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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： | 11/12页 |
| 文件大小： | 235K |
| 代理商： | LTC3525LESC6-3TRM |
LTC3525L-3
8
3525lf
OPERATIO
U
Normal Operation
Once VOUT has increased more than 0.2V typical above
VIN, and either voltage is above 1.8V, normal operation
begins, with synchronous rectication enabled. In this
mode, the internal N-channel MOSFET connected between
SW and GND stays on until the inductor current reaches a
maximum peak value, after which it is turned off and the
P-channel synchronous rectier is turned on. It stays on,
delivering current to the output, until the inductor current
has dropped below a minimum value at which point it
turns off and the cycle repeats. When the output voltage
reaches its regulated value both switches are turned off
and the LTC3525L-3 goes to sleep, during which time the
output capacitor supplies current to the load. Once the
output voltage drops below the regulation value the IC
leaves sleep mode and switching is resumed.
The LTC3525L-3 has been designed for low output voltage
ripple. The output voltage ripple is typically only 20mV
peak-to-peak at light load and 60mV peak-to-peak at
full load using the minimum recommended 10F output
capacitor. An anti-ring circuit damps any oscillation at the
switch node when the inductor current falls to zero.
Power Adjust Feature
The LTC3525L-3 incorporates a feature that maximizes
efciency at light load while providing increased power
capability at heavy load by adjusting the peak and valley
of the inductor current as a function of load. Lowering the
peak inductor current to 150mA at light load optimizes
efciency by reducing conduction losses in the internal
MOSFET switches. As the load increases, the peak inductor
current is automatically increased to a maximum of 400mA.
At intermediate loads, the peak inductor current may vary
from 150mA to 400mA. Figure 1 shows an example of
how the inductor current changes as the load increases.
Please note that output capacitor values greater than 47F
will result in higher peak currents than necessary at light
load. This will lower the light load efciency.
The valley of the inductor current is automatically adjusted
as well, to maintain a relatively constant inductor ripple
current. This keeps the switching frequency relatively
constant.
3525 F01
INDUCTOR
CURRENT
100mA/DIV
LOAD
CURRENT
50mA/DIV
10
s/DIV
Figure 1. Inductor Current Changing as a Function of Load
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| LTC3525LESC6-3 | 0.45 A SWITCHING REGULATOR, PDSO6 |
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