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參數(shù)資料
| 型號： | LTC3525LESC6-3#PBF |
| 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： | LEAD FREE, PLASTIC, EIAJ, MO-203AB, SC-70, 6 PIN |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 487K |
| 代理商： | LTC3525LESC6-3#PBF |
LTC3525L-3
8
3525lfa
The maximum average load current that can be supported
is given by:
IO MAX
(
) =
0.3 VIN η
VO
Amps
where
η is the efficiency (see Typical Performance Char-
acteristics).
The “burst” frequency (how often the LTC3525L-3 deliv-
ers 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 LTC3525L-3 do not typically generate
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 efficiency. The inductor
should be a low-loss ferrite design and must be rated
for peak currents of at least 400mA without saturating.
InductorswithlowerDCresistancewillimproveefficiency.
Note that the inductor value does not have a significant
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.
Theoutputcapacitorshouldalsobeaceramic,locatedclose
to the VOUT and GND pins. A minimum value of 10F is
recommended.Increasingthevalueoftheoutputcapacitor
to 22F will result in lower output ripple. Higher capacitor
values will only offer a small reduction in output ripple,
while reducing light load efficiency 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.
OPERATION
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