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Texas Instruments LM2577T-15/NOPB
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- Part No.:
- LM2577T-15/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5
- Datasheet:
-
LM2577T-15/NOPB.pdf
- Description:
- IC REG BST FLYBCK 15V 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,969
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Product details
Overview
LM2577T-15/NOPB from Texas Instruments is a monolithic step-up (boost) switching voltage regulator with fixed 15 V output, integrated 3.0 A NPN switch, 52 kHz oscillator, and current-mode control architecture. It operates from 3.5 V to 40 V input, delivers up to 600 mA load current, and includes undervoltage lockout, thermal shutdown, and current limiting-used in industrial power supplies and battery-powered instrumentation.
For engineers reviewing the LM2577T-15/NOPB datasheet, LM2577T-15/NOPB pinout, LM2577T-15/NOPB application, or LM2577T-15/NOPB equivalent, key selection criteria include input voltage range compatibility, output current capability at 15 V, thermal performance in TO-220 package, and external component count for boost topology implementation.
Technical Context
The LM2577T-15/NOPB implements current-mode PWM control using an internal error amplifier, 15 V reference, and comparator that terminates switch-on time based on sensed inductor current. Its fixed-frequency 52 kHz oscillator eliminates external timing components, while soft-start reduces inrush current during startup.
As a non-synchronous boost controller, it drives an external diode and inductor to generate regulated 15 V output. The integrated NPN switch has 65 V breakdown rating and 0.7 V saturation voltage at 2.0 A, enabling operation across wide input ranges without external gate drivers or high-side sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15 V ±3% over 100–600 mA load and 3.5–40 V input - ensures stable rail for analog sensors or logic interfaces. |
| Input Voltage Range | 3.5 V to 40 V - supports single-cell Li-ion up to 24 V industrial bus inputs without pre-regulation. |
| Switch Current Limit | 3.0 A typical, 3.7 A min - defines maximum peak inductor current and constrains minimum inductance selection. |
| Oscillator Frequency | 52 kHz ±8% - sets switching period for EMI filtering and inductor size; fixed, no external RC required. |
| Thermal Resistance θJA | 65 °C/W (TO-220 package) - requires ≥1 in² copper pour for full 3.0 A continuous operation at 25 °C ambient. |
| Undervoltage Lockout | 2.70 V to 3.10 V threshold - prevents erratic startup below valid operating voltage, improving system reliability. |
| Efficiency | ≥80% at 5 V input, 600 mA load - enables compact, low-loss boost conversion without active cooling. |
Pinout & Package
LM2577T-15/NOPB uses a 5-lead TO-220 (T) package with straight leads (NS Package Number T05A). The case is electrically connected to Pin 2 (Ground), requiring isolation from heatsink unless grounded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Power input (VIN) | Accepts 3.5–40 V DC; must be bypassed with ≥100 μF electrolytic capacitor near pin. |
| 2 - Ground | Power and signal reference | Common return for input, output, feedback, and compensation; tied to TO-220 tab. |
| 3 - Output Switch | NPN collector output | Drives external flyback diode and inductor; switches at 52 kHz with 65 V standoff rating. |
| 4 - Feedback | Voltage sense input | Internally referenced to 15 V; connected directly to output for fixed-voltage operation. |
| 5 - Compensation | Error amplifier output | Provides loop compensation node; typically connected to RC network for stability tuning. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.0 A NPN switch | Eliminates need for external MOSFET and driver; simplifies layout and reduces BOM count in boost designs. |
| Current-mode control | Improves line and load transient response, enables inherent cycle-by-cycle current limiting, and simplifies loop compensation. |
| 52 kHz fixed-frequency oscillator | Removes external timing components; enables predictable EMI profile and consistent inductor sizing across production lots. |
| Soft-start function | Reduces input inrush current during startup by gradually increasing duty cycle - prevents input rail collapse in battery systems. |
| Comprehensive protection | Combines undervoltage lockout, thermal shutdown, and current limiting to prevent damage under fault conditions without external circuitry. |
Applications
| Industrial Sensor Power Supply | Portable Test Equipment |
|---|---|
|
Use Scenario: Powers 15 V analog front-end circuits (e.g., op-amps, ADC references) from 5–12 V battery or USB input. IC Role / Device Role / Timing Role: Primary DC-DC boost regulator generating stable 15 V rail with minimal external parts. Use Value: Delivers 600 mA at 15 V with ≤100 mV load regulation, enabling precision analog performance without LDO post-regulation. |
Use Scenario: Supplies 15 V bias to oscilloscope vertical amplifiers or spectrum analyzer mixers from single 7.4 V Li-Po pack. IC Role / Device Role / Timing Role: High-efficiency step-up converter operating across wide input range with fast transient recovery. Use Value: 80% efficiency at 5 V input/600 mA load extends battery runtime; current-mode control suppresses noise coupling into sensitive RF stages. |
| Automotive Aftermarket Display | Legacy Industrial Control Module |
|
Use Scenario: Generates 15 V for TFT-LCD backlight drivers or CAN transceiver bias from 9–16 V vehicle battery. IC Role / Device Role / Timing Role: Robust boost regulator handling cold-crank (6.5 V) and load-dump (40 V) transients via input range and protection features. Use Value: Undervoltage lockout prevents malfunction below 2.7 V; 65 V switch rating withstands load-dump spikes without clamping diodes. |
Use Scenario: Replaces aging discrete boost circuits in PLC I/O modules requiring +15 V for op-amp rails and DAC buffers. IC Role / Device Role / Timing Role: Drop-in upgrade to monolithic solution reducing footprint, improving thermal margin, and eliminating discrete transistor failures. Use Value: TO-220 package allows direct heatsink mounting; thermal shutdown protects against sustained overload in enclosed enclosures. |
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/NOPB | Fixed 12 V output; identical pinout, package, and electrical specs except reference voltage and output tolerance. | Suitable where 12 V rail is required instead of 15 V; same external component values except output capacitor voltage rating. | Select when system requires 12 V output and existing design uses LM2577T-15/NOPB footprint - only output capacitor and feedback routing differ. |
| LM2577T-ADJ/NOPB | Adjustable output (1.23 V to 60 V); requires two external resistors for feedback; same switch, oscillator, and protection features. | Enables programmable output voltage but increases BOM count and layout sensitivity; lower accuracy than fixed versions. | Choose when variable output or voltages beyond 15 V are needed; avoid if fixed 15 V suffices due to added resistor tolerance sensitivity. |
Compared with LM2577T-12/NOPB and LM2577T-ADJ/NOPB, the LM2577T-15/NOPB offers optimal accuracy and simplicity for 15 V applications-eliminating feedback resistors while maintaining identical thermal, switching, and protection behavior across the family.
Availability
LM2577T-15/NOPB is available at Aetrix Electronics and suitable for industrial sensor power supplies, portable test equipment, automotive displays, and legacy control modules requiring stable component supply and long-term manufacturability.
Supply support for LM2577T-15/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 ICs, with decades of expertise in switching regulator design and manufacturing.
The LM2577 series belongs to TI's SIMPLE SWITCHER® portfolio-designed specifically for cost-sensitive, low-component-count DC-DC conversion in industrial, automotive, and instrumentation applications.
FAQ
What is the maximum output current capability of the LM2577T-15/NOPB?
The LM2577T-15/NOPB delivers up to 600 mA continuous output current at 15 V under typical conditions (5 V input, 25 °C ambient, adequate heatsinking). Peak switch current is limited to 3.0 A internally, but actual output current depends on input voltage, thermal management, and external component selection-especially inductor DCR and diode forward voltage.
Does the LM2577T-15/NOPB require external feedback resistors?
No. The LM2577T-15/NOPB is a fixed-output variant with internal 15 V reference; the feedback pin (Pin 4) connects directly to the output node. External resistors are only required for the adjustable version (LM2577T-ADJ/NOPB), not for LM2577T-15/NOPB.
What package type does the LM2577T-15/NOPB use, and how is thermal performance affected?
The LM2577T-15/NOPB uses a 5-lead TO-220 (T) package (NS Package Number T05A). Its junction-to-ambient thermal resistance is 65 °C/W with standard PCB layout; adding ≥1 in² copper pour reduces θJA significantly, enabling full 3.0 A switch current capability without exceeding 125 °C junction temperature.
Can the LM2577T-15/NOPB operate from a 3.3 V input source?
No. The LM2577T-15/NOPB has a minimum input voltage of 3.5 V per its operating ratings. At 3.3 V, undervoltage lockout activates and the device remains disabled. For 3.3 V input, consider the LM2577T-ADJ/NOPB with appropriate feedback divider or alternative low-VIN boost regulators.
How does the current-mode control architecture benefit system design with the LM2577T-15/NOPB?
The current-mode control in LM2577T-15/NOPB provides inherent cycle-by-cycle current limiting, improves transient response to load steps, enhances line regulation, and simplifies loop compensation compared to voltage-mode controllers-reducing design iteration time and improving robustness in variable-input applications.
LM2577T-15/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, Forward Converter
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 15V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A (Switch)
- Frequency - Switching:
- 52kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LM2577T-15/NOPB FAQ
1.How can I place an order for LM2577T-15/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2577T-15/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 LM2577T-15/NOPB reliable?
The price and inventory of LM2577T-15/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2577T-15/NOPB is usually 5 days.
3.What payment methods are accepted for LM2577T-15/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2577T-15/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2577T-15/NOPB?
LM2577T-15/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2577T-15/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 LM2577T-15/NOPB?
For technical support, including LM2577T-15/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2577T-15/NOPB requirements.
6.How does Aetrix verify that LM2577T-15/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2577T-15/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 LM2577T-15/NOPB meets industry standards.
7.What is the process for return or replacement of LM2577T-15/NOPB?
All LM2577T-15/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2577T-15/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 LM2577T-15/NOPB part is unused and in its original packaging.
Return procedure for LM2577T-15/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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