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Texas Instruments LM2588SX-ADJ
- Part No.:
- LM2588SX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2588SX-ADJ.pdf
- Description:
- IC REG BST FLYBACK ADJ 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,829
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Product details
Overview
LM2588SX-ADJ from Texas Instruments is a monolithic 5A NPN-switch flyback and boost regulator IC with adjustable output voltage, 4V–40V input range, 100–200 kHz switching frequency, and internal soft-start. It operates in current-mode control for stable regulation in industrial power supplies requiring isolated or step-up DC/DC conversion.
For engineers reviewing the LM2588SX-ADJ datasheet, LM2588SX-ADJ pinout, LM2588SX-ADJ application, or LM2588SX-ADJ equivalent, this page delivers verified technical context, real-world design parameters, package-specific thermal data, and validated alternative options - all grounded in TI's SNVS117D revision April 2013 specification.
Technical Context
The LM2588SX-ADJ implements current-mode PWM control with an internal 1.230 V ±1.5 mV reference, error amplifier (AVOL = 670 V/V, GM = 3.2 mmho), and oscillator synchronized via Pin 1. Its NPN switch sustains 65 V and delivers up to 5 A peak current with cycle-by-cycle limiting.
Thermal management relies on external PCB copper area: θJA ranges from 35°C/W (KTW package, 3.6× copper) to 56°C/W (KTW, minimal copper). Undervoltage lockout triggers at 3.3 V (3.05–3.75 V), and shutdown draws <60 μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Adjustable via external resistor divider; set point determined by 1.230 V reference at FB pin |
| Input Voltage Range | 4 V to 40 V - supports wide-range industrial inputs including 12 V, 24 V, and 36 V rails |
| Switch Current Limit | 5.0 A typical - defines maximum primary-side energy transfer in flyback or inductor current in boost |
| Switching Frequency | 100–200 kHz - adjustable via resistor on Pin 1; higher frequencies reduce magnetics size but increase losses |
| Reference Voltage | 1.230 V ±0.022 V (min/max over temp) - sets output accuracy baseline for feedback network design |
| Efficiency | 90% typical at 10 VIN, 1 A load (flyback config) - enables thermally constrained board-level designs |
| Shutdown Current | <60 μA - enables low-power standby modes without auxiliary LDOs or external switches |
Pinout & Package
LM2588SX-ADJ is supplied in the KTW (TO-263-7) surface-mount package: 7-pin, exposed thermal pad, RoHS-compliant, with θJA = 35°C/W when mounted on ≥0.4896 in² (3.6× package area) of 1 oz. copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FREQ) | Oscillator frequency adjust/sync input | Resistor-to-ground sets frequency; external clock signal synchronizes multiple regulators |
| 2 (GND) | Power and signal ground reference | Common return for switch, error amp, and internal circuits; must connect to thermal pad |
| 3 (FB) | Feedback input | Compares divided output voltage against 1.230 V reference to regulate output |
| 4 (COMP) | Error amplifier output | Drives compensation network; source/sink capability up to ±260 μA |
| 5 (VIN) | Main power input | Supplies internal circuitry and switch base drive; accepts 4–40 V with UVLO at ~3.3 V |
| 6 (SW) | Switch collector output | Connects to transformer primary or boost inductor; withstands 65 V, conducts up to 5 A |
| 7 (SH) | Shutdown control input | Logic-low (<0.8 V) disables switch; draws ≤75 μA when active high |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode operation | Enables fast transient response and inherent cycle-by-cycle current limiting without external sensing |
| Internal soft-start | 11 μA constant-current ramp on COMP pin limits inrush during startup, reducing stress on input capacitors |
| Frequency synchronization | Allows precise phase alignment of multiple LM2588SX-ADJ units to minimize EMI peaks and input ripple |
| Thermal shutdown protection | Triggers at 150°C junction temperature, preventing damage under overload or poor heatsinking |
| Wide input voltage range | Supports direct connection to unregulated 12 V, 24 V, or 36 V battery or rectified AC supplies |
Applications
| Industrial Flyback Power Supply | Automotive Boost Converter |
|---|---|
|
Use Scenario: Isolated 12 V/1 A output from 18–36 V vehicle battery rail in telematics control unit. IC Role / Device Role / Timing Role: Primary-side controller regulating flyback transformer with optocoupler feedback loop. Use Value: Achieves ±4% output tolerance across line/load while maintaining 90% efficiency and meeting automotive thermal constraints. |
Use Scenario: Generating stable 12 V from variable 5–9 V USB-PD or PoE-derived input in network edge device. IC Role / Device Role / Timing Role: Step-up DC/DC controller driving external Schottky diode and 15 μH inductor. Use Value: Delivers regulated output without external current sense, leveraging internal 5 A NPN switch and 1.230 V reference. |
| Multi-Output Telecom PSU | Programmable Lab Power Module |
|
Use Scenario: Triple-output (±12 V, +5 V) flyback supply for analog front-end in base station transceiver. IC Role / Device Role / Timing Role: Single-controller solution managing cross-regulated outputs via auxiliary winding feedback. Use Value: Reduces BOM count vs. multi-IC approach; maintains tight coupling between outputs using transformer turns ratio. |
Use Scenario: Bench power supply with digitally adjustable 1.23–24 V output using DAC-controlled feedback divider. IC Role / Device Role / Timing Role: Adjustable-voltage regulator core enabling precision output programming via FB pin voltage scaling. Use Value: Enables 0.1% reference stability and <100 mV load/line regulation - critical for calibration-grade instrumentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback and boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2577SX-ADJ | Lower 3 A switch current, fixed 52 kHz frequency, no sync pin, no soft-start | Suitable for lower-power flyback (≤15 W); lacks frequency adjustment and synchronization capability | Select when cost sensitivity outweighs need for adjustable frequency or multi-phase sync |
| UCC38C43DG4 | Current-mode PWM controller only - requires external MOSFET, no integrated switch or reference | Used in higher-efficiency discrete flyback designs where thermal design flexibility is prioritized | Select when >5 A output current, custom topology, or discrete FET optimization is required |
Compared with LM2588SX-ADJ, LM2577SX-ADJ offers lower integration and reduced feature set but lower system cost, while UCC38C43DG4 provides full design freedom at the expense of increased component count and layout complexity.
Availability
LM2588SX-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC/DC converters, telecom infrastructure equipment, and programmable lab instruments requiring stable component supply and long-term manufacturability.
Supply support for LM2588SX-ADJ 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 LM2588 family was engineered specifically for cost-sensitive, medium-power flyback and boost applications requiring minimal external components and robust thermal performance in industrial and transportation environments.
FAQ
What is the minimum recommended output voltage for LM2588SX-ADJ?
The LM2588SX-ADJ has a 1.230 V internal reference voltage at the FB pin. With standard resistor-divider design practices and accounting for reference tolerance (±0.022 V), the practical minimum output voltage is approximately 1.25 V. Lower outputs require precision resistors and careful layout to maintain regulation accuracy, as stated in the SNVS117D datasheet Section "LM2588-ADJ Electrical Characteristics".
Can LM2588SX-ADJ be used in forward converter topologies?
No - the LM2588SX-ADJ is explicitly designed and characterized for flyback and boost configurations only. Its internal NPN switch, current-sense architecture, and timing control lack the reset-winding interface and duty-cycle constraints required for safe forward converter operation. TI's datasheet lists only flyback, boost, and multiple-output flyback as valid topologies.
What is the maximum allowable duty cycle for LM2588SX-ADJ?
The LM2588SX-ADJ supports a maximum duty cycle of 98%, as specified in the "All Output Voltage Versions Electrical Characteristics" table (DMAX = 98% typical, 90% min). This limit applies across the full operating temperature range and ensures reliable current-mode control loop stability in both flyback and boost modes.
How does the LM2588SX-ADJ handle short-circuit conditions?
Under short-circuit, the LM2588SX-ADJ reduces switching frequency to 25 kHz (fSC) to limit power dissipation while maintaining current limiting. The internal current limit remains active (5.0 A typical), and thermal shutdown engages if junction temperature exceeds 150°C. Recovery is automatic once fault clears and temperature drops below hysteresis threshold.
Is the LM2588SX-ADJ RoHS compliant and halogen-free?
Yes - the LM2588SX-ADJ (KTW package) meets RoHS Directive 2011/65/EU and is halogen-free per TI's product compliance documentation. The TO-263-7 package uses lead-free matte tin plating and complies with JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) when stored per standard handling guidelines.
LM2588SX-ADJ 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 60V
- 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-ADJ FAQ
1.How can I place an order for LM2588SX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2588SX-ADJ 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-ADJ reliable?
The price and inventory of LM2588SX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2588SX-ADJ is usually 5 days.
3.What payment methods are accepted for LM2588SX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2588SX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2588SX-ADJ?
LM2588SX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2588SX-ADJ 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-ADJ?
For technical support, including LM2588SX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2588SX-ADJ requirements.
6.How does Aetrix verify that LM2588SX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2588SX-ADJ 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-ADJ meets industry standards.
7.What is the process for return or replacement of LM2588SX-ADJ?
All LM2588SX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2588SX-ADJ, 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-ADJ part is unused and in its original packaging.
Return procedure for LM2588SX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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