LM3530UME-25A/NOPB National Semiconductor, LM3530UME-25A/NOPB Datasheet - Page 36

• Manufacturer Part Number: LM3530UME-25A/NOPB
• Description: IC LED DRVR PRGRAM I2C 10LED SMD
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3530UME-25A/NOPB

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 500kHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 12-XFBGA
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: Adjustable
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Other names: LM3530UME-25A/NOPBTR

www.national.com
DIODE SELECTION
The diode connected between SW and OUT must be a Schot-
tky diode and have a reverse breakdown voltage high enough
to handle the maximum output voltage in the application.
BOARD LAYOUT GUIDELINES
The LM3530 contains an inductive boost converter which
sees a high switched voltage (up to 40V) at the SW pin, and
a step current (up to 900mA) through the Schottky diode and
output capacitor each switching cycle. The high switching
voltage can create interference into nearby nodes due to
electric field coupling (I = CdV/dt). The large step current
Manufacturer
Coilcraft
Coilcraft
Coilcraft
Coilcraft
Coilcraft
Coilcraft
TOKO
TDK
TDK
TDK
TDK
TDK
Manufacturer
Diodes Inc
Diodes Inc
On Semiconductor
On Semiconductor
Part Number
VLF3014ST-100MR82
VLF3010ST-220MR34
VLF3010ST-100MR53
VLF4010ST-100MR80
VLS252010T-100M
LPS3008-103ML
LPS3008-223ML
LPS3010-103ML
LPS3010-223ML
XPL2010-103ML
EPL2010-103ML
DE2810C-1117AS-100M
Part Number
B0540WS
SDM20U40
NSR0340V2T1G
NSR0240V2T1G
TABLE 13. Suggested Inductors
TABLE 14. Suggested Diodes
Value
10µH
22µH
10µH
10µH
10µH
10µH
22µH
10µH
22µH
10µH
10µH
10µH
Ta-
36
2.8mm × 3mm × 1.4mm
2.8mm × 3mm × 1mm
2.8mm × 3mm × 1mm
2.8mm × 3mm × 1mm
2.5mm × 2mm × 1mm
1.9mm × 2mm × 1mm
3mm × 3.2mm × 1mm
Value
Schottky
Schottky
Schottky
Schottky
2.95mm × 2.95mm ×
2.95mm × 2.95mm ×
2.95mm × 2.95mm ×
2.95mm × 2.95mm ×
2mm × 2mm × 1mm
ble 14
For 25V OVP devices a 30V Schottky is adequate. For 40V
OVP devices, a 40V Schottky diode should be used.
through the diode and the output capacitor can cause a large
voltage spike at the SW pin and the OVP pin due to parasitic
inductance in the step current conducting path (V = Ldi/dt).
Board layout guidelines are geared towards minimizing this
electric field coupling and conducted noise.
lights these two noise generating components.
0.8mm
0.8mm
0.9mm
0.9mm
Size
lists various diodes that can be used with the LM3530.
Size
SOD-323 ()
SOD-523
(1.2mm ×
0.8mm ×
0.6mm)
SOD-523
(1.2mm ×
0.8mm ×
0.6mm)
SOD-523
(1.2mm ×
0.8mm ×
0.6mm)
Rating
820mA
340mA
530mA
800mA
650mA
520mA
340mA
550mA
360mA
610mA
470mA
600mA
Rating
40V/500mA
40V/200mA
40V/250mA
40V/250mA
DC Resistance
0.25Ω
0.81Ω
0.41Ω
0.25Ω
0.71Ω
0.65Ω
0.54Ω
0.56Ω
0.91Ω
0.46Ω
Figure 26
1.5Ω
1.2Ω
high-