Datasheet

0 50 100150200250300350400450500
50
60
70
80
90
100
EFFICIENCY [%]
I
OUT
[mA]
100 mV/Div
100 mA/Div
TIME (200 µs/DIV)
I
O
V
OUT
ripple
2V/Div
200 mA/Div
TIME (2 ms/DIV)
I
O
V
OUT
1V/Div
V
IN
50 mV/Div
2V/Div
TIME (500 ns/DIV)
V
OUT
ripple
V
SW
www.ti.com Basic Application Circuit - LM2731Y
6 Basic Application Circuit - LM2731Y
Table 3. LM2731Y Bill of Materials (V
IN
= 3.3V, V
OUT
= 5V, I
OUT
= 500mA
Designation Description Size Manufacturer Part # Vendor
C1 Cap 2.2µF 16V 1206 EMK316BJ225ML Taiyo Yuden
C2 Cap 22µF 16V 1812 EMK432BJ226ML Taiyo Yuden
C3 Cap 470pF 50V 0805 VJ0805A471JXAMX Vishay
R1 RES, 51k Ohm, 5%, 0.1W 0805 CRCW080551K0JNEA Vishay
R2 RES, 40.2k Ohm, 1%, 0.1W 0805 CRCW08054022F Vishay
R3 RES, 13.3k Ohm, 1%, 0.1W 0805 CRCW080513K3FKEA Vishay
L1 Shielded Inductor 4.7µH 1.68A NRS6012T6R8MMGJ Taiyo Yuden
D1 Diode 20V 0.5A SOT23 MBR0520 International
Rectifier
U1 IC LM2731YMF Texas Instruments
Figure 11. Start Up Figure 12. Switching Waveform and
V
IN
= 3.3V, V
OUT
= 5V, I
OUT
= 500mA Output Voltage Ripple
V
IN
= 3.3V, V
OUT
= 5V, I
OUT
= 500mA
Figure 13. Load Transient Figure 14. Efficiency
V
IN
= 3.3V, V
OUT
= 5V, I
OUT
= 200mA to 400mA V
IN
= 3.3V, V
OUT
= 5V
5
SNVA066B–April 2003–Revised April 2013 AN-1280 LM2731/LM2733 Evaluation Board
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