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参数资料
| 型号： | LTC3525LESC6-3TRM |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, PDSO6 |
| 封装： | PLASTIC, MO-203AB, SC-70, 6 PIN |
| 文件页数： | 12/12页 |
| 文件大小： | 235K |
| 代理商： | LTC3525LESC6-3TRM |
LTC3525L-3
9
3525lf
OPERATIO
U
The maximum average load current that can be supported
is given by:
I
V
Amps
O MAX
IN
O
() =
03
.
η
Where is the efciency (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
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. Induc-
tors 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 voltage
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.
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3525LESC6-3 | 0.45 A SWITCHING REGULATOR, PDSO6 |
| LTC3526BEDC-2 | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3526EDC | 0.5 A SWITCHING CONTROLLER, 1300 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3526BEDC | 0.5 A SWITCHING CONTROLLER, 1300 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3526LBEDC-2#PBF | SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO6 |
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| LTC3526BEDC | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm X 2mm DFN |
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