ADP151 datasheet(27/47 Pages) AD

27 / 47 page

Data Sheet

LT3046

analog.com

Rev 0

27 of 47

Figure 70. Ceramic Capacitor DC Bias Characteristics

Figure 71. Ceramic Capacitor Temperature Characteristics

X5R and X7R dielectrics result in more stable characteristics and are thus more suitable for the LT3046. The X7R

dielectric has better stability across temperature, while the X5R is less expensive and is available in higher values.

Nonetheless, care must still be exercised when using X5R and X7R capacitors. The X5R and X7R codes only specify

operating temperature range and the maximum capacitance change over temperature. While capacitance changes

due to DC bias for X5R and X7R is better than Y5V and Z5U dielectrics, it can still be significant enough to drop

capacitance to below sufficient levels. As shown in Figure 72, capacitor DC bias characteristics tend to improve as

component case size increases. However, verification of expected capacitance at the operating voltage is highly

recommended. Due to its good voltage coefficient in small case sizes, Analog Devices recommends using the

Murata GCM series ceramic capacitors.

BOTH CAPACITORS ARE 16V

1210 CASE SIZE, 10µF

X5R

Y5V

DC BIAS VOLTAGE(V)

–100

–80

–60

–40

–20

BOTH CAPACITORS ARE 25V

1210 CASE SIZE, 10µF

X5R

Y5V

TEMPERATURE (°C)

–55

–35

–15

–100

–80

–60

–40

–20

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