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Texas Instruments 551011367-061/NOPB
- Part No.:
- 551011367-061/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- Datasheet:
-
551011367-061/NOPB.pdf
- Description:
- EVAL BOARD LM2577 LM2585 LM2587
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Product details
Overview
551011367-061/NOPB from Texas Instruments is a monolithic step-up (boost) switching voltage regulator IC featuring an integrated 3.0A NPN power switch, 52 kHz fixed-frequency oscillator, current-mode control, and built-in protection including current limit, thermal shutdown, and undervoltage lockout. It delivers regulated 12 V output from 3.5 V–40 V input and is used in compact DC-DC boost converters for industrial sensors and portable instrumentation.
For engineers reviewing the 551011367-061/NOPB datasheet, 551011367-061/NOPB pinout, 551011367-061/NOPB application, or 551011367-061/NOPB equivalent, key selection criteria include its 12 V fixed output, TO-220-5 package thermal performance (θJA = 65°C/W), 3.0 A switch current rating, and compatibility with standard off-the-shelf flyback inductors per TI's reference design guidelines.
Technical Context
The 551011367-061/NOPB implements current-mode control using an internal error amplifier (transconductance = 370 μmho, gain = 80 V/V) and comparator that regulates peak inductor current by comparing feedback voltage against a 1.230 V reference. Its 52 kHz oscillator drives the NPN switch with soft-start to limit in-rush current during startup.
It operates as a boost converter where energy transfer relies on inductor charging during switch-on (at rate VIN/L) and discharge through an external diode during switch-off (at rate (VOUT − VIN)/L). Output voltage regulation is maintained via feedback from the output to the FB pin, with internal resistive dividers for fixed 12 V versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12 V ±4% over 100–800 mA load and 3.5–10 V input; enables direct replacement of linear regulators in space-constrained 12 V rail designs. |
| Input Voltage Range | 3.5 V to 40 V; supports wide-input applications such as automotive battery monitoring (9–16 V nominal) and industrial 24 V systems with brownout tolerance. |
| Switch Current Rating | 3.0 A continuous (6.0 A absolute max); defines maximum inductor peak current and constrains output power to ~24 W at 12 V with typical efficiency. |
| Oscillator Frequency | 52 kHz (±8 kHz over temp); enables use of low-cost, high-saturation-current ferrite inductors while minimizing EMI filtering requirements. |
| Efficiency | ≥80% at 5 V input, 800 mA load; reduces thermal load in sealed enclosures and extends battery life in portable equipment. |
| Protection Features | Current limit, thermal shutdown, and undervoltage lockout (UVLO = 2.9 V typ., 2.7–3.1 V range); ensures safe operation during fault conditions without external circuitry. |
| Reference Voltage | 1.230 V ±1.3% (1.214–1.246 V); sets precision of output regulation and determines feedback resistor ratio tolerance budget in adjustable variants. |
Pinout & Package
551011367-061/NOPB is housed in a 5-lead TO-220 (T) package with exposed tab for thermal dissipation (θJA = 65°C/W, θJC = 2°C/W). The tab is electrically connected to Pin 2 (Ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Power input (VIN) | Accepts 3.5–40 V unregulated DC; requires local 100 μF low-ESR capacitor for stability and transient response. |
| 2 - Ground | Power and signal ground | Common return for input, output, feedback, and internal circuits; must be tied directly to exposed tab for thermal and noise integrity. |
| 3 - Feedback | Output voltage sense input | Internally connected to 1.230 V reference; for 12 V version, tied directly to output; for ADJ versions, forms resistor divider with external R1/R2. |
| 4 - Switch | NPN collector output | Drives external Schottky/flyback diode; switches at 52 kHz; peak voltage reaches VOUT + VF (≤60 V max). |
| 5 - Output | Regulated 12 V output | Delivers up to 800 mA; requires ≥680 μF electrolytic output capacitor (low-ESR) for ripple suppression and load transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.0 A NPN switch | Eliminates need for external power transistor and driver, reducing BOM count and PCB area in boost topologies. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting, improves line/load transient response, and simplifies loop compensation vs. voltage-mode. |
| 52 kHz fixed-frequency oscillator | Enables predictable EMI profile and eliminates external timing components-no resistor/capacitor required for frequency setting. |
| Soft-start function | Reduces input in-rush current during startup by gradually increasing duty cycle, preventing input rail collapse in multi-rail systems. |
| Thermal shutdown & UVLO | Protects device under overload or low-input conditions without external supervision circuitry, enhancing system reliability. |
Applications
| Industrial Sensor Power Supply | Automotive Battery Monitor |
|---|---|
|
Use Scenario: Powering 4–20 mA loop-powered pressure/temperature transmitters from 3.3 V or 5 V microcontroller rails. IC Role / Device Role / Timing Role: Step-up regulator generating stable 12 V from low-voltage MCU supply to drive analog front-end and sensor excitation circuitry. Use Value: Enables single-supply operation of legacy 12 V sensors without dedicated higher-voltage rails, reducing system complexity and cost. |
Use Scenario: Boosting vehicle battery voltage (9–16 V) to a clean 12 V rail for ADC reference and CAN transceiver bias in battery management units. IC Role / Device Role / Timing Role: Regulated 12 V source tolerant of cold-crank dips below 6 V, maintaining CAN communication during engine start. Use Value: Sustains critical diagnostics and telemetry functions during low-battery events where linear regulators would dropout. |
| Portable Test Equipment | Legacy Industrial I/O Module |
|
Use Scenario: Generating 12 V from two Li-ion cells (6–8.4 V) to power op-amp signal chains and LCD backlights in handheld DMMs. IC Role / Device Role / Timing Role: High-efficiency boost converter with soft-start preventing display flicker or measurement glitches during power-on. Use Value: Extends battery runtime by >20% versus linear solutions while meeting tight 12 V ±5% accuracy requirements. |
Use Scenario: Replacing aging discrete boost circuits in programmable logic controller (PLC) I/O modules requiring isolated 12 V for field-side drivers. IC Role / Device Role / Timing Role: Drop-in upgrade path for obsolete discrete designs, delivering same 12 V output with improved thermal margin and reliability. Use Value: Reduces redesign effort and qualification time by reusing existing transformer/diode layout while improving MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2577T-12 | Same silicon die, identical electrical specs, TO-220-5 package; differs only in part numbering convention and screening level (commercial vs. extended temp). | Identical functional behavior in boost, flyback, and forward topologies; validated for same inductor families (e.g., AIE L47–L680). | Select LM2577T-12 when sourcing from distributors with broader stock of TI's standard commercial-grade marking. |
| TPS61088RHLR | Modern 2.2 MHz synchronous boost IC; 10 A switch, 2.7–12 V input, adjustable output; requires external compensation and has different pinout. | Better suited for ultra-compact, high-efficiency designs needing >1 A output or <1 mm height; not pin-compatible or drop-in. | Choose TPS61088RHLR only when upgrading for higher power density, lower ripple, or wider input range-requires full schematic/layout revision. |
Compared with LM2577T-12, 551011367-061/NOPB offers identical performance and footprint but may differ in traceability and lot-level documentation; versus TPS61088RHLR, it trades higher efficiency and smaller size for proven robustness in harsh environments and simpler external component count.
Availability
551011367-061/NOPB is available at Aetrix Electronics and suitable for industrial sensor power supplies, automotive battery monitors, and portable test equipment requiring stable component supply with long-term lifecycle support.
Supply support for 551011367-061/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in switching regulator design and manufacturing.
The LM2577 family was engineered for cost-sensitive, high-reliability DC-DC conversion in industrial, automotive, and instrumentation applications where simplicity, thermal robustness, and minimal external components are critical.
FAQ
What is the maximum output current supported by the 551011367-061/NOPB?
The 551011367-061/NOPB delivers up to 800 mA at 12 V output under typical conditions (5 V input, 25°C ambient, proper heatsinking). Its internal 3.0 A NPN switch allows higher peak currents, but sustained output is limited by thermal dissipation in the TO-220 package and external component ratings. Derating is required above 70°C ambient.
Does the 551011367-061/NOPB require an external diode, and what type is recommended?
Yes, the 551011367-061/NOPB requires an external Schottky or fast-recovery diode connected between the Switch (Pin 4) and Output (Pin 5). A 3 A, 40 V Schottky diode (e.g., MBR340) is recommended to minimize conduction loss and reverse recovery noise, ensuring stable operation and high efficiency across the input range.
Can the 551011367-061/NOPB be used in flyback or forward converter topologies?
Yes, the 551011367-061/NOPB is explicitly designed for flyback and forward converter configurations per its datasheet. Its current-mode control, 65 V switch standoff, and integrated protection make it suitable for isolated multi-output designs-TI provides reference transformers and layout guidance for these topologies in SNOS658C.
What is the purpose of the Feedback (FB) pin on the 551011367-061/NOPB?
The Feedback (FB) pin on the 551011367-061/NOPB senses output voltage and compares it to an internal 1.230 V reference. In the 12 V fixed version, it is internally tied to the output; in adjustable versions, external resistors set the output. This closed-loop control maintains regulation despite input or load variations.
How does the soft-start function of the 551011367-061/NOPB improve system reliability?
The soft-start function in the 551011367-061/NOPB gradually increases the duty cycle at power-up, limiting in-rush current into the output capacitor. This prevents input voltage sag, avoids tripping upstream current limits, and eliminates turn-on transients that could disrupt sensitive analog or digital circuitry downstream of the 551011367-061/NOPB.
551011367-061/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- WEBENCH® Buildit Board
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Main Purpose:
- DC/DC, Step Up
- Outputs and Type:
- -
- Voltage - Output:
- -
- Current - Output:
- -
- Voltage - Input:
- -
- Regulator Topology:
- -
- Frequency - Switching:
- Boost
- Contents:
- -
- Utilized IC / Part:
- Unpopulated (Bare) Board(s)
- Power - Output:
- LM2577, LM2585, LM2587
551011367-061/NOPB FAQ
1.How can I place an order for 551011367-061/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for 551011367-061/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 551011367-061/NOPB reliable?
The price and inventory of 551011367-061/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 551011367-061/NOPB is usually 5 days.
3.What payment methods are accepted for 551011367-061/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 551011367-061/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 551011367-061/NOPB?
551011367-061/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 551011367-061/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 551011367-061/NOPB?
For technical support, including 551011367-061/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 551011367-061/NOPB requirements.
6.How does Aetrix verify that 551011367-061/NOPB is sourced from the original manufacturer or authorized distributors?
All 551011367-061/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 551011367-061/NOPB meets industry standards.
7.What is the process for return or replacement of 551011367-061/NOPB?
All 551011367-061/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with 551011367-061/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 551011367-061/NOPB part is unused and in its original packaging.
Return procedure for 551011367-061/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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