Unless otherwise specified the following
conditions apply: VIN = 12 V, TA = 25°C. The circuit is shown
in Figure 9-31, with the
appropriate BOM from Table 9-3 or Table 9-4.
![Efficiency GUID-F345A078-6A5D-4E02-AAE1-24DB7F6E6CC3-low.png](/ods/images/SNVSAW1E/GUID-F345A078-6A5D-4E02-AAE1-24DB7F6E6CC3-low.png)
VOUT = 5
V |
400
kHz |
DDA
Package |
Figure 9-7 Efficiency![Efficiency GUID-FF2016AA-13DA-46E7-B9EA-2E3C493FE7D7-low.png](/ods/images/SNVSAW1E/GUID-FF2016AA-13DA-46E7-B9EA-2E3C493FE7D7-low.png)
VOUT = 5
V |
1.4
MHz |
DDA
Package |
Figure 9-9 Efficiency![Efficiency GUID-74D0EDBC-FF0E-442C-9176-D953F75DE072-low.png](/ods/images/SNVSAW1E/GUID-74D0EDBC-FF0E-442C-9176-D953F75DE072-low.png)
VOUT = 5
V |
2.1
MHz |
DDA
Package |
Figure 9-11 Efficiency![Efficiency GUID-F2F3DFB4-8D48-409E-8743-274DB0431447-low.png](/ods/images/SNVSAW1E/GUID-F2F3DFB4-8D48-409E-8743-274DB0431447-low.png)
VOUT = 5
V |
400
kHz |
RNX
Package |
Figure 9-13 Efficiency![Efficiency GUID-87A412E0-CB0F-4023-B283-4AC9F0DFBB4D-low.png](/ods/images/SNVSAW1E/GUID-87A412E0-CB0F-4023-B283-4AC9F0DFBB4D-low.png)
VOUT = 5
V |
1.4
MHz |
RNX
Package |
Figure 9-15 Efficiency![Efficiency GUID-4A6BA5A4-5745-4443-8D7C-1499EC62CBBB-low.png](/ods/images/SNVSAW1E/GUID-4A6BA5A4-5745-4443-8D7C-1499EC62CBBB-low.png)
VOUT = 5
V |
2.1
MHz |
RNX
Package |
Figure 9-17 Efficiency
Figure 9-19 Line
and Load Regulation
Figure 9-21 Mode
Change Thresholds![Load
Transient GUID-73797D11-E2E2-4F95-8B2E-5ABF10372168-low.gif](/ods/images/SNVSAW1E/GUID-73797D11-E2E2-4F95-8B2E-5ABF10372168-low.gif)
VIN = 12 V |
|
VOUT = 5
V |
tf = tr
= 2 µs |
IOUT = 0 A to 2 A |
Figure 9-23 Load
Transient
Figure 9-25 Line
and Load Regulation![Mode
Change Thresholds GUID-8BA29B07-6040-4C0B-8158-BCEC0F7C0019-low.png](/ods/images/SNVSAW1E/GUID-8BA29B07-6040-4C0B-8158-BCEC0F7C0019-low.png)
VOUT = 3.3
V |
ƒSW = 400 kHz |
Figure 9-27 Mode
Change Thresholds![Load
Transient GUID-21B51A4E-1CC0-4227-B817-53E6DE5D9387-low.gif](/ods/images/SNVSAW1E/GUID-21B51A4E-1CC0-4227-B817-53E6DE5D9387-low.gif)
VIN = 12 V |
|
VOUT = 3.3
V |
tf = tr
= 2 µs |
IOUT = 0 A to 2 A |
Figure 9-29 Load
Transient![Efficiency GUID-700E717A-7971-4C69-9132-0266B161DCE4-low.png](/ods/images/SNVSAW1E/GUID-700E717A-7971-4C69-9132-0266B161DCE4-low.png)
VOUT = 3.3
V |
400
kHz |
DDA
Package |
Figure 9-8 Efficiency![Efficiency GUID-257881C2-EC1A-44E6-BBD2-E8E35317D385-low.png](/ods/images/SNVSAW1E/GUID-257881C2-EC1A-44E6-BBD2-E8E35317D385-low.png)
VOUT = 3.3
V |
1.4
MHz |
DDA
Package |
Figure 9-10 Efficiency![Efficiency GUID-782F26D3-25AA-4AA8-9417-2BC6D94CC013-low.png](/ods/images/SNVSAW1E/GUID-782F26D3-25AA-4AA8-9417-2BC6D94CC013-low.png)
VOUT = 3.3
V |
2.1 MHz |
DDA Package |
Figure 9-12 Efficiency![Efficiency GUID-59EEE69E-D55A-494E-924D-6B25B150E871-low.png](/ods/images/SNVSAW1E/GUID-59EEE69E-D55A-494E-924D-6B25B150E871-low.png)
VOUT = 3.3
V |
400
kHz |
RNX
Package |
Figure 9-14 Efficiency![Efficiency GUID-DAFF0737-CED4-467A-A7F5-608CC5D6A7EA-low.png](/ods/images/SNVSAW1E/GUID-DAFF0737-CED4-467A-A7F5-608CC5D6A7EA-low.png)
VOUT = 3.3
V |
1.4
MHz |
RNX
Package |
Figure 9-16 Efficiency![Efficiency GUID-4BA967E9-D13B-4E9B-BC2C-40CB163D4A13-low.png](/ods/images/SNVSAW1E/GUID-4BA967E9-D13B-4E9B-BC2C-40CB163D4A13-low.png)
VOUT = 3.3
V |
2.1 MHz |
RNX Package |
Figure 9-18 Efficiency![Input
Supply Current GUID-D1860B17-E49A-4DCB-B808-AF0AF707A413-low.png](/ods/images/SNVSAW1E/GUID-D1860B17-E49A-4DCB-B808-AF0AF707A413-low.png)
VOUT = 5
V |
RFBT = 1
MΩ |
IOUT = 0
A |
Figure 9-20 Input
Supply Current
Figure 9-22 Switching Frequency versus Output Current![Load
Transient GUID-774173B5-AD49-4CDB-8543-FE1970F73CA8-low.gif](/ods/images/SNVSAW1E/GUID-774173B5-AD49-4CDB-8543-FE1970F73CA8-low.gif)
VIN = 12 V |
|
VOUT = 5
V |
tf = tr
= 2 µs |
IOUT = 1 A to 2 A |
Figure 9-24 Load
Transient![Input
Supply Current GUID-D8AFB934-105A-497A-9598-4266421D36B1-low.png](/ods/images/SNVSAW1E/GUID-D8AFB934-105A-497A-9598-4266421D36B1-low.png)
VOUT = 3.3
V |
IOUT = 0
A |
RFBT = 1
MΩ |
Figure 9-26 Input
Supply Current![Switching Frequency versus Output Current GUID-C95F2C7A-E827-415B-9958-6A0A49BDFC02-low.png](/ods/images/SNVSAW1E/GUID-C95F2C7A-E827-415B-9958-6A0A49BDFC02-low.png)
VOUT = 3.3
V |
ƒSW = 400 kHz |
Figure 9-28 Switching Frequency versus Output Current![Load
Transient GUID-1A8E9AD2-9A28-4775-AB74-D4AB7FEFC39F-low.gif](/ods/images/SNVSAW1E/GUID-1A8E9AD2-9A28-4775-AB74-D4AB7FEFC39F-low.gif)
VIN = 12 V |
VOUT = 3.3
V |
IOUT = 1 A to 2
A |
tf = tr = 2 µs |
|
Figure 9-30 Load
Transient
Figure 9-31 Circuit for Application CurvesTable 9-3 BOM for Typical Application
Curves DDA Package
VOUT(1) |
FREQUENCY |
RFBB |
COUT |
CIN +
CHF |
L |
U1 |
3.3 V |
400 kHz |
43.3 kΩ |
4 × 22 µF |
1 × 10 µF + 1 × 220 nF |
6.8 µH, 14 mΩ |
LMR33620ADDA |
3.3 V |
1400 KHz |
43.3 kΩ |
4 × 22 µF |
1 × 10 µF + 1 × 220 nF |
2.2 µH, 11.4 mΩ |
LMR33620BDDA |
3.3 V |
2100 kHz |
43.3 kΩ |
4 × 22 µF |
1 × 10 µF + 1 × 220 nF |
1.2 µH, 16 mΩ |
LMR33620CDDA |
5 V |
400 kHz |
24.9 kΩ |
4 × 22 µF |
1 × 10 µF + 1 × 220 nF |
8.2 µH, 14 mΩ |
LMR33620ADDA |
5 V |
1400 KHz |
24.9 kΩ |
4 × 22 µF |
1 × 10 µF + 1 × 220 nF |
2.2 µH, 11.4 mΩ |
LMR33620BDDA |
5 V |
2100 kHz |
24.9 kΩ |
4 × 22 µF |
1 × 10 µF + 1 × 220 nF |
1.5 µH, 8.2 mΩ |
LMR33620CDDA |
(1) The values in this table were selected to enhance certain performance criteria
and may not represent typical values.
Table 9-4 BOM for Typical Application
Curves RNX Package
VOUT(1) |
FREQUENCY |
RFBB |
COUT |
CIN +
CHF |
L |
U1 |
3.3 V |
400 kHz |
43.3 kΩ |
4 × 22 µF |
2 × 4.7 µF + 2 × 100 nF |
4.7 µH, 28 mΩ |
LMR33620ARNX |
3.3 V |
1400 KHz |
43.3 kΩ |
4 × 22 µF |
2 × 4.7 µF + 2 × 100 nF |
2.2 µH, 11.4 mΩ |
LMR33620BRNX |
3.3 V |
2100 kHz |
43.3 kΩ |
4 × 22 µF |
2 × 4.7 µF + 2 × 100 nF |
2.2 µH, 11.4 mΩ |
LMR33620CRNX |
5 V |
400 kHz |
24.9 kΩ |
4 × 22 µF |
2 × 4.7 µF + 2 × 100 nF |
6.8 µH, 14 mΩ |
LMR33620ARNX |
5 V |
1400 KHz |
24.9 kΩ |
4 × 22 µF |
2 × 4.7 µF + 2 × 100 nF |
2.2 µH, 11.4 mΩ |
LMR33620BRNX |
5 V |
2100 kHz |
24.9 kΩ |
4 × 22 µF |
2 × 4.7 µF + 2 × 100 nF |
2.2 µH, 11.4 mΩ |
LMR33620CRNX |
(1) The values in this table were selected to enhance certain performance criteria
and may not represent typical values.