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1FEATURES

2? Low 1.5V Operation

? Push-pull Output with 50μA Source Current

Capability

? Two Selectable Gains

? Very Accurate Over Wide Temperature Range

of ?50°C to +150°C

? Low Quiescent Current

? Output is Short-circuit Protected

? Extremely Small DSBGA Package

? Footprint Compatible with the Industry-

standard LM20 Temperature Sensor

APPLICATIONS

? Cell Phones

? Wireless Transceivers

? Battery Management

? Automotive

? Disk Drives

? Games

? Appliances

KEY SPECIFICATIONS

? Supply Voltage 1.5V to 5.5V

? Supply Current 5.4 μA (typ)

? Output Drive ±50 μA

? Temperature Accuracy

– 20°C to 40°C ±1.5°C

– –50°C to 70°C ±1.8°C

– –50°C to 90°C ±2.1°C

– –50°C to 150°C ±2.7°C

? Operating Temperature ?50°C to 150°C

DESCRIPTION

The LM94023 is a precision analog output CMOS

integrated-circuit temperature sensor that operates at

a supply voltage as low as 1.5 Volts. Available in the

very small four-bump DSBGA 0.8mm x 0.8mm) the

LM94023 occupies very little board area. A class-AB

output structure gives the LM94023 strong output

source and sink current capability for driving heavy

loads, making it well suited to source the input of a

sample-and-hold analog-to-digital converter with its

transient load requirements, This generally means the

LM94023 can be used without external components,

like resistors and buffers, on the output. While

operating over the wide temperature range of ?50°C

to +150°C, the LM94023 delivers an output voltage

that is inversely porportional to measured

temperature. The LM94023's low supply current

makes it ideal for battery-powered systems as well as

general temperature sensing applications.

A Gain Select (GS) pin sets the gain of the

temperature-to-voltage output transfer function. Either

of two slopes are selectable: ?5.5 mV/°C (GS=0) or

?8.2 mV/°C (GS=1). In the lowest gain configuration,

the LM94023 can operate with a 1.5V supply while

measuring temperature over the full ?50°C to +150°C

operating range. Tying GS high causes the transfer

function to have the largest gain for maximum

temperature sensitivity. The gain-select inputs can be

tied directly to VDD or Ground without any pull-up or

pull-down 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.