参数资料
| 型号： | BD8314NUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 2.5A SON10 |
| 标准包装： | 3,000 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 4 V ~ 12 V |
| 输入电压： | 3 V ~ 12 V |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 无 |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | VSON010V3030 |
BD8314NUV
● Selection of Part for Applications
(1) Inductor
A shielded inductor that satisfies the current rating
(current value, Ipeak as shown in the drawing below)
and has a low DCR (direct resistance component) is
recommended.
Inductor values affect inductor ripple current, which will
cause output ripple.
Ripple current can be reduced as the coil L value
Technical Note
Δ I L
becomes larger and the
switching frequency becomes higher.
I peak ? I OUT ? ? V OUT / V IN ? / η ? Δ IL / 2 [ A ]
??? (1)
Fig.33 Inductor current
Δ IL ?
V IN
L
?
V OUT ? V IN
V OUT
?
1
f
[ A ]
??? (2)
( η : Efficiency, ? IL: Output ripple current, f: Switching frequency)
As a guide, inductor ripple current should be set at about 20 to 50% of the maximum input current.
* Current over the coil rating flowing in the coil brings the coil into magnetic saturation, which may lead to lower
efficiency or output oscillation. Select an inductor with an adequate margin so that the peak current does not
exceed the rated current of the coil.
(2) Output capacitor
A ceramic capacitor with low ESR is recommended for output in order to reduce output ripple.
There must be an adequate margin between the maximum rating and output voltage of the capacitor, taking the DC
bias property into consideration.
Output ripple voltage is obtained by the following equation.
V PP ? I OUT ?
V OUT ? V IN
f ? C O ? V OUT
? I OUT ? R ESR [ V ]
??? (3)
Setting must be performed so that output ripple is within the allowable ripple voltage.
(3) Output voltage setting
The internal reference voltage of the ERROR AMP is 1.0 V. Output voltage is obtained by Equation (4) of Fig. 33,
but it should be designed taking about 50 ? , an error of NMOS ON resistance of SWOUT into consideration.
VOUT
R1
INV
ERROR AMP
V O ?
? R1 ? R 2 ? ? 1 . 0 [ V ]
R 2
??? (4)
R2
VREF
1.0V
SWOUT
STB
Fig.34
Setting of voltage feedback resistance
www.rohm.com
? 2013 ROHM Co., Ltd. All rights reserved.
10/14
2013.12 - Rev.F
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