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| 型号： | LTC3104IDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 339K |
| 描述： | IC REG DL BUCK/LINEAR SYNC 14DFN |
| 标准包装： | 91 |
| 拓扑： | 降压（降压）同步（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 1.2MHz |
| 电压/电流 - 输出 1： | 0.6 V ~ 13.8 V，300mA |
| 电压/电流 - 输出 2： | 0.6 V ~ 14.5 V，10mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 2.5 V ~ 15 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN（4x3） |
| 包装： | 管件 |
LTC3104
13
3104f
APPLICATIONS INFORMATION
output capacitor is too large, the crossover frequency can
decrease too far below the compensation zero and also
lead to degraded phase margin. Table 3 provides a guide-
line for the range of allowable values of low ESR output
capacitors assuming a feedforward capacitor is used.
See the Output Voltage Programming section for more
details on selecting a feedforward capacitor. Larger value
output capacitors can be accommodated provided they
have sufficient ESR to stabilize the loop, or by increasing
the value of the feedforward capacitor in parallel with the
upper resistor divider resistor.
In Burst Mode operation, the output capacitor stores energy
to satisfy the load current when the LTC3104 is in a low
current sleep state between the burst pulses. It can take
several cycles to respond to a large load step during a sleep
period. If large transient load currents are required then
a larger capacitor can be used at the output to minimize
output voltage droop until the part transitions from Burst
Mode operation to continuous mode operation.
Note that even X5R and X7R type ceramic capacitors have
a DC bias effect which reduces their capacitance when a
DC voltage is applied. It is not uncommon for capacitors
offered in the smallest case sizes to lose more than 50%
of their capacitance when operated near their rated volt-
age. As a result it is sometimes necessary to use a larger
capacitance value or use a higher voltage rating in order to
realize the intended capacitance value. Consult the manu-
facturers data for the capacitor you select to be assured
of having the necessary capacitance in your application.
Table 3. Recommended Output Capacitor Limits
OUTPUT VOLTAGE (V) C
MIN
(礔)
C
MAX
(礔)
0.8
22.0
220
1.2
15.0
220
2.0
12.0
100
2.7
6.8
68
3.3
4.7
47
5.0
4.7
47
ensure stability of the loop. If the output capacitance is
too small, the loop crossover frequency will increase to
the point where switching delay and the high frequency
parasitic poles of the error amplifier will degrade the
phase margin. In addition, the wider bandwidth produced
by a small output capacitor will make the loop more sus-
ceptible to switching noise. At the other extreme, if the
Table 2. Representative Inductor Selection
PART NUMBER
VALUE
(礖)
DCR
(?
MAX DC
CURRENT
(A)
SIZE (MM)
W ?/SPAN> L ?/SPAN> H
Coilcraft
EPL3015
6.8 0.19 1.00 3.0 ?3.0 ?1.5
LPS3314
10 0.33 0.70 3.3 ?3.3 ?1.3
LPS4018
15 0.26 1.12 4.0 ?4.0 ?1.8
Cooper-Bussman
SD3114
6.8 0.30 0.98
3.1 ?3.1 ?1.4
SD3118
10 0.3 0.75 3.2 ?3.2 ?1.8
Murata
LQH3NPN
6.8 0.20 1.25 3.0 ?3.0 ?1.4
LQH44PN
10 0.16 1.10
4.0 ?4.0 ?1.7
Sumida
CDRH3D16
6.8 0.17 0.73 3.8 ?3.8 ?1.8
CDRH3D16
10 0.21 0.55 3.8 ?3.8 ?1.8
Taiyo-Yuden
CBC3225
6.8 0.16 0.93 3.2 ?2.5 ?2.5
NR3015
10 0.23 0.70 3.0 ?3.0 ?1.5
NR4018
15 0.30 0.65 4.0 ?4.0 ?1.8
W黵th
744029006
6.8 0.25 0.95 2.8 ?2.8 ?1.4
744031006
6.8 0.16 0.85 3.8 ?3.8 ?1.7
744031100
10 0.19 0.74
3.8 ?3.8 ?1.7
744031100
15 0.26 0.62 3.8 ?3.8 ?1.7
Panasonic
ELLVGG6R8N
6.8 0.23 1.00 3.0 ?3.0 ?1.5
ELL4LG100MA
10 0.20 0.80
3.8 ?3.8 ?1.8
TDK
VLF3012
6.8 0.18 0.78 3.0 ?2.8 ?1.2
VLC4018
10 0.16 0.85
4.0 ?4.0 ?1.8
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