0

1.0

2.0

_

3.0

_

4.0

_

5.0

_

DC BIAS (V)

100%

80%

60%

40%

_

20%

_

0402, 6.3V, X5R

0603, 10V, X5R

LP3923

SNVS567B – APRIL 2010 – REVISED MAY 2013

www.ti.com

Figure 6. Graph Showing A Typical Variation in Capacitance vs DC Bias

Ceramic capacitors have the lowest ESR values, thus making them best for eliminating high frequency noise.

The ESR of a typical 1 µF ceramic capacitor is in the range of 10 m

Ω to 40 mΩ, and also meets the ESR

requirement for stability.

The temperature performance of ceramic capacitors varies by type. Capacitor type X7R is specified with a

tolerance of ±15% over the temperature range –55°C to +125°C. The X5R has a similar tolerance over the

reduced temperature range of –55°C to +85°C. Most large value ceramic capacitors (

≥ 2.2 µF) are manufactured

with Z5U or Y5V temperature characteristics, which results in the capacitance dropping by more than 50% as the

temperature goes from +25°C to +85°C. Therefore X7R is recommended over these other capacitor types in

applications where the temperature will change significantly above or below +25°C.

No-Load Stability

The LDOs on the LP3923 will remain stable and in regulation with no external load.

Symbol

Parameter

Type

Typ

Min

Max

Units

Capacitance

X5R, X7R

1.0

0.7

2.2

µF

Capacitance

X5R, X7R

1.0

0.7

2.2

µF

Capacitance

X5R, X7R

1.0

0.7

2.2

µF

Capacitance

X5R, X7R

1.0

0.7

2.2

µF

Capacitance

X5R, X7R

1.0

0.7

2.2

µF

Capacitance

X5R, X7R

1.0

0.7

2.2

µF

Capacitance

X5R, X7R

1.0

0.7

2.2

µF

Capacitance

X5R, X7R

1.0

0.7

2.2

µF

(1)

The capacitor tolerance should be 30% or better over the full temperature range. X7R, or X5R capacitors should be used. These

specifications are given to ensure stability of the supply outputs and care must be taken to ensure that the capacitance remains within

these values over all conditions within the application. See Capacitor Characteristics section in Application Information.

26

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