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参数资料
| 型号： | LP2951 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 线性稳压 |
| 英文描述： | 100 mA, Low Power Low Dropout Voltage Regulator(100mA,低功耗，低压差稳压器) |
| 中文描述： | 100毫安，低功耗，低压差稳压器（100mA的，低功耗，低压差稳压器） |
| 文件页数： | 2/24页 |
| 文件大小： | 244K |
| 代理商： | LP2951 |
LP2950, LP2951, NCV2951
http://onsemi.com
10
Figure 19. Adjustable Regulator
Error
Output
Shutdown
Input
Vin
Vout
1.23 to 30 V
3.3
mF
0.01
mF
NC
R2
R1
100 k
5
3
Error
SD
GND
FB
47
6
VO T
SNS
2
Vout
Vin
8
1
The complete equation for the output voltage is:
Vout + Vref (1 ) R1 R2) ) IFB R1
where Vref is the nominal 1.235 V reference voltage and IFB
is the feedback pin bias current, nominally -20 nA. The
minimum recommended load current of 1.0
mA forces an
upper limit of 1.2 M
W on the value of R2, if the regulator
must work with no load. IFB will produce a 2% typical error
in Vout which may be eliminated at room temperature by
adjusting R1. For better accuracy, choosing R2 = 100 k
reduces this error to 0.17% while increasing the resistor
program current to 12
mA. Since the LP2951 typically draws
75
mA at no load with Pin 2 open circuited, the extra 12 mA
of current drawn is often a worthwhile tradeoff for
eliminating the need to set output voltage in test.
Output Noise
In many applications it is desirable to reduce the noise
present at the output. Reducing the regulator bandwidth by
increasing the size of the output capacitor is the only method
for reducing noise on the 3 lead LP2950. However,
increasing the capacitor from 1.0
mF to 220 mF only
decreases the noise from 430
mV to 160 mVrms for a 100 kHz
bandwidth at the 5.0 V output.
Noise can be reduced fourfold by a bypass capacitor
across R1, since it reduces the high frequency gain from 4
to unity. Pick
C
Bypass [
1
2
pR1x200Hz
or about 0.01
mF. When doing this, the output capacitor must
be increased to 3.3
mF to maintain stability. These changes
reduce the output noise from 430
mV to 126 mVrms for a
100 kHz bandwidth at 5.0 V output. With bypass
capacitor added, noise no longer scales with output voltage
so that improvements are more dramatic at higher output
voltages.
Figure 20. 1.0 A Regulator with 1.2 V Dropout
0.01
mF
10 k
MTB23P06E
1.0
mF
Unregulated
Input
Error
Output
Shutdown
Input
Vout
5.0 V
±1.0%
0 to 1.0 A
220
mF
2.0 k
5
3
Error
SD
GND FB
47
6
VO T
SNS
2
Vout
Vin
8
1
0.002
mF
1.0 M
LP2951CN
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LP2951-01AJ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Fixed & Adjustable Voltage Regulator |
| LP2951-02BJ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Fixed & Adjustable Voltage Regulator |
| LP295102BM | 制造商:Micrel Inc 功能描述: |
| LP2951-02BM | 功能描述:IC REG LDO ADJ .1A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 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:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| LP2951-02BM TR | 功能描述:IC REG LDO ADJ .1A 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 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:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
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