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STMicroelectronics E-L5972D013TR
- Part No.:
- E-L5972D013TR
- Manufacturer:
- STMicroelectronics
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
E-L5972D013TR.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,761
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Product details
Overview
E-L5972D013TR from STMicroelectronics is a monolithic step-down switching regulator IC featuring an integrated 2A P-channel D-MOS switch (RDS(on) = 250 mΩ typ), 4.4V–36V input range, adjustable 1.235V–35V output, and fixed 250 kHz switching frequency - used for efficient DC-DC conversion in 5V bus-powered systems such as LCD monitors and automotive infotainment.
For engineers reviewing the E-L5972D013TR datasheet, E-L5972D013TR pinout, E-L5972D013TR application, or E-L5972D013TR equivalent, key selection criteria include internal current limiting (2–3 A), voltage feedforward architecture, zero-load operation capability, thermal shutdown behavior, and SO8 package thermal resistance (RthJA = 65 °C/W).
Technical Context
The L5972D employs voltage-mode control with an internal error amplifier and COMP pin for external frequency compensation. Its feedforward architecture dynamically adjusts switching duty cycle based on input voltage, improving line regulation without requiring complex loop compensation.
It integrates pulse-by-pulse current limiting and feedback disconnection protection, enabling robust short-circuit recovery and safe open-loop operation. The device supports 100% duty cycle for low-dropout operation and maintains regulation down to zero load current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.4 V to 36 V - enables direct use on 5 V, 12 V, and 24 V industrial/automotive rails without pre-regulation. |
| Output Voltage Range | 1.235 V to 35 V - set via external resistor divider on FB pin; 1.235 V reference ensures ±1.2% accuracy over temperature. |
| Switching Frequency | 250 kHz (±12%) - fixed internal oscillator simplifies EMI filtering and allows compact magnetics (e.g., 33 µH inverter choke). |
| Internal Switch RDS(on) | 250 mΩ (typ) - limits conduction loss at 2 A load; enables >90% efficiency at 5 V out / 12 V in. |
| Current Limit Threshold | 2 A (min), 3 A (max) - pulse-by-pulse limiting provides constant-current short-circuit protection without latch-off. |
| Quiescent Current | 3 mA (typ) - supports low-power standby modes; drops to 2.5 mA in zero-duty-cycle condition. |
| Thermal Resistance | RthJA = 65 °C/W - defines junction-to-ambient rise under SO8 PCB layout per JEDEC 51-7 standard. |
Pinout & Package
Package: SO8 (ECOPACK®, lead-free, 5.0 mm × 4.0 mm body, 1.27 mm pitch). Thermal pad not present; power dissipation limited to 1.2 W at TA ≤ 70 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Switch node output | Connects to inductor and catch diode anode; carries high di/dt switching current; requires low-inductance routing. |
| 2,3,6,7 (GND) | Power and signal ground | Four dedicated GND pins minimize ground bounce; must be tied to single-point thermal pad plane on PCB. |
| 4 (COMP) | Error amplifier output | External RC network sets loop bandwidth and phase margin; critical for stability with ceramic output capacitors. |
| 5 (FB) | Voltage feedback input | High-impedance input referenced to 1.235 V; resistive divider ratio determines output voltage with <±1.2% tolerance. |
| 8 (VCC) | Unregulated input supply | Bias source for internal circuitry; must be decoupled with ≥10 µF ceramic capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage feedforward control | Compensates for input ripple in real time, reducing need for large output capacitance and improving transient response. |
| Zero-load current operation | Maintains regulation with no output load - essential for always-on subsystems like remote wake-up circuits. |
| Feedback disconnection protection | Prevents uncontrolled output overvoltage if FB trace opens; clamps output to safe level via internal shunt. |
| 100% duty cycle capability | Enables dropout operation down to VOUT + 0.4 V (at 2 A), supporting ultra-low VIN applications like car battery cold-crank (4.4 V min). |
| Integrated thermal shutdown | Activates at TJ ≥ 150 °C and auto-recovers after cooldown - prevents permanent damage during overload or poor heatsinking. |
Applications
| LCD Monitor Power Supply | Automotive Infotainment Core Rail |
|---|---|
|
Use Scenario: Generating stable 3.3 V and 5 V rails from 12 V vehicle battery in head-unit mainboard. IC Role / Device Role / Timing Role: Primary buck converter delivering up to 1.5 A continuous current to SoC I/O and memory subsystems. Use Value: Internal 250 mΩ switch eliminates external MOSFET; 250 kHz switching enables small 33 µH inductor and avoids AM band EMI. |
Use Scenario: Powering STB or DVD player logic board from 5 V USB or wall adapter input. IC Role / Device Role / Timing Role: Step-down regulator converting 5 V input to 1.8 V or 2.5 V core voltage for microcontrollers and audio codecs. Use Value: 4.4 V minimum input allows direct operation from 5 V bus; zero-load quiescent current (<3 mA) extends standby battery life. |
| Industrial DC-DC Converter Module | Networking XDSL Line Card Bias Supply |
|
Use Scenario: Compact 24 V to 12 V/1.5 A isolated or non-isolated converter in programmable logic controller (PLC) I/O module. IC Role / Device Role / Timing Role: High-efficiency primary regulator feeding downstream LDOs or point-of-load converters. Use Value: 36 V max input withstands 24 V rail transients; thermal shutdown protects against enclosure overheating in sealed enclosures. |
Use Scenario: Providing regulated bias for DSL analog front-end (AFE) and line driver ICs in broadband modem hardware. IC Role / Device Role / Timing Role: Non-isolated buck stage generating clean 3.3 V supply from noisy 12 V telecom rail. Use Value: Feedforward control rejects 12 V ripple; FB pin accuracy (±1.2%) ensures precise AFE reference compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-ADJ/NOPB | 3 A switch, 60 kHz fixed frequency, no feedforward, higher RDS(on) (150 mΩ @ 5 V gate drive only) | Requires external gate driver for optimal RDS(on); lower frequency demands larger magnetics; less suitable for space-constrained 5 V bus designs. | Prefer when higher peak current (3 A) and simpler compensation are prioritized over size and EMI. |
| MP1584EN-LF-Z | 3 A switch, 1.5 MHz switching, no feedforward, 150 mΩ RDS(on), requires external bootstrap capacitor | Higher frequency enables smaller inductors but increases switching losses above 12 V input; lacks zero-load operation and feedback disconnect protection. | Choose for compact footprint where 1.5 MHz operation is acceptable and feedback integrity is assured by layout. |
Compared with LM2678-ADJ/NOPB and MP1584EN-LF-Z, E-L5972D013TR uniquely combines feedforward control, zero-load regulation, and feedback disconnection protection in a proven SO8 package - making it optimal for cost-sensitive, reliability-critical 5–24 V industrial and automotive DC-DC stages.
Availability
E-L5972D013TR is available at Aetrix Electronics and suitable for LCD monitor power supplies, automotive infotainment core rails, and industrial DC-DC converter modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant ECOPACK packaging.
Supply support for E-L5972D013TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The L5972D belongs to ST's legacy monolithic DC-DC regulator product line, engineered for high-reliability, cost-optimized buck conversion in space- and thermal-constrained applications from 4.4 V to 36 V input.
FAQ
What is the minimum input voltage required for regulation at 3.3 V output?
The L5972D maintains regulation down to 4.4 V input across its full operating temperature range (−40 °C to +125 °C). At 3.3 V output, this provides sufficient headroom for the internal P-channel switch's RDS(on) drop and control circuitry, enabling reliable startup and operation even during automotive cold-crank conditions.
Can E-L5972D013TR operate without an external compensation network on the COMP pin?
No. The COMP pin is the error amplifier output and requires an external RC network (typically 22 nF capacitor and 4.7 kΩ resistor) to stabilize the control loop. Omitting compensation causes oscillation or erratic regulation, especially with low-ESR ceramic output capacitors commonly used with this device.
Does the device support synchronous rectification?
No. E-L5972D013TR uses an internal P-channel MOSFET switch and requires an external Schottky catch diode (e.g., STPS2L25U) for续流. It does not integrate or drive a synchronous N-channel MOSFET; therefore, designs must account for diode forward voltage drop and associated conduction losses.
How does feedback disconnection protection behave during open-FB fault?
When the FB pin is disconnected, the internal reference amplifier detects loss of feedback and forces the COMP pin low, clamping the output voltage near VCC × 0.25 (≈3 V at 12 V input). This prevents destructive overvoltage while allowing safe detection and system-level fault handling without latch-up or thermal runaway.
E-L5972D013TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 2A
- Frequency - Switching:
- 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
E-L5972D013TR FAQ
1.How can I place an order for E-L5972D013TR through Aetrix?
Please submit a Request for Quotation (RFQ) for E-L5972D013TR 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 E-L5972D013TR reliable?
The price and inventory of E-L5972D013TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-L5972D013TR is usually 5 days.
3.What payment methods are accepted for E-L5972D013TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-L5972D013TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for E-L5972D013TR?
E-L5972D013TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your E-L5972D013TR 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 E-L5972D013TR?
For technical support, including E-L5972D013TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-L5972D013TR requirements.
6.How does Aetrix verify that E-L5972D013TR is sourced from the original manufacturer or authorized distributors?
All E-L5972D013TR 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 E-L5972D013TR meets industry standards.
7.What is the process for return or replacement of E-L5972D013TR?
All E-L5972D013TR units undergo pre-shipment inspection (PSI). If there is an issue with E-L5972D013TR, 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 E-L5972D013TR part is unused and in its original packaging.
Return procedure for E-L5972D013TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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