LM10506 datasheet(31/43 Pages) TI2

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0402, 6.3V, X5R

0603, 10V, X5R

1.0

2.0

3.0

4.0

5.0

DC BIAS (V)

100

LM10506

www.ti.com

SNVS729F – SEPTEMBER 2011 – REVISED AUGUST 2014

9.2.2.3.2.2.1

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 4. Recommended Inductors

VALUE (µH)

MANUFACTURER

PART NUMBER

DCR (m

Ω)

CURRENT (A)

PACKAGE

2.2

Murata

LQH55PN2R2NR0L

2.5

2220

2.2

TDK

NLC565050T-2R2K-PF

1.3

2220

2.2

Murata

LQM2MPN2R2NG0

110

1.2

806

2.2

Coilcraft

LPS3015-222MLB

110

2.0

3015

2.2

Vishay

IFSC-1008AB-ER-2R2

2.15

2520

9.2.2.3.2.3

Output And Input Capacitors Characteristics

Special attention should be paid when selecting these components. As shown in Figure 26, 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 (for example, 0402) may not

be suitable in the actual application.

Figure 26. Typical Variation In Capacitance vs.

DC Bias

The ceramic capacitor’s capacitance can vary with temperature. The capacitor type X7R, which operates over a

temperature range of

−55°C to 125°C, will only vary the capacitance to within ±15%. The capacitor type X5R has

a similar tolerance over a reduced temperature range of

−55°C to 85°C. Many large value ceramic capacitors,

larger than 1 µF are manufactured with Z5U or Y5V temperature characteristics. Their capacitance can drop by

more than 50% as the temperature varies from 25°C to 85°C. Therefore X7R is recommended over Z5U and

Y5V in applications where the ambient temperature will change significantly above or below 25°C.

Tantalum capacitors are less desirable than ceramic for use as output capacitors because they are more

expensive when comparing equivalent capacitance and voltage ratings in the 0.47 µF to 44 µF range. Another

important consideration is that tantalum capacitors have higher ESR values than equivalent size ceramics. This

means that while it may be possible to find a tantalum capacitor with an ESR value within the stable range, it

would have to be larger in capacitance (which means bigger and more costly) than a ceramic capacitor with the

same ESR value. It should also be noted that the ESR of a typical tantalum will increase about 2:1 as the

temperature goes from 25°C down to

−40°C, so some guard band must be allowed.

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