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| 型号： | LT1790BCS6-2.5 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 2.5V Micropower SOT-23 Low Dropout Reference |
| 中文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO6 |
| 封装： | PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 6/8页 |
| 文件大小： | 172K |
| 代理商： | LT1790BCS6-2.5 |
6
LT1790-2.5
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Figure 6. LT1790-2.5 Sinking –4mA to –5mA
6V
4V
2V
0V
V
GEN
8V
V
OUT
1790 F06
Positive or Negative Operation
Series operation is ideal for extending battery life. If the
LT1790-2.5 is operated in series mode it does not require
an external current setting resistor. The specifications
guarantee the LT1790-2.5 operates from 2.6V to 18V.
When the circuitry being regulated does not demand
current, the series connected LT1790-2.5 consumes only
a few hundred
μ
W, yet the same connection can sink or
source 5mA of load current when demanded. A typical
series connection is shown on the front page of this data
sheet.
The circuit in Figure 7 shows the connection for a –2.5V
reference. The LT1790-2.5 can be used as a very stable
negative reference, however, it requires a positive voltage
applied to Pin 4 to bias internal circuitry. This voltage
must be current limited with R1 to keep the output PNP
transistor from turning on and driving the grounded
output. C1 provides stability during load transients. This
connection maintains the accuracy and temperature coef-
ficient of the positive connected LT1790-2.5.
Long-Term Drift
Long-term drift cannot be extrapolated from acceler-
ated high temperature testing. This erroneous tech-
nique gives drift numbers that are widely optimistic. The
only way long-term drift can be determined is to mea-
sure it over the time interval of interest.
The LT1790S6
drift data was taken on over 100 parts that were soldered
into PC boards similar to a “real world” application. The
boards were then placed into a constant temperature oven
with T
A
= 30
°
C, their outputs scanned regularly and
measured with an 8.5 digit DVM. Long-term drift curves
are shown in the Typical Performance Characteristics.
Hysteresis
Hysteresis data shown in Figures 8 and 9 represent the
worst-case data taken on parts from 0
°
C to 70
°
C and from
–40
°
C to 85
°
C. Units were cycled several times over these
temperature ranges and the largest change is shown. As
expected, the parts cycled over the higher temperature
range have higher hysteresis than those cycled over the
lower range.
When the LT1790-2.5 is IR reflow soldered onto a PC
board, the output shift is typically just 150ppm (0.015%).
LT1790-2.5
C
L
1
μ
F
C1
0.1
μ
F
1790 F07
4
1, 2
6
R1
10k
V
OUT
= –2.5V
V
EE
3V
R
L
=V
EE
– 2.5V
125
μ
A
Figure 7. Using the LT1790-2.5 to Build a –2.5V Reference
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1790BCS6-3 | 制造商:Linear Technology 功能描述:V-Ref Precision 3V 6-Pin TSOT-23 |
| LT1790BCS6-3#PBF | 制造商:Linear Technology 功能描述:IC LDO SERIES V-REF 3V 0.1% 6-SOT-23 制造商:Linear Technology 功能描述:IC, LDO SERIES V-REF, 3V, 0.1%, 6-SOT-23 制造商:Linear Technology 功能描述:IC, LDO SERIES V-REF, 3V, 0.1%, 6-SOT-23; Topology:Series; Input Voltage Min:3.5V; Input Voltage Max:18V; Reference Voltage:3V; Reference Voltage Tolerance:8.25mV; Voltage Reference Case Style:SOT-23; No. of Pins:6; Output Voltage:3V;RoHS Compliant: Yes |
| LT1790BCS6-3#TR | 功能描述:IC VREF SERIES 3V SOT-23-6 RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 产品培训模块:Voltage Reference Basics 标准包装:100 系列:- 基准类型:旁路，精度 输出电压:4.096V 容差:±0.075% 温度系数:50ppm/°C 输入电压:- 通道数:1 电流 - 阴极:1µA 电流 - 静态:- 电流 - 输出:10mA 工作温度:0°C ~ 70°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 |
| LT1790BCS6-3#TRM | 功能描述:IC VREF SERIES 3V SOT-23-6 RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 产品培训模块:Voltage Reference Basics 标准包装:100 系列:- 基准类型:旁路，精度 输出电压:4.096V 容差:±0.075% 温度系数:50ppm/°C 输入电压:- 通道数:1 电流 - 阴极:1µA 电流 - 静态:- 电流 - 输出:10mA 工作温度:0°C ~ 70°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 |
| LT1790BCS6-3#TRMPBF | 功能描述:IC VREF SERIES 3V SOT-23-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:3,000 系列:- 基准类型:旁路，精度 输出电压:3V 容差:±0.5% 温度系数:100ppm/°C 输入电压:- 通道数:1 电流 - 阴极:82µA 电流 - 静态:- 电流 - 输出:15mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-TSSOP（5 引线），SC-88A，SOT-353 供应商设备封装:SC-70-5 包装:带卷 (TR) 其它名称:296-20888-2 |
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