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参数资料
| 型号： | LTC3606BIDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.8A 8DFN |
| 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： | 0.6 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： | 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LTC3606B
APPLICATIONS INFORMATION
A general LTC3606B application circuit is shown in Figure 2.
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 in?uence the operat-
ing frequency, the inductor value has a direct effect on
ripple current. The inductor ripple current I L decreases
with higher inductance and increases with higher V IN or
V OUT :
Inductor Core Selection
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 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 LTC3606B requires to operate. Table 1
shows some typical surface mount inductors that work
I L = OUT ? 1
V
f O ? L
V OUT
V IN
(1)
well in LTC3606B applications.
Table 1. Representative Surface Mount Inductors
Accepting larger values of
I L allows the use of low
MANU-
FACTURER
PART NUMBER
MAX DC
VALUE CURRENT
DCR
HEIGHT
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, I L = 320mA (40% of 800mA).
The inductor value will also have an effect on Burst Mode
Coilcraft
FDK
LPS4012-152ML
LPS4012-222ML
LPS4012-332ML
LPS4012-472ML
LPS4018-222ML
LPS4018-332ML
LPS4018-472ML
FDKMIPF2520D
1.5μH
2.2μH
3.3μH
4.7μH
2.2μH
3.3μH
4.7μH
4.7μH
2200mA
1750mA
1450mA
1450mA
2300mA
2000mA
1800mA
1100mA
0.070Ω
0.100Ω
0.100Ω
0.170Ω
0.070Ω
0.080Ω
0.125Ω
0.11Ω
1.2mm
1.2mm
1.2mm
1.2mm
1.8mm
1.8mm
1.8mm
1mm
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
the upper range of low current operation. Furthermore,
Murata
Panasonic
Sumida
FDKMIPF2520D 3.3μH
FDKMIPF2520D 2.2μH
LQH32CN4R7M23 4.7μH
ELT5KT4R7M 4.7μH
CDRH2D18/LD 4.7μH
CDH38D11SNP- 3.3μH
3R3M
1200mA
1300mA
450mA
950mA
630mA
1560mA
0.1Ω
0.08Ω
0.2Ω
0.2Ω
0.086Ω
0.115Ω
1mm
1mm
2mm
1.2mm
2mm
1.2mm
lower inductance values will cause the bursts to occur
with increased frequency.
CDH38D11SNP-
2R2M
Taiyo Yuden CB2016T2R2M
2.2μH
2.2μH
1900mA
510mA
0.082Ω
0.13Ω
1.2mm
1.6mm
V IN
2.5V TO 5.5V
C IN
R PGD
V IN
RUN
LTC3606B
SW
L1
C F
V OUT
C OUT
CB2012T2R2M
CB2016T3R3M
NR30102R2M
NR30104R7M
2.2μH
3.3μH
2.2μH
4.7μH
530mA
410mA
1100mA
750mA
0.33Ω
0.27Ω
0.1Ω
0.19Ω
1.25mm
1.6mm
1mm
1mm
PGOOD
PGOOD
RLIM
GND
V FB
R2
R1
TDK
VLF3010AT4R7-
MR70
VLF3010AT3R3-
MR87
4.7μH
3.3μH
700mA
870mA
0.28Ω
0.17Ω
1mm
1mm
R LIM
C LIM
3606B F02
VLF3010AT2R2-
M1R0
2.2μH
1000mA
0.12Ω
1mm
VLF4012AT-2R2
2.2μH
1500mA
0.076Ω
1.2mm
Figure 2. LTC3606B General Schematic
M1R5
VLF5012ST-3R3
3.3μH
1700mA
0.095Ω
1.2mm
M1R7
VLF5014ST-2R2
2.2μH
2300mA
0.059Ω
1.4mm
M2R3
3606bfb
10
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