LM26_15 Datasheet, PDF (1/24 Pages) Texas Instruments – Accurate, Factory-Preset Thermostat

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LM26
SNIS115S – MAY 2001 – REVISED SEPTEMBER 2015
LM26 SOT-23, ±3°C Accurate, Factory-Preset Thermostat
1 Features
•1 Internal Comparator With Pin Programmable 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_TEMP Output
Pin
• V_TEMP Output Allows After-Assembly System
Testing
• Internal Voltage Reference and DAC for Trip-Point
Setting
• Currently Available in 5-pin SOT-23 Plastic
Package
• Excellent Power Supply Noise Rejection
• UL Recognized Component
• Key Specifications
– Power Supply Voltage 2.7 V to 5.5 V
– Power Supply Current
40 μA (Maximum) 16 μA (Typical)
– Hysteresis Temperature 2°C or 10°C (Typical)
2 Applications
• Microprocessor Thermal Management
• Appliances
• Portable Battery Powered Systems
• Fan Control
• Industrial Process Control
• HVAC Systems
• Remote Temperature Sensing
• Electronic System Protection
3 Description
The LM26 is a precision, single digital-output, low-
power thermostat comprised of an internal reference,
DAC, temperature 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 −55°C to
110°C in 1°C increments. The LM26 has one digital
output (OS/OS/US/US), one digital input (HYST) and
one analog output (V_TEMP). The digital output stage
can be preset as either open-drain or push-pull. In
addition, it can be factory programmed to be active
HIGH or LOW. The digital output can be factory
programmed to indicate an over temperature
shutdown event (OS or OS) or an under temperature
shutdown event (US or US). When preset as an
overtemperature shutdown (OS) it will go LOW to
indicate that the die temperature is over the internally
preset T_OS and go HIGH when the temperature goes
below (T_OS–T_HYST). Similarly, when preprogrammed
as an undertemperature shutdown (US) it will go
HIGH to indicate that the temperature is below T_US
and go LOW 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. A V_TEMP analog output provides a voltage
that is proportional to temperature and has a −10.82
mV/°C output slope.
Available parts are detailed in the Device Comparison
Table. For other part options, contact a Texas
Instruments Distributor or Sales Representative for
information on minimum order qualification. The
LM26 is currently available in a 5-lead SOT-23
package.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM26
SOT-23 (5)
2.90 mm × 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
LM26CIM5-TPA Simplified Block Diagram and Connection Diagram
HYST
GND
VTEMP
REF
TEMP
SENSOR
HYST
+
-
LM26TPA
TOS
OS
TOS - THYST
OS
V+ = 2.7V
to 5.5V
Temp. of
Leads
HYST=GND for 10°C Hysteresis
HYST = V+ for 2°C Hysteresis
VTEMP = (-3.479 x 10^-6 x (T-30)²) + (-1.082 x 10^-2 x (T-30)) + 1.8015V
The LM26CIM5-TPA has a fixed trip point of 85°C. For other trip point and output function availability, please see the
Device Comparison Table or contact Texas Instruments.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.