参数资料
| 型号： | SPX5205M5-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .15A SOT23-5 |
| 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： | 2.5 V ~ 16 V |
| 电压 - 压降（标准）： | 0.21V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | SPX5205M5-L/TR-ND |
SPX5205
150mA, Low-Noise LDO Voltage Regulator
REV. H
APPLICATION INFORMATION
The SPX5205 requires an output capacitor for
device stability. Its value depends upon the
application circuit. In general, linear regulator
stability decreases with higher output currents.
In applications where the SPX5205 is putting
out less current, a lower output capacitance may
be sufficient. For example, a regulator sourcing
only 10mA, requires approximately half the
capacitance as the same regulator sourcing
150mA.
Bench testing is the best method for determining
the proper type and value of the capacitor since
the high frequency characteristics of electro-
lytic capacitors vary widely, depending on type
and manufacturer. A high quality 2.2 μ F alumi-
num electrolytic capacitor works in most appli-
cation circuits, but the same stability often can
be obtained with a 1 μ F tantalum electrolytic.
With the SPX5205 adjustable version, the mini-
mum value of output capacitance is a function of
the output voltage. The value decreases with
higher output voltages, since closed loop gain is
increased.
portional to the size of the BYP capacitor. Ap-
plications requiring a slow ramp-up of the out-
put voltage should use a larger C BYP . However,
if a rapid turn-on is necessary, the BYP capaci-
tor can be omitted.
The SPX5205’s internal reference is available
through the BYP pin.
The Typical Application Circuit shown on page
1 represents a SPX5205 standard application
circuit. The EN (enable) pin is pulled high
(>2.0V) to enable the regulator. To disable the
regulator, EN < 0.4V.
The SPX5205 in Figure 1 illustrates a typical
adjustable output voltage configuration. Two
resistors (R1 and R2) set the output voltage. The
output voltage is calculated using the formula:
V OUT = 1.235V x ( 1 + R1/R2)
Typical Applications Circuits
R2 must be > 10 k
and for best results, R2
A 10nF capacitor on BYP pin will significantly
reduce output noise but it may be left uncon-
nected if the output noise is not a major concern.
The SPX5205 start-up speed is inversely pro-
should be between 22 k and 47k . A capacitor
placed between adjustable and ground will pro-
vide improved noise performance.
V IN
+
GND
1
2
3
SPX5205
5
4
ADJ
R1
+
V OUT
EN
Hi-ON
Lo-OFF
BYP
(Optn)
R2
TOP View
Figure 1. Typical Adjustable Output Voltage.
6
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