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Texas Instruments LM2577S-15/NOPB
- Part No.:
- LM2577S-15/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2577S-15/NOPB.pdf
- Description:
- IC REG BST FLYBACK 15V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:4,899
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Product details
Overview
LM2577S-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 requiring regulated 15 V rails.
For engineers reviewing the LM2577S-15/NOPB datasheet, LM2577S-15/NOPB pinout, LM2577S-15/NOPB application, or LM2577S-15/NOPB equivalent, key selection criteria include its TO-263-5 surface-mount package, fixed-output topology, 15 V ±3% regulation over temperature and load, and compatibility with standard flyback inductors like AIE L415-0930.
Technical Context
The LM2577S-15/NOPB implements current-mode PWM control using an internal error amplifier comparing feedback voltage against a trimmed 15 V reference, with transconductance of 300 μmho and open-loop gain of 65 V/V. Its 52 kHz fixed-frequency oscillator drives the NPN switch directly, enabling predictable EMI behavior and simplified filter design.
Protection circuitry includes undervoltage lockout (2.7–3.15 V threshold), thermal shutdown at 150°C junction temperature, and peak switch current limiting (3.0 A typical, 3.7–6.0 A min–max). The device requires no external compensation for basic boost operation and supports soft-start via internal 5.0 μA current source into the compensation pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15.0 V ±3% over 100–600 mA load and −40°C to +125°C junction range |
| Input Voltage Range | 3.5 V to 40 V DC-supports wide-range battery and industrial bus inputs |
| Switch Current Rating | 3.0 A continuous NPN switch-limits peak inductor current to prevent saturation in boost topologies |
| Oscillator Frequency | 52 kHz ±8%-enables compact magnetics and predictable ripple frequency without external timing components |
| Efficiency | ≥80% at VIN = 5 V, ILOAD = 600 mA-reduces thermal load in space-constrained PCB layouts |
| Thermal Resistance θJA | 37°C/W with ≥1 in² copper pour-validates thermal performance in TO-263 surface-mount applications |
| UVLO Threshold | 2.9 V nominal (2.7–3.15 V range)-prevents erratic startup during brownout or low-battery conditions |
Pinout & Package
LM2577S-15/NOPB uses a 5-pin TO-263 (S) surface-mount package with exposed thermal pad. Pin 1 is Input (VIN), Pin 2 is Ground (GND), Pin 3 is Feedback (FB), Pin 4 is Output Switch (SW), and Pin 5 is Output (VOUT). The thermal pad must be soldered to a minimum 1 in² copper area for rated θJA = 37°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 3.5–40 V DC; connects to bulk input capacitor and current-limiting fuse |
| 2 (GND) | Power & Signal Reference | Common return for input, output, and internal circuits; must tie to low-impedance ground plane |
| 3 (FB) | Feedback Input | Internally connected to 15 V reference; tied directly to VOUT in fixed-output configuration |
| 4 (SW) | Switch Collector | Drives external boost diode and inductor; switches at 52 kHz with 0.5–0.9 V saturation |
| 5 (VOUT) | Regulated Output | Delivers 15 V to load; requires ≥680 μF low-ESR electrolytic capacitor per TI test circuit |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.0 A NPN switch | Eliminates need for external transistor and drive circuitry in boost/flyback designs |
| Current-mode PWM control | Provides inherent line/load transient rejection and simplifies loop compensation |
| 52 kHz fixed-frequency oscillator | Enables consistent EMI filtering and eliminates external timing resistor/capacitor |
| Soft-start function | Reduces inrush current by ramping internal duty cycle-prevents input rail collapse at startup |
| Comprehensive protection suite | Includes UVLO, thermal shutdown, and current limiting-ensures robust operation under fault conditions |
Applications
| Industrial Sensor Power Supply | Portable Test Equipment |
|---|---|
Use Scenario: Powers 15 V analog front-end circuits in field-deployable pressure/temperature sensors operating from 4–24 V DC industrial buses. IC Role / Device Role / Timing Role: Step-up regulator generating stable 15 V rail from variable input; provides isolated, low-noise supply for precision op-amps and ADCs. Use Value: Maintains ±3% output regulation across 3.5–40 V input range and −40°C to +85°C ambient-ensuring measurement accuracy without recalibration. |
Use Scenario: Supplies 15 V to LCD backlight drivers and microcontroller peripherals in handheld multimeters and oscilloscopes powered by 2×AA or Li-ion batteries. IC Role / Device Role / Timing Role: Boost converter extending battery life by efficiently stepping up 3–4.2 V to fixed 15 V output. Use Value: Delivers ≥80% efficiency at 600 mA load and integrates soft-start-eliminating display flicker and MCU reset during battery insertion. |
| Automotive Aftermarket Modules | Legacy Industrial Control I/O |
Use Scenario: Generates 15 V for CAN transceiver bias and microcontroller logic in vehicle diagnostic tools connecting to 12 V automotive battery (9–16 V nominal, ±20% transient). IC Role / Device Role / Timing Role: Wide-input boost regulator providing fault-tolerant 15 V supply despite cold-crank and load-dump events. Use Value: UVLO (2.7–3.15 V) prevents malfunction during cranking; 65 V switch standoff withstands ISO 7637-2 pulse 5a transients. |
Use Scenario: Replaces aging linear regulators in PLC analog output modules requiring 15 V for op-amp driver stages and DAC references. IC Role / Device Role / Timing Role: High-current switching regulator replacing inefficient 7815 linear ICs-reducing board-level heat and enabling higher channel density. Use Value: 3.0 A switch supports multiple 15 V loads simultaneously; TO-263 package allows direct replacement on legacy through-hole footprints with minimal layout change. |
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-15/NOPB | TO-220-5 through-hole package; higher θJA = 65°C/W; identical electrical specs | Preferred for prototyping, heatsink-mounting, or legacy through-hole boards | Select when mechanical mounting or manual assembly outweighs surface-mount density requirements |
| LM2577M-15/NOPB | 24-pin surface-mount SOIC package; lower max switch current (2.5 A); same 15 V output | Suitable for lower-power applications (<400 mA) where footprint size is critical | Choose only if load current ≤400 mA and PCB real estate constraints prohibit TO-263 use |
Compared with LM2577T-15/NOPB, LM2577S-15/NOPB offers superior thermal performance (37 vs. 65°C/W) in surface-mount layouts, while LM2577M-15/NOPB trades current capability for smaller footprint-making LM2577S-15/NOPB the optimal balance of power, thermal management, and manufacturability for production SMT designs.
Availability
LM2577S-15/NOPB is available at Aetrix Electronics and suitable for industrial sensor power supplies, portable test equipment, automotive diagnostic modules, and legacy industrial control I/O requiring stable component supply and long-term lifecycle support.
Supply support for LM2577S-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 and embedded processing technologies, with decades of expertise in power management ICs and high-reliability industrial components.
The LM2577 family was designed specifically for cost-sensitive, high-efficiency DC-DC conversion in industrial, automotive, and instrumentation applications-emphasizing simplicity, ruggedness, and minimal external component count.
FAQ
What is the maximum output current supported by LM2577S-15/NOPB?
The LM2577S-15/NOPB supports up to 600 mA of continuous output current under typical conditions (VIN = 5 V, TJ ≤125°C, with adequate PCB copper area). This limit arises from thermal constraints and the 3.0 A NPN switch's safe operating area-not from regulation accuracy. At higher ambient temperatures or reduced copper area, derating is required. The LM2577S-15/NOPB datasheet specifies 600 mA as the maximum tested load for guaranteed 15 V output regulation.
Does LM2577S-15/NOPB require external compensation components?
No, LM2577S-15/NOPB does not require external compensation components for standard boost configurations. Its internal error amplifier and current-mode control architecture provide inherent stability with the recommended external components (inductor, diode, input/output capacitors). Compensation is only needed for non-standard topologies (e.g., flyback with optocoupler feedback) or when optimizing transient response beyond default performance.
Can LM2577S-15/NOPB operate from a 3.3 V input source?
No, LM2577S-15/NOPB cannot reliably operate from a 3.3 V input. Its absolute minimum input voltage is 3.5 V, and undervoltage lockout activates below 2.7 V. At 3.3 V, the device remains disabled. For 3.3 V input applications, consider the adjustable version LM2577S-ADJ/NOPB with appropriate feedback resistors-or alternative boost ICs rated for lower VIN.
What is the purpose of the Feedback (FB) pin on LM2577S-15/NOPB?
On LM2577S-15/NOPB, the Feedback (FB) pin is internally connected to the 15 V reference and must be tied directly to the VOUT pin to close the regulation loop. Unlike the adjustable version, no external resistive divider is used. This internal connection ensures fixed 15 V output and eliminates feedback network errors-simplifying design and improving long-term stability.
How does the soft-start function in LM2577S-15/NOPB reduce in-rush current?
The LM2577S-15/NOPB implements soft-start by sourcing a constant 5.0 μA current into the compensation (COMP) pin, gradually charging its internal capacitor and ramping the PWM duty cycle from zero to full over ~10 ms. This controlled rise limits peak inductor current during startup, preventing input capacitor discharge spikes and avoiding tripping upstream fuses or causing system brownouts-critical in battery-powered or shared-rail applications.
LM2577S-15/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2577S-15/NOPB FAQ
1.How can I place an order for LM2577S-15/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2577S-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 LM2577S-15/NOPB reliable?
The price and inventory of LM2577S-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 LM2577S-15/NOPB is usually 5 days.
3.What payment methods are accepted for LM2577S-15/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2577S-15/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2577S-15/NOPB?
LM2577S-15/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2577S-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 LM2577S-15/NOPB?
For technical support, including LM2577S-15/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2577S-15/NOPB requirements.
6.How does Aetrix verify that LM2577S-15/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2577S-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 LM2577S-15/NOPB meets industry standards.
7.What is the process for return or replacement of LM2577S-15/NOPB?
All LM2577S-15/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2577S-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 LM2577S-15/NOPB part is unused and in its original packaging.
Return procedure for LM2577S-15/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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