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STMicroelectronics L4962E/A
- Part No.:
- L4962E/A
- Manufacturer:
- STMicroelectronics
- Package:
- Heptawatt-7 (Vertical, Bent and Staggered Leads)
- Datasheet:
-
L4962E/A.pdf
- Description:
- IC REG BUCK ADJ 1.5A 7HEPTAWATT
- Quantity:
- Payment:
- Shipping:
Inventory:1,671
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Product details
Overview
L4962E/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% on-chip reference accuracy, 100kHz typical switching frequency, and up to 90% efficiency in buck configuration for industrial power supplies.
For engineers reviewing the L4962E/A datasheet, L4962E/A pinout, L4962E/A application, or L4962E/A equivalent, this device supports fixed/adjustable DC-DC conversion with integrated soft start, current limiting, thermal shutdown, and minimal external component count - critical for compact, high-reliability 12–24V system rails.
Technical Context
The L4962E/A implements a fixed-frequency PWM control architecture with an internal 5.1V zener-trimmed reference, sawtooth oscillator, error amplifier, 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 features 0–100% duty cycle operation, internal soft-start capacitor timing (pin 6), oscillator frequency set by external RC network (pin 5), and current limiting triggered by internal sense resistor and flip-flop latch. Thermal shutdown activates at ~150°C junction temperature with hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1.5A continuous - supports medium-power industrial loads without external pass devices. |
| Output voltage range | 5.1V to 40V - programmable via external resistor divider; 5.1V fixed when pin 2 tied directly to output. |
| Reference accuracy | ±2% over temperature - enables stable regulation without trimming in cost-sensitive designs. |
| Switching frequency | 85–115kHz typ. - allows use of small, low-cost magnetics and reduces EMI compared to higher-frequency alternatives. |
| Efficiency | Up to 90% at Vo=12V, Io=1A - minimizes thermal stress and improves power density in enclosed systems. |
| Thermal resistance (j-case) | 4°C/W (Heptawatt) - enables >4W dissipation with modest heatsinking; requires GND pins soldered to PCB copper. |
| Soft-start time constant | Set by external capacitor on pin 6 - prevents inrush current and ensures controlled startup into capacitive loads. |
| Current limit threshold | 2–3.3A - protects against short-circuit and overload while permitting 1.5A continuous operation. |
Pinout & Package
The L4962E/A is housed in a Heptawatt vertical package (7-pin, single-row, through-hole), with pins 4, 5, and 12–13 designated as GND (common ground return path for power and signal). Thermal performance relies on soldering GND pins to ≥1 cm² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SUPPLY) | Unregulated input voltage supply | Accepts 9–46V input; powers internal logic via on-chip regulator - no separate bias rail needed. |
| 2 (FEEDBACK) | Regulation loop feedback input | Connects to output (for 5.1V) or resistor divider (for higher voltages); sets output voltage precision. |
| 3 (COMP) | Frequency compensation node | RC network here sets loop gain and phase margin - critical for stability across load/line variations. |
| 4,5,12,13 (GND) | Common ground reference | Low-impedance return for power, control, and thermal path - must be connected to large PCB copper for Rth(j-amb) ≤ 50°C/W. |
| 5 (OSCILLATOR) | Oscillator timing input | RC network sets switching frequency; must tie to pin 1 (SUPPLY) when using internal oscillator. |
| 6 (SOFT START) | Soft-start timing capacitor | Capacitor here defines startup ramp time and limits average short-circuit current during fault. |
| 7 (OUTPUT) | Regulated output driver | Delivers switched output to external inductor/diode; pin connects directly to buck converter output node. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.1V ±2% reference | Eliminates need for external voltage reference IC or precision resistors in feedback network. |
| 0–100% duty cycle capability | Enables dropout operation down to VIN − VOUT ≈ 1.5V - supports wide input range without losing regulation. |
| Internal current limiting & auto-recovery | Self-resetting foldback protection avoids latch-up during transient overloads - no manual reset required. |
| Thermal shutdown with hysteresis | Disables output at ~150°C and re-enables only after cooling to ~135°C - prevents cycling near thermal limit. |
| Very few external components | Requires only one inductor, one Schottky diode, two input/output capacitors, and optional feedback resistors - reduces BOM count and board space. |
Applications
| Industrial Power Supply | Programmable Bench PSU |
|---|---|
|
Use Scenario: 24V AC/DC front-end feeding isolated 12V/1.5A rail for PLC I/O modules. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing stable, efficient local power with built-in fault protection. Use Value: Eliminates need for discrete current-sense and thermal monitoring circuits - reduces design complexity and validation effort. |
Use Scenario: Lab-grade adjustable DC supply delivering 5.1–15V at 1.5A with <10mV load regulation. IC Role / Device Role / Timing Role: Core voltage-setting and switching controller with programmable feedback and soft-start for user-safe ramp-up. Use Value: Achieves ±2% output accuracy across full range using only two external resistors - no calibration required. |
| Distributed DC-DC Preregulator | Multipower System Synchronization |
|
Use Scenario: Pre-regulating 48V bus to 12V before linear regulators in telecom shelf systems. IC Role / Device Role / Timing Role: High-efficiency intermediate stage reducing heat in downstream LDOs and improving overall system efficiency. Use Value: 90% efficiency at 1A cuts dissipation by >4W vs. linear solution - extends thermal margin and simplifies heatsink design. |
Use Scenario: Multiple L4962E/A units powering ±12V rails in analog instrumentation with synchronized switching. IC Role / Device Role / Timing Role: Master-slave oscillator synchronization via pin 5 connection to suppress beat frequencies and reduce EMI peaks. Use Value: Enables clean spectral profile in noise-sensitive measurement systems - avoids 100kHz switching harmonics interference. |
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, no soft-start pin, ±4% reference accuracy | Lacks dedicated soft-start and compensation pin - requires external circuitry for controlled startup and loop tuning | Preferred where higher current is needed and layout space permits added compensation components |
| TPS5430DDAR | 3A output, 500kHz switching, integrated MOSFET, enable/shutdown pin, ±1% reference | Higher frequency demands smaller magnetics but increases EMI filtering burden; no Heptawatt through-hole option | Chosen for compact SMT designs requiring tighter voltage tolerance and faster transient response |
Compared with LM2596-ADJ and TPS5430DDAR, the L4962E/A offers superior thermal robustness in through-hole packaging, precise ±2% reference without external trimming, and dedicated pins for soft-start and loop compensation - making it optimal for industrial environments where reliability, serviceability, and design simplicity are prioritized over ultra-high frequency or SMT footprint.
Availability
L4962E/A is available at Aetrix Electronics and suitable for industrial power supplies, programmable bench PSUs, distributed DC-DC preregulators, and synchronized multi-rail systems requiring stable component supply with long lifecycle support.
Supply support for L4962E/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.
The L4962E/A belongs to ST's legacy power management IC portfolio, engineered specifically for rugged, through-hole-based industrial DC-DC conversion where thermal resilience, fault tolerance, and minimal external component count are essential.
FAQ
What is the maximum input voltage the L4962E/A can withstand?
The absolute maximum input voltage is 50V applied to pin 1 (SUPPLY), with a recommended operating range of 9V to 46V. Exceeding 50V risks permanent damage to the internal regulator and output stage, even for transient events. Input transient suppression is advised in 48V systems.
Can the L4962E/A operate in dropout mode?
Yes - the L4962E/A supports 0–100% duty cycle operation, enabling regulation down to VIN − VOUT ≈ 1.5V at full load. This allows functional operation with input as low as 6.6V for a 5.1V output, though efficiency drops significantly below 2:1 input-to-output ratio.
How is thermal performance affected by PCB layout?
Thermal resistance junction-to-ambient drops from 50°C/W (standard layout) to ~35°C/W when all four GND pins (4,5,12,13) are soldered to ≥1 cm² of 35µm copper. Insufficient copper area causes premature thermal shutdown above 2.5W dissipation - verified per Figure 33 in the datasheet.
Does the L4962E/A require an external Schottky diode?
Yes - the L4962E/A drives an external NPN transistor (not integrated), requiring a fast-recovery Schottky diode (e.g., BYW98 or Vishay VS-3EKH03) in the buck freewheeling path. Diode selection must meet 45V VRRM, ≥3A IF(AV), and low forward voltage to maintain >85% efficiency at full load.
L4962E/A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- Heptawatt-7 (Vertical, 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
L4962E/A FAQ
1.How can I place an order for L4962E/A through Aetrix?
Please submit a Request for Quotation (RFQ) for L4962E/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 L4962E/A reliable?
The price and inventory of L4962E/A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L4962E/A is usually 5 days.
3.What payment methods are accepted for L4962E/A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L4962E/A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L4962E/A?
L4962E/A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L4962E/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 L4962E/A?
For technical support, including L4962E/A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L4962E/A requirements.
6.How does Aetrix verify that L4962E/A is sourced from the original manufacturer or authorized distributors?
All L4962E/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 L4962E/A meets industry standards.
7.What is the process for return or replacement of L4962E/A?
All L4962E/A units undergo pre-shipment inspection (PSI). If there is an issue with L4962E/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 L4962E/A part is unused and in its original packaging.
Return procedure for L4962E/A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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