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參數(shù)資料
| 型號： | REF3125AIDBZT |
| 英文描述： | 15ppm/C Max, 100UA, SOT23-3 SERIES VOLTAGE REFERENCE |
| 中文描述： | 百萬分之十五/ C最大，100uA的，采用SOT23 - 3系列電壓基準 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 250K |
| 代理商： | REF3125AIDBZT |
REF3112, 3120, 3125, 3130, 3133, 3140
SBVS046A
7
www.ti.com
THEORY OF OPERATION
The REF31xx is a family of series, CMOS, precision bandgap
voltage references. The basic bandgap topology is shown in
Figure 1. Transistors Q
1
and Q
2
are biased such that the
current density of Q
1
is greater than that of Q
2
. The difference
of the two base-emitter voltages, Vbe
1
–
Vbe
2
, has a positive
temperature coefficient and is forced across resistor R
1
. This
voltage is gained up and added to the base-emitter voltage
of Q
2
, which has a negative temperature coefficient. The
resulting output voltage is virtually independent of temperature.
100
μ
A, and the maximum quiescent current over temperature
is just 135
μ
A. The quiescent current typically changes less
than 2
μ
A over the entire supply range, as shown in Figure 3.
1
3
REF31xx
2
0.47
μ
F
V
IN
V
OUT
FIGURE 1. Simplified Schematic of Bandgap Reference.
FIGURE 2. Typical Connections for Operating REF31xx.
FIGURE 3. Supply Current vs Supply Voltage.
R
1
Q
2
Q
1
I
N
+
Vbe
1
–
+
Vbe
2
–
V
BANDGAP
APPLICATION INFORMATION
The REF31xx does not require a load capacitor and is stable
with any capacitive load. Figure 2 shows typical connections
required for operation of the REF31xx. A supply bypass
capacitor of 0.47
μ
F is recommended.
SUPPLY VOLTAGE
The REF31xx family of references features an extremely low
dropout voltage. With the exception of the REF3112, which
has a minimum supply requirement of 1.8V, these references
can be operated with a supply of only 5mV above the output
voltage in an unloaded condition. For loaded conditions, a
typical dropout voltage versus load is shown in the typical
curves.
The REF31xx features a low quiescent current, which is
extremely stable over changes in both temperature and
supply. The typical room temperature quiescent current is
Supply voltages below the specified levels can cause the
REF31xx to momentarily draw currents greater than the
typical quiescent current. This can be prevented by using a
power supply with a fast rising edge and low output impedance.
THERMAL HYSTERESIS
Thermal hysteresis for the REF31xx is defined as the change
in output voltage after operating the device at 25
°
C, cycling
the device through the specified temperature range, and
returning to 25
°
C. It can be expressed as:
V
absV
V
V
ppm
(
HYST
PRE
POST
NOM
=
)
–
10
6
Where: V
HYST
=
Thermal hysteresis
V
PRE
= Output voltage measured at 25
°
C pre-
temperature cycling
V
POST
= Output voltage measured after the device
has been cycled through the specified temperature
range of
–
40
°
C to +125
°
C and returned to 25
°
C.
TEMPERATURE DRIFT
The REF31xx is designed to exhibit minimal drift error, defined
as the change in output voltage over varying temperature. The
drift is calculated using the
“
box
”
method which is described by
the following equation:
V
V
V
TemperatureRange
ppm
OUTMAX
OUTMIN
OUT
–
10
6
The REF31xx features a typical drift coefficient of 5ppm from
0
°
C to 70
°
C
—
the primary temperature range for many
applications. For the industrial temperature range of
–
40
°
C to
125
°
C, the REF31xx family drift increases to a typical value of
10ppm.
QUIESCENT CURRENT vs POWER SUPPLY
100.5
100.0
99.5
99.0
98.5
98.0
Q
μ
A
1.5
Power Supply (V)
2.5
3.5
4.5
5.5
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| REF3112 | 15ppm/C Max, 100UA, SOT23-3 SERIES VOLTAGE REFERENCE |
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| REF3112AIDBZT | 15ppm/C Max, 100UA, SOT23-3 SERIES VOLTAGE REFERENCE |
| REF3120 | 15ppm/C Max, 100UA, SOT23-3 SERIES VOLTAGE REFERENCE |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REF3125AIDBZTG4 | 功能描述:基準電壓& 基準電流 20ppm/DegC 100uA SOT23-3 Series RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度: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 |
| REF3125AQDBZRQ1 | 功能描述:SERIES VOLTAGE REFERENCE 制造商:texas instruments 系列:* 包裝:剪切帶（CT） 零件狀態(tài):在售 安裝類型:表面貼裝 封裝/外殼:TO-236-3，SC-59，SOT-23-3 供應(yīng)商器件封裝:SOT-23-3 標準包裝:1 |
| REF3130 | 制造商:BB 制造商全稱:BB 功能描述:15ppm/C Max, 100UA, SOT23-3 SERIES VOLTAGE REFERENCE |
| REF3130AIDBZR | 功能描述:基準電壓& 基準電流 20ppm/DegC 100uA SOT23-3 Series RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度: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 |
| REF3130AIDBZRG4 | 功能描述:基準電壓& 基準電流 20ppm/DegC 100uA SOT23-3 Series RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓撲結(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準確度: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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