Datasheet

R3
V (CH1)=
out
(R5+R2+R3)
xV (=1V)
ref
R24
V (CH2)=
out
(R21+R23+R24)
xV (=1V)
ref
www.ti.com Bill of Materials
5.7 Output Voltage Adjustment
Output voltage is programmable by changing R2, R3, and R5 for CH1 and R21, R23, and R24 for CH2.
Default setting is 5 V for CH1 and 3.3 V for CH2.
(1)
When V
out
(CH1) is set above 5 V, V5SW input resistor (R22) must be open.
(2)
6 Bill of Materials
Table 8. Bill of Materials
Reference Qty Description Size Mfr Part Number
C1, C14, C26 3 Capacitor, Ceramic, 10 nF, 50V, X7R, 20% 0603 Std Std
C2, C3 2 Capacitor, SPCAP, 150 μF, 6.3-V, 15-mΩ, 7343 Panasonic EEFCX0J151R
20%
C4, C5, C6, C21, 6 Capacitor, Ceramic, 0.1 μF, 50V, X7R, 20% 0603 TDK C1608X7R1H104K
C22, C23
C7, C16, C20, C27 4 Capacitor, Ceramic, 100 pF, 50V, CH, 5% 0603 TDK C1608CH1H101J
C8, C33 0 Capacitor, Ceramic, 10 μF, 25V, X7R, 20% 1210 – –
C9, C18, C19, C32 4 Capacitor, Ceramic, 10 μF, 25V, X7R , 20% 1210 Murata GRM32DR71E106KA
C10 1 Capacitor, Ceramic, 2.2 F, 6.3V, X7R (or 0603 Murata GRM188R70J225KA
X5R), 10% TDK C1608X5R0J225K
C11 0 Capacitor, Ceramic 0603 – –
C12 1 Capacitor, Ceramic, 47pF, 50V, CH, 5% 0603 TDK C1608CH1H470J
C13 1 Capacitor, Ceramic, 0.22 F, 50V, X7R, 10% 0630 TDK C1608X7R1E224K
C15 1 Capacitor, Ceramic, 10 F, 10V, X7R (or 0805 Murata GRM21BR71A106K
X5R), 10% TDK C2012X5R0J106K
C17 0 Capacitor, Ceramic 0603 – –
C24, C29 0 Capacitor 7343 – –
C25, C30 2 Capacitor, SPCAP, 220 F, 4-V, 15-mΩ, 20% 7343 Panasonic EEFCX0G221R
C28 0 Capacitor, Ceramic 0603 – –
C31 0 Capacitor, Ceramic 0603 – –
D1, D2 0 Diode 0.1 × 0.049 inch – –
L1 1 Inductor, 4.7μH, 10.2A, 12.9-mΩ 0.4 × 0.4 inch TOKO FDV1040-4R7M
L2 1 Inductor, 3.3μH, 10.7A, 10.5-mΩ 0.4 × 0.4 inch TOKO FDV1040-3R3M
Q1, Q3 2 MOSFET, N-ch, 30-V, 14-A, 9.7-mΩ SO8 TI CSD17307Q5A
Q2, Q4 2 MOSFET, N-ch, 30-V, 21-A, 4.5-mΩ SO8 TI CSD17310Q5A
R1, R4, R9, R17, 9 Resistor, Chip, 0Ω, 1/10W, 1% 0603 Std Std
R22, R34, R35,R36,
R37
R2 1 Resistor, Chip, 120kΩ, 1/10W, 1% 0603 Std Std
R3 1 Resistor, Chip, 30kΩ, 1/10W, 1% 0603 Std Std
R5, R23 2 Resistor, Chip 49.9 or 51Ω, 1/10W, 1% 0603 Std Std
R6 0 Resistor, Chip, mΩ, 1 W, 1% 3712 Std Std
R7, R25 0 Resistor, Chip 0603 Std Std
R8 1 Resistor, Chip, 7.5kΩ, 1/10W, 1% 0603 Std Std
R10 0 Resistor, Chip 0603 Std Std
R11, R14 2 Resistor, Chip, 470kΩ, 1/10W, 1% 0603 Std Std
R12, R13 2 Resistor, Chip, 10kΩ, 1/10W, 1% 0603 Std Std
R15 1 Resistor, Chip, 360kΩ, 1/10W, 1% 0603 Std Std
7
SLVU251A–June 2008–Revised May 2011 High-Performance Synchronous Buck EVM Using the TPS51220
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