参数资料
| 型号： | BD3522EFV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 14/21页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 4A HTSSOP-B20 |
| 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 |
| 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-VSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-HTSSOP-B |
| 包装： | 带卷 (TR) |
● Recommended Circuit Example (BD3522EFV)
V IN
C20
R15
R14
C13
C12
EN
C11
Vcc
20
V IN
19
V IN
18
V IN
17
V IN
16
V IN
15
V IN
14
VD
13
SCP
12
EN
11
Vcc
Vo
Vo
Vo
Vo
Vo
Vo
FB
NRCS GND
GND
1
2
3
4
5
6
7
8
9
10
C8
R6
R7
C1
C6
Component
R6/R7
C1
C11/C20
C8
C6
C13
Recommended
Value
3.3k /3.9k
22 μ F
1 μ F/10 μ F
0.01 μ F
1000pF
330pF
Programming Notes and Precautions
IC output voltage can be set with a configuration formula V FB × (R6+R7)/R7 using the
values for the internal reference output voltage (V FB ) and the output voltage resistors (R6,
R7). Select resistance values that will avoid the impact of the FB bias current ( ± 100nA).
The recommended total resistance value is 10K Ω .
To assure output voltage stability, please be certain the output capacitors are connected
between Vo pin and GND. 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 (V CC , V IN ) input pins. If the impedance of this power supply were to increase, input
voltage (V CC , V IN ) could become unstable, leading to oscillation or lowered ripple rejection
function. While a low-ESR 1 μ F/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.
The Short Circuit Protection (SCP) function and the Thermal Shut Down (TSD) function
are built into the IC. Constant current comes from the SCP pin when SCP function or TSD
function is operated. (SCP:4 μ A, TSD:20 μ A TYP.) The voltage occurred in SCP pin by
this current overstep the threshold voltage, the status of voltage becomes OFF. Capacitors
with low susceptibility to temperature (330pF or more) are recommended, in order to
assure a stable TSD delay setting time. In light of this information, please confirm the
capacitor value to prevent startup defective.
14/20
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