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| 型号： | LTC3419IMS-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 10MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
LTC3419
APPLICATIONS INFORMATION
A general LTC3419 application circuit is shown in Figure 1.
External component selection is driven by the load
requirement, and begins with the selection of the
inductor L. Once the inductor is chosen, C IN and C OUT
can be selected.
Inductor Selection
Although the inductor does not in?uence the operating
frequency, the inductor value has a direct effect on ripple
current. The inductor ripple current ΔI L decreases with
higher inductance and increases with higher V IN or V OUT :
or shielded pot cores in ferrite or permalloy materials are
small and do not radiate much energy, but generally cost
more than powdered iron core inductors with similar
electrical characteristics. The choice of which style
inductor to use often depends more on the price versus
size requirements, and any radiated ?eld/EMI requirements,
than on what the LTC3419 requires to operate. Table 1
shows some typical surface mount inductors that work
well in LTC3419 applications.
Table 1. Representative Surface Mount Inductor s
MANU- MAX DC
V ? V ?
Δ I L = OUT ? ? 1 ? OUT ?
f O ? L ? V IN ?
( 1 )
FACTURER
Taiyo Yuden
PART NUMBER
CB2016T2R2M
CB2012T2R2M
CB2016T3R3M
VALUE CURRENT
2.2μH 510mA
2.2μH 530mA
3.3μH 410mA
DCR HEIGHT
0.13 Ω 1.6mm
0.33 Ω 1.25mm
0.27 Ω 1.6mm
Accepting larger values of ΔI L allows the use of low
inductances, but results in higher output voltage ripple,
greater core losses, and lower output current capability.
A reasonable starting point for setting ripple current is
40% of the maximum output load current. So, for a 600mA
regulator, ΔI L = 240mA (40% of 600mA).
The inductor value will also have an effect on Burst Mode
operation. The transition to low current operation begins
when the peak inductor current falls below a level set by
the internal burst clamp. Lower inductor values result in
higher ripple current which causes the transition to occur
at lower load currents. This causes a dip in ef?ciency in
Panasonic
Sumida
Murata
Taiyo Yuden
FDK
TDK
ELT5KT4R7M
CDRH2D18/LD
LQH32CN4R7M23
NR30102R2M
NR30104R7M
FDKMIPF2520D
FDKMIPF2520D
FDKMIPF2520D
VLF3010AT4R7-
MR70
VLF3010AT3R3-
MR87
VLF3010AT2R2-
M1R0
4.7μH
4.7μH
4.7μH
2.2μH
4.7μH
4.7μH
3.3μH
2.2μH
4.7μH
3.3μH
2.2μH
950mA
630mA
450mA
1100mA
750mA
1100mA
1200mA
1300mA
700mA
870mA
1000mA
0.2 Ω
0.086 Ω
0.2 Ω
0.1 Ω
0.19 Ω
0.11 Ω
0.1 Ω
0.08 Ω
0.28 Ω
0.17 Ω
0.12 Ω
1.2mm
2mm
2mm
1mm
1mm
1mm
1mm
1mm
1mm
1mm
1mm
the upper range of low current operation. Furthermore,
lower inductance values will cause the bursts to occur
with increased frequency.
Inductor Core Selection
Different core materials and shapes will change the size/
current and price/current relationship of an inductor. Toroid
Input Capacitor (C IN ) Selection
In continuous mode, the input current of the converter is a
square wave with a duty cycle of approximately V OUT / V IN .
To prevent large voltage transients, a low equivalent series
resistance (ESR) input capacitor sized for the maximum
RMS current must be used. The maximum RMS capacitor
current is given by:
V IN
2.5V TO 5.5V
C1
RUN2 V IN RUN1
MODE
I RMS ≈ I MAX
V OUT ( V IN ? V OUT )
V IN
V OUT2
C F2
L2
LTC3419
SW2 SW1
L1
C F1
V OUT1
Where the maximum average output current I MAX equals
the peak current minus half the peak-to-peak ripple cur-
C OUT2
R4
R3
V FB2
GND
V FB1
R1
R2
C OUT1
3419 F01
rent, I MAX = I LIM – ΔI L /2. This formula has a maximum at
V IN = 2V OUT , where I RMS = I OUT /2. This simple worst-case
is commonly used to design because even signi?cant
Figure 1. LTC3419 General Schematic
3419fa
9
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