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| 型号： | LTC3400ES6-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC ADJ .85A SOT23-6 |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 5 V |
| 输入电压： | 0.5 V ~ 6 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 850mA |
| 同步整流器： | 是 |
| 工作温度： | -30°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LTC3400/LTC3400B
APPLICATIO S I FOR ATIO
The inductor current ripple is typically set for 20% to 40%
of the maximum inductor current (I P ). High frequency
ferrite core inductor materials reduce frequency depen-
dent power losses compared to cheaper powdered iron
types, improving efficiency. The inductor should have low
ESR (series resistance of the windings) to reduce the I 2 R
power losses, and must be able to handle the peak
inductor current without saturating. Molded chokes and
some chip inductors usually do not have enough core to
support the peak inductor currents of 850mA seen on the
LTC3400/LTC3400B. To minimize radiated noise, use a
toroid, pot core or shielded bobbin inductor. See Table 1
for some suggested components and suppliers.
Table 1. Recommended Inductors
MAX
extremely low ESR and are available in small footprints. A
2.2 μ F to 10 μ F output capacitor is sufficient for most
applications. Larger values up to 22 μ F may be used to
obtain extremely low output voltage ripple and improve
transient response. An additional phase lead capacitor
may be required with output capacitors larger than 10 μ F
to maintain acceptable phase margin. X5R and X7R
dielectric materials are preferred for their ability to main-
tain capacitance over wide voltage and temperature ranges.
Low ESR input capacitors reduce input switching noise
and reduce the peak current drawn from the battery. It
follows that ceramic capacitors are also a good choice for
input decoupling and should be located as close as pos-
sible to the device. A 4.7 μ F input capacitor is sufficient for
virtually any application. Larger values may be used with-
PART
CDRH5D18-4R1
CDRH5D18-100
CDRH3D16-4R7
L
( μ H)
4.1
10
4.7
DCR
m ?
57
124
105
HEIGHT
(mm)
2.0
2.0
1.8
VENDOR
Sumida
(847) 956-0666
www.sumida.com
out limitations. Table 2 shows a list of several ceramic
capacitor manufacturers. Consult the manufacturers di-
rectly for detailed information on their entire selection of
ceramic parts.
CDRH3D16-6R8
CR43-4R7
CR43-100
4.7
10
170
109
182
1.8
3.5
3.5
Table 2. Capacitor Vendor Information
SUPPLIER PHONE
WEBSITE
CMD4D06-4R7MC
CMD4D06-3R3MC
4.7
3.3
216
174
0.8
0.8
AVX
Murata
(803) 448-9411
(714) 852-2001
www.avxcorp.com
www.murata.com
DS1608-472
DS1608-103
4.7
10
60
75
2.9
2.9
Coilcraft
(847) 639-6400
Taiyo Yuden
(408) 573-4150
www.t-yuden.com
DO1608C-472
4.7
90
2.9
www.coilcraft.com
D52LC-4R7M
D52LC-100M
LQH3C4R7M24
4.7
10
4.7
84
137
195
2.0
2.0
2.2
Toko
(408) 432-8282
www.tokoam.com
Murata
Output Diode
Use a Schottky diode such as an MBR0520L, PMEG2010EA,
1N5817 or equivalent if the converter output voltage is 4.5V
www.murata.com
Output and Input Capacitor Selection
Low ESR (equivalent series resistance) capacitors should
be used to minimize the output voltage ripple. Multilayer
or greater. The Schottky diode carries the output current for
the time it takes for the synchronous rectifier to turn on. Do
not use ordinary rectifier diodes, since the slow recovery
times will compromise efficiency. A Schottky diode is
optional for output voltages below 4.5V, but will increase
converter efficiency by 2% to 3%.
ceramic capacitors are an excellent choice as they have
3400fa
7
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