Datasheet > LM27-2PLMDA

LM27-2PLMDA

更新时间： 2024-10-28 04:20:11

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
10页	237K
描述
【3∑C Accurate, 120∑C-150∑C Factory Preset Thermostat (LM27 in Die Form)

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LM27-2PLMDA 数据手册

July 2007

LM27A

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

(LM27 in Die Form)

Standard parts are available, see ordering information for de-

tails. For other part options, contact a National Semiconductor

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.

Distributor or Sales Representative for information on mini-

mum-order qualification.

Applications

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_OS) can

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

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

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

Microprocessor Thermal Management

■

Appliances

Portable Battery Powered Systems

Fan Control

Industrial Process Control

HVAC Systems

Electronic System Protection

Features

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

T_OS. The outputs will reset to their normal states when the

temperature goes below (T_OS–T_HYST). Similarly, when pre-

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

T_US. The outputs will reset when the temperature is above

(T_US+T_HYST). The typical hysteresis, T_HYST, can be set to 2°C

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

V_TEMPanalog output provides a voltage that is proportional to

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

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_TEMPoutput pin

■

V_TEMPoutput allows after-assembly system testing

Internal voltage reference and DAC for trip-point setting

Excellent power supply noise rejection

AEC-Q100 Qualified

■

Key Specifications

■ꢀPower Supply Voltage

■ꢀPower Supply Current

2.7V to 5.5V

40µA(max)

15µA(typ)

■ꢀHysteresis Temperature

■ꢀTemperature Trip Point Accuracy

2°C or 10°C(typ)

±3°C (max)

201530

www.national.com

12 3 4 5 6 7...10

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