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LT1534C Datasheet

  • LT1534C

  • Linear Technology [Ultralow Noise 2A Switching Regulators]

  • LINER

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LT1534/LT1534-1
APPLICATIONS INFORMATION
Input Capacitor
The ESR of this capacitor acts with high frequency current
components to produce much of the conducted noise of
the switcher. Values of 1碌F to 47碌F are typical with ESR
less than 0.3鈩? Place the capacitor close to the IC and
inductor.
The input capacitor can see a high surge current when a
battery of high capacitance source is connected 鈥渓ive.鈥?/div>
Some solid tantalum capacitors can fail under this con-
dition. Several manufacturers have developed a line of
solid tantalum capacitors specially tested for surge capa-
bility (e.g., AVX TPS series). However, even these units
may fail if the input voltage approaches the maximum
voltage rating of the capacitor. AVX recommends derat-
ing capacitor voltage by 2:1 for high surge applications.
Output Filter Capacitor
Output capacitors are usually chosen on the basis of ESR
since this will determine output ripple. However, low ESR
is also needed for low output noise and this will typically
be the tougher requirement. Typically required ESR will be
less than 0.2鈩?. Typical capacitance values are in the 47碌F
to 500碌F range. Again keep connection length as short as
possible. Table 1 shows some typical surface mount
capacitors.
Table 1
SIZE
E CASE
D CASE
CAPACITOR
AVX TPS, Sprague 593D
AVX TAJ
AVX TPS, Sprague 593D
AVX TAJ
Panasonic CD
C CASE
B CASE
AVX TPS
AVX TAJ
AVX TAJ
ESR (MAX
鈩?
0.1 to 0.3
0.7 to 0.9
0.1 to 0.3
0.9 to 2.0
0.05 to 0.18
0.2 (Typ)
1.8 to 3.0
2.5 to 10
12
U
W
U
U
Fast Voltage Slew Edges
A very fast voltage slew under certain operating conditions
may produce ringing on the COL voltage waveform. While
there is small harmonic energy in this, it can be eliminated
by placing an RC network of 10鈩?in series with 1000pF
from the COL pin to ground.
Switching Diodes
In general, switching diodes should be Schottky diodes
such as 1N5817-19 or MBR320-330.
Choosing the Inductor
For a boost converter, inductor selection involves trade-
offs of size, maximum output power, transient response
and filtering characteristics. Higher inductor values pro-
vide more output power and lower input ripple. However,
they are physically larger and can impede transient re-
sponse. Low inductor values have high magnetizing cur-
rent, which can reduce maximum power and increase
input current ripple.
The following procedure can be used to handle these
trade-offs:
1. Assume that the average inductor current for a boost
converter is equal to load current times V
OUT
/V
IN
and
decide whether the inductor must withstand continu-
ous overload conditions. If average inductor current at
maximum load current is 0.5A, for instance, a 0.5A
inductor may not survive a continuous 1.5A overload
condition. Also be aware that boost converters are not
short-circuit protected, and under output short condi-
tions, only the available current of the input supply
limits inductor current.

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