NSC LM26LV, LM26LVCISD-XPE Datasheet

July 2007

LM26LV

1.6 V, LLP-6 Factory Preset Temperature Switch and Temperature Sensor

General Description

The LM26LV is a low-voltage, precision, dual-output, lowpower temperature switch and temperature sensor. The temperature trip point (T

TRIP

) can be preset at the factory to any temperature in the range of 0°C to 150°C in 1°C increments. Built-in temperature hysteresis (T

HYST

) keeps the output sta-

ble in an environment of temperature instability. In normal operation the LM26LV temperature switch outputs

assert when the die temperature exceeds T

TRIP

. The temperature switch outputs will reset when the temperature falls below a temperature equal to (T

TRIP

− T

HYST

). The OVERTEMP digital output, is active-high with a push-pull structure, while the OVERTEMP

digital output, is active-low

with an open-drain structure. An analog output, V

TEMP

, delivers an analog output voltage

which is inversely proportional to the measured temperature. Driving the TRIP TEST input high: (1) causes the digital out-

puts to be asserted for in-situ verification and, (2) causes the threshold voltage to appear at the V

TEMP

output pin, which

could be used to verify the temperature trip point. The LM26LV's low minimum supply voltage makes it ideal for

1.8 Volt system designs. Its wide operating range, low supply current , and excellent accuracy provide a temperature switch solution for a wide range of commercial and industrial applications.

Applications

■

Cell phones

■

Wireless Transceivers

■

Digital Cameras

■

Personal Digital Assistants (PDA's)

■

Battery Management

■

Automotive

■

Disk Drives

■

Games

■

Appliances

Features

■

Low 1.6V operation

■

Low quiescent current

■

Push-pull and open-drain temperature switch outputs

■

Wide trip point range of 0°C to 150°C

■

Very linear analog V

TEMP

temperature sensor output

■

TEMP

output short-circuit protected

■

Accurate over −50°C to 150°C temperature range

■

2.2 mm by 2.5 mm (typ) LLP-6 package

■

Excellent power supply noise rejection

Key Specifications

■ Supply Voltage

1.6V to 5.5V

■ Supply Current

8 μA (typ)

■ Accuracy, Trip Point

Temperature

0°C to 150°C ±2.2°C

■ Accuracy, V

TEMP

0°C to 150°C ±2.3°C

0°C to 120°C ±2.2°C

−50°C to 0°C ±1.7°C

■ V

TEMP

Output Drive

±100 μA

■ Operating Temperature −50°C to 150°C

■ Hysteresis Temperature 4.5°C to 5.5°C

Connection Diagram

LLP-6

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Top View

See NS Package Number SDB06A

Typical Transfer Characteristic

TEMP

Analog Voltage vs Die Temperature

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LM26LV 1.6 V, LLP-6 Factory Preset Temperature Switch and Temperature Sensor

Block Diagram

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Pin Descriptions

Pin No.

Name Type Equivalent Circuit Description

TRIP

TEST

Digital

Input

TRIP TEST pin. Active High input. If TRIP TEST = 0 (Default) then: V

TEMP

= VTS, Temperature Sensor Output Voltage If TRIP TEST = 1 then: OVERTEMP and OVERTEMP outputs are asserted and V

TEMP

= V

TRIP

, Temperature Trip Voltage.

This pin may be left open if not used.

5 OVERTEMP

Digital

Output

Over Temperature Switch output Active High, Push-Pull Asserted when the measured temperature exceeds the Trip Point Temperature or if TRIP TEST = 1 This pin may be left open if not used.

3 OVERTEMP

Digital

Output

Over Temperature Switch output Active Low, Open-drain (See Section 2.1 regarding required pullup resistor.) Asserted when the measured temperature exceeds the Trip Point Temperature or if TRIP TEST = 1 This pin may be left open if not used.

TEMP

Analog Output

TEMP

Analog Voltage Output If TRIP TEST = 0 then V

TEMP

= VTS, Temperature Sensor Output Voltage If TRIP TEST = 1 then V

TEMP

= V

TRIP

, Temperature Trip Voltage

This pin may be left open if not used.

Power

Positive Supply Voltage

2 GND Ground Power Supply Ground

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LM26LV

Typical Application

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Ordering Information

Order Number

Temperature Trip

Point, °C

NS Package

Number

Top Mark Transport Media

LM26LVCISD-XPE 105°C SDB06A XPE 1000 Units on Tape and Reel

LM26LVCISDX-XPE 105°C SDB06A XPE 4500 Units on Tape and Reel

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LM26LV

Absolute Maximum Ratings (Note 1)

Supply Voltage −0.2V to +6.0V Voltage at OVERTEMP pin −0.2V to +6.0V Voltage at OVERTEMP and

TEMP

pins −0.2V to (VDD + 0.5V)

TRIP TEST Input Voltage −0.2V to (VDD + 0.5V)

Output Current, any output pin ±7 mA Input Current at any pin (Note 2) 5 mA Storage Temperature −65°C to +150°C Maximum Junction Temperature

J(MAX)

+155°C ESD Susceptibility (Note 3) : Human Body Model 2500V

Machine Model 250V Charged Device Model 1000V

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:

MIN

≤ TA ≤ T

MAX

LM26LV

−50°C ≤ TA ≤ +150°C

Supply Voltage Range (VDD)

+1.6 V to +5.5 V

Thermal Resistance (θJA) (Note 5) LLP-6 (Package SDB06A) 152 °C/W

Accuracy Characteristics

Trip Point Accuracy

Parameter Conditions

Limits

(Note 7)

Units

(Limit)

Trip Point Accuracy (Note 8) 0 − 150°C

VDD = 5.0 V

±2.2 °C (max)

TEMP

Analog Temperature Sensor Output Accuracy

There are four gains corresponding to each of the four Temperature Trip Point Ranges. Gain 1 is the sensor gain used for Temperature Trip Point 0 - 69°C. Likewise Gain 2 is for Trip Points 70 - 109 °C; Gain 3 for 110 - 129 °C; and Gain 4 for 130 - 150 °C. These limits do not include DC load regulation. These stated accuracy limits are with reference to the values in the LM26LV Conversion Table.

Parameter Conditions

Limits

(Note 7)

Units

(Limit)

TEMP

Temperature

Accuracy

(Note 8)

Gain 1: for Trip Point

Range 0 - 69°C

TA = 20°C to 40°C VDD = 1.6 to 5.5 V

±1.8

°C (max)

TA = 0°C to 70°C VDD = 1.6 to 5.5 V

±2.0

TA = 0°C to 90°C VDD = 1.6 to 5.5 V

±2.1

TA = 0°C to 120°C VDD = 1.6 to 5.5 V

±2.2

TA = 0°C to 150°C VDD = 1.6 to 5.5 V

±2.3

TA = −50°C to 0°C VDD = 1.7 to 5.5 V

±1.7

Gain 2: for Trip Point

Range 70 - 109°C

TA = 20°C to 40°C VDD = 1.8 to 5.5 V

±1.8

°C (max)

TA = 0°C to 70°C VDD = 1.9 to 5.5 V

±2.0

TA = 0°C to 90°C VDD = 1.9 to 5.5 V

±2.1

TA = 0°C to 120°C VDD = 1.9 to 5.5 V

±2.2

TA = 0°C to 150°C VDD = 1.9 to 5.5 V

±2.3

TA = −50°C to 0°C VDD = 2.3 to 5.5 V

±1.7

Gain 3: for Trip Point

Range 110 - 129°C

TA = 20°C to 40°C VDD = 2.3 to 5.5 V

±1.8

°C (max)

TA = 0°C to 70°C VDD = 2.5 to 5.5 V

±2.0

TA = 0°C to 90°C VDD = 2.5 to 5.5 V

±2.1

TA = 0°C to 120°C VDD = 2.5 to 5.5 V

±2.2

TA = 0°C to 150°C VDD = 2.5 to 5.5 V

±2.3

TA = −50°C to 0°C VDD = 3.0 to 5.5 V

±1.7

Gain 4: for Trip Point

Range 130 - 150°C

TA = 20°C to 40°C VDD = 2.7 to 5.5 V

±1.8

°C (max)

TA = 0°C to 70°C VDD = 3.0 to 5.5 V

±2.0

TA = 0°C to 90°C VDD = 3.0 to 5.5 V

±2.1

TA = 0°C to 120°C VDD = 3.0 to 5.5 V

±2.2

TA = 0°C to 150°C VDD = 3.0 to 5.5 V

±2.3

TA = −50°C to 0°C VDD = 3.6 to 5.5 V

±1.7

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LM26LV

Electrical Characteristics

Unless otherwise noted, these specifications apply for +VDD = +1.6V to +5.5V. Boldface limits apply for TA = TJ = T

MIN

MAX

; all other limits TA = TJ = 25°C.

Symbol Parameter Conditions Typical

(Note 6)

Limits

(Note 7)

Units

(Limit)

GENERAL SPECIFICATIONS

Quiescent Power Supply

Current

8 16

μA (max)

Hysteresis

5.5 °C (max)

4.5 °C (Min)

OVERTEMP DIGITAL OUTPUT ACTIVE HIGH, PUSH-PULL

Logic "1" Output Voltage

VDD ≥ 1.6V Source ≤ 340 μA

VDD − 0.2V

V (min)

VDD ≥ 2.0V Source ≤ 498 μA

VDD ≥ 3.3V Source ≤ 780 μA

VDD ≥ 1.6V Source ≤ 600 μA

VDD − 0.45V

V (min)

VDD ≥ 2.0V Source ≤ 980 μA

VDD ≥ 3.3V Source ≤ 1.6 mA

BOTH OVERTEMP and OVERTEMP DIGITAL OUTPUTS

Logic "0" Output Voltage

VDD ≥ 1.6V Sink ≤ 385 μA

0.2

V (max)

VDD ≥ 2.0V Sink ≤ 500 μA

VDD ≥ 3.3V Sink ≤ 730 μA

VDD ≥ 1.6V Sink ≤ 690 μA

0.45

VDD ≥ 2.0V Sink ≤ 1.05 mA

VDD ≥ 3.3V Sink ≤ 1.62 mA

OVERTEMP DIGITAL OUTPUT ACTIVE LOW, OPEN DRAIN

Logic "1" Output Leakage

Current (Note 12)

TA = 30 °C

0.001 1

μA (max)

TA = 150 °C

0.025

TEMP

ANALOG TEMPERATURE SENSOR OUTPUT

TEMP

Sensor Gain

Gain 1: If Trip Point = 0 - 69°C −5.1 mV/°C

Gain 2: If Trip Point = 70 - 109°C −7.7 mV/°C

Gain 3: If Trip Point = 110 - 129°C −10.3 mV/°C

Gain 4: If Trip Point = 130 - 150°C −12.8 mV/°C

TEMP

Load Regulation

(Note 10)

Source ≤ 90 μA, (VDD − V

TEMP

) ≥ 200 mV

−0.1 −1 mV (max)

Sink ≤ 100 μA, V

TEMP

≥ 260 mV

0.1 1 mV (max)

Source or Sink = 100 μA

1 Ohm

VDD Supply- to-V

TEMP

DC Line Regulation (Note 13)

VDD = +1.6V to +5.5V

0.29 mV

μV/V

−82 dB

TEMP

Output Load

Capacitance

Without series resistor. See Section 4.2 1100

pF (max)

TRIP TEST DIGITAL INPUT

Logic "1" Threshold Voltage

VDD− 0.5

V (min)

Logic "0" Threshold Voltage

0.5 V (max)

Logic "1" Input Current

1.5 2.5

μA (max)

Logic "0" Input Current (Note 12)

0.001 1

μA (max)

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LM26LV

Symbol Parameter Conditions Typical

(Note 6)

Limits

(Note 7)

Units

(Limit)

TIMING

Time from Power On to Digital Output Enabled. See definition below. (Note 11).

1.1 10 ms (max)

TEMP

Time from Power On to Analog Temperature Valid. See definition below. (Note 11)

0.9 10 ms (max)

Definitions of tEN and t

TEMP

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Notes

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 > VDD), the current at that pin should be limited to 5 mA.

Note 3: The Human Body Model (HBM) is a 100 pF capacitor charged to the specified voltage then discharged through a 1.5 kΩ resistor into each pin. The

Machine Model (MM) is a 200 pF capacitor charged to the specified voltage then discharged directly into each pin. The Charged Device Model (CDM) is a specified circuit characterizing an ESD event that occurs when a device acquires charge through some triboelectric (frictional) or electrostatic induction processes and then abruptly touches a grounded object or surface.

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

Note 5: The junction to ambient temperature 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 Conversion 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 temperature resistance.

Note 10: Source currents are flowing out of the LM26LV. Sink currents are flowing into the LM26LV.

Note 11: Guaranteed by design.

Note 12: The 1 µA limit is based on a testing limitation and does not reflect the actual performance of the part. Expect to see a doubling of the current for every

15°C increase in temperature. For example, the 1 nA typical current at 25°C would increase to 16 nA at 85°C.

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 4.3.

Note 14: The curves shown represent typical performance under worst-case conditions. Performance improves with larger overhead (VDD − V

TEMP

), larger VDD,

and lower temperatures.

Note 15: The curves shown represent typical performance under worst-case conditions. Performance improves with larger V

TEMP

, larger VDD and lower

temperatures.

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LM26LV

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