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LT1963AES8 数据表(PDF) 15 Page - Linear Dimensions Semiconductor

部件名 LT1963AES8
功能描述  1.5A, Low Noise, Fast Transient Response LDO Regulators
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制造商  LINEAR_DIMENSIONS [Linear Dimensions Semiconductor]
网页  http://www.lineardimensions.com
标志 LINEAR_DIMENSIONS - Linear Dimensions Semiconductor

LT1963AES8 数据表(HTML) 15 Page - Linear Dimensions Semiconductor

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LT1963A Series
15
1963afe
POSCAP capacitors are used. The output voltage is at the
worst case value of 1.2V. Trace A, is with a 10µF ceramic
output capacitor and shows significant ringing with a peak
amplitude of 25mV. For Trace B, a 22µF/45mΩ POSCAP
is added in parallel with the 10µF ceramic. The output is
well damped and settles to within 10mV in less than 20µs.
For Trace C, a 100µF/35mΩ POSCAP is connected in
parallel with the 10µF ceramic capacitor. In this case the
peak output deviation is less than 20mV and the output
settles in about 10µs. For improved transient response
the value of the bulk capacitor (tantalum or aluminum
electrolytic) should be greater than twice the value of the
ceramic capacitor.
Tantalum and Polytantalum Capacitors
There is a variety of tantalum capacitor types available,
with a wide range of ESR specifications. Older types have
ESRspecificationsinthehundredsofmΩtoseveralOhms.
Some newer types of polytantalum with multi-electrodes
have maximum ESR specifications as low as 5mΩ. In gen-
eral the lower the ESR specification, the larger the size and
the higher the price. Polytantalum capacitors have better
surge capability than older types and generally lower ESR.
Some types such as the Sanyo TPE and TPB series have
ESR specifications in the 20mΩ to 50mΩ range, which
provide near optimum transient response.
Aluminum Electrolytic Capacitors
Aluminumelectrolyticcapacitorscanalsobeusedwiththe
LT1963A.Thesecapacitorscanalsobeusedinconjunction
with ceramic capacitors. These tend to be the cheapest
and lowest performance type of capacitors. Care must be
used in selecting these capacitors as some types can have
ESR which can easily exceed the 3Ω maximum value.
Ceramic Capacitors
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior over
temperature and applied voltage. The most common
dielectrics used are Z5U, Y5V, X5R and X7R. The Z5U and
Table 1. Capacitor Minimum ESR
VOUT
10µF
22µF
47µF
100µF
1.2V
20mΩ
15mΩ
10mΩ
5mΩ
1.5V
20mΩ
15mΩ
10mΩ
5mΩ
1.8V
15mΩ
10mΩ
10mΩ
5mΩ
2.5V
5mΩ
5mΩ
5mΩ
5mΩ
3.3V
0mΩ
0mΩ
0mΩ
5mΩ
≥5V
0mΩ
0mΩ
0mΩ
0mΩ
Figures 3 through 8 show the effect of ESR on the transient
response of the regulator. These scope photos show the
transientresponsefortheLT1963Aatthreedifferentoutput
voltageswithvariouscapacitorsandvariousvaluesofESR.
The output load conditions are the same for all traces. In
all cases there is a DC load of 500mA. The load steps up
to 1A at the first transition and steps back to 500mA at
the second transition.
At the worst case point of 1.2VOUT with 10µF COUT
(Figure 3), a minimum amount of ESR is required. While
20mΩ is enough to eliminate most of the ringing, a value
closer to 50mΩ provides a more optimum response. At
2.5V output with 10µF COUT (Figure 4) the output rings
at the transitions with 0Ω ESR but still settles to within
10mV in 20µs after the 0.5A load step. Once again a small
value of ESR will provide a more optimum response.
At 5VOUT with 10µF COUT (Figure 5) the response is well
damped with 0Ω ESR.
With a COUT of 100µF at 0Ω ESR and an output of 1.2V
(Figure 6), the output rings although the amplitude is
only 20mVp-p. With COUT of 100µF it takes only 5mΩ to
20mΩ of ESR to provide good damping at 1.2V output.
Performanceat2.5Vand5Voutputwith100µFCOUTshows
similar characteristics to the 10µF case (see Figures 7-8).
At2.5VOUT5mΩto20mΩcanimprovetransientresponse.
At 5VOUT the response is well damped with 0Ω ESR.
CapacitortypeswithinherentlyhigherESRcanbecombined
with 0mΩ ESR ceramic capacitors to achieve both good
high frequency bypassing and fast settling time. Figure
9 illustrates the improvement in transient response that
can be seen when a parallel combination of ceramic and
applicaTions inForMaTion


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