SNIS152E May   2009  – July 2015 LM57

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics - Accuracy Characteristics - Trip Point Accuracy
    6. 7.6 Electrical Characteristics - Accuracy Characteristics - VTEMP Analog Temperature Sensor Output Accuracy
    7. 7.7 Electrical Characteristics
    8. 7.8 Switching Characteristics
    9. 7.9 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 LM57 VTEMP Temperature-to-Voltage Transfer Function
        1. 8.3.1.1 LM57 VTEMP Voltage-to-Temperature Equations
      2. 8.3.2 RSENSE
      3. 8.3.3 Resistor Selection
      4. 8.3.4 TOVER and TOVER Digital Outputs
        1. 8.3.4.1 TOVER and TOVER Noise Immunity
      5. 8.3.5 Trip Test Digital Input
      6. 8.3.6 VTEMP Analog Temperature Sensor Output
        1. 8.3.6.1 VTEMP Noise Considerations
        2. 8.3.6.2 VTEMP Capacitive Loads
        3. 8.3.6.3 VTEMP Voltage Shift
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
      1. 9.1.1 ADC Input Considerations
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Selection of RSENSE Resistors
      3. 9.2.3 Application Curves
      4. 9.2.4 Grounding of the TRIP TEST Pin
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Temperature Considerations
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)(2)
MIN MAX UNIT
Supply voltage −0.3 6 V
Voltage at TOVER −0.3 6 V
Voltage at TOVER , VTEMP, TRIP-TEST, SENSE1, and SENSE2 −0.3 (VDD + 0.3 V) V
Current at any pin 5 mA
Storage temperature −65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Soldering process must comply with Reflow Temperature Profile specifications. Refer to www.ti.com/packaging.

7.2 ESD Ratings

VALUE UNIT
LM57BISD and LM57CISD in WSON package
V(ESD) Electrostatic discharge (1) Human body model (HBM) ±5500 V
Charged-device model (CDM) ±1250
Machine Model (MM) ±450
LM57FPW and LM57TPW in TSSOP package
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 (2) ±2000 V
Charged-device model (CDM), per JEDEC specification JESD22-C101 (3) ±750
(1) The Human Body Model (HBM) is a 100-pF capacitor charged to the specified voltage then discharged through a 1.5-kΩ resistor into each pin. The Machine Model (MM) is a 200 pF capacitor charged to the specified voltage then discharged directly into each pin. The Charged Device Model (CDM) is a specified circuit characterizing an ESD event that occurs when a device acquires charge through some triboelectric (frictional) or electrostatic induction processes and then abruptly touches a grounded object or surface.
(2) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(3) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

MIN NOM MAX UNIT
Supply voltage 2.4 5.5 V
Free air temperature range (TMIN ≤ TA ≤ TMAX) −50 150 °C

7.4 Thermal Information

THERMAL METRIC (1) LM57 UNIT
NGR (WSON/SD) PW (TSSOP)
8 PINS 8 PINS
RθJA Junction-to-ambient thermal resistance 71.3 183 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 82.8 66 °C/W
RθJB Junction-to-board thermal resistance 43.4 111 °C/W
ψJT Junction-to-top characterization parameter 2.2 8 °C/W
ψJB Junction-to-board characterization parameter 43.7 110 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 11.9 — °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

7.5 Electrical Characteristics - Accuracy Characteristics – Trip Point Accuracy

PARAMETER TEST CONDITIONS LM57B LM57C, LM57F or LM57T UNIT
MIN TYP MAX MIN TYP MAX
Trip Point Accuracy
(Includes 1% set-resistor tolerance) (1)		 J2 TA = −41°C to 52°C VDD = 2.4 V to 5.5 V ±1.5 ±2.3 °C
J3 TA = 52°C to 97°C VDD = 2.4 V to 5.5 V ±1.5 ±2.3 °C
J4 TA = 97°C to 119°C VDD = 2.4 V to 5.5 V ±1.5 ±2.3 °C
J5 TA = 119°C to free air temperature max VDD = 2.4 V to 5.5 V ±1.5 ±2.3 °C
(1) Accuracy is defined as the error between the measured and reference output voltages, tabulated in the Conversion Table at the specified conditions of supply gain setting, voltage, and temperature (expressed in °C). Accuracy limits include line regulation within the specified conditions. Accuracy limits do not include load regulation; they assume no DC load.

7.6 Electrical Characteristics - Accuracy Characteristics – VTEMP Analog Temperature Sensor Output Accuracy

These limits do not include DC load regulation. These stated accuracy limits are with reference to the values in Table 1.
PARAMETER TEST CONDITIONS LM57B LM57C, LM57F or LM57T UNIT
MIN TYP MAX MIN TYP MAX
VTEMP Accuracy
(These stated accuracy limits are with reference to the values in Table 1, LM57 VTEMP Temperature-to-Voltage.) (1)		 J2 TA = −50°C to free air temperature max VDD = 2.4 V to 5.5 V ±0.95 ±1.3 °C
J3 TA = −50°C to free air temperature max VDD = 2.4 V to 5.5 V ±0.8 ±1.3 °C
J4 TA = 20°C to 50°C VDD = 2.4 V to 5.5 V ±0.7 ±1.3 °C
TA = 0°C to free air temperature max VDD = 2.7 V to 5.5 V ±0.7 ±1.3
TA = −50°C to 0°C VDD = 3.1 V to 5.5 V ±0.8 ±1.3
J5 TA = 60°C to free air temperature max VDD = 2.4 V to 5.5 V ±0.7 ±1.3 °C
TA = 20°C to 50°C VDD = 2.9 V to 5.5 V ±0.7 ±1.3
TA = 0°C to free air temperature max VDD = 3.2 V to 5.5 V ±0.7 ±1.3
TA = −50°C to 0°C VDD = 4 V to 5.5 V ±0.8 ±1.3
(1) Accuracy is defined as the error between the measured and reference output voltages, tabulated in the Conversion Table at the specified conditions of supply gain setting, voltage, and temperature (expressed in °C). Accuracy limits include line regulation within the specified conditions. Accuracy limits do not include load regulation; they assume no DC load.

7.7 Electrical Characteristics

Unless otherwise noted, these specifications apply for VDD = 2.4 to 5.5 V. Limits apply over free air temperature range.
PARAMETER TEST CONDITIONS MIN (2) TYP (1) MAX (2) UNIT
TEMPERATURE SENSOR
VTEMP sensor gain J2: −50°C to 52°C −5.166 mV/°C
J3: 52°C to 97°C −7.752
J4: 97°C to 119°C −10.339
J5: 119°C to 150°C −12.924
Line regulation DC: supply-to-VTEMP(3) VDD = 2.4 V to 5.5 V
Temp = 90°C		 0.18 mV
58 μV/V
−84 dB
Load regulation: VTEMP output (6) Source ≤ 240 µA, (VDD – VTEMP) ≥ 200 mV; TA = −50°C to 150°C −1 mV
Sink ≤ 300 µA, VTEMP ≥ 360 mV; TA = −50°C to 150°C 1
Source or sink = 100 µA; TA = −50°C to 150°C 1 Ω
Maximum Load capacitance: VTEMP output No output series resistor required; (See VTEMP Capacitive Loads) 1100 pF
IS Supply current: quiescent (4) 24 28 µA
TRIP-TEST INPUT
VIH Logic 1 threshold voltage VDD – 0.5 V
VIL Logic 0 threshold voltage 0.5 V
IIH Logic 1 input current 1.4 3 µA
IIL Logic 0 input leakage current (5) TA = −50°C to 150°C 0.001 1 µA
TOVER (PUSH-PULL, ACTIVE-HIGH) OUTPUT
VOH Logic 1 push-pull output voltage Source ≤ 600 µA VDD – 0.2 V
Source ≤ 1.2 mA VDD – 0.45
VOL Logic 0 output voltage Sink ≤ 600 µA 0.2 V
Sink ≤ 1.2 mA 0.45
TOVER (OPEN-DRAIN, ACTIVE-LOW) OUTPUT
VOL Logic 0 output voltage Sink ≤ 600 µA 0.2 V
Sink ≤1.2 mA 0.45
IOH Logic 1 output leakage current (5) Temperature = 30°C; 0.001 1 µA
HYSTERESIS
THYST Hysteresis temperature 5°C hysteresis option (for all LM57F or LM57-5) 4.7 5 5.4 °C
10°C hysteresis option (for all LM57T or LM57-10) 9.6 10 10.6 °C
(1) Typicals are at TJ = TA = 25°C and represent most likely parametric norm.
(2) Limits are specified to TI's average outgoing quality level (AOQL).
(3) Line regulation (DC) is calculated by subtracting the output voltage at the highest supply voltage from the output voltage at the lowest supply voltage. The typical DC line regulation specification does not include the output voltage shift discussed in VTEMP Voltage Shift.
(4) Supply current refers to the quiescent current of the LM57 only and does not include any load current
(5) This current is leakage current only and is therefore highest at high temperatures. Prototype test indicate that the leakage is well below 1 μA over the full temperature range. This 1 μA specification reflects the limitations of measuring leakage at room temperature. For this reason only, the leakage current is not specified at a lower value.
(6) Source currents are flowing out of the LM57. Sink currents are flowing into the LM57. Load Regulation is calculated by measuring VTEMP at 0 μA and subtracting the value with the conditions specified.

7.8 Switching Characteristics

Unless otherwise noted, these specifications apply for VDD = 2.4 to 5.5 V over the free air temperature range.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
tEN Maximum time from power on to digital output enabled 1.5 2.9 ms
tVTEMP Maximum time from power on to analog temperature (VTEMP) valid 1.5 2.9 ms
LM57 30080550.gifFigure 1. Definition of tEN
LM57 30080551.gifFigure 2. Definition of tVTEMP

7.9 Typical Characteristics

LM57 30080569.gif
Figure 3. Supply Current vs Supply Voltage
LM57 30080567.gif
Figure 5. Load Regulation: Change In VTEMP vs Source Current Overhead Is Vdd-Vtemp
LM57 30080572.gif
Figure 7. Line Regulation: VTEMP vs Supply Voltage
LM57 30080525.gif
Figure 9. Start-Up Response
LM57 C102_SNIS152.png
Conditions: J2, VDD=5V
Figure 11. J2 Accuracy Specification Over Temperature
LM57 30080570.gif
Figure 4. Supply Current vs Temperature
LM57 30080568.gif
Figure 6. Load Regulation: Change In VTEMP vs Sink Current
LM57 30080526.gif
Figure 8. Line Regulation: Hysteresis vs Supply Voltage 30°C
LM57 30080527.gif
Figure 10. Hysteresis vs Temperature