Datasheet > LM20_05

LM20_05

更新时间： 2024-11-11 04:20:15

品牌	Logo	应用领域
美国国家半导体 - NSC		传感器温度传感器
页数	文件大小	规格书
10页	652K
描述
2.4V, 10レA, SC70, micro SMD Temperature Sensor

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LM20_05 数据手册

October 2005

LM20

2.4V, 10µA, SC70, micro SMD Temperature Sensor

n Battery Management

n FAX Machines

The LM20 is a precision analog output CMOS integrated-

n Printers

General Description

circuit temperature sensor that operates over a −55˚C to

+130˚C temperature range. The power supply operating

n HVAC

n Disk Drives

n Appliances

range is +2.4 V to +5.5 V. The transfer function of LM20 is

predominately linear, yet has a slight predictable parabolic

curvature. The accuracy of the LM20 when specified to a

parabolic transfer function is 1.5˚C at an ambient tempera-

ture of +30˚C. The temperature error increases linearly and

reaches a maximum of 2.5˚C at the temperature range

extremes. The temperature range is affected by the power

supply voltage. At a power supply voltage of 2.7 V to 5.5 V

the temperature range extremes are +130˚C and −55˚C.

Decreasing the power supply voltage to 2.4 V changes the

negative extreme to −30˚C, while the positive remains at

+130˚C.

Features

n Rated for full −55˚C to +130˚C range

n Available in an SC70 and 2 micro SMD packages

n Predictable curvature error

n Suitable for remote applications

Key Specifications

Accuracy at +30˚C

Accuracy at +130˚C & −55˚C

Power Supply Voltage Range

Current Drain

1.5 to 4 ˚C (max)

2.5 to 5 ˚C (max)

+2.4V to +5.5V

10 µA (max)

The LM20’s quiescent current is less than 10 µA. Therefore,

self-heating is less than 0.02˚C in still air. Shutdown capa-

bility for the LM20 is intrinsic because its inherent low power

consumption allows it to be powered directly from the output

of many logic gates or does not necessitate shutdown at all.

Nonlinearity

0.4 % (typ)

Output Impedance

Load Regulation

160 Ω (max)

Applications

n Cellular Phones

n Computers

0 µA I_L+16 µA

−2.5 mV (max)

n Power Supply Modules

Typical Application

Full-Range Celsius (Centigrade) Temperature Sensor (−55˚C to +130˚C)

Operating from a Single Li-Ion Battery Cell

Output Voltage vs Temperature

10090802

V_O= (−3.88x10⁻⁶xT²) + (−1.15x10⁻²xT) + 1.8639

10090824

where:

T is temperature, and V is the measured output voltage of the LM20.

DS100908

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