参数资料
| 型号： | BD3512MUV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 3A 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）： | 0.065V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A（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) |
● Recommended Circuit Example
Vo (1.2V/3A)
C16
15
14
13
12
11
C9
VIN
16
17
10
9
C FB
R18
18
19
8
7
R9
R8
VEN
R19
C20
20
1
2
3
4
5
6
C6
VCC
C2
C3
R4
VCC
C5
VPGOOD
Component
R18/R19
R4
C16
C6/C5
C9
C20
C FB
Recommended
Value
3.3k/3.9k
100k
22 μ F
1 μ F/0.1 μ F
10 μ F
0.01 μ F
1000pF
Programming Notes and Precautions
IC output voltage can be set with a configuration formula V FB × (R18+R19)/R19 using the
values for the internal reference output voltage (V FB ) and the output voltage resistors (R18,
R19). Select resistance values that will avoid the impact of the FB bias 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 ～ Vo5 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 22 μ F 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.
Input capacitors reduce the output impedance of the voltage supply source connected to
the (VCC) input pins. If the impedance of this power supply were to increase, input voltage
(VCC) could become unstable, leading to oscillation or lowered ripple rejection function.
While a low-ESR 1 μ F / 0.1 μ F 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 (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 10 μ F 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.
11/16
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