UNITRODE UC1730, UC2730, UC3730 Technical data

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UNITRODE UC1730, UC2730, UC3730 Technical data

UC1730

Thermal Monitor

FEATURES

On-Chip Temperature Transducer

Temperature Comparator Gives Threshold Temperature Alarm

Power Reference Permits Airflow Diagnostics

Precision 2.5V Power Reference Permits Airflow Diagnostics

Transducer Output is Easily Scaled for Increased Sensitivity

Low 2.5mA Quiescent Current

BLOCK DIAGRAM

UC1730

UC2730

UC3730

DESCRIPTION

The UC1730 family of integrated circuit devices are designed to be used in a number of thermal monitoring applications. Each IC combines a temperature transducer, precision reference, and temperature comparator allowing the device to respond with a logic output if temperatures exceed a user programmed level. The reference on these devices is capable of supplying in excess of 250mA of output current by setting a level of power dissipation the rise in die temperature will vary with airflow past the package, allowing the IC to respond to airflow conditions

These devices come in an 8-Pin DIP, plastic or ceramic, a 5-Pin TO-220 or a PLCC-20 version. In the 8-Pin version, a PTAT (proportional to absolute temperature) output reports die temperature directly. This output is configured such that its output level can be easily scaled up with two external gain resistors. A second PTAT source is internally referenced to the temperature comparator. The other input to this comparator can then be externally programmed to set a temperature threshold. When this temperature threshold is exceeded an alarm delay output is activated. Following the activation of the delay output, a separate open collector output is turned on. The delay pin can be programmed with an external RC to provide a time separation between activation of the delay pin and the alarm pin, permitting shutdown diagnostics in applications where the open collector outputs of multiple parts are wire OR’ed together.

The 5-Pin version in the TO-220 package is well suited for monitoring heatsink temperatures. Enhanced airflow sensitivities can be obtained with this package by mounting the device to a small heatsink in the airstream. This version of the device does not include the PTAT output or the open collector alarm output.

Pin numbers shown for 8-Pin DIP, ( ) number for 5-Pin TO-220.

10/94

ABSOLUTE MAXIMUM RATINGS

Input Supply Voltage, (+VIN). . . . . . . . . . . . . . . . . . . . . . . 40V Alarm Output Voltage (8-Pin Version Only) . . . . . . . . . . . 40V Alarm Delay Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10V Alarm Threshold Set Voltage . . . . . . . . . . . . . . . . . . . . . . 10V 2.5V Reference Output Current . . . . . . . . . . . . . . . . . -400 mA Alarm Output Current (8-Pin Version Only) . . . . . . . . . . 0 mA Power Dissipation at TA = 25°C (Note 2) . . . . . . . . . 1000 mW Power Dissipation at TC = 25°C (Note 2) . . . . . . . . . 2000 mW Thermal Resistance Junction to Ambient

N, 8-Pin Plastic DIP . . . . . . . . . . . . . . . . . . . . . . . . . 110°C/W J, 8-Pin Ceramic DIP . . . . . . . . . . . . . . . . . . . . . . . . 110°C/W

UC1730

UC2730

UC3730

T, 5-Pin Plastic DIP TO-220 . . . . . . . . . . . . . . . . . . . . 65°C/W Thermal Resistance Junction to Case

N, 8-Pin Plastic DIP. . . . . . . . . . . . . . . . . . . . . . . . . . . 60°C/W J, 8-Pin Ceramic DIP. . . . . . . . . . . . . . . . . . . . . . . . . . 40°C/W T, 5-Pin Plastic TO-220 . . . . . . . . . . . . . . . . . . . . . . . . . 5°C/W Operating Junction Temperature . . . . . . . . . -55°C to +150°C Storage Temperature . . . . . . . . . . . . . . . . . . -65°C to +150°C Lead Temperature (Soldering, 10 Seconds). . . . . . . . . 300°C

Note 1: Voltages are referenced to ground. Currents are positive into, negative out of, the specified terminals.

Note 2: Consult Packaging section of Databook for thermal limitations and considerations of package.

CONNECTION DIAGRAMS

DIL-8 (TOP VIEW)

N or J Package

5-PIN TO-220 (TOP VIEW)

T Package

PLCC-20 (TOP VIEW) Q Package

PACKAGE PIN FUNCTION

FUNCTION

PIN

N/C

1-3

ALARM DELAY

4

ALARM OUTPUT

5

+VIN

6

GND

7

N/C

8-13

PTAT+

14

PTAT-

15

2.5V REFERENCE

16

2.5V REFERENCE

17

ALARM

18

THRESHOLD SET

 

N/C

19-20

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TJ = 0°C to +100°C for the UC3730, -25°C to + 100°C for the UC2730 and -55°C to +125°C for the UC1730,

+VIN = + 5V, and PTAT– = 0V. TA = TJ.

PARAMETERS

TEST CONDITIONS

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

INPUT SUPPLY

 

 

 

 

 

Supply Current

+VIN = 35V

 

2.8

4.0

mA

 

+VIN = 5V

 

2.3

3.5

mA

REFERENCE

 

 

 

 

 

Output Voltage

TJ = 25°C

2.475

2.5

2.525

V

 

Over Temperature

2.46

 

2.54

V

Load Regulation

IOUT = 0 to 250mA

 

8.0

25

mV

Line Regulation

+VIN = 5 to 25V

 

1.0

5.0

mV

TEMPERATURE COMPARATOR

 

 

 

 

 

Temperature Comparator Threshold

at 300°K (26.85°C), Nominally 5mV/°K,

1.475

1.50

1.525

V

 

VINPUT High to Low

 

 

 

 

Temperature Error

 

-10

 

10

°C

Threshold Line Regulation

+VIN = 5 to 25V

 

0.005

0.02

%/V

Temperature Linearity

Note 2

 

2.0

5.0

°C

Threshold Hysteresis

 

3.0

8.0

15

mV

Input Bias Current

VINPUT at 1.5V

-0.5

-0.1

 

μA

Max Output Current

VOUT = 1V

1.2

3.0

 

mA

Output Sat Voltage

IOUT = 100μA

 

0.05

0.25

V

2

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