lm27-2plmda National Semiconductor Corporation, lm27-2plmda Datasheet

lm27-2plmda

Manufacturer Part Number

lm27-2plmda

Description

Accurate, 120 C-150 C Factory Preset Thermostat Lm27 Form

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM27-2PLMDA.pdf (10 pages)

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LM27A

±3°C Accurate, 120°C-150°C Factory Preset Thermostat

(LM27 in Die Form)

General Description

This datasheet applies to the LM27A, which is the die form of

the LM27. The LM27 is available in the SOT23-5 package.

Please refer to the LM27 datasheet for detailed specifications

pertaining to the packaged part.

The LM27A is a precision, single digital-output, low-power

thermostat comprised of an internal reference, DAC, temper-

ature sensor and comparator. Utilizing factory programming,

it can be manufactured with different trip points as well as

different digital output functionality. The trip point (T

be preset at the factory to any temperature in the range of

+120°C to +150°C in 1°C increments. The LM27A has two

digital output pads, one digital input (HYST) and one analog

output (V

output and the other is an active-low, open-drain output. Ei-

ther of the outputs (but not both) are available.

The LM27A is available in either an overtemperature shut-

down or an undertemperature shutdown option. An LM27A

with overtemperature shutdown is configured so that its ther-

mostat outputs (OS and OS) will go active when a rising

temperature crosses the trip point and the hysteresis will ap-

ply to a falling temperature. The thermostat outputs of an

LM27A with an undertemperature shutdown (US and US) will

trip on a falling temperature and hysteresis will apply on a

rising temperature. For example, when the LM27A is preset

as an overtemperature shutdown, the active-high output (OS)

will go HIGH and the active-low output (OS) will go LOW to

indicate that the die temperature is over the internally preset

temperature goes below (T

programmed as an undertemperature shutdown the active-

high output (US) will go HIGH and the active-low output

(US) will go LOW to indicate that the temperature is below

or 10°C and is controlled by the state of the HYST pin. The

temperature and has a −10.7mV/°C output slope.

TEMP

. The outputs will reset to their normal states when the

. The outputs will reset when the temperature is above

analog output provides a voltage that is proportional to

HYST

TEMP

). The typical hysteresis, T

). One digitial output is an active-high, push-pull

–T

HYST

). Similarly, when pre-

HYST

201530

, can be set to 2°C

) can

Standard parts are available, see ordering information for de-

tails. For other part options, contact a National Semiconductor

Distributor or Sales Representative for information on mini-

mum-order qualification.

Applications

■

Features

■

Key Specifications

■

Microprocessor Thermal Management

Appliances

Portable Battery Powered Systems

Fan Control

Industrial Process Control

HVAC Systems

Electronic System Protection

Internal comparator with pin selectable 2°C or 10°C

hysteresis

No external components required

Open-drain or push-pull digital output; supports CMOS

logic levels

Internal temperature sensor with V

Internal voltage reference and DAC for trip-point setting

Excellent power supply noise rejection

AEC-Q100 Qualified

Power Supply Voltage

Power Supply Current

Hysteresis Temperature

Temperature Trip Point Accuracy

TEMP

output allows after-assembly system testing

TEMP

2°C or 10°C(typ)

output pin

www.national.com

2.7V to 5.5V

±3°C (max)

40µA(max)

15µA(typ)

July 2007

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lm27-2plmda Summary of contents

Page 1

... Accurate, 120°C-150°C Factory Preset Thermostat (LM27 in Die Form) General Description This datasheet applies to the LM27A, which is the die form of the LM27. The LM27 is available in the SOT23-5 package. Please refer to the LM27 datasheet for detailed specifications pertaining to the packaged part. ...

Page 2

... For more detailed information on the suffix meaning see the part number template at the end of the Electrical Characteristics Section. Contact National Semiconductor for other set points and output options. Order Number NS Package Number LM27-2PL MDA Die form, no package Connection Diagram Bond Pad Mechanical Dimensions Dimensions of bond pad coordinates are in micrometers ...

Page 3

Pin Descriptions Pin Number Pin Name 1 HYST Hysteresis control, digital input 2 OS Overtemperature Shutdown push- (Note 8) pull active-high thermostat digital output US Undertemperature Shutdown push- pull active-high thermostat digital output 3 OS Overtemperature Shutdown open- (Note 8) ...

Page 4

... Absolute Maximum Ratings Input Voltage Input Current at any pin (Note 2) Package Input Current(Note 2) Storage Temperature ESD Susceptibility (Note 3) Human Body Model Machine Model LM27A Electrical Characteristics The following specifications apply for V limits apply for MIN Symbol Parameter Temperature Sensor ...

Page 5

... Part Number Template The series of digits labeled xyz in the part number LM27-xyz MDA, describe the set point value and the function of the output as follows: The place holders xy describe the set point temperature as shown in the following table. ...

Page 6

... TEMP NOISE CONSIDERATIONS The LM27A has excellent power supply noise rejection. Listed below is a variety of signals used to test the LM27A power supply rejection. False triggering of the output was not ob- served when these signals where coupled into the V+ pin of the LM27A. ...

Page 7

... Typical Applications Note: The fan's control pin has internal pull-up. The 10k pull-down sets a slow fan speed. When the output of the LM27A goes low, the fan will speed up. FIGURE 2. Two Speed Fan Speed Control FIGURE 3. Fan High Side Drive FIGURE 4. Fan Low Side Drive ...

Page 8

... Physical Dimensions for Die Product For Bond Pad Mechanical Dimensions, see Connection Diagram Section www.national.com FIGURE 5. Audio Power Amplifier Thermal Protection FIGURE 6. Simple Thermostat Order Number LM27-2PL MDA Bare Die TOP VIEW 1130µm × 902µm 8 20153022 20153023 20153002 ...

Page 9

9 www.national.com ...

Page 10

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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