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Texas Instruments LM2588SX-5.0
- Part No.:
- LM2588SX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2588SX-5.0.pdf
- Description:
- IC REG BOOST FLYBACK 5V 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,403
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Product details
Overview
LM2588SX-5.0 from Texas Instruments is a monolithic 5A flyback/boost regulator IC with integrated 5.0A NPN switch, 5.0V fixed output, 4V–40V input range, and adjustable 100–200 kHz switching frequency-designed for isolated DC-DC conversion in industrial power supplies and telecom line cards.
For engineers reviewing the LM2588SX-5.0 datasheet, LM2588SX-5.0 pinout, LM2588SX-5.0 application, or LM2588SX-5.0 equivalent, key selection criteria include output voltage tolerance (±4% max), shutdown current (<60 μA), thermal shutdown protection, current-mode control for transient response, and compatibility with standard flyback transformers such as Schott 67141450.
Technical Context
The LM2588SX-5.0 implements current-mode PWM control with an internal error amplifier (transconductance = 0.750 mmho, gain = 165 V/V), oscillator synchronized via Pin 1, and soft-start function driven by 11.0 μA internal current source. It operates in flyback or boost topologies using external transformer or inductor.
Protection includes cycle-by-cycle current limiting, undervoltage lockout (3.30 V threshold), thermal shutdown (150°C junction limit), and switch sustaining voltage rating of 65V. The device requires no external feedback resistor network due to its fixed 5.0V output configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±4% over line/load/temperature - ensures stable rail for logic or analog circuitry without post-regulation |
| Input Voltage Range | 4 V to 40 V - supports wide-range industrial inputs including 12 V, 24 V, and 36 V bus systems |
| Switch Current Rating | 5.0 A continuous - enables up to ~1.45 A output at 5 V in flyback mode with typical efficiency ≥80% |
| Switching Frequency | 100–200 kHz adjustable - balances EMI control, transformer size, and efficiency in compact designs |
| Shutdown Current | <60 μA - minimizes standby power loss in battery-backed or energy-sensitive applications |
| Reference Voltage | 5.0 V at FB pin - eliminates external divider, simplifying layout and improving accuracy vs. adjustable variants |
| Thermal Shutdown | 150°C junction - protects against overload or poor heatsinking in enclosed enclosures |
Pinout & Package
LM2588SX-5.0 is housed in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad, optimized for high-power density and thermal performance on PCBs with ≥0.4896 in² copper area (θJA = 35°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC/ON-OFF) | Oscillator sync / shutdown control | Accepts external clock (≤200 kHz) or TTL-level shutdown signal; threshold = 1.6 V |
| 2 (GND) | Power and signal ground reference | Common return for internal circuits, switch emitter, and compensation network |
| 3 (FB) | Feedback input | Internally connected to 5.0 V reference; no external resistors required |
| 4 (COMP) | Error amplifier output | Drives external RC compensation network to stabilize loop response |
| 5 (VIN) | Main input supply | Accepts 4–40 V DC; powers internal bias and gate drive circuits |
| 6 (SW) | Switch collector output | Connects to primary winding of flyback transformer or boost inductor |
| 7 (VOUT) | Internal reference output | Provides regulated 5.0 V for external circuitry (e.g., optocoupler bias); not load-switched |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0A NPN power switch | Eliminates need for external transistor and driver, reducing BOM count and layout complexity |
| Current-mode PWM control | Enables fast transient response and inherent cycle-by-cycle current limiting without sense resistor |
| Internal soft-start | Reduces inrush current during startup by ramping peak switch current via 11.0 μA COMP-source current |
| Frequency synchronization | Allows multiple LM2588SX-5.0 units to operate at identical switching frequency, easing EMI filtering |
| System-level ±4% output tolerance | Guarantees regulation across full operating temperature (−40°C to +125°C) and load range |
Applications
| Industrial Flyback Power Supply | Telecom Line Card Boost Converter |
|---|---|
|
Use Scenario: Isolated 5 V/1.4 A output from 24 V DC input in DIN-rail mounted PLC I/O module. IC Role / Device Role / Timing Role: Primary-side controller managing transformer energy transfer, feedback regulation, and fault protection. Use Value: Enables single-chip isolation with <60 μA shutdown current and built-in thermal shutdown-reducing system-level safety margin requirements. |
Use Scenario: Generating 5 V rail from 3.3 V backplane in legacy telecom shelf with space constraints. IC Role / Device Role / Timing Role: Step-up regulator controlling inductor current to maintain regulated 5 V output under dynamic load steps. Use Value: Delivers >80% efficiency at 750 mA load with 100–200 kHz programmable frequency-minimizing filter component size. |
| Dual-Output Telecom Adapter | Automotive Body Control Module |
|
Use Scenario: Dual-output (5 V/1.2 A and −12 V/0.3 A) flyback supply for optical transceiver interface board. IC Role / Device Role / Timing Role: Master controller regulating main output while enabling cross-regulation of auxiliary winding. Use Value: Supports standard transformer T2 (Schott 67140860) with fixed 5 V output-eliminating feedback divider errors in multi-rail designs. |
Use Scenario: 5 V supply for microcontroller and CAN transceiver in 12 V vehicle battery environment with cold-crank immunity. IC Role / Device Role / Timing Role: Input-robust regulator maintaining regulation down to 4 V input during cranking events. Use Value: Wide 4–40 V input range and undervoltage lockout (3.30 V) ensure reliable operation across automotive battery transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2588T-5.0 | TO-220 (NDZ) through-hole package; higher θJA = 65°C/W (no heatsink) | Better suited for prototyping or low-volume assemblies requiring manual soldering | Select when mechanical mounting or thermal mass favors through-hole over SMT |
| LM2577-5.0 | Lower 3A switch rating; fixed 50 kHz frequency; no sync/shutdown pins | Limited to lower-power flyback or boost where 1A output suffices | Choose only if cost sensitivity outweighs need for 5A capability, frequency tuning, or shutdown control |
Compared with LM2588T-5.0 and LM2577-5.0, the LM2588SX-5.0 offers superior thermal performance in SMT layouts, precise frequency control for EMI management, and active shutdown-making it optimal for production-grade, high-reliability flyback converters.
Availability
LM2588SX-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, telecom adapters, automotive body control modules, and isolated sensor interfaces requiring stable component supply and long-term manufacturability.
Supply support for LM2588SX-5.0 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 IC design and manufacturing.
The LM2588 series was developed specifically for cost-effective, high-efficiency isolated and non-isolated DC-DC conversion in industrial, telecom, and automotive applications-emphasizing minimal external components and robust protection.
FAQ
What topology does the LM2588SX-5.0 support?
The LM2588SX-5.0 supports flyback, forward, and step-up (boost) converter topologies. Its internal 5.0A NPN switch and current-mode control architecture are optimized for flyback designs using standard transformers like Schott 67141450, but it also functions reliably in boost configurations with external inductors such as Renco RL-5472-5. The LM2588SX-5.0 does not support buck or SEPIC topologies.
Does the LM2588SX-5.0 require external feedback resistors?
No. The LM2588SX-5.0 integrates a precision 5.0V reference directly at the FB pin, eliminating the need for external resistor dividers. This simplifies layout, improves output accuracy (±4% over line/load/temperature), and avoids drift from resistor tolerance or temperature coefficients. The LM2588SX-5.0 is functionally distinct from the adjustable LM2588-ADJ, which requires external R1/R2 networks.
What is the maximum output current achievable with the LM2588SX-5.0?
In flyback configuration, the LM2588SX-5.0 delivers up to 1.45 A at 5.0 V with VIN = 12 V and typical efficiency ≥80%, as specified in the Electrical Characteristics table. Output current is limited by transformer design, thermal management, and duty cycle-not solely by the 5.0A internal switch. In boost mode, external current limiting must be implemented since output current is not internally regulated.
How does the LM2588SX-5.0 handle thermal overload?
The LM2588SX-5.0 incorporates thermal shutdown that activates at 150°C junction temperature, disabling the internal NPN switch until temperature falls below the hysteresis threshold. This protection is independent of current limiting and works in conjunction with internal current-limit (6.5 A typical) and undervoltage lockout (3.30 V). For sustained operation, PCB copper area ≥0.4896 in² is recommended to maintain θJA ≤35°C/W.
Can the LM2588SX-5.0 synchronize to an external clock?
Yes. The LM2588SX-5.0 supports frequency synchronization via Pin 1 (SYNC/ON-OFF). When driven with a clean square wave ≤200 kHz and amplitude ≥0.75 V, the internal oscillator locks to the external signal-enabling phase-aligned operation across multiple regulators to reduce conducted EMI peaks. This feature is unavailable on legacy regulators like LM2577-5.0 and is confirmed in the LM2588SX-5.0 datasheet Figure 17 and Electrical Characteristics table.
LM2588SX-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- 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):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5A (Switch)
- Frequency - Switching:
- 100kHz ~ 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2588SX-5.0 FAQ
1.How can I place an order for LM2588SX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2588SX-5.0 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 LM2588SX-5.0 reliable?
The price and inventory of LM2588SX-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2588SX-5.0 is usually 5 days.
3.What payment methods are accepted for LM2588SX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2588SX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2588SX-5.0?
LM2588SX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2588SX-5.0 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 LM2588SX-5.0?
For technical support, including LM2588SX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2588SX-5.0 requirements.
6.How does Aetrix verify that LM2588SX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2588SX-5.0 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 LM2588SX-5.0 meets industry standards.
7.What is the process for return or replacement of LM2588SX-5.0?
All LM2588SX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2588SX-5.0, 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 LM2588SX-5.0 part is unused and in its original packaging.
Return procedure for LM2588SX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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