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參數(shù)資料
| 型號： | LTC3672BEDC-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 2 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, DFN-8 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 167K |
| 代理商： | LTC3672BEDC-1#PBF |
LTC3672B-1
8
3672B1f
OPERATION
LOW DROPOUT LINEAR REGULATORS (LDOS)
The LTC3672B-1 contains two 150mA xed-output LDO
regulators. LDO1 takes power from the VIN1 pin and regu-
lates a 1.2V output at the LDO1 pin. By connecting VIN1
to the buck regulator’s 1.8V output, overall conversion
efciency can be improved, because the bulk of the step-
down will be done by the buck regulator at higher efciency
than what the LDO can do on its own. For example, for
the case of deriving a 1.2V output from a 3.6V input (e.g.
Lithium-Ion battery nominal voltage), using an LDO to
do all of the step-down results in an efciency of at most
1.2V/3.6V = 33.3%, using the fact that the upper-bound on
any linear regulator’s efciency is output voltage divided by
input voltage. Feeding the LDO from the output of the buck
regulator, with a typical buck efciency of 85%, raises the
ceiling on overall efciency to 85% 1.2V/1.8V = 56.6%.
This can increase battery life by up to 70%!
LDO2 takes power straight from VIN and regulates a 2.8V
output at the LDO2 pin.
For stability, each LDO output must be bypassed to ground
with a minimum 1μF ceramic capacitor.
APPLICATIONS INFORMATION
BUCK REGULATOR INDUCTOR SELECTION
Many different sizes and shapes of inductors are avail-
able from numerous manufacturers. Choosing the right
inductor from such a large selection of devices can be
overwhelming, but following a few basic guidelines will
make the selection process much simpler.
The buck regulator is designed to work with inductors in
the range of 2.2μH to 10μH. A 4.7μH inductor is a good
starting point. Larger value inductors reduce ripple cur-
rent, which improves output ripple voltage. Lower value
inductors result in higher ripple current and improved
transient response time. To maximize efciency, choose
an inductor with a low DC resistance. Choose an inductor
with a DC current rating at least 1.5 times larger than the
maximum load current to ensure that the inductor does
not saturate during normal operation. If output short circuit
is a possible condition, the inductor should be rated to
handle the maximum peak current specied for the step-
down converters.
Different core materials and shapes will change the size/cur-
rent and price/current relationship of an inductor. Toroid
or shielded pot cores in ferrite or Permalloy materials
are small and don’t radiate much energy, but generally
cost more than powdered iron core inductors with similar
electrical characteristics. Inductors that are very thin or
have a very small volume typically have much higher core
and DCR losses, and will not give the best efciency. The
choice of which style inductor to use often depends more
on the price vs size, performance, and any radiated EMI
requirements than on what the buck regulator needs to
operate.
Table 1 shows several inductors that work well with the
buck regulator. These inductors offer a good compromise
in current rating, DCR and physical size. Consult each
manufacturer for detailed information on their entire
selection of inductors.
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