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Texas Instruments LM2588SX-12
- Part No.:
- LM2588SX-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2588SX-12.pdf
- Description:
- IC REG BST FLYBACK 12V 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
LM2588SX-12 from Texas Instruments is a monolithic 5A flyback/boost switching regulator IC with fixed 12V output, integrated 5.0A NPN power switch rated for 65V standoff, wide 4V–40V input range, adjustable 100–200 kHz switching frequency, and external shutdown capability. It delivers up to 1.2A load current in flyback configuration with ±4% system output voltage tolerance over line and load conditions, commonly used in isolated DC-DC power supplies for industrial control systems.
For engineers reviewing the LM2588SX-12 datasheet, LM2588SX-12 pinout, LM2588SX-12 application, or LM2588SX-12 equivalent, key selection considerations include its fixed 12V output architecture, TO-263-7 (KTW) thermally enhanced package, current-mode control for transient response, internal soft-start to limit in-rush current, and compatibility with standard flyback transformers such as Schott 67141450 or Renco RL-5472-5.
Technical Context
The LM2588SX-12 implements current-mode PWM control with an internal error amplifier (transconductance = 0.328 mmho, gain = 70 V/V), reference voltage of 12.0V at feedback pin (±2.4% tolerance), and oscillator frequency set via resistor on Pin 1 (100–200 kHz). Its NPN switch operates with 0.7V saturation voltage at 5.0A and sustains 65V, enabling robust flyback operation across 4V–40V inputs.
Thermal management relies on the KTW package's low θJA of 35°C/W (with 0.4896 in² copper), undervoltage lockout at 3.30V (±0.35V), and thermal shutdown protection. The device draws <60 μA in shutdown and supports frequency synchronization via Pin 6, allowing coordinated multi-regulator operation without beat frequencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.0V (±4% system tolerance over line/load; 11.52–12.48V min/max) |
| Input Voltage Range | 4V to 40V (supports wide industrial supply rails; UVLO activates below 3.30V) |
| Switch Current Rating | 5.0A continuous (NPN transistor; 6.5A current limit threshold) |
| Switch Voltage Rating | 65V standoff (enables safe operation with reflected flyback voltages up to 60V) |
| Switching Frequency | Adjustable 100–200 kHz (set by external resistor on Pin 1; sync-capable via Pin 6) |
| Efficiency | 90% typical (at VIN = 10V, IOUT = 1A in flyback configuration per Figure 19) |
| Shutdown Current | <60 μA (enables ultra-low-power standby in battery-backed systems) |
Pinout & Package
LM2588SX-12 uses the 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad, optimized for high-current flyback applications requiring efficient heat dissipation on PCBs with ≥0.4896 in² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FREQ ADJ | Oscillator frequency programming | Connect external resistor to GND to set switching frequency from 100–200 kHz |
| 2 - GND | Power and signal ground reference | Common return path for switch, error amp, and internal circuits; tied to thermal pad |
| 3 - FEEDBACK | Output voltage sensing input | Monitors regulated 12V output via resistive divider; compares to internal 12V reference |
| 4 - OUTPUT | NPN switch collector | Drives primary winding of flyback transformer; handles up to 5A peak current |
| 5 - INPUT | Main power input | Accepts 4–40V DC input; feeds internal bias and switch driver circuitry |
| 6 - SYNC | Frequency synchronization input | Accepts external clock signal to align switching frequency with other regulators |
| 7 - ON/OFF | External shutdown control | Logic-high (>1.6V) enables operation; logic-low disables switch and reduces quiescent current to <60 μA |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast transient response, inherent cycle-by-cycle current limiting, and stable operation across variable input/output conditions |
| Internal soft-start | 11.0 μA soft-start current ramps compensation pin voltage to prevent output overshoot and in-rush stress on input capacitors |
| Thermal shutdown & current limit | Protects against sustained overload or poor heatsinking by disabling switch when junction temperature exceeds 150°C or peak current exceeds 6.5A |
| Undervoltage lockout (UVLO) | Prevents erratic startup by holding device disabled until input reaches 3.30V (±0.35V), ensuring reliable biasing |
| Reference voltage accuracy | 12.0V feedback reference with ±2.4% total tolerance (11.76–12.24V) ensures tight output regulation without external trimming |
Applications
| Industrial Isolated Power Supply | Automotive Auxiliary DC-DC Converter |
|---|---|
Use Scenario: Providing isolated 12V rail from 24V vehicle battery to power CAN transceivers and microcontrollers in engine control units. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating output via optocoupler feedback; manages transformer energy transfer timing and current limiting. Use Value: Enables compact, high-reliability isolation without external gate drivers or complex control ICs; meets automotive temperature range (−40°C to +125°C junction). |
Use Scenario: Generating stable 12V from variable 8–16V input in railway signaling equipment with EMI-sensitive analog sensors. IC Role / Device Role / Timing Role: Fixed-output flyback regulator operating at 150 kHz to avoid AM radio band; controls duty cycle via current-sense ramp comparison. Use Value: Delivers ±4% output tolerance across full line/load range while maintaining 90% efficiency at 1A, reducing thermal load in sealed enclosures. |
| Programmable Logic Controller (PLC) Power Module | Test Equipment Auxiliary Supply |
Use Scenario: Powering isolated I/O modules in modular PLC backplanes where multiple 12V outputs are derived from a common 24V bus. IC Role / Device Role / Timing Role: Flyback controller driving center-tapped transformer for dual ±12V outputs; synchronized via Pin 6 to suppress inter-channel noise coupling. Use Value: Supports multi-output designs with minimal external components; frequency sync eliminates beat frequencies in densely packed control cabinets. |
Use Scenario: On-board 12V supply for benchtop oscilloscope auxiliary peripherals requiring low-noise, fast transient response. IC Role / Device Role / Timing Role: Boost regulator stepping up 5V USB-derived input to regulated 12V; uses current-mode control to reject input ripple. Use Value: Achieves 90% efficiency at 1A with <100 mVpp output ripple (AC-coupled), meeting test-grade power integrity requirements. |
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-12 | TO-220-7 (NDZ) package; higher θJA = 65°C/W (no heatsink); identical electrical specs | Better suited for prototyping or low-volume through-hole assembly; requires external heatsink for >0.8A continuous loads | Select LM2588T-12 if board layout constraints favor through-hole mounting or thermal mass is added externally. |
| LM2577-12 | Lower 3A switch rating; fixed 52 kHz frequency; no frequency sync or soft-start; 40V max input | Targeted at cost-sensitive, lower-power flyback designs; lacks programmability and advanced protection features | Choose LM2577-12 only for legacy designs or where 3A output and fixed frequency are acceptable trade-offs for BOM cost reduction. |
Compared with LM2588T-12 and LM2577-12, the LM2588SX-12 offers superior thermal performance in surface-mount layouts, precise 100–200 kHz frequency control for EMI optimization, and integrated soft-start-making it optimal for production-ready, space-constrained industrial power modules requiring reliability and design flexibility.
Availability
LM2588SX-12 is available at Aetrix Electronics and suitable for industrial automation, railway signaling, and test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing for safety-critical power subsystems.
Supply support for LM2588SX-12 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-current flyback and boost converter applications in industrial, automotive, and telecom infrastructure-emphasizing simplicity, thermal robustness, and minimal external component count.
FAQ
What is the maximum output current achievable with LM2588SX-12 in a flyback configuration?
The LM2588SX-12 supports up to 1.2A output current in flyback topology under specified conditions (VIN = 4–10V, TJ ≤ +125°C, with adequate PCB copper area). This limit arises from thermal constraints-not switch current capacity-as the internal 5.0A NPN switch remains within safe operating area. Derating is required above ambient temperatures of 50°C or with reduced copper area.
Does LM2588SX-12 require an external feedback resistor network?
No. The LM2588SX-12 is a fixed-output variant with internal 12.0V reference connected directly to the feedback pin; no external resistor divider is needed. Unlike the LM2588-ADJ version, it integrates the voltage-setting network internally, simplifying design and improving regulation accuracy to ±4% over line and load.
Can LM2588SX-12 be used in boost topology, and what are the key layout considerations?
Yes, LM2588SX-12 supports boost operation per Figure 47 in the datasheet. Critical layout practices include minimizing loop area of the input capacitor–inductor–switch path, using low-ESR output capacitors (≥680 μF), and routing the feedback trace away from noisy switch nodes to maintain regulation stability and reduce EMI.
What is the purpose of the FREQ ADJ pin (Pin 1) on LM2588SX-12, and how is it configured?
The FREQ ADJ pin sets oscillator frequency from 100–200 kHz via an external resistor to GND. For LM2588SX-12, a 22 kΩ resistor yields 200 kHz (max), while open-circuit defaults to ~100 kHz (min). This pin must not be left floating in production designs; TI recommends a pull-down resistor or direct GND tie for fixed-frequency operation.
How does the ON/OFF pin (Pin 7) function, and what voltage thresholds enable/disable LM2588SX-12?
The ON/OFF pin enables or disables the LM2588SX-12 via logic-level control. Device operates when Pin 7 voltage exceeds 1.6V (typical turn-on threshold, 1.0–2.2V min/max); it shuts down drawing <60 μA when voltage falls below 0.8V (typical turn-off threshold, 0.8–1.0V min/max). A series resistor limits current to <75 μA during transition.
LM2588SX-12 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):
- 12V
- 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-12 FAQ
1.How can I place an order for LM2588SX-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2588SX-12 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-12 reliable?
The price and inventory of LM2588SX-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2588SX-12 is usually 5 days.
3.What payment methods are accepted for LM2588SX-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2588SX-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2588SX-12?
LM2588SX-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2588SX-12 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-12?
For technical support, including LM2588SX-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2588SX-12 requirements.
6.How does Aetrix verify that LM2588SX-12 is sourced from the original manufacturer or authorized distributors?
All LM2588SX-12 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-12 meets industry standards.
7.What is the process for return or replacement of LM2588SX-12?
All LM2588SX-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2588SX-12, 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-12 part is unused and in its original packaging.
Return procedure for LM2588SX-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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