参数资料
| 型号： | BD3509MUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 15/21页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 4A 20QFN |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.65 V ~ 2.7 V |
| 输入电压： | 0.7 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.028V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 4A（最小） |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | VQFN020V4040 |
| 包装： | 带卷 (TR) |
BD3508MUV,BD3509MUV
Technical Note
Component
R1/R2
R4
C16
C6
C8
C5
C20
C18
Recommended
Value
3.6k / 3.9k
100k
22μF
1μF
10μF
0.1μF
0.01μF
0.01μF
Programming Notes and Precautions
IC output voltage can be set with a configuration formula using the values for the internal
reference output voltage (V FB ) and the output voltage resistors (R1, R2).
Select resistance values that will avoid the impact of the V FB current ( ± 100nA).
The recommended total resistance value is 10K Ω .
This is the pull-up resistance for open drain pin.
It is recommended to set the value about 100k Ω .
To assure output voltage stability, please be certain the Vo1, Vo2, and Vo3 pins and the
GND pins are connected. Output capacitors play a role in loop gain phase compensation
and in mitigating output fluctuation during rapid changes in load level. Insufficient
capacitance may cause oscillation, while high equivalent series reisistance (ESR) will
exacerbate output voltage fluctuation under rapid load change conditions. While a 47μF
ceramic capacitor is recomended, actual stability is highly dependent on temperature and
load conditions. Also, note that connecting different types of capacitors in series may result
in insufficient total phase compensation, thus causing oscillation. In light of this information,
please confirm operation across a variety of temperature and load conditions.
The input capacitor reduces the output impedence of the voltage supply source connected
to the VCC. When the output impedence of this power supply increases, the input voltage
(VCC) may become unstable. This may result in the output voltage oscillation or lowering
ripple rejection. A low ESR 1μF capacitor with minimal susceptibility to temperature is
preferable, but stability depends on power supply characteristics and the substrate wiring
pattern. Please confirm operation across a variety of temperature and load conditions .
Input capacitors reduce the output impedance of the voltage supply source connected to
the (VIN) input pins. If the impedance of this power supply were to increase, input voltage
(VIN) could become unstable, leading to oscillation or lowered ripple rejection function.
While a low-ESR 10μF capacitor with minimal susceptibility to temperature is
recommended, stability is highly dependent on the input power supply characteristics and
the substrate wiring pattern. In light of this information, please confirm operation across a
variety of temperature and load conditions.
Input capacitors reduce the output impedance of the voltage supply source connected to
the (VDD) input pins. If the impedance of this power supply were to increase, input voltage
(VDD) could become unstable, leading to oscillation or lowered ripple rejection function.
While a low-ESR 0.1μF capacitor with minimal susceptibility to temperature is
recommended, stability is highly dependent on the input power supply characteristics and
the substrate wiring pattern. In light of this information, please confirm operation across a
variety of temperature and load conditions.
The Non Rush Current on Startup (NRCS) function is built into the IC to prevent rush
current from going through the load (VIN to Vo) and impacting output capacitors at power
supply start-up. Constant current comes from the NRCS pin when EN is HIGH or the UVLO
function is deactivated. The temporary reference voltage is proportionate to time, due to the
current charge of the NRCS pin capacitor, and output voltage start-up is proportionate to
this reference voltage. Capacitors with low susceptibility to temperature are recommended,
in order to assure a stable soft-start time.
This component is employed when the C16 capacitor causes, or may cause, oscillation. It
provides more precise internal phase correction.
www.rohm.com
? 2010 ROHM Co., Ltd. All rights reserved.
15/20
2010.04 - Rev.C
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