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參數(shù)資料
| 型號(hào)： | LTC3525DESC6-3.3 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, PDSO6 |
| 封裝： | PLASTIC, MO-203AB, SC-70, 6 PIN |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大小： | 220K |
| 代理商： | LTC3525DESC6-3.3 |
LTC3525D-3.3
8
3525d33f
OPERATIO
U
The maximum average load current that can be supported
is given by:
I
V
Amps
O MAX
IN
O
() =
03
.
η
Where η is the efciency (see Typical Performance
Characteristics).
The “burst” frequency (how often the LTC3525D delivers
a burst of current pulses to the load) is determined by
the internal hysteresis (output voltage ripple), the load
current and the amount of output capacitance. All Burst
Mode operation or hysteretic converters will enter the
audible frequency range when the load is light enough.
However, due to the low peak inductor current at light load,
circuits using the LTC3525D do not typically generate any
audible noise.
Component Selection
Inductor values between 4.7H and 15H are recom-
mended. In most applications 10H will yield the best
compromise between size and efciency. The inductor
should be a low-loss ferrite design and must be rated
for peak currents of at least 400mA without saturating.
Inductors with lower DC resistance will improve efciency.
Note that the inductor value does not have a signicant
effect on ripple current, so while lower values will increase
the operating frequency, they do not reduce output volt-
age ripple.
Some recommended inductor examples are Murata
LQH32C, Coilcraft LPO4812, LPO3310, DO3314, DS1608
and MSS4020, Sumida CDRH2D14 and Taiyo Yuden
NR3015T.
A ceramic input bypass capacitor should be located as
close as possible to the VIN and GND pins of the IC. A
minimum value of 1F is recommended. If the battery is
more than a few inches away, a bulk tantalum decoupling
cap of at least 10F is recommended on VIN.
The output capacitor should also be a ceramic, located close
to the VOUT and GND pins. A minimum value of 10F is
recommended. Increasing the value of the output capacitor
to 22F will result in lower output ripple. Higher capacitor
values will only offer a small reduction in output ripple,
while reducing light load efciency by causing the peak
inductor current to increase above its minimum value of
150mA. The input and output capacitors should be X5R
or X7R types, not Y5V.
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