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 (TOS) 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 (VTEMP). 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 TOS and go HIGH when the temperature goes below (TOS–THYST). Similarly, when preprogrammed as an undertemperature shutdown (US) it will go HIGH to indicate that the temperature is below TUS and go LOW when the temperature is above (TUS+THYST). The typical hysteresis, THYST, can be set to 2°C or 10°C and is controlled by the state of the HYST pin. A VTEMP 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.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM26 | SOT-23 (5) | 2.90 mm × 1.60 mm |
Changes from R Revision (February 2013) to S Revision
Changes from Q Revision (September 2011) to R Revision
Order Number | Top Mark | Trip Point Setting | Output Function | |
---|---|---|---|---|
Bulk Rail (1000 Units) | Tape & Reel (3000 Units) | |||
LM26CIM5-BPB | LM26CIM5X-BPB | TBPB | -45°C | Active-Low, Open-Drain, US output |
LM26CIM5-DPB | LM26CIM5X-DPB | TDPB | -25°C | Active-Low, Open-Drain, US output |
LM26CIM5-HHD | LM26CIM5X-HHD | THHD | 0°C | Active-High, Push-Pull, US output |
LM26CIM5-NPA | LM26CIM5X-NPA | TNPA | 45°C | Active-Low, Open-Drain, OS output |
LM26CIM5-RPA | LM26CIM5X-RPA | TRPA | 65°C | Active-Low, Open-Drain, OS output |
LM26CIM5-SHA | LM26CIM5X-SHA | TSHA | 75°C | Active-Low, Open-Drain, OS output |
LM26CIM5-SPA | LM26CIM5X-SPA | TSPA | 70°C | Active-Low, Open-Drain, OS output |
LM26CIM5-TPA | LM26CIM5X-TPA | TTPA | 85°C | Active-Low, Open-Drain, OS output |
LM26CIM5-VHA | LM26CIM5X-VHA | TVHA | 90°C | Active-Low, Open-Drain, OS output |
LM26CIM5-VPA | LM26CIM5X-VPA | TVPA | 95°C | Active-Low, Open-Drain, OS output |
LM26CIM5-XHA | LM26CIM5X-XHA | TXHA | 100°C | Active-Low, Open-Drain, OS output |
LM26CIM5-XPA | LM26CIM5X-XPA | TXPA | 105°C | Active-Low, Open-Drain, OS output |
LM26CIM5-YHA | LM26CIM5X-YHA | TYHA | 110°C | Active-Low, Open-Drain, OS output |
LM26CIM5-YPA | LM26CIM5X-YPA | TYPA | 115°C | Active-Low, Open-Drain, OS output |
LM26CIM5-ZHA | LM26CIM5X-ZHA | TZHA | 120°C | Active-Low, Open-Drain, OS output |
PIN | TYPE | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | HYST | Input | Hysteresis control, digital input; connect to GND for 10°C or V+ for 2°C |
2 | GND | Power | Ground, connected to the back side of the die through lead frame; connect to system ground |
3 | VTEMP | Output | Analog output voltage proportional to temperature; leave floating or connect to a high impedance node. |
4 | V+ | Power | Supply input; connect to 2.7 V to 5.5 V with a 0.1-μF bypass capacitor. |
5(1) | OS | Output | Overtemperature Shutdown open-drain active low thermostat digital output; connect to controller interrupt, system/power supply shutdown; pullup resistor ≥ 10 kΩ |
OS | Output | Overtemperature Shutdown push-pull active high thermostat digital output; connect to controller interrupt, system/power supply shutdown | |
US | Output | Undertemperature Shutdown open-drain active low thermostat digital output; connect to controller interrupt, system/power supply shutdown; pullup resistor ≥ 10 kΩ | |
US | Output | Undertemperature Shutdown push-pull active high thermostat digital output; connect to controller interrupt, system/power supply shutdown |
MIN | MAX | UNIT | |||
---|---|---|---|---|---|
Input Voltage | 6 | V | |||
Input Current at any pin (2) | 5 | mA | |||
Package Input Current (2) | 20 | mA | |||
Package Dissipation at TA = 25°C(3) | 500 | mW | |||
Soldering Information(4) | SOT-23 Package | Vapor Phase (60 seconds) | 215 | °C | |
Infrared (15 seconds) | 220 | ||||
Storage Temperature, Tstg | −65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge(1) | Human body model (HBM) | ±2500 | V |
Machine Model | ±250 |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Specified Temperature Range (TMIN ≤ TA ≤ TMAX) | −55 | 125 | °C | |
Positive Supply Voltage (V+) | 2.7 | 5.5 | V | |
Maximum VOUT | 5.5 | V |
THERMAL METRIC(1) | LM26 | UNIT | |
---|---|---|---|
DBV (SOT-23) | |||
5 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 250 | °C/W |
PARAMETER | TEST CONDITIONS | MIN(2) | TYP(1) | MAX(2) | UNIT | ||
---|---|---|---|---|---|---|---|
TEMPERATURE SENSOR | |||||||
Trip Point Accuracy (Includes VREF, DAC, Comparator Offset, and Temperature Sensitivity errors) | –55°C ≤ TA ≤ +110°C | ±3 | °C | ||||
TA = +120°C | ±4 | °C | |||||
Trip Point Hysteresis | HYST = GND | 11 | °C | ||||
HYST = V+ | 2 | °C | |||||
VTEMP Output Temperature Sensitivity | −10.82 | mV/°C | |||||
VTEMP Temperature Sensitivity Error to Equation: VO = (−3.479 × 10−6 × (T − 30)2) + |
−30°C ≤ TA ≤ 120°C | ±3 | °C | ||||
−55°C ≤ TA ≤ 120°C, | 4.5 V ≤ V+ ≤ 5.5 V | ±3 | °C | ||||
TA = 30°C | ±2.5 | °C | |||||
VTEMP Load Regulation | Source ≤ 1 μA | 0.070 | mV | ||||
Sink ≤ 40 μA | 0.7 | mV | |||||
VTEMP Line Regulation | +2.7 V ≤ V+ ≤ +5.5 V, −30°C ≤ TA ≤ +120°C |
−0.2 | mV/V | ||||
IS | Supply Current | TA = 25°C | 16 | 20 | µA | ||
40 | |||||||
DIGITAL OUTPUT AND INPUT | |||||||
IOUT(1) | Logical 1 Output Leakage Current (4) | TA = 25°C | V+ = +5.0 V | 0.001 | 1 | µA | |
VOUT(0) | Logical 0 Output Voltage | IOUT = +1.2 mA and V+ ≥ 2.7 V; IOUT = +3.2 mA and V+ ≥ 4.5 V(3) | 0.4 | V | |||
VOUT(1) | Logical 1 Push-Pull Output Voltage | ISOURCE = 500 µA, V+ ≥ 2.7 V | 0.8 × V+ | V | |||
ISOURCE = 800 µA, V+≥ 4.5 V | V+ − 1.5 | V | |||||
VIH | HYST Input Logical 1 Threshold Voltage | 0.8 × V+ | V | ||||
VIL | HYST Input Logical 0 Threshold Voltage | 0.2 × V+ | V |