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| 型号： | LTC3447EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 10DFN |
| 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： | 0.69 V ~ 2.05 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 600mA |
| 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3447
OPERATIO
Table 1. I 2 C Fast-Mode Timing Speci?cations (for Reference)
f I2C
t BUF
t HD,RSTA
t SU,RSTA
t SU,STOP
t HD,DAT
t SU,DAT
t LOW
t HIGH
t SP
t f
t r
I 2 C Operating Frequency
Bus free time between Stop and Start Condition
Hold Time after (Repeated) Start Condition
Repeated Start Condition Setup Time
Stop Condition Setup Time
Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
Pulse Width of Spikes Suppressed by Input Filter
Clock, Data Fall Time
Clock, Data Rise Time
0
1.3
0.6
0.6
0.6
0
100
1.3
0.6
0
20 + 0.1 ? C B
20 + 0.1 ? C B
400
0.9
50
300
300
kHz
μs
μs
μs
μs
ns
ns
μs
μs
ns
ns
ns
C B = Capacitance of one bus line.
APPLICATIO S I FOR ATIO
The basic LTC3447 application circuit is shown on the
front page of the data sheet. External component selec-
tion is driven by the load requirement and begins with the
selection of L1 followed by C IN and C OUT .
Inductor Selection
For most applications, the value of the inductor will fall
in the range of 1μH to 4.7μH. Its value is chosen based
on the desired ripple current. Large value inductors
lower ripple current and small value inductors result in
higher ripple currents. Higher V IN or V OUT also increases
the ripple current as shown in Equation 1. A reasonable
starting point for setting ripple current is Δ I L = 240mA
(40% of 600mA).
to occur at lower load currents, which can cause a dip in
ef?ciency in the upper range of low current operation. In
Burst Mode operation, lower inductance values will cause
the burst frequency to increase.
Inductor Core Selection
Different core materials and shapes will change the size/cur-
rent and price/current relationship of an inductor. Toroid
or shielded pot cores in ferrite or perm alloy materials are
small and don’t 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 ?eld/EMI requirements
? I L OUT ? 1 –
=
?
( f )( L )
V
1 ?
V OUT ?
V IN ( MAX ) ? ?
(1)
than on what the LTC3447 requires to operate. Table 2
shows some typical surface mount inductors that work
well in LTC3447 applications.
The DC current rating of the inductor should be at least
Table 2.
equal to the maximum load current plus half the ripple
current to prevent core saturation. Thus, a 920mA rated
Manufacturer
Part Number
Value DCR Max DC Size
(μH) (m Ω max) Current (A) W x L x H (mm 3 )
inductor should be enough for most applications (800mA
Sumida
3.3
85
1.4
4.0 x 4.0 x 1.8
+ 120mA). For better ef?ciency, choose a low DC resis-
CDRH3D16/HP3R3
tance inductor.
The inductor value also has an effect on Burst Mode
Sumida
CR434R7
Murata
4.7
2.2
109
29
1.15
3.2
4.0 x 4.5 x 3.5
5.0 x 5.0 x 4.7
operation. The transition to low current operation begins
LQH55DN2R2MO3
when the inductor current peaks fall to approximately
Toko
2.2
59
1.63
5.0 x 5.0 x 2.0
50mA. Lower inductor values (higher Δ I L ) will cause this
D52LC-A914BYW-2R2M
3447f
11
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