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參數(shù)資料
| 型號： | LT3483 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Inverting Micropower DC/DC Converter with Schottky in ThinSOT Package |
| 中文描述： | 反向微功率DC / DC變換器的ThinSOT封裝的肖特基 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 150K |
| 代理商： | LT3483 |
5
LT3483
3483f
APPLICATIU
CHOOSING A REGULATOR TOPOLOGY
W
U
U
Inverting Charge Pump
The inverting charge pump regulator combines an induc-
tor-based step-up with an inverting charge pump. This
configuration usually provides the best size, efficiency and
output ripple and is applicable where the magnitude of
V
OUT
is greater than V
IN
. Negative outputs to –38V can be
produced with the LT3483 in this configuration. For cases
where the magnitude of V
OUT
is less than or equal to V
IN
,
use a 2-inductor or transformer configuration such as the
inverting flyback.
In the inverting charge pump configuration, a resistor is
added in series with the Schottky diode between the
negative output and the D pin of the LT3483. The purpose
of this resistor is to smooth/reduce the current spike in the
flying capacitor when the switch turns on. A 10
resistor
works well for a Li
+
to –8V application, and the impact to
converter efficiency is less than 3%. The resistor values
recommended in the applications circuits also limit the
switch current during a short-circuit condition at the
output.
Inverting Flyback
The inverting flyback regulator, shown in the –5V applica-
tion circuit, uses a coupled inductor and is an excellent
choice where the magnitude of the output is less than or
equal to the supply voltage. The inverting flyback also
performs well in a step-up/invert application, but it occu-
pies more board space compared with the inverting charge
pump. Also, the maximum |V
OUT
| using the flyback is less
than can be obtained with the charge pump—it is reduced
from 38V by the magnitudes of V
IN
and ringing at the
switch node. Under a short-circuit condition at the output,
a proprietary technique limits the switch current and
prevents damage to the LT3483 even with supply voltage
as high as 16V. As an option, a 0.47
μ
F capacitor may be
added between terminals D and SW of LT3483 to suppress
ringing at SW.
Inductor Selection
Several recommended inductors that work well with the
LT3483 are listed in Table 1, although there are many other
manufacturers and devices that can be used. Consult each
manufacturer for more detailed information and for their
entire selection of related parts. Many different sizes and
shapes are available. For inverting charge pump regula-
tors with input and output voltages below 7V, a 4.7
μ
H or
6.8
μ
H inductor is usually the best choice. For flyback
regulators or for inverting charge pump regulators where
the input or output voltage is greater than 7V, a 10
μ
H
inductor is usually the best choice. A larger value inductor
can be used to slightly increase the available output
current, but limit it to around twice the value recom-
mended, as too large of an inductance will increase the
output voltage ripple without providing much additional
output current.
Table 1. Recommended Inductors
MAX
L
I
DC
DCR
PART
(
μ
H) (mA)
(
)
LQH2MCN4R7M02L
4.7
300
0.84
LQH2MCN6R8M02L
6.8
255
LQH2MCN100M02L
10
225
SDQ12
10
980
0.72
Coupled
15
780
1.15
Inductor
744876
10
550
0.46
Coupled
Inductor
Capacitor Selection
The small size and low ESR of ceramic capacitors make
them ideal for LT3483 applications. Use of X5R and X7R
types is recommended because they retain their capacitance
over wider voltage and temperature ranges than other di-
electric types. Always verify the proper voltage rating. Table
2 shows a list of several ceramic capacitor manufacturers.
Consult the manufacturers for more detailed information
on their entire selection of ceramic capacitors.
A 4.7
μ
F ceramic bypass capacitor on the V
IN
pin is
recommended where the distance to the power supply or
battery could be more than a couple inches. Otherwise, a
1
μ
F is adequate.
HEIGHT
(mm)
0.95
MANUFACTURER
Murata
www.murata.com
1.0
1.2
1.2
Cooper Electronics
Tech
www.cooperet.com
Würth Elektronik
www.we-online.com
1.2
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| LT3483EDC | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Inverting Micropower DC/DC Converter with Schottky |
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