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STMicroelectronics L4962/A
- Part No.:
- L4962/A
- Manufacturer:
- STMicroelectronics
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
L4962/A.pdf
- Description:
- IC REG BUCK ADJ 1.5A 16POWERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,259
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Product details
Overview
L4962/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, internal soft start, and thermal shutdown. It operates up to 150kHz switching frequency in Powerdip (12+2+2) package and supports continuous 0–100% duty cycle for stable regulation in industrial power supplies.
For engineers reviewing the L4962/A datasheet, L4962/A pinout, L4962/A application, or L4962/A equivalent, this device is selected for high-efficiency DC-DC conversion where input voltage ranges from 9V to 46V, output load current reaches 1.5A, and minimal external components are required for fixed or programmable 5.1V–40V outputs.
Technical Context
The L4962/A integrates a sawtooth oscillator, error amplifier, comparator, and power output stage in a single IC. Regulation relies on comparison between feedback voltage and a zener-zap-trimmed 5.1V internal reference, generating PWM pulses at 85–115kHz typical frequency.
Current limiting is implemented via internal metal resistor sensing and flip-flop-based disable/re-enable logic; soft start uses a constant-current source charging an external capacitor on pin 6, controlling both startup ramp and average short-circuit current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1.5A max continuous - supports industrial loads without external current boosting |
| Output voltage range | 5.1V to 40V - programmable via external resistor divider; 5.1V fixed when pin 2 connected directly to output |
| Reference accuracy | ±2% over temperature - enables stable regulation without trimming resistors |
| Switching frequency | 85–115kHz typ. - allows compact magnetics and low EMI filter size |
| Efficiency | Up to 90% at Vo=12V, Io=1A - reduces thermal load and heatsink requirements |
| Duty cycle range | 0–100% - supports wide input-output differentials including near-dropout operation |
| Thermal shutdown | 150°C junction - hysteresis prevents oscillation during overload recovery |
Pinout & Package
L4962/A is supplied in 16-lead Powerdip plastic package (12 + 2 + 2 configuration), with GND pins (4, 5, 12, 13) thermally optimized for PCB copper heatsinking. Rth j-amb = 80°C/W (unmounted), reduced to ≤50°C/W with proper ground pad layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 6, 8, 9, 16 | No connect | Not internally bonded - must remain unconnected to avoid parasitic coupling |
| 2 / 10 | Feedback input | Regulation node: direct connection yields 5.1V; resistor divider sets higher outputs |
| 4, 5, 12, 13 | Ground | Common return path for power and control circuits; critical for thermal performance |
| 5 / 14 | Oscillator | RC network sets switching frequency; tied to pin 7 when internal oscillator used |
| 6 / 15 | Soft start | External capacitor defines startup time and limits average short-circuit current |
| 7 / 2 | Output | Switched output node - connects to inductor and freewheeling diode |
| 1 / 7 | Supply voltage | Unregulated input (5–50V); powers internal logic and gate driver independently |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.1V ±2% reference | Eliminates need for external precision reference; enables accurate programmable outputs |
| Internal current limiting | 2–3.3A threshold with automatic recovery - protects against sustained overloads without latch-up |
| Soft start with programmable timing | Capacitor on pin 6 controls linear output ramp and limits peak inrush current |
| Thermal shutdown with hysteresis | Disables output at 150°C; resumes only after junction cools ~10°C - prevents cycling |
| High-frequency operation (≤150kHz) | Reduces size/cost of inductors and output capacitors vs. lower-frequency alternatives |
Applications
| Industrial Programmable Power Supply | DC-DC Preregulator |
|---|---|
|
Use Scenario: Adjustable bench supply delivering 5.1V–15V at 1.5A for lab testing and prototype validation. IC Role / Device Role / Timing Role: Primary step-down regulator with programmable output set by R3/R4 divider per ST application Fig.28. Use Value: Achieves <10mV load regulation (0.5–1.5A) and <15mV line regulation - meets precision lab supply requirements. |
Use Scenario: Pre-regulating 48V bus down to 12V before feeding linear regulators in distributed power systems. IC Role / Device Role / Timing Role: High-efficiency intermediate converter reducing dissipation in downstream LDOs (Fig.31). Use Value: 90% efficiency at 12V/1A minimizes heat generation and improves system-level thermal margin. |
| Multi-Rail Synchronized Supply | Fixed 5.1V Industrial Converter |
|
Use Scenario: Generating ±12V and 5.1V rails simultaneously using multiple L4962/A units synchronized via shared oscillator signal. IC Role / Device Role / Timing Role: Master-slave configured switching regulator enabling ripple cancellation across rails (Fig.30). Use Value: Synchronization eliminates beat frequencies and simplifies EMI filtering for multi-output systems. |
Use Scenario: Compact 5.1V/1.5A fixed-output supply for embedded controllers requiring minimal BOM count. IC Role / Device Role / Timing Role: Minimal-component regulator with pin-2-to-output connection (Fig.27). Use Value: Only requires one inductor, one diode, two capacitors, and no feedback resistors - reduces cost and board area. |
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 |
|---|---|---|---|
| LM2596-5.0 | Fixed 5V output only; no adjustable range; lower max input (40V); 3A rated but derated above 25°C | Suitable for cost-sensitive 5V-only designs; lacks programmability and wide-VIN support | Select when fixed 5V output suffices and thermal headroom is ample; not suitable for >5.1V or >40VIN |
| TPS5430 | Higher switching frequency (up to 500kHz); integrated MOSFET; requires external compensation; 3A rating | Better suited for ultra-compact designs needing smaller inductors; more complex loop tuning | Choose for space-constrained layouts where 500kHz operation justifies added design effort and cost |
Compared with LM2596-5.0 and TPS5430, the L4962/A uniquely combines wide 5.1–40V programmability, 1.5A capability at 150kHz, and zero external compensation in a through-hole package - ideal for robust industrial converters where layout simplicity and thermal reliability outweigh ultra-high-frequency miniaturization.
Availability
L4962/A is available at Aetrix Electronics and suitable for industrial programmable power supplies, DC-DC preregulators, synchronized multi-rail systems, and fixed 5.1V embedded converters requiring stable component supply across extended production lifecycles.
Supply support for L4962/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, specializing in power management, analog, microcontrollers, and automotive ICs with vertical manufacturing and broad industrial qualification.
L4962/A belongs to ST's legacy monolithic switching regulator product line, designed specifically for rugged, low-component-count DC-DC conversion in industrial equipment, test instrumentation, and distributed power architectures.
FAQ
What is the maximum input voltage the L4962/A can withstand?
The absolute maximum input voltage is 50V applied to pin 1 (SUPPLY), with a maximum input-to-output differential of 50V. For reliable operation, ST specifies Vi ≤ 46V under normal conditions. Exceeding 46V risks exceeding internal transistor breakdown limits and invalidates thermal derating curves.
Can the L4962/A be used for negative output configurations?
No - the L4962/A is a buck (step-down) regulator with a grounded switch node and non-inverting topology. Its internal architecture does not support inverting or negative-output configurations. ST's application note Fig.29 shows a separate negative rail generated by a second L4962/A in a dedicated inverting auxiliary stage, not by reconfiguring the same IC.
How is output voltage accuracy affected by temperature?
The internal reference exhibits an average temperature coefficient of 0.4 mV/°C over –40°C to +125°C, contributing ≤12mV drift across full junction range. Combined with ±2% initial tolerance, total output variation remains within ±3% over temperature for properly compensated designs.
Is external compensation required for stable operation?
No - the L4962/A features internal frequency compensation. Pin 11 (Frequency Compensation) is not used in standard configurations; ST's recommended circuits (Figs.25–27) operate stably without external RC networks on that pin. External compensation is only needed for custom loop shaping beyond datasheet-specified performance.
L4962/A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- 16-PowerDIP
L4962/A FAQ
1.How can I place an order for L4962/A through Aetrix?
Please submit a Request for Quotation (RFQ) for L4962/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 L4962/A reliable?
The price and inventory of L4962/A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L4962/A is usually 5 days.
3.What payment methods are accepted for L4962/A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L4962/A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L4962/A?
L4962/A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L4962/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 L4962/A?
For technical support, including L4962/A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L4962/A requirements.
6.How does Aetrix verify that L4962/A is sourced from the original manufacturer or authorized distributors?
All L4962/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 L4962/A meets industry standards.
7.What is the process for return or replacement of L4962/A?
All L4962/A units undergo pre-shipment inspection (PSI). If there is an issue with L4962/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 L4962/A part is unused and in its original packaging.
Return procedure for L4962/A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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