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参数资料
| 型号： | LTC3413IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 5.5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
LTC3413
APPLICATIONS INFORMATION
Inductor Selection
For a given input and output voltage, the inductor value
and operating frequency determine the ripple current. The
ripple current Δ I L increases with higher V IN or V OUT and
decreases with higher inductance.
Different core materials and shapes will change the size/
current 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
characteristics. The choice of which style inductor to use
V OUT ? 1 – OUT ?
Δ I L =
1
( f )( L )
? V ?
? V IN ?
mainly depends on the price versus size requirements and
any radiated ?eld/EMI requirements.
Having a lower ripple current reduces the core losses in
the inductor, the ESR losses in the output capacitors and
the output voltage ripple. Highest ef?ciency operation is
Table 1 shows some recommended surface mount induc-
tors for LTC3413 applications.
Table 1. Recommended Surface Mount Inductors
achieved at low frequency with small ripple current. This,
however, requires a large inductor.
A reasonable starting point for selecting the ripple current
is Δ I L = 0.4(I MAX ). The largest ripple current occurs at the
highest V IN . To guarantee that the ripple current stays
MANUFACTURER
Murata
Vishay/Dale
Pulse
Cooper
PART NUMBER
LQH55DNR47M01
IHLP252CZPJR47M01
P1166.681T
SD20-R47
VALUE
(μH)
0.47
0.47
0.44
0.47
DCR
(mΩ)
13.0
4.2
6.0
20.0
below a speci?ed maximum, the inductor value should
? f Δ I L ( MAX ) ? ?
L = ? ? ? 1 – ?
be chosen according to the following equation:
? V OUT ? ? V OUT ?
V IN ( MAX ) ?
Inductor Core Selection
Once the value for L is known, the type of inductor must
C IN and C OUT Selection
The input capacitance, C IN , is needed to ?lter the trapezoidal
wave current at the source of the top MOSFET. To prevent
large voltage transients from occurring, a low ESR input
capacitor sized for the maximum RMS current should be
used. The maximum RMS current is given by:
be selected. Actual core loss is independent of core size
for a ?xed inductor value, but it is very dependent on the
inductance selected. As the inductance increases, core
I RMS = I OUT ( MAX )
V OUT
V IN
V IN
V OUT
–1
losses decrease. Unfortunately, increased inductance
requires more turns of wire and therefore copper losses
will increase.
Ferrite designs have very low core losses and are used
often at high switching frequencies, so design goals can
concentrate on copper loss and preventing saturation.
Ferrite core material saturates “hard,” which means that
inductance collapses abruptly when the peak design current
is exceeded. This results in an abrupt increase in inductor
ripple current and consequent output voltage ripple. Do
not allow the core to saturate!
This formula has a maximum at V IN = 2V OUT , where I RMS =
I OUT /2. This simple worst-case condition is commonly used
for design because even signi?cant deviations do not offer
much relief. Note that ripple current ratings from capacitor
manufacturers are often based on only 2000 hours of life
which makes it advisable to further derate the capacitor,
or choose a capacitor rated at a higher temperature than
required. Several capacitors may also be paralleled to meet
size or height requirements in the design.
The selection of C OUT is determined by the effective series
resistance (ESR) that is required to minimize voltage ripple
3413fc
8
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