参数资料
| 型号： | SPX2954S-L-3-3 |
| 厂商： | Exar Corporation |
| 文件页数： | 9/17页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V .25A 8SOIC |
| 标准包装： | 98 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 30V |
| 电压 - 压降（标准）： | 0.31V @ 250mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 250mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
APPLICATIONS HINTS ( CONT )
+V IN
upper limit of 1.2M ? on value of R 2 . If no load
is presented the I FB produces an error of typically
2% in V OUT which may be eliminated at room
temperature by trimming R 1 . To improve the
accuracy choose the value of R 2 = 100k this
reduces the error by 0.17% and increases the
resistor program current by 12 μ A. Since the
SPX2954 typically draws 60 μ A at no load with
470K ?
470k ?
3
5
______
ERROR
SD
8
+V IN
SPX2954
V OUT
1
R 1
V OUT
+
1 μ F
Pin 2 open-circuited, this is a small price to pay.
RESET
GND
4
FB
7
REDUCING OUTPUT NOISE
It may be an advantage to reduce the AC noise
present at the output. One way is to reduce the
regulator bandwidth by increasing the size of the
output capacitor. This is the only way that noise
can be reduced on the 3 lead SPX2954 but is
relatively inefficient, as increasing the capacitor
R 2
Figure 2. Latch Off when Error Flag Occurs
+V IN
from 1 μ F to 220 μ F only decreases the noise
from 430 μ V to 160 μ VRMS for a 100kHz band-
width at 5V output. Noise can be reduced four-
fold by using a bypass capacitor across R 1 , since
it reduces the high frequency gain from 4 to
ERROR
OUTPUT
5
______
ERROR
8
+V IN
SPX2954
V OUT
1
*V OUT = V IN
unity. Pick
C BYPASS ? (1 / 2 π R 1 x 200 Hz)
SHUTDOWN
INPUT
3
SD
GND
4
FB
7
or choose 0.01 μ F. When doing this, the output
capacitor must be increased to 3.3 μ F to maintain
stability. These changes reduce the output noise
from 430 μ V to 100 μ V RMS for a 100kHz band-
width at 5V output. With the bypass capacitor
added, noise no longer scales with output volt-
age so that improvements are more dramatic at
higher output voltages.
4.75V
OUTPUT
VOLTAGE
_______
ERROR*
*MINIMUM INPUT-OUTPUT VOLTAGE RANGES FROM 40mV to 400mV.
DEPENDING ON LOAD CURRENT.
Figure 3. Wide Imput Voltage Range, Current Limiter
+ 5.0V
+
INPUT
VOLTAGE
+ 1.3V
+
* See Application Info.
Figure 1. Error Output Timing
Date: 12/9/05
SPX2954, 250mA Low Dropout Voltage Regulator
9
? Copyright 2005 Sipex Corporation
相关PDF资料 |
PDF描述 |
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| AP1115AY15L-13 | IC REG LDO 1.5V .6A SOT89-3 |
| SPX2954AS-L-5-0 | IC REG LDO 5V .25A 8SOIC |
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| RMM24DRTI | CONN EDGECARD 48POS DIP .156 SLD |
| SPX2815AT-L-3-3/TR | IC REG LDO 3.3V 1.5A TO263-3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SPX2954S-L-3-3/TR | 功能描述:低压差稳压器 - LDO 250mA LOW DROPOUT 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 |
| SPX2954S-L-5-0 | 功能描述:低压差稳压器 - LDO 250mA LOW DROPOUT 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 |
| SPX2954S-L-5-0/TR | 功能描述:低压差稳压器 - LDO 250mA LOW DROPOUT 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 |
| SPX2954T-3.3 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:250mA Low Dropout Voltage Regulator |
| SPX2954T-3-3 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:250mA Low Dropout Voltage Regulator |
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