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| 型号： | LT8415EDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 25MA 12DFN |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 40 V |
| 输入电压： | 2.5 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 800kHz |
| 电流 - 输出： | 25mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 12-DFN-EP（3x2） |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
| 其它名称： | LT8415EDDB#TRMPBFDKR |
LT8415
APPLICATIONS INFORMATION
Inductor Selection
Several inductors that work well with the LT8415 are listed
in Table 1. The tables are not complete, and there are many
other manufacturers and devices 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.
Inductors with a value of 47μH or higher are recommended
for most LT8415 designs. Inductors with low core losses
and small DCR (copper wire resistance) are good choices
for LT8415 applications. For full output power, the induc-
tor should have a saturation current rating higher than
the peak inductor current. The peak inductor current can
be calculated as:
capacitor placed on the CAP node is recommended to ?lter
the inductor current while a 0.1μF to 1μF capacitor placed
on the V OUT node will give excellent transient response
and stability. To make the V REF pin less sensitive to noise,
putting a capacitor on the V REF pin is recommended, but
not required. A 47nF to 220nF 0402 capacitor will be suf-
?cient. See also Soft-Start section for more information
about a capacitor across V REF . Table 2 shows a list of several
capacitor manufacturers. Consult the manufacturers for
more detailed information and for their entire selection
of related parts.
Table 2. Recommended Ceramic Capacitor Manufacturers
MANUFACTURER PHONE WEBSITE
Taiyo Yuden (408) 573-4150 www.t-yuden.com
Murata (814) 237-1431 www.murata.com
I PK = I LIMIT
+
V IN ? 150 ? 10 ? 6
L
mA
AVX
Kemet
TDK
(843) 448-9411
(408)986-0424
(847) 803-6100
www.avxcorp.com
www.kemet.com
www.tdk.com
where the worst case I LIMIT is 30mA. L is the inductance
value in Henrys and V IN is the input voltage to the boost
circuit.
Table 1. Recommended Inductors for LT8415
Setting Output Voltage
The output voltage is set by the FBP pin voltage, and V OUT
is equal to 31.85 ? V FBP when the output is regulated,
PART
LQH2MCN680K02
LQH32CN101K53
DO2010-683ML
DO2010-104ML
LPS3015-104ML
LPS3015-154ML
L
(μH)
68
100
68
100
100
150
DCR
(μH)
6.6
3.5
8.8
15.7
3.4
6.1
SIZE
(mm)
2.0 × 1.6 × 0.9
3.2 × 2.5 × 2.0
2.0 × 2.0 × 1.0
2.0 × 2.0 × 1.0
3.0 × 3.0 × 1.4
3.0 × 3.0 × 1.4
VENDOR
Murata
www.murata.com
Coilcraft
www.coilcraft.com
shown in Figure 1. Since the V REF pin provides a good
reference (~1.235V), the FBP voltage can be easily set by
a resistor divider from the V REF pin to ground. The series
resistance of this resistor divider should be kept larger than
200KΩ to prevent loading down the V REF pin. The FBP pin
can also be biased directly by an external reference. For
over voltage protection, the output voltage is limited to
40V. Therefore, if V FBP is higher than 1.235V, the output
Capacitor Selection
voltage will stay at 40V.
50
The small size and low ESR of ceramic capacitors make
them suitable for most LT8415 applications. X5R and
X7R types are recommended because they retain their
capacitance over wider voltage and temperature ranges
than other types such as Y5V or Z5U. A 2.2μF or higher
input capacitor and a 0.1μF to 1μF output capacitor are
suf?cient for most applications. Always use a capacitor
with a suf?cient voltage rating. Many ceramic capacitors
rated at 0.1μF to 1μF have greatly reduced capacitance
40
30
20
10
when bias voltages are applied. Be sure to check actual
0
0
0.5
1 1.5
2
capacitance at the desired output voltage. Generally a 0603
FBP VOLTAGE (V)
8415 F01
or 0805 size capacitor will be adequate. A 0.1μF to 1μF
Figure 1. FBP to V OUT Transfer Curve
8415f
8
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