参数资料
| 型号： | BD91361MUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 15/23页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 20VQFN |
| 特色产品： | BD91x Series Step-Down Regulators |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 3.3 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 20-VQFN |
| 其它名称： | BD91361MUV-E2DKR |
BD91361MUV
● Selection of Components Externally Connected
1. Selection of inductor (L)
Datasheet
I L
Δ I L
The inductance significantly depends on output ripple current.
As seen in the equation (1), the ripple current decreases as
the inductor and/or switching frequency increases.
V CC
Δ I L =
(V CC -V OUT ) × V OUT
L × V CC × f
[A] ??? (1)
Δ I L × V CC × f
IL
L
V OUT
Co
Appropriate ripple current at output should be 20% more or less of
the maximum output current.
Δ I L =0.2 × I OUT max. [A] ??? (2)
(V CC -V OUT ) × V OUT
L= [H] ??? (3)
Fig.31 Output ripple current
( Δ I L : Output ripple current, and f: Switching frequency)
※ Current exceeding the current rating of the inductor results in magnetic saturation of the inductor, which decreases
efficiency. The inductor must be selected allowing sufficient margin with which the peak current may not exceed its
current rating.
If V CC =5.0V, V OUT =1.2V, f=1MHz, Δ I L =0.2 × 3A=0.6A, for example,(BD91361MUV)
L=
(5-1.2) × 1.2
0.6 × 5 × 1M
=1.52μ → 2.0[μH]
※ Select the inductor of low resistance component (such as DCR and ACR) to minimize dissipation in the inductor for
better efficiency.
2. Selection of output capacitor (C O )
V CC
V OUT
Output capacitor should be selected with the consideration on the stability
region and the equivalent series resistance required to smooth ripple voltage.
Output ripple voltage is determined by the equation (4) :
L
ESR
Δ V OUT = Δ I L × ESR [V] ??? (4)
Co
Fig.32 Output capacitor
3. Selection of input capacitor (Cin)
( Δ I L : Output ripple current, ESR: Equivalent series resistance of output capacitor)
※ Rating of the capacitor should be determined allowing sufficient margin
against output voltage. A 22μF to 100μF ceramic capacitor is recommended.
Less ESR allows reduction in output ripple voltage.
V CC
Cin
Input capacitor to select must be a low ESR capacitor of the capacitance
sufficient to cope with high ripple current to prevent high transient voltage.
The ripple current IRMS is given by the equation (5):
V CC
2
L
Co
V OUT
√ V OUT (V CC -V OUT )
I RMS =I OUT ×
< Worst case > I RMS(max.)
I OUT
When Vcc=2 × V OUT , I RMS =
[A] ??? (5)
Fig.33 Input capacitor
If V CC =3.3V, V OUT =1.8V, and I OUTmax.= 3A, (BD91361MUV)
3 3.3
√ 1.8(3.3-1.8)
I RMS =2 × =1.49[A RMS ]
.
A low ESR 22μF/10V ceramic capacitor is recommended to 3 reduce ESR dissipation of input capacitor for better efficiency.
www.rohm.com
?2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
15/21
TSZ02201-0J3J0AJ00200-1-2
02.MAR.2012 Rev.001
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