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參數(shù)資料
| 型號(hào)： | LM4125 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Precision Micropower Low Dropout Voltage Reference |
| 中文描述： | 精密微功耗低壓差電壓基準(zhǔn) |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 300K |
| 代理商： | LM4125 |
Pin Functions
Output (Pin 5):
Reference Output.
Input (Pin 4):
Positive Supply.
Ground (Pin 2):
Negative Supply or Ground Connection.
Application Hints
The standard application circuit for the LM4125 is shown in
Figure 1
. It is designed to be stable with ceramic output
capacitors in the range of 0.022μF to 0.1μF. Note that
0.022μF is the minimum required output capacitor. These
capacitors typically have an ESR of about 0.1 to 0.5
.
Smaller ESR can be tolerated, however larger ESR can not.
The output capacitor can be increased to improve load tran-
sient response, up to about 1μF. However, values above
0.047μF must be tantalum. With tantalum capacitors, in the
1μF range, a small capacitor between the output and the
reference pin is required. This capacitor will typically be in
the 50pF range. Care must be taken when using output
capacitors of 1μF or larger. These application must be thor-
oughly tested over temperature, line and load.
An input capacitor is typically not required. However, a 0.1μF
ceramic can be used to help prevent line transients from
entering the LM4125. Larger input capacitors should be
tantalum or aluminium.
The typical thermal hysteresis specification is defined as the
change in +25C voltage measured after thermal cycling.
The device is thermal cycled to temperature -40C and then
measured at 25C. Next the device is thermal cycled to
temperature +125C and again measured at 25C. The re-
sulting V
delta shift between the 25C measurements is
thermal hysteresis. Thermal hysteresis is common in preci-
sion references and is induced by thermal-mechanical pack-
age stress. Changes in environmental storage temperature,
operating temperature and board mounting temperature are
all factors that can contribute to thermal hysteresis.
INPUT CAPACITOR
Noise on the power-supply input can effect the output noise,
but can be reduced by using an optional bypass capacitor
between the input pin and the ground.
PRINTED CIRCUIT BOARD LAYOUT CONSIDERATION
The mechanical stress due to PC board mounting can cause
the output voltage to shift from its initial value. References in
SOT packages are generally less prone to assembly stress
than devices in Small Outline (SOIC) package.
To reduce the stress-related output voltage shifts, mount the
reference on the low flex areas of the PC board such as near
to the edge or the corner of the PC board.
20069832
FIGURE 1.
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4125A-4.1 WAF | 制造商:Texas Instruments 功能描述: |
| LM4125AIM5-2.0 | 制造商:Texas Instruments 功能描述:IC SM VOLT REF LDO 0.2%TOL |
| LM4125AIM5-2.0/NOPB | 功能描述:IC VREF SERIES PREC SOT-23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:PowerWise® 標(biāo)準(zhǔn)包裝:1 系列:- 基準(zhǔn)類型:串聯(lián)，精度 輸出電壓:4.5V 容差:±800µV 溫度系數(shù):1ppm/°C 輸入電壓:13.5 V ~ 22 V 通道數(shù):1 電流 - 陰極:- 電流 - 靜態(tài):7mA 電流 - 輸出:10mA 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:20-LCC 供應(yīng)商設(shè)備封裝:20-CLCC 包裝:管件 |
| LM4125AIM5-2.5 | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| LM4125AIM5-2.5/NOPB | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
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