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Texas Instruments LM2577T-ADJ/J7002816
- Part No.:
- LM2577T-ADJ/J7002816
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LM2577T-ADJ/J7002816.pdf
- Description:
- IC REG BST FLYBCK ADJ 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,927
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Product details
Overview
LM2577T-ADJ/J7002816 from Texas Instruments is a monolithic step-up (boost) switching voltage regulator IC featuring an integrated 3.0A NPN output switch, 52 kHz fixed-frequency oscillator, current-mode control, and adjustable output voltage via external feedback resistors. It operates from 3.5V to 40V input and delivers regulated outputs up to 60V in boost topology, commonly used in industrial power supplies and battery-powered instrumentation.
For engineers reviewing the LM2577T-ADJ/J7002816 datasheet, LM2577T-ADJ/J7002816 pinout, LM2577T-ADJ/J7002816 application, or LM2577T-ADJ/J7002816 equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative parts for design-in evaluation and BOM optimization.
Technical Context
The LM2577T-ADJ/J7002816 implements current-mode PWM control with internal error amplifier, 1.230 V reference voltage (±1.3% over temperature), and soft-start circuitry that limits in-rush current during startup. Its 52 kHz oscillator enables predictable loop response and simplifies EMI filtering.
It integrates undervoltage lockout (2.70–3.15 V threshold), thermal shutdown, and current limiting (3.7–6.0 A switch current range), with switch saturation voltage of 0.7–0.9 V at 2.0 A. The device supports boost, flyback, and forward converter topologies using minimal external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Topology | Adjustable step-up (boost) regulator - output voltage set externally via resistor divider; supports 1.23 V × (1 + R1/R2) configuration. |
| Input Voltage Range | 3.5 V to 40 V - enables direct operation from 5 V, 12 V, or 24 V rails and compatibility with wide-range industrial inputs. |
| Switch Current Rating | 3.0 A continuous, 6.0 A peak - defines maximum inductor current handling before external current limiting is required in boost mode. |
| Oscillator Frequency | 52 kHz ±8% - fixed frequency simplifies filter design and ensures stable timing without external RC components. |
| Reference Voltage | 1.230 V ±1.3% (min/max over temp) - high-accuracy internal bandgap reference enabling precise output regulation across load and temperature. |
| Thermal Shutdown | Active at TJ ≥150°C - protects die during overload or poor heatsinking; auto-recovery after cooldown. |
| Soft-Start Time | ~10 ms typical - reduces input surge current and output overshoot during power-up, easing system-level stress testing. |
Pinout & Package
LM2577T-ADJ/J7002816 uses the TO-220-5 (T package, Package Number KC), with straight leads and exposed tab electrically connected to Pin 2 (Ground). Thermal resistance θJA = 65°C/W (standard PCB layout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Input | Power input supply connection | Accepts 3.5–40 V DC; requires local 100 μF low-ESR capacitor for stability and transient suppression. |
| 2 - Ground | Power and signal reference node | Internally tied to exposed metal tab; must be soldered to large copper area for thermal management and noise reduction. |
| 3 - Feedback | Regulation sense input | Compares divided output voltage against 1.230 V reference; sets output as VOUT = 1.23 × (1 + R1/R2). |
| 4 - Output | Switch collector terminal | Drives external diode and inductor; switches between VIN and open-circuit; withstands up to 65 V off-state. |
| 5 - On/Off | Enable/disable control input | Logic-high (>2.0 V) enables regulator; logic-low (<1.2 V) disables switch and reduces quiescent current to ~7.5 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.0A NPN switch | Eliminates need for external transistor and driver; reduces board space and component count in compact boost designs. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting, improves line/load transient response, and simplifies loop compensation. |
| 52 kHz fixed-frequency oscillator | Enables consistent EMI profile and predictable inductor sizing; avoids audible noise and eliminates external timing components. |
| Soft-start function | Gradually ramps output voltage over ~10 ms, preventing inrush into downstream capacitors and avoiding brownout on shared rails. |
| Undervoltage lockout (UVLO) | Prevents erratic startup below 2.70 V; ensures clean enable only when input is within valid operating range. |
| Thermal shutdown protection | Shuts down switch at junction temperature ≥150°C; prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Industrial Power Supply | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Generating 24 V from a 12 V lead-acid battery in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Primary boost regulator controlling energy transfer via 52 kHz PWM to maintain stable 24 V output under varying load and battery voltage. Use Value: Enables single-rail battery operation while meeting 24 V sensor/actuator interface requirements without external DC-DC modules. |
Use Scenario: Providing 15 V bias for op-amps and ADCs in portable gas analyzers powered by 3.7 V Li-ion cells. IC Role / Device Role / Timing Role: Adjustable boost converter regulating output via feedback resistors; soft-start prevents sensor rail disturbance during wake-up. Use Value: Delivers precise, low-noise analog supply from low-voltage battery with minimal external parts and no efficiency penalty at light loads. |
| Automotive Aftermarket Lighting | Telecom Line Card Bias |
|
Use Scenario: Driving white LED arrays requiring >30 V from 12 V vehicle electrical system in headlight control units. IC Role / Device Role / Timing Role: High-current boost controller managing 3.0 A switch duty cycle; UVLO prevents flicker during cranking (low-battery dips). Use Value: Sustains LED brightness across 9–16 V input range while maintaining thermal safety margin via integrated shutdown. |
Use Scenario: Generating isolated +12 V and –12 V rails from a 5 V backplane in telecom line cards using flyback topology. IC Role / Device Role / Timing Role: Flyback controller with current-mode feedback; leverages same 52 kHz oscillator and reference for dual-output synchronization. Use Value: Reduces component count vs discrete controllers; enables tight cross-regulation and fast transient recovery on both outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2577S-ADJ/NOPB | Same silicon, DDPAK/TO-263-5 (S package); θJA = 37°C/W with 1 in² copper - lower thermal resistance than TO-220. | Better suited for high-power-density or thermally constrained PCB layouts where heatsinking is limited. | Select LM2577S-ADJ/NOPB when thermal performance is critical and board space allows surface-mount assembly. |
| MC34063AP1G | 3.0 A switch, 100 kHz oscillator, 1.25 V reference; wider input range (3.0–40 V), but higher quiescent current (2.5 mA vs 7.5 mA). | Higher switching frequency enables smaller magnetics but increases EMI sensitivity; less accurate reference (±2% vs ±1.3%). | Choose MC34063AP1G when cost and inductor size are prioritized over precision and thermal efficiency. |
Compared with LM2577T-ADJ/J7002816, LM2577S-ADJ/NOPB offers superior thermal performance in compact layouts, while MC34063AP1G trades reference accuracy and quiescent current for higher frequency and broader vendor support - making each suitable for distinct thermal, precision, or sourcing constraints.
Availability
LM2577T-ADJ/J7002816 is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered instrumentation, and automotive lighting systems requiring stable component supply and long-term manufacturability.
Supply support for LM2577T-ADJ/J7002816 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 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for cost-sensitive, low-component-count DC-DC conversion in industrial, automotive, and consumer applications where robustness and ease of use are essential.
FAQ
What is the minimum input voltage required for stable operation of the LM2577T-ADJ/J7002816?
The LM2577T-ADJ/J7002816 requires a minimum input voltage of 3.5 V to ensure proper internal circuit biasing and undervoltage lockout release. Below this threshold, the device remains disabled; operation at 3.5 V is guaranteed across temperature and load conditions per the datasheet's operating ratings.
Can the LM2577T-ADJ/J7002816 be used in flyback topology, and what design changes are needed?
Yes, the LM2577T-ADJ/J7002816 supports flyback configuration per TI's Application Hints. Key changes include replacing the boost inductor with a flyback transformer, grounding the secondary winding's dot-end, and connecting the feedback network to the regulated secondary output - enabling isolated multiple-output designs.
What is the purpose of the On/Off pin (Pin 5) on the LM2577T-ADJ/J7002816, and how should it be interfaced?
Pin 5 is an active-high enable input: applying ≥2.0 V enables regulation; ≤1.2 V disables the switch and reduces quiescent current to ~7.5 mA. It can be driven directly by microcontroller GPIO or optocoupler output, with no pull-up required - internal biasing ensures defined state during reset.
How does the LM2577T-ADJ/J7002816 handle output short-circuit conditions?
The LM2577T-ADJ/J7002816 relies on its current-limit circuit (3.7–6.0 A) and thermal shutdown (150°C) for short-circuit protection. In sustained short, it cycles between current limit and thermal shutdown - not hiccup mode - so external current limiting or foldback may be needed for reliable fault recovery.
Is the LM2577T-ADJ/J7002816 RoHS-compliant and halogen-free?
Yes, LM2577T-ADJ/J7002816 is RoHS-compliant and halogen-free per Texas Instruments' published environmental compliance documentation (SLMA001), with lead-free matte tin finish on TO-220 leads and compliant packaging materials.
LM2577T-ADJ/J7002816 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0V
- Voltage - Output (Max):
- 60V (Switch)
- Current - Output:
- 3A
- 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-ADJ/J7002816 FAQ
1.How can I place an order for LM2577T-ADJ/J7002816 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2577T-ADJ/J7002816 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-ADJ/J7002816 reliable?
The price and inventory of LM2577T-ADJ/J7002816 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2577T-ADJ/J7002816 is usually 5 days.
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LM2577T-ADJ/J7002816 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2577T-ADJ/J7002816 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-ADJ/J7002816?
For technical support, including LM2577T-ADJ/J7002816 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2577T-ADJ/J7002816 requirements.
6.How does Aetrix verify that LM2577T-ADJ/J7002816 is sourced from the original manufacturer or authorized distributors?
All LM2577T-ADJ/J7002816 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-ADJ/J7002816 meets industry standards.
7.What is the process for return or replacement of LM2577T-ADJ/J7002816?
All LM2577T-ADJ/J7002816 units undergo pre-shipment inspection (PSI). If there is an issue with LM2577T-ADJ/J7002816, 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-ADJ/J7002816 part is unused and in its original packaging.
Return procedure for LM2577T-ADJ/J7002816:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2577T-ADJ/J7002816 Tags
-
TPS562201DDCR
Texas Instruments
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MC34063ABD-TR
STMicroelectronics
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TPS561201DDCR
Texas Instruments
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MC33063ADR
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MC34063ADR
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TPS560200DBVR
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AP3012KTR-G1
Diodes Incorporated
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TLV61048DBVR
Texas Instruments
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AZ34063UMTR-G1
Diodes Incorporated
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TPS562200DDCR
Texas Instruments
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AP62300TWU-7
Diodes Incorporated
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MC34063EBD-TR
STMicroelectronics
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