LM27 datasheet(4/17 Pages) TI1

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LM27

SNIS124D – AUGUST 2002 – REVISED JULY 2013

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LM27 Electrical Characteristics

The following specifications apply for V

+ = 2.7V

DC to 5.5VDC, and VTEMP load current = 0µA unless otherwise specified.

Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C unless otherwise specified.

Parameter

LM27CIM

Units

Symbol

Conditions

Typical(1)

Limits(2)

(Limits)

Temperature Sensor

Trip Point Accuracy (Includes VREF, DAC,

+120°C<TA<+150°C

±3

°C (max)

Comparator Offset, and Temperature

Sensitivity errors)

Trip Point Hysteresis

HYST = GND

°C

HYST = V+

°C

VTEMP Output Temperature Sensitivity

−10.82

mV/°C

VTEMP Temperature Sensitivity Error to

−30°C ≤ TA ≤ 150°C, 2.7V ≤

±3

°C (max)

Equation:

V+

≤ 5.5V

VO = (−3.552×10

−6×(T−30)2+

−55°C ≤ TA ≤ 150°C, 4.5V ≤

±3

°C (max)

V+

≤ 5.5V

(

−10.695×10

−3×(T−30))+ 1.8386V (1)

TA = 25°C

±2.5

°C (max)

VTEMP Load Regulation

Source

≤ 1 μA

0.070

Sink

≤ 40 μA

0.7

mV (max)

VTEMP Line Regulation

+2.7V

≤ V+ ≤ +5.5V,

−0.2

mV/V

−30°C ≤ TA ≤ +120°C

Supply Current

µA (max)

Digital Output and Input

IOUT(“1”)

Logical “1” Output Leakage Current(3)

V+ = +5.0V

0.001

µA (max)

VOUT(“0”)

Logical “0” Output Voltage

IOUT = +1.2mA and

0.4

V (max)

V+

≥2.7V; IOUT = +3.2mA

and V+

≥4.5V(4)

VOUT(“1”)

Logical “1” Push-Pull Output Voltage

ISOURCE = 500µA, V

+ ≥ 2.7V

0.8 × V+

V (min)

ISOURCE = 800µA, V

+≥4.5V

V+

− 1.5

V (min)

VIH

HYST Input Logical ”1“ Threshold Voltage

0.8 × V+

V (min)

VIL

HYST Input Logical ”0“ Threshold Voltage

0.2 × V+

V (max)

(1)

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

(2)

Limits are ensured to AOQL (Average Outgoing Quality Level).

(3)

The 1µA 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 1nA typical current at 25°C would increase to 16nA at 85°C.

(4)

Care should be taken to include the effects of self heating when setting the maximum output load current. The power dissipation of the

LM27 would increase by 1.28mW when IOUT=3.2mA and VOUT=0.4V. With a thermal resistance of 250°C/W, this power dissipation

would cause an increase in the die temperature of about 0.32°C due to self heating. Self heating is not included in the trip point

accuracy specification.

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