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AN3302 Datasheet(PDF) 11 Page - STMicroelectronics

Part # AN3302
Description  Monolithic power management for high definition ODD with
PDF  13 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3302 Datasheet(HTML) 11 Page - STMicroelectronics

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AN3302
Test results
Doc ID 18163 Rev 1
11/13
The resistance RDC and low saturation current of this inductor have a strong impact on
efficiency and output voltage ripple.
Output voltage ripple depends on output capacitor ESR and by increasing the voltage rating
of the capacitor, as suggested by the BOM list, the switching ripple is minimized.
Figure 15.
Efficiency
Figure 16.
Inductor peak current
STODD01 Step-UP Section
Step-Up BOM Comparison on ST Board
Efficiency vs Load Current
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
290
300
310
320
330
340
350
360
370
380
390
400
410
Load Current [mA]
VCC = 4V
VCC =4.5V
VCC = 5V
L
1=4.7µH (LPS6225-472MLB)
C
4=22µF (GRM32ER61C226KE20L)
L
1=4.7µH (low Isat current)
C
4=22µF (LMK212BJ2226MD)
STODD01 Step-UP Section
Step-Up BOM Comparison on ST Board
Efficiency vs Load Current
70
72
74
76
78
80
82
84
86
88
90
92
94
96
98
100
290
300
310
320
330
340
350
360
370
380
390
400
410
Load Current [mA]
VCC = 4V
VCC =4.5V
VCC = 5V
L
1=4.7µH (LPS6225-472MLB)
C
4=22µF (GRM32ER61C226KE20L)
L
1=4.7µH (low Isat current)
C
4=22µF (LMK212BJ2226MD)
STODD01 Step-UP Section
Step-Up BOM Comparison on ST Board
Inductor Current vs Load Current
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
290
300
310
320
330
340
350
360
370
380
390
400
410
Load Current [mA]
VCC = 4V
VCC =4.5V
VCC = 5V
L
1=4.7µH (low Isat current )
C
4=22µF (LMK212BJ2226MD)
L
1=4.7µH (LPS6225-472MLB)
C
4=22µF (GRM32ER61C226KE20L)
STODD01 Step-UP Section
Step-Up BOM Comparison on ST Board
Inductor Current vs Load Current
0
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
290
300
310
320
330
340
350
360
370
380
390
400
410
Load Current [mA]
VCC = 4V
VCC =4.5V
VCC = 5V
L
1=4.7µH (low Isat current )
C
4=22µF (LMK212BJ2226MD)
L
1=4.7µH (LPS6225-472MLB)
C
4=22µF (GRM32ER61C226KE20L)
Figure 17.
Capacitive change vs. voltage C4
GRM32ER61C226KE20L
Figure 18.
Impedance/ESR characteristics C4
GRM32ER61C226KE20L



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