National Semiconductor LM94023 Technical data

September 10, 2008

LM94023

1.5V, micro SMD, Dual-Gain Analog Temperature Sensor with Class AB Output

Battery Management

General Description

The LM94023 is a precision analog output CMOS integratedcircuit temperature sensor that operates at a supply voltage as low as 1.5 Volts. Available in the very small four-bump microSMD 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-tovoltage 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 V 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.

Applications

Cell phones

■

Wireless Transceivers

■

Automotive

■

Disk Drives

■

Games

■

Appliances

■

Features

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 microSMD package

■

Footprint compatible with the industry-standard LM20

■

temperature sensor

Key Specifications

■ Supply Voltage

■ Supply Current

■ Output Drive

■ Temperature

Accuracy

■ Operating

Temperature −50°C to 150°C

20°C to 40°C

-50°C to 70°C

-50°C to 90°C

-50°C to 150°C

1.5V to 5.5V

5.4 μA (typ)

±50 μA

±1.5°C ±1.8°C ±2.1°C ±2.7°C

LM94023 1.5V, micro SMD, Dual-Gain Analog Temperature Sensor with Class AB Output

Connection Diagram

micro SMD

See NS Package Number TMD04AAA

Top View

30075001

Typical Transfer Characteristic

Output Voltage vs Temperature

30075024

Typical Application

LM94023

Full-Range Celsius Temperature Sensor (−50°C to +150°C) Operating from a Single Battery Cell

30075002

Ordering Information

Order Temperature NS Package Device

Number Accuracy Number Marking Transport Media

LM94023BITME ±1.5°C to ±2.7°C TMD04AAA Date Code 250 Units on Tape and Reel

LM94023BITMX ±1.5°C to ±2.7°C TMD04AAA Date Code 3000 Units on Tape and Reel

Pin Descriptions

Label Pin Number Type Equivalent Circuit Function

GS A1 Logic Input Gain Select - Input for

selecting the slope of the analog output response

GND A2 Ground Power Supply Ground

OUT

B1 Analog Output Outputs a voltage

which is inversely proportional to temperature

B2 Power

Positive Supply Voltage

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LM94023

Absolute Maximum Ratings (Note 1)

Supply Voltage −0.3V to +6.0V Voltage at Output Pin −0.3V to (VDD + 0.3V)

Output Current ±7 mA Voltage at GS Input Pin −0.3V to +6.0V Input Current at any pin (Note 2) 5 mA Storage Temperature −65°C to +150°C Maximum Junction Temperature

)

JMAX

ESD Susceptibility (Note 3): Human Body Model 2500V

+150°C

Machine Model 250V

Soldering process must comply with National's Reflow Temperature Profile specifications. Refer to www.national.com/packaging. (Note 4)

Operating Ratings (Note 1)

Specified Temperature Range:

LM94023

Supply Voltage Range (VDD)

Thermal Resistance (θJA) LM94023BITME, LM94023BITMX 122.6°C/W

≤ TA ≤ T

MIN

−50°C ≤ TA ≤ +150°C

+1.5 V to +5.5 V

Accuracy Characteristics

These limits do not include DC load regulation. These stated accuracy limits are with reference to the values in the LM94023 Transfer Table.

Parameter Conditions Limits

(Note 7)

Temperature Error (Note 8)

GS=0 TA = +20°C to +40°C; VDD = 1.5V to 5.5V ±1.5 °C (max)

TA = +0°C to +70°C; VDD = 1.5V to 5.5V ±1.8 °C (max)

TA = +0°C to +90°C; VDD = 1.5V to 5.5V ±2.1 °C (max)

TA = +0°C to +120°C; VDD = 1.5V to 5.5V ±2.4 °C (max)

TA = +0°C to +150°C; VDD = 1.5V to 5.5V ±2.7 °C (max)

TA = −50°C to +0°C; VDD = 1.6V to 5.5V ±1.8 °C (max)

GS=1 TA = +20°C to +40°C; VDD = 1.8V to 5.5V ±1.5 °C (max)

TA = +0°C to +70°C; VDD = 1.9V to 5.5V ±1.8 °C (max)

TA = +0°C to +90°C; VDD = 1.9V to 5.5V ±2.1 °C (max)

TA = +0°C to +120°C; VDD = 1.9V to 5.5V ±2.4 °C (max)

TA = +0°C to +150°C; VDD = 1.9V to 5.5V ±2.7 °C (max)

TA = −50°C to +0°C; VDD = 2.3V to 5.5V ±1.8 °C (max)

MAX

Units

(Limit)

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Electrical Characteristics

Unless otherwise noted, these specifications apply for +VDD = +1.5V to +5.5V. Boldface limits apply for TA = TJ = T

LM94023

; all other limits TA = TJ = 25°C.

MAX

Symbol Parameter Conditions Typical

(Note 6)

Limits

(Note 7)

Sensor Gain GS = 0 -5.5 mV/°C

GS = 1 -8.2 mV/°C

Load Regulation

(Note 10)

Line Regulation

1.5V ≤ VDD < 5.5V Source ≤ 50 μA,

(VDD - V

) ≥ 200mV

OUT

Sink ≤ 50 μA,

≥ 200mV

OUT

200

-0.22 -1 mV (max)

0.26 1 mV (max)

(Note 13)

Power-on Time

Supply Current TA = +30°C to +150°C,

(VDD - V

) ≥ 100mV

OUT

TA = -50°C to +150°C,

(VDD - V

) ≥ 100mV

OUT

5.4 8.1

5.4 9

Output Load Capacitance 1100 pF (max)

CL= 0 pF to 1100 pF 0.7 1.9 ms (max)

(Note 11)

GS1 and GS0 Input Logic

VDD- 0.5V V (min)

"1" Threshold Voltage

GS1 and GS0 Input Logic

0.5 V (max)

"0" Threshold Voltage

Logic "1" Input Current

0.001 1

(Note 12)

Logic "0" Input Current

0.001 1

(Note 12)

MIN

Units

(Limit)

μV/V

μA (max)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions.

Note 2: When the input voltage (VI) at any pin exceeds power supplies (VI < GND or VI > V+), the current at that pin should be limited to 5 mA.

Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged

directly into each pin.

Note 4: Reflow temperature profiles are different for lead-free and non-lead-free packages.

Note 5: The junction to ambient thermal resistance (θJA) is specified without a heat sink in still air.

Note 6: Typicals are at TJ = TA = 25°C and represent most likely parametric norm.

Note 7: Limits are guaranteed to National's AOQL (Average Outgoing Quality Level).

Note 8: Accuracy is defined as the error between the measured and reference output voltages, tabulated in the Transfer Table at the specified conditions of

supply gain setting, voltage, and temperature (expressed in °C). Accuracy limits include line regulation within the specified conditions. Accuracy limits do not include load regulation; they assume no DC load.

Note 9: Changes in output due to self heating can be computed by multiplying the internal dissipation by the thermal resistance.

Note 10: Source currents are flowing out of the LM94023. Sink currents are flowing into the LM94023.

Note 11: Guaranteed by design.

Note 12: The input current is leakage only and is highest at high temperature. It is typically only 0.001µA. The 1µA limit is solely based on a testing limitation and

does not reflect the actual performance of the part.

Note 13: Line regulation (DC) is calculated by subtracting the output voltage at the highest supply voltage from the output voltage at the lowest supply voltage. The typical DC line regulation specification does not include the output voltage shift discussed in Section 5.0.

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Typical Performance Characteristics

LM94023

Temperature Error vs. Temperature

Supply Current vs. Temperature

Minimum Operating Temperature vs. Supply Voltage

30075007

30075006

Supply Current vs. Supply Voltage

30075004

30075005

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