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Texas Instruments LM57TQPWQ1
- Part No.:
- LM57TQPWQ1
- Manufacturer:
- Texas Instruments
- Category:
- Thermostats - Solid State
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM57TQPWQ1.pdf
- Description:
- THERMOSTAT PROG ACT HI/LO 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,071
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Product details
Overview
LM57TQPWQ1 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 delivers ±2.3°C trip accuracy and ±1.3°C analog sensor accuracy across −50°C to +125°C, with 10°C hysteresis, for engine bay thermal monitoring and battery pack overtemperature protection.
For engineers reviewing the LM57TQPWQ1 datasheet, LM57TQPWQ1 pinout, LM57TQPWQ1 application, or LM57TQPWQ1 equivalent, key selection considerations include its resistor-settable trip point (256 values), programmable NTC-slope VTEMP gain (J2–J5), TRIP-TEST in-system verification capability, and automotive-grade reliability under extended thermal stress.
Technical Context
The LM57TQPWQ1 integrates an internal DAC, analog temperature sensor, and comparator to generate precise trip decisions based on external RSENSE1/RSENSE2 resistor ratios. Its VTEMP output exhibits four programmable negative temperature coefficients (−5.166, −7.752, −10.339, or −12.924 mV/°C), each mapped to specific trip-point ranges.
Built-in 10°C hysteresis prevents output oscillation during thermal transitions. The TRIP-TEST pin enables functional verification by forcing both digital outputs active and routing VTRIP to VTEMP, allowing microcontroller-based validation of comparator and output circuitry post-assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | −50°C to +125°C - supports under-hood automotive applications with full specification compliance. |
| Supply Voltage | +2.4 V to +5.5 V - compatible with 3.3 V and 5 V automotive power rails without level-shifting. |
| Tript Point Accuracy | ±2.3°C - includes contribution from 1% external resistors; no additional error from resistor tolerance. |
| VTEMP Accuracy | ±1.3°C - enables high-fidelity thermal telemetry for closed-loop control or diagnostics. |
| Hysteresis | 10°C - factory-set; prevents chatter during slow thermal transients near TTRIP. |
| Quiescent Current | 24–29 µA - minimizes self-heating (<0.02°C) and extends battery life in always-on systems. |
| Startup Time | 1.5 ms - ensures rapid readiness after power-up for safety-critical thermal response. |
Pinout & Package
Packaged in PW/TSSOP-8 (3.00 mm × 6.40 mm), the LM57TQPWQ1 uses a standard surface-mount footprint compatible with automated assembly and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Power ground reference | Common return path for analog and digital sections; must be low-impedance for noise immunity. |
| SENSE1 / SENSE2 | Resistor divider inputs | Determine TTRIP and VTEMP gain via ratio; tolerate 1% resistor tolerance without accuracy penalty. |
| VDD | Positive supply input | Accepts 2.4–5.5 V; powers internal bandgap, DAC, comparator, and output drivers. |
| TRIP TEST | Digital test enable input | Active-high; asserts outputs and routes VTRIP to VTEMP for in-system functional verification. |
| TOVER | Active-high overtemp output | Push-pull structure drives high without external pull-up; directly interfaces with MCU GPIO. |
| TOVER | Active-low overtemp output | Open-drain structure requires external pull-up; enables wired-OR fault-bus architectures. |
| VTEMP | Analog temperature voltage output | Class AB output with programmable NTC slope; connects directly to ADC input without buffering. |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmable trip point | 256 discrete thresholds set by two 1% external resistors - eliminates need for trimming or calibration. |
| Dual independent digital outputs | TOVER (push-pull) and TOVER (open-drain) - supports diverse MCU interface requirements and fault-bus topologies. |
| TRIP-TEST latching function | Asserting TRIP-TEST latches TOVER/TOVER state until cleared - enables persistent fault indication without continuous polling. |
| VTEMP with selectable NTC gain | Four slopes (J2–J5) matched to trip range - ensures optimal ADC resolution across full operating temperature span. |
| Short-circuit protected outputs | Both analog and digital outputs withstand sustained short-to-rail conditions - improves system robustness in harsh environments. |
Applications
| Engine Control Unit Thermal Monitoring | Battery Management System Overtemperature Protection |
|---|---|
Use Scenario: Real-time die temperature tracking of powertrain ECUs exposed to under-hood ambient up to 125°C. IC Role / Device Role / Timing Role: Precision analog VTEMP output feeds ECU ADC for thermal derating algorithms; TOVER triggers immediate shutdown if threshold exceeded. Use Value: ±1.3°C VTEMP accuracy enables accurate junction temperature estimation; 10°C hysteresis prevents false trips during transient heating. | Use Scenario: Monitoring lithium-ion battery pack cell temperature during fast charging and discharge cycles. IC Role / Device Role / Timing Role: LM57TQPWQ1 senses module-level temperature; TOVER signals BMS controller to disable charge path upon overtemperature event. Use Value: Resistor-programmable trip allows precise alignment with battery chemistry limits; TRIP-TEST enables production-line functional test without thermal chamber. |
| Automotive Lighting Module Thermal Shutdown | ADAS Radar Module Temperature Compensation |
Use Scenario: Protecting high-power LED driver ICs in headlamp assemblies from thermal runaway. IC Role / Device Role / Timing Role: LM57TQPWQ1 mounted near LED driver die provides localized overtemperature detection; TOVER forces PWM dimming reduction or cutoff. Use Value: Low 24 µA quiescent current avoids self-heating interference; push-pull TOVER drives logic-level signal directly into driver enable pin. | Use Scenario: Compensating RF front-end gain drift in 77 GHz radar modules due to ambient temperature variation. IC Role / Device Role / Timing Role: VTEMP analog output supplies real-time temperature data to radar SoC for adaptive calibration lookup tables. Use Value: Class AB output drives 1100 pF capacitive load directly into ADC sample-and-hold; ±1.3°C accuracy ensures stable RF performance across −40°C to +125°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 |
|---|---|---|---|
| LM57FQPWQ1 | 5°C hysteresis (vs. 10°C); same package, grade, and accuracy specs | Better suited for applications requiring tighter thermal window control before trip assertion | Select when thermal transients are rapid and minimal hysteresis is needed to avoid delayed response |
| LM57TSPWQ1 | Grade 0 Extended (−50°C to +160°C operating range); same 10°C hysteresis | Required for under-hood locations exceeding +125°C, e.g., turbocharger proximity sensing | Choose only when ambient operating temperature exceeds +125°C; otherwise LM57TQPWQ1 is optimal for Grade 1 cost/performance balance |
Compared with LM57FQPWQ1 and LM57TSPWQ1, the LM57TQPWQ1 offers the optimal combination of 10°C hysteresis for stable switching, AEC-Q100 Grade 1 qualification for mainstream automotive use, and cost-effective TSSOP-8 packaging - making it the preferred choice for ECU, BMS, and lighting thermal management where +125°C max ambient is sufficient.
Availability
LM57TQPWQ1 is available at Aetrix Electronics and suitable for automotive engine control units, battery management systems, and ADAS radar modules requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.
Supply support for LM57TQPWQ1 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 monitoring ICs with dual digital outputs and precision analog sensing - engineered specifically for automotive thermal safety, diagnostics, and compensation functions.
FAQ
What is the maximum operating temperature range specified for the LM57TQPWQ1?
The LM57TQPWQ1 is rated for operation from −50°C to +125°C per AEC-Q100 Grade 1 specifications. This range is fully characterized for all electrical parameters including trip accuracy (±2.3°C), VTEMP accuracy (±1.3°C), and hysteresis (10°C). Operation beyond +125°C is not guaranteed and requires evaluation of the LM57TSPWQ1 variant.
How does the LM57TQPWQ1 achieve ±2.3°C trip point accuracy despite using external 1% resistors?
The LM57TQPWQ1 achieves ±2.3°C trip accuracy because its internal architecture decodes resistor ratios into 16 discrete logic levels that drive a DAC - resistor tolerance contributes zero error to threshold setting. The ±2.3°C spec includes all sources: DAC linearity, comparator offset, and sensor nonlinearity - verified across −50°C to +125°C.
Can the LM57TQPWQ1's VTEMP output drive an ADC input directly without buffering?
Yes, the LM57TQPWQ1's VTEMP output is a class AB driver capable of sourcing/sinking up to 300 µA and tolerating 1100 pF capacitive load - sufficient to drive most SAR and delta-sigma ADC inputs directly. Load regulation remains within ±1 mV for sink currents ≤300 µA, eliminating need for op-amp buffering in typical implementations.
What is the purpose of the TRIP-TEST pin on the LM57TQPWQ1, and how is it used in production testing?
The TRIP-TEST pin on the LM57TQPWQ1 enables in-system functional verification: driving it high asserts both TOVER and TOVER outputs and routes the trip-reference voltage VTRIP to VTEMP. This allows a microcontroller to confirm comparator decision logic and output driver functionality without thermal cycling - a critical capability for end-of-line test in automotive manufacturing.
Does the LM57TQPWQ1 require external pull-up resistors on its digital outputs?
Only TOVER (active-low, open-drain) requires an external pull-up resistor; TOVER (active-high, push-pull) does not. TI recommends a 4.7 kΩ pull-up to VDD for TOVER to ensure clean logic transitions and noise immunity. No pull-up is needed for TOVER - it actively drives high to VDD – 0.2 V at 600 µA source current.
LM57TQPWQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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
LM57TQPWQ1 FAQ
1.How can I place an order for LM57TQPWQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM57TQPWQ1 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 LM57TQPWQ1 reliable?
The price and inventory of LM57TQPWQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM57TQPWQ1 is usually 5 days.
3.What payment methods are accepted for LM57TQPWQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM57TQPWQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM57TQPWQ1?
LM57TQPWQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM57TQPWQ1 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 LM57TQPWQ1?
For technical support, including LM57TQPWQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM57TQPWQ1 requirements.
6.How does Aetrix verify that LM57TQPWQ1 is sourced from the original manufacturer or authorized distributors?
All LM57TQPWQ1 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 LM57TQPWQ1 meets industry standards.
7.What is the process for return or replacement of LM57TQPWQ1?
All LM57TQPWQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM57TQPWQ1, 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 LM57TQPWQ1 part is unused and in its original packaging.
Return procedure for LM57TQPWQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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