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1 Features

1? LM94022/-Q1 is AEC-Q100 Grade 0 qualified and

is Manufactured on an Automotive Grade Flow

? Low 1.5-V to 5.5-V Operation With Low 5.4-μA

Supply Current

? Push-Pull Output With ±50-μA Source Current

Capability

? Four Selectable Gains

? Very Accurate Over Wide Temperature Range of

?50°C to +150°C:

– ±1.5oC Temperature Accuracy for 20oC to

40oC Range

– ±1.8oC Temperature Accuracy for –50oC to

70oC Range

– ±2.1oC Temperature Accuracy for –50oC to

90oC Range

– ±2.7oC Temperature Accuracy for –50oC to

150oC Range

? Output is Short-Circuit Protected

? Extremely Small SC70 Package

? For the Similar Functionality in a TO-92 Package,

See LMT84, LMT85, LMT86, or LMT87

? Footprint Compatible With the Industry-Standard

LM20 Temperature Sensor

2 Applications

? Automotive

? Cell Phones

? Wireless Transceivers

? Battery Management

? Disk Drives

? Games

? Appliances

3 Description

The LM94022/-Q1 device is a precision analog output

CMOS integrated-circuit temperature sensor with

selectable linear negative temperature coefficient

(NTC). A class-AB output structure gives the

LM94022/-Q1 strong output source and sink current

capability for driving heavy transient loads such as

that presented by the input of a sample-and-hold

analog-to-digital converter. The low 5.4-μA supply current and 1.5-V operating voltage of the LM94022/-

Q1 make it ideal for battery-powered systems as well

as general temperature-sensing applications.

The Gain Select 1 (GS1) and Gain Select 0 (GS0)

logic inputs select one of four gains for the

temperature-to-voltage output transfer function: ?5.5

mV/°C, ?8.2 mV/°C, ?10.9 mV/°C, and ?13.6 mV/°C.

Selecting –5.5 mV/°C (GS1 and GS0 both tied low),

allows the LM94022/-Q1 to operate down to 1.5-V supply while measuring temperature over the full

range of ?50°C to +150°C. Maximum temperature

sensitivity, –13.6 mV/°C, is selected when GS1 and

GS0 are both tied high. The gain-select inputs can be

tied directly to VDD or Ground without any pullup or pulldown resistors, reducing component count and

board area. These inputs can also be driven by logic

signals allowing the system to optimize the gain

during operation or system diagnostics.