参数资料
| 型号： | LT3489EMS8E#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 2.5A 8MSOP |
| 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 ~ 40 V |
| 输入电压： | 2.6 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP-EP |
LT3489
APPLICATIO S I FOR ATIO
Inductor Selection
Several inductors that work well with the LT3489 are listed
in Table 1. This table is not exclusive; there are many other
manufacturers and inductors that can be used. Consult
each manufacturer for more detailed information and for
their entire selection of related parts, as many different
sizes and shapes are available. Ferrite core inductors
should be used to obtain the best ef?ciency, as core
losses at 2MHz are much lower for ferrite cores than for
the cheaper powdered-iron ones. Choose an inductor that
can handle at least 2.5A without saturating, and ensure
that the inductor has a low DCR (copper wire resistance)
to minimize I 2 R power losses. A 2.2 μ H to 5 μ H inductor
will be the best choice for most LT3489 designs. Note
that in some applications, the current handling require-
ments of the inductor can be lower, such as in the SEPIC
topology where each inductor only carries one-half of the
total switch current. The inductors shown in Table 1 were
chosen for small size. For better ef?ciency, use similar
valued inductors with a larger volume.
Capacitor Selection
Low ESR (equivalent series resistance) capacitors should
be used at the output to minimize the output ripple voltage.
Multilayer ceramic capacitors are an excellent choice, as
they have an extremely low ESR and are available in very
small packages. X5R or X7R dielectrics are preferred, as
these materials retain the capacitance over wide voltage
and temperature ranges. A 4.7μF to 20μF output capacitor
is suf?cient for most applications, but systems with very
low output currents may need only a 1μF or 2.2μF output
capacitor. Solid tantalum or OS-CON capacitors can be
used, but they will occupy more board area than a ceramic
and will have a higher ESR. Always use a capacitor with a
suf?cient voltage rating.
Ceramic capacitors also make a good choice for the input
decoupling capacitor, which should be placed as close as
possible to the LT3489. A 2.2 μ F to 4.7 μ F input capacitor
is suf?cient for most applications. Table 2 shows a list
of several ceramic capacitor manufacturers. Consult the
manufacturers for detailed information on their entire
selection of ceramic parts.
Table 1. Recommended Inductors
SIZE
PART
SD25-2R2
SD25-3R3
SD25-4R7
A916CY-2R7M
A916CY-3R3M
A916CY-4R7M
LQH55DN2R2M03
LQH55DN3R3M03
LQH55DN4R7M03
L ( μ H)
2.2
3.3
4.7
2.7
3.3
4.7
2.2
3.3
4.7
TYPICAL DCR (m Ω )
31
38
47
18.3
21.4
26.3
29
36
41
L × W × H (mm)
5.45 × 5.45 × 2.7
6 × 6 × 3.5
5.7 × 5 × 4.7
VENDOR
CooperBussmann
(888) 414-2645
www.cooperet.com
Toko
www.toko.com
Murata
(770) 436-1300
www.murata.com
Table 2. Ceramic Capacitor Manufacturers
Taiyo Yuden
AVX
Murata
(408) 573-4150
www.t-yuden.com
(843) 448-9411
www.avxcorp.com
(770) 436-1300
www.murata.com
3489f
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