAP, CERM, 0.1 µF, 50 V, ± 10%, X7R
D1 Diodes Inc. SD103AWS-7-F SOD-323 Diode, Schottky, 40V, 0.35A
7 LM5161 Buck EVM PCB Layout
Figure 21 to Figure 24 show the board layout details for the LM5161 Buck EVM. When using the LM5161
in FPWM with Type 3 external ripple injection circuit, the ESR resistor (R4) must be substituted with a 0 Ω
resistor) and the placeholders for the R6, C7 and C10 must be populated appropriately. The oscilloscope
snapshots in the
Section 4 are captured with C10 set at 0.01µF. If using the Type 1 external ripple
injection circuit, the ESR resistor (R4) must be calculated and placed correctly. However, when using the
R4 resistor, C10 must be removed. The resistor R2 can remain as a 0
Ω resistor in both the external ripple
injection circuit cases.
When using the LM5161 in the DCM mode (FPWM = 0) there is no need for the ESR resistor or the
external ripple injection circuit as mentioned earlier. However, it is recommended to set R2 (> 3
Ω
) in
series with the BST capacitor (see Figure 21 ), in order to protect the internal VCC-BST bootstrap diode
during a full load transient.