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Texas Instruments LM2577M-15
- Part No.:
- LM2577M-15
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2577M-15.pdf
- Description:
- IC REG BST FLYBACK 15V 3A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,420
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Product details
Overview
LM2577M-15 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 LM2577M-15 datasheet, LM2577M-15 pinout, LM2577M-15 application, or LM2577M-15 equivalent, key selection considerations include its fixed 15 V output accuracy (±3.3% over temperature), TO-263-5 (S) package thermal performance (θJA = 37°C/W with 1 in² copper), and compatibility with standard flyback inductors such as AIE L415-0930.
Technical Context
The LM2577M-15 implements current-mode PWM control using an internal error amplifier with 15 V reference voltage, transconductance of 300 μmho (min), and voltage gain of 40 V/V (min). Its 52 kHz fixed-frequency oscillator drives an NPN output switch rated for 65 V standoff and 3.0 A continuous current, with soft-start reducing in-rush current during startup.
It supports boost, flyback, and forward converter topologies. The feedback pin connects directly to output for fixed-voltage versions, eliminating external resistor dividers. Protection features include thermal shutdown, undervoltage lockout (2.7–3.15 V threshold), and internal current limiting-though external inductor selection must ensure peak switch current stays ≤6.0 A per absolute ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15.0 V ±3.3% (14.25–15.75 V) across 100–600 mA load and −40°C to +125°C junction range |
| Input Voltage Range | 3.5 V to 40 V DC-supports wide-input industrial and automotive battery systems without pre-regulation |
| Switch Current Rating | 3.0 A continuous (6.0 A absolute max)-requires external inductor and diode sizing to limit peak current below 6.0 A |
| Oscillator Frequency | 52 kHz ±8% (42–62 kHz)-fixed frequency enables predictable EMI filtering and eliminates timing component count |
| Reference Voltage | 15.0 V at feedback pin-enables direct output-to-feedback connection; line regulation ≤10 mV over 3.5–40 V input |
| Thermal Resistance | θJA = 37°C/W with 1 in² PCB copper-critical for thermal design in enclosed industrial enclosures |
| Protection Features | Undervoltage lockout (2.7–3.15 V), thermal shutdown, and current limiting-prevents damage during fault conditions |
Pinout & Package
LM2577M-15 uses the 5-lead TO-263 (S) surface-mount package (NS package code TS5B), with exposed metal tab for thermal dissipation. 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).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Supply | Accepts 3.5–40 V DC; powers internal circuitry and supplies energy to inductor during switch-on phase |
| 2 (GND) | Power & Signal Reference | Common return path for internal bias, error amp, and switch emitter; must be low-impedance PCB plane |
| 3 (FB) | Feedback Input | Connected directly to VOUT for fixed 15 V operation; senses output to regulate via internal 15 V reference |
| 4 (SW) | NPN Collector Output | Drives external inductor; switches at 52 kHz; requires Schottky or fast-recovery diode to VOUT |
| 5 (VOUT) | Regulated Output | Delivers regulated 15 V to load; connects to FB pin and output capacitor (680 μF/20 V typical) |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.0 A NPN switch | Eliminates need for external transistor and drive circuitry; reduces BOM count and layout complexity |
| Current-mode PWM control | Improves transient response and line/load regulation; enables stable operation with minimal output capacitance |
| 52 kHz fixed-frequency oscillator | Removes external timing components; simplifies EMI filter design and ensures consistent switching behavior |
| Soft-start function | Reduces in-rush current during startup-prevents input rail sag and protects input capacitors and source |
| Thermal shutdown & UVLO | Automatically disables regulator under overtemperature or low-input conditions-ensures system-level reliability |
Applications
| Industrial Sensor Power Supply | Portable Test Equipment |
|---|---|
|
Use Scenario: Powers 15 V analog front-ends (e.g., op-amps, ADCs) in DIN-rail mounted condition monitoring sensors operating from 12 V nominal battery or rail. IC Role / Device Role / Timing Role: Step-up regulator converting 9–16 V input to stable 15 V output; provides isolated, low-noise supply independent of input fluctuations. Use Value: Delivers 600 mA at ±3.3% regulation with <50 mV load/line regulation-ensures precision signal chain accuracy without external LDO post-regulation. |
Use Scenario: Supplies 15 V to handheld multimeters and portable oscilloscope modules powered by 2-cell Li-ion (6–8.4 V) packs. IC Role / Device Role / Timing Role: Primary DC-DC boost stage enabling single-battery operation; integrates soft-start to prevent display flicker during power-on. Use Value: 52 kHz switching allows compact 4.7 μH inductor and ceramic input/output caps-reducing board area by >40% vs. lower-frequency alternatives. |
| Telecom Line Card Bias | Legacy Industrial Control I/O |
|
Use Scenario: Generates 15 V bias for RS-485 transceivers and optocoupler drivers on telecom line cards with 3.3 V or 5 V backplane supplies. IC Role / Device Role / Timing Role: Compact, high-efficiency boost converter replacing discrete transistor-based designs; operates across full industrial temperature range. Use Value: θJA = 37°C/W with 1 in² copper enables 100% load at +70°C ambient-eliminates need for heatsinks in dense card layouts. |
Use Scenario: Replaces aging linear regulators in PLC I/O modules requiring 15 V for analog output stages (e.g., 4–20 mA drivers) fed from 24 V DC rails. IC Role / Device Role / Timing Role: Efficient step-down-from-boost solution where 24 V input is converted to 15 V via buck-boost topology using LM2577M-15 in flyback configuration. Use Value: Integrated current limiting and thermal shutdown provide robustness against short-circuit faults-reducing field failure rates in unattended installations. |
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 | TO-220-5 through-hole package; higher θJA = 65°C/W; identical electrical specs and pinout | Suitable for prototyping or low-volume assemblies where manual soldering or socketing is preferred | Select LM2577T-15 when thermal budget allows higher junction rise or when through-hole assembly is required. |
| LM2577S-15 | Same TO-263-5 (S) package as LM2577M-15; identical thermal and electrical specifications; alternate ordering designation | No functional difference-TI lists both part numbers for same device; LM2577S-15 is documented in SNOS658C as valid orderable variant | LM2577S-15 is a direct form-fit-function match; use when sourcing channels list S-suffix instead of M-suffix. |
Compared with LM2577T-15 and LM2577S-15, the LM2577M-15 offers identical regulation performance and protection but is optimized for automated SMT production with its M-suffix marking and tape-and-reel packaging-enabling higher throughput and tighter thermal management than the T-package, while matching the S-package's footprint and thermal capability.
Availability
LM2577M-15 is available at Aetrix Electronics and suitable for industrial sensor power supplies, portable test equipment, telecom line card bias, and legacy industrial control I/O requiring stable component supply and long-term manufacturability.
Supply support for LM2577M-15 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 industrial-grade reliability.
The LM2577 family was designed specifically for cost-sensitive, high-reliability DC-DC conversion in industrial, instrumentation, and telecom infrastructure-emphasizing simplicity, thermal robustness, and minimal external component count.
FAQ
What is the output voltage tolerance of the LM2577M-15 over temperature and load?
The LM2577M-15 delivers 15.0 V output with guaranteed minimum/maximum limits of 14.25 V and 15.75 V across −40°C to +125°C junction temperature and 100 mA to 600 mA load current. This ±3.3% tolerance is specified in the Electrical Characteristics table for LM2577-15 and applies directly to the LM2577M-15 variant.
Can the LM2577M-15 be used in flyback or forward converter topologies?
Yes, the LM2577M-15 supports flyback and forward converter configurations per its official description and Application Hints section. Its current-mode control, 65 V switch rating, and integrated protection make it suitable for isolated designs-though transformer selection and snubber design must follow TI's recommended practices in SNOS658C.
What is the maximum allowable peak switch current for the LM2577M-15?
The LM2577M-15 has an absolute maximum switch current rating of 6.0 A, but its continuous rating is 3.0 A. To avoid damage, external component selection-including inductor saturation current and diode surge rating-must ensure peak switch current remains ≤6.0 A, especially under startup or overload conditions.
Does the LM2577M-15 require external compensation components?
No, the LM2577M-15 does not require external compensation. Its internal error amplifier and current-mode architecture provide inherent stability with standard external components (inductor, diode, input/output capacitors). TI's reference designs (e.g., Figure 9) confirm stable operation without added RC networks on the COMP pin.
How does the thermal performance of the LM2577M-15 compare to the TO-220 version?
The LM2577M-15 in TO-263-5 package achieves θJA = 37°C/W with 1 in² PCB copper, significantly better than the LM2577T-15's θJA = 65°C/W. This 43% lower thermal resistance allows higher continuous power delivery in space-constrained or thermally demanding environments without additional heatsinking.
LM2577M-15 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- 24-SOIC
LM2577M-15 FAQ
1.How can I place an order for LM2577M-15 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2577M-15 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 LM2577M-15 reliable?
The price and inventory of LM2577M-15 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2577M-15 is usually 5 days.
3.What payment methods are accepted for LM2577M-15?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2577M-15 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2577M-15?
LM2577M-15 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2577M-15 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 LM2577M-15?
For technical support, including LM2577M-15 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2577M-15 requirements.
6.How does Aetrix verify that LM2577M-15 is sourced from the original manufacturer or authorized distributors?
All LM2577M-15 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 LM2577M-15 meets industry standards.
7.What is the process for return or replacement of LM2577M-15?
All LM2577M-15 units undergo pre-shipment inspection (PSI). If there is an issue with LM2577M-15, 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 LM2577M-15 part is unused and in its original packaging.
Return procedure for LM2577M-15:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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