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Texas Instruments LM2588S-12
- Part No.:
- LM2588S-12
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2588S-12.pdf
- Description:
- IC REG BST FLYBACK 12V 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,774
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Product details
Overview
LM2588S-12 from Texas Instruments is a monolithic 5A flyback/boost switching regulator IC with fixed 12V output, integrated 65V NPN power switch, 4V–40V input range, adjustable 100–200 kHz switching frequency, and external shutdown capability-designed for isolated DC-DC conversion in industrial power supplies.
For engineers reviewing the LM2588S-12 datasheet, LM2588S-12 pinout, LM2588S-12 application, or LM2588S-12 equivalent, key selection considerations include its 12V ±4% output tolerance over line/load, 90% efficiency at 10VIN/1A, thermal shutdown protection, current-mode control for transient immunity, and TO-263-7 (KTW) package compatibility with high-power flyback layouts.
Technical Context
The LM2588S-12 implements current-mode PWM control with an internal error amplifier (VREF = 12.0V, ±0.48V), transconductance of 0.328 mmho, and voltage gain of 70 V/V. Its oscillator supports synchronization and resistor-programmable frequency up to 200 kHz.
It integrates undervoltage lockout (3.30V threshold), soft-start (11 μA charging current), and cycle-by-cycle current limiting. The 5A NPN switch sustains 65V, exhibits 0.7V saturation voltage at 5A, and draws only 16 μA shutdown supply current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12.0V ±4% over full line/load/temperature range-ensures stable rail for downstream logic or analog circuitry without external feedback resistors. |
| Input Voltage Range | 4V to 40V-supports wide-input industrial, automotive, and telecom power buses including 12V and 24V nominal systems. |
| Switch Current Rating | 5.0A continuous, 6.5A peak limit-enables ≥1.2A output in flyback mode with proper transformer design and thermal management. |
| Switching Frequency | 100–200 kHz, adjustable via resistor or synchronizable-balances EMI, magnetics size, and efficiency for compact isolated designs. |
| Efficiency | 90% typical at 10VIN, 1A load-reduces thermal stress and enables convection-cooled operation in space-constrained enclosures. |
| Shutdown Current | <60 μA-minimizes standby power in battery-backed or energy-sensitive applications. |
| Thermal Resistance | θJA = 35°C/W (with 3.6× copper area)-validates use on standard PCBs without heatsinks under ≤2.5W dissipation. |
Pinout & Package
LM2588S-12 is housed in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad-optimized for high-current flyback/boost converters requiring low thermal resistance and mechanical robustness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Oscillator synchronization input | Accepts external clock signal (0.75V threshold) to align switching frequency across multiple regulators-critical for noise-sensitive multi-rail systems. |
| 2 (GND) | Power and signal ground reference | Common return path for switch, error amp, and bias circuits-must be connected to low-impedance PCB ground plane beneath thermal pad. |
| 3 (FEEDBACK) | Voltage feedback input | Monitors output via resistive divider; internally compared to 12.0V reference-fixed-output version ties this pin directly to output in flyback configuration. |
| 4 (COMP) | Error amplifier output | Drives compensation network (RC); 2.8V max swing enables stable loop compensation for varying transformer leakage and load dynamics. |
| 5 (SWITCH) | NPN collector output | Connects to primary winding of flyback transformer or boost inductor-handles 5A peak current and 65V off-state voltage. |
| 6 (VIN) | Input supply voltage | Accepts 4–40V unregulated DC; includes undervoltage lockout (3.3V) to prevent erratic startup during brownout conditions. |
| 7 (ON/OFF) | External enable/shutdown control | Logic-level input (1.6V threshold); pulls device into ultra-low-power state (<60 μA) when driven low-enables system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A/65V NPN switch | Eliminates need for external MOSFET and gate driver-reduces BOM count and layout complexity in flyback/boost topologies. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting, fast transient response to load steps, and improved line regulation vs. voltage-mode alternatives. |
| Internal soft-start | 11 μA constant-current ramp on COMP pin limits inrush current during startup-prevents transformer saturation and output overshoot. |
| Frequency synchronization | Enables precise phase alignment of multiple LM2588S-12 devices-essential for reducing conducted EMI in multi-output power systems. |
| ±4% system output tolerance | Guaranteed over full temperature, line, and load range-meets tight regulation requirements for analog sensors, ADC references, and communication interfaces. |
Applications
| Industrial Flyback Power Supply | Automotive Boost Converter |
|---|---|
|
Use Scenario: Isolated 12V auxiliary rail generation from 24V vehicle battery in infotainment head units. IC Role / Device Role / Timing Role: Primary-side controller managing transformer energy transfer, regulating output via optocoupler feedback, and providing overcurrent/thermal protection. Use Value: Enables compact, cost-effective isolation without external high-voltage gate drivers-meets AEC-Q100 transient immunity requirements when paired with appropriate input filtering. |
Use Scenario: Boosting 5V USB-C PD source to 12V for powering legacy peripherals in mobile workstations. IC Role / Device Role / Timing Role: Step-up regulator controlling inductor current to maintain regulated 12V output under dynamic load changes up to 1A. Use Value: Delivers 90% efficiency at 10VIN/1A, minimizing heat buildup in thermally constrained portable enclosures while supporting programmable frequency for EMI tuning. |
| Telecom Wall Adapter | Programmable Lab Power Module |
|
Use Scenario: Universal-input (90–264V AC) offline flyback adapter delivering 12V/1.2A for networking equipment. IC Role / Device Role / Timing Role: Regulator IC operating in discontinuous conduction mode (DCM), interfacing with bridge rectifier, bulk capacitor, and transformer secondary rectification. Use Value: Fixed 12V output eliminates feedback resistor calibration-reducing manufacturing test time and improving long-term stability versus adjustable alternatives. |
Use Scenario: Bench power supply module with selectable 12V output and remote ON/OFF control via microcontroller GPIO. IC Role / Device Role / Timing Role: Core switching regulator enabling precise enable/disable sequencing, soft-start ramp control, and synchronization to system clock for noise reduction. Use Value: External shutdown pin (Pin 7) allows clean power cycling without output droop; SYNC pin enables multi-channel coherence in multi-output lab instruments. |
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 | Identical electrical specs but in TO-220-7 (NDZ) package-higher θJA (45°C/W vs. 35°C/W) and through-hole mounting. | Preferred for prototyping or low-volume assemblies where manual soldering or socketing is required; less suitable for high-density SMT production. | Select LM2588T-12 only if board assembly process does not support TO-263 reflow or thermal pad soldering is impractical. |
| LM2577-12 | Lower 3A switch rating, fixed 52 kHz frequency, no SYNC or soft-start-lacks current-mode control and external frequency adjustment. | Suitable for cost-sensitive, lower-power (≤0.5A) non-isolated boost applications where EMI and transient response are less critical. | Choose LM2577-12 only for simple, low-complexity boost designs below 0.5A; avoid for flyback or high-precision 12V regulation. |
Compared with LM2588T-12 and LM2577-12, the LM2588S-12 delivers superior thermal performance in SMT layouts, synchronized multi-device operation, and tighter output regulation-making it optimal for production-grade isolated 12V supplies demanding reliability and design flexibility.
Availability
LM2588S-12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC modules, telecom adapters, and programmable lab equipment requiring stable component supply and long-term manufacturability.
Supply support for LM2588S-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, embedded processing, and power management ICs-with decades of expertise in high-reliability switching regulator design.
The LM2588 series was engineered specifically for cost-effective, low-component-count flyback and boost converters in industrial, automotive, and telecom infrastructure-emphasizing integration, thermal robustness, and ease of application.
FAQ
What is the maximum output current achievable with LM2588S-12 in a flyback configuration?
The LM2588S-12 supports up to 1.2A output current in flyback mode under specified conditions (VIN = 4–10V, TJ ≤ 125°C), as confirmed by its LM2588-12 Electrical Characteristics table. This assumes proper transformer selection (e.g., Renco RL-5534), adequate PCB copper area (≥0.4896 in²), and adherence to thermal derating curves. Output current is internally limited in flyback topology per TI documentation.
Does LM2588S-12 require an external feedback resistor network?
No-LM2588S-12 is a fixed-output variant with internal 12.0V reference; the FEEDBACK pin connects directly to the regulated output in standard flyback configurations. Unlike the LM2588-ADJ, it does not use external resistors to set VOUT, eliminating calibration drift and reducing component count.
Can LM2588S-12 be used in boost topology, and what are the key layout considerations?
Yes, LM2588S-12 is explicitly validated for boost operation per Figure 47 and "Typical Boost Regulator Applications" in the datasheet. Critical layout practices include minimizing SW node loop area, placing input capacitor close to VIN/GND pins, using Kelvin connection for feedback, and ensuring solid thermal pad soldering to reduce θJA to 35°C/W.
What is the purpose of the SYNC pin on LM2588S-12, and how is it implemented?
The SYNC pin (Pin 1) accepts an external clock signal to synchronize the internal oscillator-enabling phase-aligned operation of multiple LM2588S-12 devices. It triggers at 0.75V threshold with 100 μA input current, allowing direct connection to CMOS logic or dedicated sync generators without level-shifting circuitry.
How does the thermal performance of LM2588S-12 compare between KTW and NDZ packages?
LM2588S-12 in KTW (TO-263-7) achieves θJA = 35°C/W with 3.6× copper area, while LM2588T-12 in NDZ (TO-220-7) achieves 45°C/W under identical conditions. The KTW package's exposed thermal pad and SMT mounting provide superior heat transfer-critical for sustained 5A switch operation in compact industrial power supplies.
LM2588S-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- 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)
LM2588S-12 FAQ
1.How can I place an order for LM2588S-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2588S-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 LM2588S-12 reliable?
The price and inventory of LM2588S-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2588S-12 is usually 5 days.
3.What payment methods are accepted for LM2588S-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2588S-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2588S-12?
LM2588S-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2588S-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 LM2588S-12?
For technical support, including LM2588S-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2588S-12 requirements.
6.How does Aetrix verify that LM2588S-12 is sourced from the original manufacturer or authorized distributors?
All LM2588S-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 LM2588S-12 meets industry standards.
7.What is the process for return or replacement of LM2588S-12?
All LM2588S-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2588S-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 LM2588S-12 part is unused and in its original packaging.
Return procedure for LM2588S-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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