参数资料
| 型号： | LTC3402EMS#TR |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 2A 10MSOP |
| 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： | 2.6 V ~ 5.5 V |
| 输入电压： | 0.5 V ~ 5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 2A |
| 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-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
LTC3402
APPLICATIO S I FOR ATIO
COMPONENT SELECTION
Table 1. Inductor Vendor Information
SUPPLIER
PHONE
FAX
WEBSITE
Inductor Selection
The high frequency operation of the LTC3402 allows the
Coilcraft
Coiltronics
(847) 639-6400
(516) 241-7876
(847) 639-1469
(516) 241-9339
www.coilcraft.com
www.coiltronics.com
use of small surface mount inductors. The minimum
inductance value is proportional to the operating fre-
quency and is limited by the following constraints:
Murata
Sumida
(814) 237-1431 (814) 238-0490
(800) 831-9172
USA: (847) 956-0666 (847) 956-0702
www.murata.com
www.japanlink.com
L > μ H and L >
3
f
V IN ( MIN ) ? V OUT ( MAX ) – V IN ( MIN )
f ? Ripple ? V OUT ( MAX )
H
Japan: 81-3-3607-5111 81-3-3607-5144
Output Capacitor Selection
sumida
where
f = Operating Frequency (Hz)
Ripple = Allowable Inductor Current Ripple (A)
V IN(MIN) = Minimum Input Voltage (V)
The output voltage ripple has several components. The
bulk value of the capacitor is set to reduce the ripple due
to charge into the capacitor each cycle. The max ripple due
to charge is given by:
V OUT(MAX) = Maximum Output Voltage (V)
The inductor current ripple is typically set to 20% to 40%
of the maximum inductor current.
VR BULK =
where
I P ? V IN
C OUT ? V OUT ? f
V
I P = Peak Inductor Current
V OUT
R t
MODE
V IN
SW
GND
SHDN
V C
FB
V OUT
POK
3402 F01
The ESR can be a significant factor for ripple in most
power converters. The ripple due to capacitor ESR is
simply given by:
VR CESR = I P ? R ESR V
where
R ESR = Capacitor Series Resistance
Low ESR capacitors should be used to minimize output
Figure 1. Recommended Component Placement. Traces
Carrying High Current Are Direct. Trace Area FB and V C Pins
Are Kept Low. Lead Length to Battery Should be Kept Short
For high efficiency, choose an inductor with a high fre-
quency core material, such as ferrite, to reduce core
losses. The inductor should have low ESR (equivalent
series resistance) to reduce the I 2 R losses and must be
able to handle the peak inductor current without saturat-
voltage ripple. For surface mount applications, AVX TPS
series tantalum capacitors and Sanyo POSCAP or Taiyo-
Yuden ceramic X5R or X7R type capacitors are recom-
mended. For through-hole applications Sanyo OS-CON
capacitors offer low ESR in a small package size. See Table
2 for a list of component suppliers. In some layouts it may
be required to place a 1 μ F low ESR capacitor as close to the
V OUT and GND pins as possible.
ing. Molded chokes or chip inductors usually do not have
enough core to support the peak inductor currents in the
1A to 2A region. To minimize radiated noise, use a toroid,
pot core or shielded bobbin inductor. See Table 1 for
Table 2. Capacitor Vendor Information
SUPPLIER PHONE FAX
AVX (803) 448-9411 (803) 448-1943
WEBSITE
www.avxcorp.com
suggested components and Table 1 for a list of component
suppliers.
Sanyo
Taiyo Yuden
(619) 661-6322
(408) 573-4150
(619) 661-1055
(408) 573-4159
www.sanyovideo.com
www.t-yuden.com
3402fb
9
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