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Texas Instruments LM2937ES-15/NOPB
- Part No.:
- LM2937ES-15/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
LM2937ES-15/NOPB.pdf
- Description:
- IC REG LIN 15V 500MA DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,083
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Product details
Overview
LM2937ES-15/NOPB from Texas Instruments is a 15-V, 500-mA positive low-dropout linear regulator using a PNP pass transistor, featuring 0.5-V typical dropout at full load, ±5% output voltage tolerance over all operating conditions, and integrated reverse-battery, 60-V transient, short-circuit, and thermal overload protection. It is designed for automotive power rails requiring stable 15-V supply under harsh electrical environments.
For engineers reviewing the LM2937ES-15/NOPB datasheet, LM2937ES-15/NOPB pinout, LM2937ES-15/NOPB application, or LM2937ES-15/NOPB equivalent, key selection criteria include dropout voltage at 500 mA, ESR-stable operation up to 3 Ω, quiescent current behavior under high VIN–VOUT differential, reverse-input protection capability, and TO-263 thermal performance in industrial and automotive PCB layouts.
Technical Context
The LM2937ES-15/NOPB employs a PNP-based LDO architecture with bandgap reference and internal current limiting, enabling regulation down to 0.5-V input-to-output differential. Its compensation network allows unconditional stability with output capacitors having ESR from 10 mΩ to 3 Ω-supporting ceramic, tantalum, and aluminum electrolytic types without external components.
Protection circuitry includes overvoltage shutdown (triggered at ~32 V), thermal shutdown (junction-limited to 125°C), and foldback current limiting (0.6–1 A short-circuit current). The device lacks enable or UVLO functions and enters regulation when VIN exceeds VOUT + 1 V, with optimal dynamic response achieved at VIN ≥ VOUT + 2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 15 V nominal, ±5% tolerance (14.25–15.75 V) across full temperature and load range-ensures compatibility with 15-V analog sensors and legacy industrial logic. |
| Max Output Current | 500 mA continuous-supports mid-power analog subsystems such as op-amp biasing, ADC references, and solenoid drivers without external boost stages. |
| Dropout Voltage | 0.5 V typical at 500 mA (1 V max over −40°C to 125°C)-enables operation from 16-V minimum input in automotive cold-crank scenarios. |
| Quiescent Current | 10 mA typical at full 500-mA load and VIN ≥ VOUT + 3 V-minimizes standby power loss in always-on vehicle modules. |
| Input Voltage Range | 16 V to 26 V operational (60-V transient survivability)-withstands load-dump transients per ISO 7637-2 Pulse 5a without external clamping. |
| Output Capacitor ESR | Stable with 10 mΩ to 3 Ω-permits use of low-cost bulk aluminum electrolytics alongside ceramics, reducing BOM count and layout sensitivity. |
| Thermal Protection | Thermal shutdown at 125°C junction, with RθJA = 41.8°C/W (DDPAK/TO-263 on 1-in² copper)-enables convection-cooled designs up to ~2.5 W dissipation at 70°C ambient. |
Pinout & Package
LM2937ES-15/NOPB is housed in a DDPAK/TO-263 (KTT) surface-mount package with exposed thermal tab. The 3-pin configuration integrates GND internally to the tab, which must be soldered to a large PCB copper area for thermal management and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT (Pin 1) | Unregulated DC input | Accepts 16–26 V DC; withstands −50 V reverse transients and 60 V load-dump spikes-requires local 0.1-μF ceramic decoupling. |
| GND (Pin 2) | Reference and return path | Common ground for control circuitry and output feedback; electrically tied to thermal tab (Pin 4). |
| OUTPUT (Pin 3) | Regulated 15-V output | Delivers up to 500 mA; requires ≥10-μF output capacitor with ESR ≤3 Ω placed adjacent to pin for stability. |
| TAB (Pin 4) | Thermal and ground terminal | Internally connected to Pin 2 (GND); must be soldered to ≥1-in² copper pour for thermal relief-no floating or isolated connection permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Withstands −30 V DC reverse input without damage-eliminates need for external series diode in battery-connected systems. |
| Mirror-image insertion protection | Prevents catastrophic failure if mounted backward-critical for automated assembly and field-replaceable modules. |
| Wide ESR stability range | Operates stably with output capacitor ESR from 10 mΩ to 3 Ω-supports cost-optimized capacitor selection without stability trade-offs. |
| 60-V transient immunity | Survives ISO 7637-2 Pulse 5a load-dump events up to 60 V/100 ms-reduces or eliminates TVS diode requirements in automotive ECUs. |
| Integrated thermal shutdown | Shuts down at 125°C junction and auto-recovers upon cooling-prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Analog I/O Module |
|---|---|
Use Scenario: Powers 15-V analog front-end circuitry-including precision op-amps, voltage references, and sensor signal conditioners-in engine control units exposed to wide temperature swings and load-dump transients. IC Role / Device Role / Timing Role: Primary 15-V LDO supplying critical analog rails; provides clean, regulated bias independent of battery voltage sag or surge. Use Value: Eliminates need for external transient suppressors and reverse-polarity diodes-reducing component count by two devices while maintaining ASIL-B compliance for sensor power integrity. | Use Scenario: Supplies isolated 15-V power to analog input channels (e.g., 4–20 mA receivers, RTD bridges) in programmable logic controller backplanes operating in factory environments with noisy 24-V DC bus supplies. IC Role / Device Role / Timing Role: Point-of-load regulator delivering stable 15-V rail directly at analog signal chain; rejects ripple from upstream switching converters. Use Value: Maintains <150 μVrms output noise and <150 mV load regulation-preserving 16-bit ADC accuracy without additional post-regulation filtering. |
| Point-of-Load for Legacy Industrial Equipment | Off-Board Vehicle Telematics Power Stage |
Use Scenario: Replaces aging 7815 linear regulators in retrofit applications where board space is constrained and thermal management is limited-such as HVAC controllers and motor drive interface boards. IC Role / Device Role / Timing Role: Drop-in replacement for TO-220 78xx regulators with superior thermal performance in surface-mount footprint. Use Value: Delivers same 15-V output with 41.8°C/W thermal resistance (vs. 77.9°C/W for TO-220), enabling 2× higher power density without heatsink redesign. | Use Scenario: Provides robust 15-V supply to GPS/GSM modems and CAN transceivers mounted externally on vehicle chassis-subject to vibration, moisture, and wide ambient temperature extremes. IC Role / Device Role / Timing Role: Primary regulator handling reverse-battery connection during jump-starts and 60-V load dumps during alternator fault conditions. Use Value: Guarantees uninterrupted modem operation during −30 V reverse polarity and 60 V transients-meeting OEM requirements for telematics module survival without auxiliary protection circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 15-V LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2940CT-15/NOPB | TO-220 package; 1-A output; higher dropout (1.3 V typ. at 1 A); no reverse-battery protection | Requires external reverse-polarity diode and heatsink for 500-mA automotive use; less suitable for space-constrained PCBs | Select only if higher output current is required and reverse-battery risk is mitigated externally. |
| TPS7A4701RGWR | 200-mA output; ultra-low noise (4-μVrms); adjustable output; 350-mV dropout; no transient protection | Not rated for 60-V transients or reverse-battery; requires external protection circuitry for automotive use | Choose only for ultra-low-noise analog rails where transient immunity is handled upstream. |
Compared with LM2940CT-15/NOPB, LM2937ES-15/NOPB offers lower dropout and integrated reverse-battery protection in a smaller TO-263 package; compared with TPS7A4701RGWR, it trades noise performance for ruggedness and higher current-making LM2937ES-15/NOPB the preferred choice for unhardened 15-V power in automotive and industrial edge nodes.
Availability
LM2937ES-15/NOPB is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC analog I/O modules, and point-of-load regulation in legacy equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2937ES-15/NOPB 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and consumer markets.
The LM2937 product line was engineered specifically for automotive and industrial power regulation-emphasizing ruggedness, wide-temperature operation (−40°C to 125°C), and integrated protection against real-world electrical stressors including reverse battery, load dump, and thermal overload.
FAQ
What is the maximum input voltage the LM2937ES-15/NOPB can withstand during transient events?
The LM2937ES-15/NOPB is rated for 60-V transient input events lasting up to 100 ms, per ISO 7637-2 Pulse 5a specifications. This capability is built into the silicon and does not require external TVS diodes. Continuous operation above 26 V is not recommended, but the device remains undamaged during specified transients-ensuring reliability in automotive alternator fault conditions. The LM2937ES-15/NOPB's internal overvoltage shutdown activates at ~32 V to disable output during excessive input conditions.
Does the LM2937ES-15/NOPB require an external capacitor on its INPUT pin?
Yes, the LM2937ES-15/NOPB requires a 0.1-μF ceramic capacitor placed as close as possible to the INPUT pin and GND to suppress high-frequency noise and prevent oscillation caused by trace inductance. This capacitor is mandatory for stable operation, especially when the regulator is located more than 3 inches from the main power supply filter. The LM2937ES-15/NOPB datasheet explicitly lists this as a design requirement in Section 8.2. The absence of this capacitor may result in erratic regulation or audible switching noise.
Can the LM2937ES-15/NOPB be used with a 10-μF ceramic output capacitor?
Yes, the LM2937ES-15/NOPB is stable with ceramic output capacitors as low as 10 μF, provided their ESR falls within the 10 mΩ to 3 Ω range. Unlike many older LDOs, its internal compensation relaxes ESR constraints-making it compatible with low-ESR X7R/X5R ceramics. However, ensure the capacitor's rated voltage exceeds 25 V and its capacitance remains ≥10 μF across the full −40°C to 125°C operating range. The LM2937ES-15/NOPB's stability is verified per Figure 16 in the datasheet.
Is the thermal tab (Pin 4) of the LM2937ES-15/NOPB electrically isolated?
No, the thermal tab (Pin 4) of the LM2937ES-15/NOPB is internally connected to Pin 2 (GND) and is not electrically isolated. It must be soldered directly to a GND copper pour on the PCB-never left floating or connected to any other potential. Doing so ensures both thermal performance (RθJA = 41.8°C/W) and electrical safety. The LM2937ES-15/NOPB datasheet states in Pin Functions that "the TAB is internally connected to device pin 2 (GND)" and warns against connecting it to any potential other than GND.
How does the LM2937ES-15/NOPB behave during reverse-battery connection?
During reverse-battery connection (e.g., −15 V applied to INPUT with OUTPUT grounded), the LM2937ES-15/NOPB blocks current flow and sustains no damage-thanks to integrated reverse-battery protection. It draws less than 100 μA in this state and resumes normal regulation immediately upon correct polarity restoration. This feature eliminates the need for an external series Schottky diode, reducing voltage drop and heat generation. The LM2937ES-15/NOPB is tested to withstand −30 V DC reverse input per Section 6.5 of its datasheet.
LM2937ES-15/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 15V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- 20 mA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Mirror-Image Insertion, Over Temperature, Short Circuit, Transient Voltage
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-3)
LM2937ES-15/NOPB FAQ
1.How can I place an order for LM2937ES-15/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2937ES-15/NOPB 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 LM2937ES-15/NOPB reliable?
The price and inventory of LM2937ES-15/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2937ES-15/NOPB is usually 5 days.
3.What payment methods are accepted for LM2937ES-15/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2937ES-15/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2937ES-15/NOPB?
LM2937ES-15/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2937ES-15/NOPB 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 LM2937ES-15/NOPB?
For technical support, including LM2937ES-15/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2937ES-15/NOPB requirements.
6.How does Aetrix verify that LM2937ES-15/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2937ES-15/NOPB 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 LM2937ES-15/NOPB meets industry standards.
7.What is the process for return or replacement of LM2937ES-15/NOPB?
All LM2937ES-15/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2937ES-15/NOPB, 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 LM2937ES-15/NOPB part is unused and in its original packaging.
Return procedure for LM2937ES-15/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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