Datasheet

0402, 6.3V, X5R
0603, 10V, X5R
0 1.0 2.0 3.0 4.0 5.0
DC BIAS (V)
20
40
60
80
100
CAP VALUE (% of NOMINAL 1 PF)
LM10506
www.ti.com SNVS729E –SEPTEMBER 2011–REVISED MARCH 2013
• I
RIPPLE
: Peak-to-Peak inductor current
• V
OUT
: Output voltage
• V
IN
: Input voltage
• L: Inductor value in Henries at I
OUTMAX
• F: Switching frequency, Hertz
• D: Estimated duty factor
• EFF: Estimated power supply efficiency (2)
I
SAT
may not be exceeded during any operation, including transients, startup, high temperature, worst-case
conditions, etc.
Suggested Inductors and Their Suppliers
The designer should choose the inductors that best match the system requirements. A very wide range of
inductors are available as regarding physical size, height, maximum current (thermally limited, and inductance
loss limited), series resistance, maximum operating frequency, losses, etc. In general, smaller physical size
inductors will have higher series resistance (DCR) and implicitly lower overall efficiency is achieved. Very low-
profile inductors may have even higher series resistance. The designer should try to find the best compromise
between system performance and cost.
Table 3. Recommended Inductors
Value Manufacturer Part Number DCR Current Package
2.2 µH Murata LQH55PN2R2NR0L 31 mΩ 2.5A 2220
2.2 µH TDK NLC565050T-2R2K-PF 60 mΩ 1.3A 2220
2.2 µH Murata LQM2MPN2R2NG0 110 mΩ 1.2A 806
OUTPUT AND INPUT CAPACITORS CHARACTERISTICS
Special attention should be paid when selecting these components. As shown in the following figure, the DC bias
of these capacitors can result in a capacitance value that falls below the minimum value given in the
recommended capacitor specifications table. Note that the graph shows the capacitance out of spec for the 0402
case size capacitor at higher bias voltages. It is therefore recommended that the capacitor manufacturers’
specifications for the nominal value capacitor are consulted for all conditions, as some capacitor sizes (e.g.,
0402) may not be suitable in the actual application.
Figure 27. Typical Variation in Capacitance vs.
DC Bias
Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 29
Product Folder Links: LM10506