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Texas Instruments LM57TQPWRQ1
- Part No.:
- LM57TQPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM57TQPWRQ1.pdf
- Description:
- THERMOSTAT PROG ACT HI/LO 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,113
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Product details
Overview
LM57TQPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified resistor-programmable temperature switch with dual digital outputs (TOVER active-high push-pull, TOVER active-low open-drain) and a class AB analog VTEMP output. It operates from −50°C to +125°C, provides ±2.3°C trip accuracy and ±1.3°C analog sensor accuracy, and uses two external 1% resistors to set trip point across 256 values-used in engine control units for overtemperature shutdown.
For engineers reviewing the LM57TQPWRQ1 datasheet, LM57TQPWRQ1 pinout, LM57TQPWRQ1 application, or LM57TQPWRQ1 equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, automotive-grade thermal hysteresis behavior, and confirmed alternative parts with documented functional differences.
Technical Context
The LM57TQPWRQ1 integrates an internal DAC, analog temperature sensor, and comparator to generate programmable trip thresholds via SENSE1/SENSE2 resistor networks. Its VTEMP output features four selectable negative temperature coefficient slopes (J2 to J5), each tied to a specific trip-point range and calibrated for linearity across −50°C to +125°C.
Digital outputs include built-in 10°C hysteresis (THYST), preventing oscillation during thermal transitions. TOVER asserts high on overtemperature; TOVER asserts low and requires an external pull-up. TRIP-TEST enables in-system functional verification by forcing both digital outputs active and routing VTRIP to VTEMP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | −50°C to +125°C - supports under-hood automotive applications without derating. |
| Supply Voltage | +2.4 V to +5.5 V - compatible with 3.3 V and 5 V microcontroller I/O domains. |
| Tript Point Accuracy | ±2.3°C - guaranteed over full temperature range using 1% external resistors; resistor tolerance contributes zero error to threshold. |
| VTEMP Accuracy | ±1.3°C - enables direct ADC reading of die temperature without calibration in most systems. |
| Hysteresis | 10°C - factory-set, prevents chatter during slow thermal transients in motor drivers or power converters. |
| Quiescent Current | 24–29 µA - minimizes self-heating (<0.02°C) and extends battery life in always-on modules. |
| VTEMP Gain Options | J2 (−5.166 mV/°C) to J5 (−12.924 mV/°C) - slope selected automatically by resistor network; ensures optimal ADC resolution per trip range. |
Pinout & Package
TSSOP-8 package (3.00 mm × 6.40 mm), thermally enhanced for PCB-mounted automotive sensors; JEDEC MS-012 compliant, 0.65 mm pitch, exposed pad optional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Power ground reference | Primary return path for analog and digital sections; must connect to low-impedance system ground plane. |
| SENSE1 / SENSE2 | Resistor divider input | Sets trip temperature and VTEMP gain; ratio determines one of 16 logic levels decoded by internal DAC. |
| VDD | Positive supply | Accepts 2.4–5.5 V; powers internal bandgap, DAC, comparator, and output drivers. |
| TRIP TEST | Digital test enable | Active-high input; when asserted, forces TOVER/TOVER active and outputs VTRIP on VTEMP for production test. |
| TOVER | Active-high overtemp signal | Push-pull output; drives MCU interrupt directly without pull-up; asserts above TTRIP, releases at TTRIP − 10°C. |
| TOVER | Active-low overtemp signal | Open-drain output; requires external pull-up; used for wired-OR fault bus or legacy interface compatibility. |
| VTEMP | Analog temperature voltage | Class AB output; linear NTC response; valid within 1.5 ms of power-up; sinks/sources ≤300 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmable trip point | 256 discrete thresholds from −50°C to +125°C; no firmware or EEPROM required for configuration. |
| Latching function | Tying TOVER to TRIP-TEST latches TOVER/TOVER after trip; cleared only by pulling TRIP-TEST low or power cycle. |
| In-system TRIP-TEST verification | Confirms comparator functionality and output driver integrity post-assembly without thermal chamber. |
| Short-circuit protected outputs | TOVER and TOVER survive sustained short to VDD or GND; VTEMP output withstands 1100 pF capacitive load. |
| Low self-heating | 24–29 µA quiescent current limits thermal offset to <0.02°C-critical for precision thermal monitoring. |
Applications
| Engine Control Module (ECM) | Electric Power Steering (EPS) |
|---|---|
Use Scenario: Real-time monitoring of IGBT junction temperature in high-side driver stage. IC Role / Device Role / Timing Role: Dual-output thermal protector: TOVER triggers immediate MCU shutdown; VTEMP feeds ADC for predictive thermal management. Use Value: 10°C hysteresis prevents false trips during transient load spikes; ±2.3°C trip accuracy ensures compliance with ISO 26262 ASIL-B thermal safety requirements. | Use Scenario: Overtemperature protection of motor driver MOSFETs during parking assist maneuvers. IC Role / Device Role / Timing Role: Analog sensor + digital alarm: VTEMP provides continuous feedback to torque control loop; TOVER initiates fail-safe torque reduction. Use Value: Resistor-programmability allows precise trip setting at 115°C-matching MOSFET SOA limits-without custom firmware. |
| Transmission Control Unit (TCU) | Onboard Charger (OBC) |
Use Scenario: Monitoring solenoid coil temperature during gear-shift actuation cycles. IC Role / Device Role / Timing Role: Temperature switch with latch: TOVER asserts on overtemp; latched state held until diagnostic clear command. Use Value: TRIP-TEST pin enables end-of-line functional test-verifying comparator and output stages without heating the unit. | Use Scenario: Die temperature monitoring of SiC half-bridge in 11 kW bidirectional OBC. IC Role / Device Role / Timing Role: Precision analog sensor: VTEMP feeds isolated sigma-delta ADC for closed-loop thermal derating. Use Value: ±1.3°C VTEMP accuracy eliminates need for system-level calibration; J5 gain (−12.924 mV/°C) maximizes ADC LSB utilization at 150°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature switch and analog sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM57FQPWRQ1 | 5°C hysteresis (vs. 10°C); same package, grade, and accuracy specs. | Better suited for fast-transient environments where tighter thermal window prevents nuisance trips. | Select when thermal ramp rates exceed 5°C/s and system cannot tolerate 10°C deadband. |
| LM57TEPWQ1 | Same 10°C hysteresis but Standard Grade 0 (−50°C to +150°C) vs. Grade 1 (−50°C to +125°C). | Required for under-hood applications exceeding 125°C ambient, e.g., turbocharger proximity mounting. | Choose when operating ambient exceeds 125°C but full Grade 0 Extended (170°C) capability is unnecessary. |
Compared with LM57FQPWRQ1 and LM57TEPWQ1, the LM57TQPWRQ1 uniquely balances 10°C hysteresis for robustness in noisy automotive environments with Grade 1 qualification-reducing cost versus Grade 0 while maintaining reliability at 125°C ambient.
Availability
LM57TQPWRQ1 is available at Aetrix Electronics and suitable for engine control modules, electric power steering systems, and transmission control units requiring stable component supply across automotive production lifecycles.
Supply support for LM57TQPWRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for automotive, industrial, and personal electronics markets.
The LM57-Q1 product line delivers AEC-Q100 qualified temperature sensing and protection ICs designed specifically for automotive subsystems requiring functional safety, long-term reliability, and resistor-based configurability without software overhead.
FAQ
What is the maximum operating temperature of the LM57TQPWRQ1?
The LM57TQPWRQ1 is qualified for Automotive Grade 1 operation, supporting a free-air temperature range of −50°C to +125°C. This rating is validated per AEC-Q100 with full reliability testing-including HTOL at 170°C for Grade 0 Extended variants-but LM57TQPWRQ1 itself is specified up to +125°C ambient. Exceeding this limit may impact trip accuracy and long-term reliability.
How does the LM57TQPWRQ1 achieve ±2.3°C trip accuracy with external resistors?
The LM57TQPWRQ1 achieves ±2.3°C trip accuracy because its internal DAC decodes resistor ratios into 16 discrete logic levels-each mapped to a precise trip voltage-making the threshold independent of absolute resistor tolerance. Only resistor ratio matching matters, so standard 1% resistors deliver full specified accuracy without trimming or calibration.
Can the LM57TQPWRQ1 be used without connecting the TRIP-TEST pin?
Yes, the LM57TQPWRQ1 operates fully without TRIP-TEST connection: tie TRIP-TEST to GND if unused. In normal operation (TRIP-TEST = 0), VTEMP outputs the analog temperature voltage and TOVER/TOVER respond to thermal events. Leaving TRIP-TEST floating is not recommended due to noise susceptibility; grounding ensures deterministic behavior.
What is the purpose of the two different digital outputs (TOVER and TOVER) on the LM57TQPWRQ1?
The LM57TQPWRQ1 provides TOVER (active-high push-pull) and TOVER (active-low open-drain) to support diverse system interface requirements. TOVER drives interrupts directly into 3.3 V or 5 V MCUs without external components. TOVER enables wired-OR fault buses, level-shifting, or compatibility with legacy open-drain monitoring circuits-giving designers flexibility in fault signaling architecture.
Does the LM57TQPWRQ1 require external capacitors on the VTEMP pin?
No, the LM57TQPWRQ1 does not require an external capacitor on the VTEMP pin. Its class AB output drives capacitive loads up to 1100 pF without instability. However, a small ceramic capacitor (e.g., 100 nF) may be added near the ADC input to reduce noise coupling-this is a system-level decision, not a device requirement.
LM57TQPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- Programmable
- Accuracy:
- ±2.3°C
- Current - Output (Max):
- 5mA
- Output Type:
- Open Drain, Push-Pull
- Output:
- Active High, Active Low
- Output Function:
- OverTemp, /OverTemp
- Selectable Hysteresis:
- No
- Features:
- Selectable Trip Point, Trip Test
- Voltage - Supply:
- 2.5 V ~ 5.5 V
- Current - Supply:
- 24µA
- Operating Temperature:
- -50°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- 8-TSSOP
LM57TQPWRQ1 FAQ
1.How can I place an order for LM57TQPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM57TQPWRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM57TQPWRQ1 reliable?
The price and inventory of LM57TQPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM57TQPWRQ1 is usually 5 days.
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LM57TQPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM57TQPWRQ1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM57TQPWRQ1?
For technical support, including LM57TQPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM57TQPWRQ1 requirements.
6.How does Aetrix verify that LM57TQPWRQ1 is sourced from the original manufacturer or authorized distributors?
All LM57TQPWRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM57TQPWRQ1 meets industry standards.
7.What is the process for return or replacement of LM57TQPWRQ1?
All LM57TQPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM57TQPWRQ1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM57TQPWRQ1 part is unused and in its original packaging.
Return procedure for LM57TQPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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