Datasheet

0 25 50 75 100125150175200225250
50
60
70
80
90
100
I
OUT
[mA]
EFFICIENCY [%]
100 mV/Div
100 mA/Div
TIME (200 µs/DIV)
I
O
V
OUT
ripple
5V/Div
50 mA/Div
TIME (5 ms/DIV)
I
O
V
OUT
2V/Div
V
IN
20 mV/Div
5V/Div
TIME (200 ns/DIV)
V
OUT
ripple
V
SW
Basic Application Circuit - LM2733X www.ti.com
5 Basic Application Circuit - LM2733X
Table 2. LM2733X Bill of Materials (V
IN
= 5V, V
OUT
= 12V, I
OUT
= 250mA)
Designation Description Size Manufacturer Part # Vendor
C1 Cap 2.2µF 16V 1206 EMK316BJ225ML Taiyo Yuden
C2 Cap 4.7µF 16V 1812 EMK432BJ475ML Taiyo Yuden
C3 Cap 220pF 50V 0805 VJ0805A221JXACW1BC Vishay
R1 RES, 51k Ohm, 5%, 0.1W 0805 CRCW080551K0JNEA Vishay
R2 RES, 118k Ohm, 1%, 0.1W 0805 CRCW0805118KFKEA Vishay
R3 RES, 13.3k Ohm, 1%, 0.1W 0805 CRCW080513K3FKEA Vishay
L1 Shielded Inductor 10µH 4A CDRH125-100MC Sumida
D1 Diode 20V 0.5A SOT23 MBR0520 International
Rectifier
U1 IC LM2733XMF Texas Instruments
Figure 7. Start Up Figure 8. Switching Waveform and
V
IN
= 5V, V
OUT
= 12V, I
OUT
= 250mA Output Voltage Ripple
V
IN
= 5V, V
OUT
= 12V, I
OUT
= 250mA
Figure 9. Load Transient Figure 10. Efficiency
V
IN
= 5V, V
OUT
= 12V, I
OUT
= 50mA to 200mA V
IN
= 5V, V
OUT
= 12V
4
AN-1280 LM2731/LM2733 Evaluation Board SNVA066B–April 2003–Revised April 2013
Submit Documentation Feedback
Copyright © 2003–2013, Texas Instruments Incorporated