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参数资料
| 型号： | DC1227A |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR LTC3534 |
| 设计资源： | DC1227A Design Files DC1227A Schematic |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步升/步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 5V |
| 电流 - 输出： | 500mA（最小值） |
| 输入电压： | 3.6 ~ 7 V |
| 稳压器拓扑结构： | 降压-升压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTC3534 |
LTC3534
APPLICATIONS INFORMATION
COMPONENT SELECTION
2 RUN/SS
3 GND
4 PGND1
5 SW1
FB 15
V C 14
V IN 13
PV IN 12
V IN
6 SW2
7 PGND2
V OUT 11
PWM 10
V OUT
PWM
MULTIPLE VIAS
3534 F04
Figure 4. Recommended Component Placement. Traces Carrying High Current are Direct. Trace Area at FB and V C Pins
are Kept Low. Lead Length to Battery Should be Kept Short. Keep V OUT and V IN Ceramic Capacitors Close to their IC Pins.
V IN(MIN) ? ( V OUT – V IN(MIN) ) H
f ? ? I L ? V OUT
V OUT ? ( V IN(MAX) – V OUT ) H
L BUCK >
InductorSelection
The high frequency operation of the LTC3534 allows the
use of small surface mount inductors. The inductor ripple
current is typically set to 20% to 40% of the maximum
inductor current. For a given ripple the inductance terms
are given as follows:
L BOOST >
f ? ? I L ? V IN(MAX)
where f = switching frequency in Hz, typically 1MHz.
Table 1. Inductor Vendor Information
D I L = maximum allowable inductor ripple current, A
V IN(MIN) = minimum input voltage, V
V IN(MAX) = maximum input voltage, V
V OUT = output voltage, V
For high efficiency, choose a ferrite inductor with a high
frequency core material to reduce core loses. The induc-
tor 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 saturating. 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 shielded inductor. See Table 1 for a
suggested list of inductor suppliers.
SUPPLIER
Coilcraft
FDK
Murata
PHONE
(847) 639-6400
(408) 432-8331
(814) 237-1431
(800) 831-9172
FAX OR E-MAIL
(847) 639-1469
america@fdk.com
(814) 238-0490
WEBSITE
www.coilcraft.com
www.fdk.com
www.murata.com
Sumida
USA: (847) 956-0666 USA: (847) 956-0702
Japan: 81(3) 3607-5111 Japan: 81(3) 3607-5144
www.sumida.com
TDK
TOKO
(847) 803-6100
(847) 297-0070
(847) 803-6296
(847) 699-7864
www.component.tdk.com
www.tokoam.com
3534fb
12
For more information www.linear.com/LTC3534
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