参数资料
型号: BD91361MUV-E2
厂商: Rohm Semiconductor
文件页数: 17/23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:
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
5. Determination of output voltage
Datasheet
The output voltage V OUT is determined by the equation (6):
V OUT =(R2/R1+1) × V ADJ ??? (6) V ADJ : Voltage at ADJ terminal (0.8V Typ.)
With R1 and R2 adjusted, the output voltage may be determined as required.
SW
L
Co
R2
Output
Adjustable output voltage range : 0.8V to 3.3V
ADJ
R1
Fig.37 Determination of output voltage
Use 1 k? to 100 k? resistor for R1.
If a resistor of the resistance higher than 100 k? is used, check the assembled set carefully for ripple voltage etc.
3.7
The lower limit of input voltage depends on the output voltage.
Basically, it is recommended to use in the condition :
VCCmin = V OUT +1.2V.
Fig.38. shows the necessary output current value at the lower limit
of input voltage. (DCR of inductor : 20m Ω )
This data is the characteristic value, so it’ doesn’t guarantee the
operation range,
3.5
3.3
3.1
Vo=2.5V
Vo=2.0V
Vo=1.8V
2.9
2.7
0
1
2
3
OUTPUT CURRENT : IOUT[A]
Fig.38 minimum input voltage in each output voltage
● Cautions on PC Board Layout
Fig.39 Layout diagram
① Lay out the input ceramic capacitor CIN closer to the pins PVCC and PGND, and the output capacitor Co closer to
the pin PGND.
② Lay out CITH and RITH between the pins ITH and GND as neat as possible with least necessary wiring.
※ VQFN020V4040 (BD91361MUV) has thermal PAD on the reverse of the package.
The package thermal performance may be enhanced by bonding the PAD to GND plane which take a large area of PCB.
www.rohm.com
?2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
17/21
TSZ02201-0J3J0AJ00200-1-2
02.MAR.2012 Rev.001
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