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STMicroelectronics L4962EH/A
- Part No.:
- L4962EH/A
- Manufacturer:
- STMicroelectronics
- Package:
- Heptawatt-7 (Horizontal, Bent and Staggered Leads)
- Datasheet:
-
L4962EH/A.pdf
- Description:
- IC REG BUCK ADJ 1.5A 7HEPTAWATT
- Quantity:
- Payment:
- Shipping:
Inventory:3,240
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Product details
Overview
L4962EH/A from STMicroelectronics is a monolithic step-down switching regulator delivering 1.5A output current with adjustable output voltage from 5.1V to 40V, ±2% internal reference accuracy, up to 150kHz switching frequency, and thermal shutdown protection - used in industrial DC-DC conversion where compact high-efficiency regulation is required.
For engineers reviewing the L4962EH/A datasheet, L4962EH/A pinout, L4962EH/A application, or L4962EH/A equivalent, key selection considerations include its Heptawatt horizontal package, soft-start capacitor timing control, internal current limiting threshold (2–3.3A), and oscillator frequency-setting RC network on Pin 5.
Technical Context
The L4962EH/A implements a fixed-frequency PWM control architecture with an internal 5.1V zener-trimmed reference, error amplifier, sawtooth oscillator, and comparator driving a bipolar output stage. Regulation is achieved by comparing feedback voltage (Pin 2) against the internal reference and modulating duty cycle via PWM.
It supports 0–100% duty cycle for continuous conduction mode, features internal soft-start (Pin 6 capacitor-controlled ramp), current limiting via sensed metal resistor, and thermal shutdown at ~150°C with hysteresis. Oscillator frequency (85–115kHz typ.) is set externally via Pin 5 RC network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1.5A max continuous - supports medium-power industrial loads without external pass devices. |
| Output voltage range | 5.1V to 40V - adjustable via external resistor divider on feedback pin (Pin 2). |
| Reference accuracy | ±2% over temperature - enables stable regulation without trimming in most applications. |
| Switching frequency | 85–115kHz typical - balances EMI, efficiency, and external component size (inductor/capacitor). |
| Efficiency | Up to 90% at Vo=12V, Io=1A - reduces thermal load and improves power density vs linear regulators. |
| Thermal shutdown | Triggers at ~150°C junction temperature - protects device during overload or poor heatsinking. |
| Soft-start time | Controlled by capacitor on Pin 6 - prevents inrush current and output overshoot at startup. |
Pinout & Package
L4962EH/A uses the Horizontal Heptawatt package (7-pin, staggered lead layout), optimized for PCB surface-mount thermal dissipation with GND pins (4, 5, 12, 13) soldered to copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 6, 8, 9, 16 | No connect | Internally unconnected - must remain floating; no routing or soldering required. |
| 2 | Feedback input | Voltage sensing node for regulation loop; connects directly to output for 5.1V or via divider for higher voltages. |
| 4, 5, 12, 13 | Ground | Common return path for logic, oscillator, and power stages; critical for thermal performance when soldered to copper area. |
| 5 (Heptawatt) | Oscillator | RC network connection point (R to VIN, C to GND) sets switching frequency; tied to Pin 7 when internal oscillator used. |
| 6 | Soft start | Capacitor-to-ground node controlling startup ramp rate and average short-circuit current limit. |
| 7 | Output | Regulated DC output terminal - drives external inductor and catch diode in buck topology. |
| 10 | Reference voltage | 5.1V ±2% internal reference output - used for feedback sensing and precision monitoring. |
| 11 | Frequency compensation | External RC network adjusts loop gain and phase margin for stable regulation across load/line conditions. |
| 14 | Oscillator source | Current source for external RC timing network; connects to Pin 5 to complete oscillator circuit. |
| 15 | Soft start current source/sink | Provides constant current (100–180µA source / 50–120µA sink) to charge/discharge soft-start capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic buck regulator | Integrates PWM controller, reference, error amp, oscillator, and bipolar output stage - eliminates need for external driver or gate logic. |
| Adjustable output (5.1–40V) | Set via two-resistor divider on Pin 2 - supports wide-range industrial supplies without redesigning core regulator. |
| Internal current limiting | Threshold of 2–3.3A - protects switch and inductor during overload or short-circuit without external sense resistor. |
| Thermal shutdown with hysteresis | Activates at ~150°C, resets ~20°C below - prevents thermal oscillation and ensures safe recovery after fault. |
| 0–100% duty cycle operation | Enables continuous conduction mode down to low output/input ratios - improves light-load efficiency and ripple. |
Applications
| Industrial Power Supply | Programmable Bench Supply |
|---|---|
|
Use Scenario: Fixed or adjustable 12–24V DC supply for PLC I/O modules and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary step-down regulator converting 36–48V DC bus to stable 12V/24V outputs with minimal external components. Use Value: High efficiency (≥80%) reduces heat buildup in enclosed enclosures; thermal shutdown ensures reliability during ambient temperature spikes. |
Use Scenario: Lab-grade bench power supply with user-adjustable 5.1–15V output and 1.5A current limit. IC Role / Device Role / Timing Role: Core voltage-regulation engine with soft-start and current limiting enabling clean, repeatable voltage programming. Use Value: ±2% reference and <20mV load regulation support precise output setting; soft-start capacitor (Pin 6) eliminates output overshoot during voltage changes. |
| Distributed DC-DC Conversion | Preregulator for Linear Stages |
|
Use Scenario: Local 5.1V/12V generation from 48V telecom or PoE-derived bus in multi-rail embedded systems. IC Role / Device Role / Timing Role: Efficient intermediate-stage buck converter feeding downstream LDOs or point-of-load regulators. Use Value: Up to 150kHz switching allows small, low-cost inductors; synchronization capability (via Pin 5) minimizes system-level EMI in dense layouts. |
Use Scenario: Pre-regulation stage ahead of linear regulators (e.g., 78xx series) to reduce dropout and thermal stress. IC Role / Device Role / Timing Role: Input-voltage reducer lowering 36V input to ~8V for linear regulator input, minimizing power dissipation. Use Value: Dropout voltage ≤2V at 1.5A enables >25% power savings vs direct linear regulation; internal current limiting protects both stages during faults. |
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 |
|---|---|---|---|
| LM2596-ADJ | 3A output, 150kHz fixed frequency, requires external compensation; no integrated soft-start capacitor control. | Higher current but less precise reference (±4%); lacks dedicated soft-start timing pin - needs external circuitry for controlled ramp. | Choose LM2596-ADJ only if >1.5A output or lower BOM cost is prioritized over reference accuracy and startup control. |
| TPS5430DDAR | 3A output, 500kHz switching, integrated MOSFET, requires external bootstrap capacitor; no internal bipolar output stage. | Higher frequency enables smaller magnetics but increases EMI filtering complexity; no built-in thermal hysteresis. | Prefer TPS5430DDAR for space-constrained designs needing >150kHz operation, but verify thermal management without hysteresis behavior. |
Compared with LM2596-ADJ and TPS5430DDAR, L4962EH/A offers superior reference accuracy (±2% vs ±4% or ±1%), dedicated soft-start timing (Pin 6), and thermal hysteresis - making it better suited for stable industrial supplies where precision and fault recovery are critical.
Availability
L4962EH/A is available at Aetrix Electronics and suitable for industrial power supplies, programmable bench supplies, distributed DC-DC conversion, and preregulator circuits requiring stable component supply with long-lifecycle support.
Supply support for L4962EH/A 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, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
L4962EH/A belongs to ST's legacy power management IC portfolio, engineered specifically for robust, low-component-count DC-DC conversion in harsh industrial environments with wide input ranges and thermal resilience.
FAQ
What is the maximum input voltage rating for L4962EH/A?
The absolute maximum input voltage (Pin 7 to Pin 2) is 50V, and the maximum input-to-output differential is also rated at 50V. Operation above 46V input is not recommended per electrical characteristics testing - sustained use beyond 46V risks exceeding thermal limits or degrading long-term reliability even if within absolute max ratings.
Can L4962EH/A be synchronized to an external clock?
No - L4962EH/A does not support external clock synchronization. Its oscillator is internally generated and set solely by the RC network on Pin 5. Multiple L4962EH/A units can be loosely synchronized by connecting their Pin 5 nodes together, but this is not true master-slave synchronization and may cause beat frequencies.
How is output voltage adjusted above 5.1V?
Output voltage is increased above 5.1V using a resistor divider between output (Pin 7) and ground, with the midpoint connected to Pin 2 (feedback). The ratio determines scaling: Vo = 5.1V × (1 + R3/R4). Standard values for 12V, 15V, 18V, and 24V are provided in the datasheet (e.g., R3 = 4.7kΩ, R4 = 6.2kΩ for 12V).
What thermal derating applies when using the Heptawatt package without heatsink?
With GND pins soldered to minimal copper (as in "*" footnote), Rth j-amb is 50°C/W. At 25°C ambient, max allowable power dissipation is ~1.5W before reaching 150°C junction limit - corresponding to ~1.2A at 12V output (assuming 2V dropout). Larger copper areas reduce Rth and increase usable current.
L4962EH/A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- Heptawatt-7 (Horizontal, Bent and Staggered Leads)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 9V
- Voltage - Input (Max):
- 46V
- Voltage - Output (Min/Fixed):
- 5.1V
- Voltage - Output (Max):
- 40V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 7-HEPTAWATT
L4962EH/A FAQ
1.How can I place an order for L4962EH/A through Aetrix?
Please submit a Request for Quotation (RFQ) for L4962EH/A 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 L4962EH/A reliable?
The price and inventory of L4962EH/A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L4962EH/A is usually 5 days.
3.What payment methods are accepted for L4962EH/A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L4962EH/A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L4962EH/A?
L4962EH/A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L4962EH/A 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 L4962EH/A?
For technical support, including L4962EH/A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L4962EH/A requirements.
6.How does Aetrix verify that L4962EH/A is sourced from the original manufacturer or authorized distributors?
All L4962EH/A 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 L4962EH/A meets industry standards.
7.What is the process for return or replacement of L4962EH/A?
All L4962EH/A units undergo pre-shipment inspection (PSI). If there is an issue with L4962EH/A, 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 L4962EH/A part is unused and in its original packaging.
Return procedure for L4962EH/A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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