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| 型号： | LTC3619BIDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 10DFN |
| 标准包装： | 121 |
| 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 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： | 400mA，800mA |
| 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-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3619B
APPLICATIONS INFORMATION
? ? 1 ? OUT ?
V OUT ? V ?
Δ I L = (1)
AgeneralLTC3619BapplicationcircuitisshowninFigure2.
External component selection is driven by the load require-
ment, 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 influence the operating
frequency, the inductor value has a direct effect on ripple
current. The inductor ripple current Δ I L decreases with
higher inductance and increases with higher V IN or V OUT :
f O ? L ? V IN ?
Accepting larger values of Δ I 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 800mA
regulator, Δ I L = 320mA (40% of 800mA).
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 efficiency in
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. To-
roid 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 induc-
tor to use often depends more on the price versus size
requirements, and any radiated field/EMI requirements,
than on what the LTC3619B requires to operate. Table 1
shows some typical surface mount inductors that work
well in LTC3619B applications.
Table 1. Representative Surface Mount Inductors
MANU- MAX DC
FACTURER PART NUMBER VALUE CURRENT DCR HEIGHT
Coilcraft LPS4012-152ML 1.5μH 2200mA 0.070Ω 1.2mm
LPS4012-222ML 2.2μH 1750mA 0.100Ω 1.2mm
LPS4012-332ML 3.3μH 1450mA 0.100Ω 1.2mm
LPS4012-472ML 4.7μH 1450mA 0.170Ω 1.2mm
LPS4018-222ML 2.2μH 2300mA 0.070Ω 1.8mm
LPS4018-332ML 3.3μH 2000mA 0.080Ω 1.8mm
LPS4018-472ML 4.7μH 1800mA 0.125Ω 1.8mm
FDK FDKMIPF2520D 4.7μH 1100mA 0.11Ω 1mm
FDKMIPF2520D 3.3μH 1200mA 0.1Ω 1mm
FDKMIPF2520D 2.2μH 1300mA 0.08Ω 1mm
Murata LQH32CN4R7M23 4.7μH 450mA 0.2Ω 2mm
Panasonic ELT5KT4R7M 4.7μH 950mA 0.2Ω 1.2mm
Sumida CDRH2D18/LD 4.7μH 630mA 0.086Ω 2mm
CDH38D11SNP- 3.3μH 1560mA 0.115Ω 1.2mm
3R3M
CDH38D11SNP- 2.2μH 1900mA 0.082Ω 1.2mm
2R2M
V IN
2.5V TO 5.5V
C1
RUN2 V IN RUN1
Taiyo Yuden CB2016T2R2M
CB2012T2R2M
CB2016T3R3M
NR30102R2M
NR30104R7M
2.2μH
2.2μH
3.3μH
2.2μH
4.7μH
510mA
530mA
410mA
1100mA
750mA
0.13Ω
0.33Ω
0.27Ω
0.1Ω
0.19Ω
1.6mm
1.25mm
1.6mm
1mm
1mm
V OUT2
C OUT2
C F2
R4
L2
R3
PGOOD2 PGOOD1
LTC3619B
SW2 SW1
V FB2 V FB1
RLIM GND
C LIM R LIM
L1
R1
C F1
R2
V OUT1
C OUT1
3619B F02
TDK
VLF3010AT4R7-
MR70
VLF3010AT3R3-
MR87
VLF3010AT2R2-
M1R0
VLF4012AT-2R2
M1R5
VLF5012ST-3R3
M1R7
VLF5014ST-2R2
M2R3
4.7μH
3.3μH
2.2μH
2.2μH
3.3μH
2.2μH
700mA
870mA
1000mA
1500mA
1700mA
2300mA
0.28Ω
0.17Ω
0.12Ω
0.076Ω
0.095Ω
0.059Ω
1mm
1mm
1mm
1.2mm
1.2mm
1.4mm
Figure 2. LTC3619B General Schematic
3619bfb
11
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