参数资料
| 型号： | BD3508EKN-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 20HQFN |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 可调 |
| 输入电压： | 1.2 V ~ 6.5 V |
| 电压 - 压降（标准）： | 0.065V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 限制（最小）： | 3A |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VQFN |
| 供应商设备封装： | 20-HQFN |
| 包装： | 带卷 (TR) |
● Recommended Circuit Example
Option
R3
C5
15
14
13
12
11
Vo (1.2V/3A)
16
10
C3
17
9
C2
VIN
R2
18
19
8
7
R1
20
6
VEN
C4
1
2
3
4
5
C1
VCC
Component
R1/R2
C3
C1
C2
C4
R3/C5
Recommended
Value
3.9k/3.3k
47 μ F
1 μ F
10 μ F
0.01 μ F
-
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 ? .
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 47 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 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 (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 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 C3 capacitor causes, or may cause, oscillation. It
provides more precise internal phase correction.
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相关代理商/技术参数 |
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| BD3508MUV | 制造商:ROHM 制造商全称:Rohm 功能描述:Nch FET Ultra LDO for PC Chipsets |
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| BD3508MUV-E2 | 功能描述:低压差稳压器 - LDO ULTRA LOW DROPOUT LIN. REG. RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| BD3509MUV | 制造商:ROHM 制造商全称:Rohm 功能描述:Nch FET Ultra LDO for PC Chipsets |
| BD3509MUV_10 | 制造商:ROHM 制造商全称:Rohm 功能描述:Nch FET Ultra LDO for PC Chipsets |
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