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Texas Instruments LM2588T-3.3
- Part No.:
- LM2588T-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2588T-3.3.pdf
- Description:
- IC REG BST FLYBACK 3.3V TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:4,772
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Product details
Overview
LM2588T-3.3 from Texas Instruments is a monolithic 5A flyback/boost switching regulator IC with fixed 3.3V output, integrated 5.0A NPN switch rated for 65V standoff, wide 4V–40V input range, adjustable 100–200kHz switching frequency, and external shutdown capability. It delivers up to 1.75A load current with ±4% system output voltage tolerance across line and load conditions in industrial power supplies.
For engineers reviewing the LM2588T-3.3 datasheet, LM2588T-3.3 pinout, LM2588T-3.3 application, or LM2588T-3.3 equivalent, key selection criteria include its fixed 3.3V output configuration, TO-220-7 (NDZ) package thermal performance (θJA = 65°C/W), current-mode control architecture, soft-start function, and compatibility with standard flyback transformers like Schott 67141450.
Technical Context
The LM2588T-3.3 implements current-mode PWM control using an internal error amplifier (transconductance = 1.193 mmho, gain = 260 V/V) and comparator that compares the amplified feedback signal against a ramp proportional to switch current. Its oscillator supports frequency adjustment via external resistor or synchronization to external clock signals.
Protection features include cycle-by-cycle current limiting, thermal shutdown, undervoltage lockout (3.3V threshold), and soft-start (11.0 μA startup current). The device operates over −40°C to +125°C junction temperature and draws <60 μA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over full line/load/temperature range - ensures stable logic supply without external feedback resistors. |
| Input Voltage Range | 4V to 40V - supports wide-input industrial, automotive, and telecom power rails including 12V and 24V nominal systems. |
| Switch Current Rating | 5.0A continuous, 6.5A peak - enables high-power flyback or boost topologies with up to ~1.75A output at 3.3V. |
| Switch Voltage Rating | 65V standoff - accommodates reflected transformer voltages and transient spikes in flyback designs. |
| Switching Frequency | Adjustable 100–200 kHz - balances efficiency, magnetics size, and EMI; supports synchronization to avoid beat frequencies. |
| Shutdown Current | <60 μA - minimizes standby power loss in battery-backed or energy-sensitive applications. |
| Thermal Resistance | θJA = 65°C/W (TO-220-7, minimal copper) - defines heatsink requirements for 5A switching under continuous load. |
Pinout & Package
LM2588T-3.3 is housed in a 7-pin TO-220 package (package number NDZ0007B), with the tab electrically connected to Pin 2 (Emitter) and thermally coupled to the PCB for heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Freq Adj / Sync) | Oscillator frequency control or synchronization input | Open-circuit sets fO = 100 kHz; external resistor adjusts up to 200 kHz; accepts TTL-compatible sync signal. |
| 2 (Emitter) | NPN switch emitter terminal | Internally connected to power ground plane; tab is electrically tied to this pin for thermal conduction. |
| 3 (Collector) | NPN switch collector terminal | Connects to primary winding of flyback transformer or inductor in boost configuration; withstands 65V. |
| 4 (Ground) | Analog and power ground reference | Separate from emitter pin; must be star-grounded near compensation and feedback nodes to minimize noise coupling. |
| 5 (Feedback) | Output voltage sensing input | Compares against internal 3.3V reference; no external divider needed for LM2588T-3.3 fixed-output version. |
| 6 (Compensation) | Error amplifier output for loop compensation | Accepts RC network to stabilize control loop; transconductance = 1.193 mmho enables precise pole-zero placement. |
| 7 (ON/OFF) | External shutdown control | Logic-low (<0.8V) disables switching; draws only 40 μA max - compatible with microcontroller GPIO or optocoupler outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A/65V NPN power switch | Eliminates need for external transistor and driver, reducing BOM count and layout complexity in flyback/boost converters. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting, improves line/load transient response, and simplifies loop compensation. |
| Internal soft-start (11 μA current source) | Gradually ramps reference voltage to limit inrush current during startup-critical for capacitor-input rectifier stages. |
| ±4% system output tolerance | Guaranteed over full operating temperature and load range-meets tight regulation requirements for digital logic supplies. |
| External frequency synchronization | Enables multi-regulator systems to operate at identical switching frequencies, reducing beat-frequency EMI and simplifying filtering. |
Applications
| Industrial Flyback Power Supply | Automotive DC-DC Boost Converter |
|---|---|
|
Use Scenario: Isolated 3.3V rail generation from 12V vehicle battery in engine control units, with wide input variation (9–16V) and cold-crank immunity. IC Role / Device Role / Timing Role: Primary-side controller implementing flyback topology with transformer isolation and regulated 3.3V output. Use Value: Delivers stable 3.3V for MCU and sensors without requiring secondary-side feedback; withstands 40V transients per ISO 7637-2. |
Use Scenario: Boosting 5V USB power to 12V for analog front-end circuitry in portable test equipment. IC Role / Device Role / Timing Role: Step-up (boost) regulator controller driving external inductor and diode to generate regulated 12V output. Use Value: Achieves >75% efficiency at 1A load with minimal external components-replaces discrete boost solutions with higher reliability. |
| Telecom Line Card Power | Programmable Logic Controller (PLC) Auxiliary Supply |
|
Use Scenario: Generating isolated 3.3V for FPGA configuration and I/O buffers on telecom line cards powered from −48V DC. IC Role / Device Role / Timing Role: Flyback controller operating from derived +12V rail, providing reinforced isolation and low-noise 3.3V output. Use Value: Meets IEC 60950 creepage/clearance requirements via transformer isolation; ±4% tolerance ensures reliable FPGA boot. |
Use Scenario: Providing auxiliary 3.3V supply for microcontroller and communication interfaces in DIN-rail mounted PLCs with 24V DC input. IC Role / Device Role / Timing Role: Primary-side flyback regulator with external shutdown for safe power sequencing during firmware updates. Use Value: Enables remote ON/OFF control via PLC backplane signal; thermal shutdown protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2588S-3.3 | Same electrical specs but in TO-263-7 (KTW) package with lower θJA = 35°C/W (with 7.4× copper area) - better thermal performance in space-constrained layouts. | Preferred for surface-mount production and higher ambient temperature environments where heatsinking is limited. | Select LM2588S-3.3 when board real estate and thermal management favor SMT over through-hole mounting. |
| LM2577-3.3 | Lower 3A switch rating, fixed 50kHz frequency, no sync capability, and no soft-start - simpler but less flexible and lower power capability. | Suitable for cost-sensitive, low-power flyback designs where 1.5A output suffices and EMI constraints allow fixed frequency. | Choose LM2577-3.3 only for legacy designs or applications where reduced feature set and lower output current are acceptable trade-offs. |
Compared with LM2588S-3.3, the LM2588T-3.3 offers identical regulation and protection but requires through-hole assembly and has higher thermal resistance; versus LM2577-3.3, it provides 67% higher switch current, adjustable frequency, soft-start, and synchronization - enabling more robust, higher-efficiency, and EMI-optimized designs.
Availability
LM2588T-3.3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive DC-DC conversion, and telecom isolated bias rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2588T-3.3 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 belongs to TI's SIMPLE SWITCHER® portfolio, engineered specifically for cost-effective, easy-to-implement flyback, boost, and forward converter applications requiring high integration and robust protection.
FAQ
What is the maximum output current achievable with LM2588T-3.3 in a flyback configuration?
The LM2588T-3.3 supports up to 1.75A output current under specified conditions (VIN = 4–12V, TJ ≤ 125°C), as confirmed in the LM2588-3.3 Electrical Characteristics table. This assumes proper transformer selection (e.g., Schott 67141450), adequate heatsinking (θJA ≤ 65°C/W), and operation within the 4V–40V input range. Exceeding this requires external current limiting or parallel configurations.
Does LM2588T-3.3 require external feedback resistors to set the output voltage?
No. The LM2588T-3.3 is a fixed-output variant with internal feedback divider calibrated for 3.3V regulation. Pin 5 (Feedback) connects directly to the output via a small capacitor for noise filtering - no external resistors are needed, unlike the adjustable LM2588-ADJ version which requires R1/R2 networks.
Can LM2588T-3.3 be synchronized to an external clock signal?
Yes. Pin 1 (Freq Adj / Sync) accepts TTL-compatible synchronization signals up to 200kHz. When driven with a clean square wave, the internal oscillator locks to the external frequency - enabling noise reduction in multi-rail systems and compliance with strict EMI standards.
What is the purpose of the ON/OFF pin (Pin 7) on LM2588T-3.3?
Pin 7 provides logic-level external shutdown: applying a voltage below 0.8V disables switching and reduces supply current to <60 μA. This allows precise power sequencing, fault-based shutdown, or low-power sleep modes - critical in battery-powered or safety-critical systems using LM2588T-3.3.
How does the internal soft-start function operate in LM2588T-3.3?
The LM2588T-3.3 incorporates a dedicated 11.0 μA current source that charges an external capacitor on the Compensation pin (Pin 6) at startup, gradually increasing the error amplifier reference and limiting peak switch current. This prevents inrush into large output capacitors and stabilizes startup in flyback/boost configurations.
LM2588T-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- 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):
- 3.3V
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2588T-3.3 FAQ
1.How can I place an order for LM2588T-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2588T-3.3 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 LM2588T-3.3 reliable?
The price and inventory of LM2588T-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2588T-3.3 is usually 5 days.
3.What payment methods are accepted for LM2588T-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2588T-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2588T-3.3?
LM2588T-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2588T-3.3 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 LM2588T-3.3?
For technical support, including LM2588T-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2588T-3.3 requirements.
6.How does Aetrix verify that LM2588T-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2588T-3.3 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 LM2588T-3.3 meets industry standards.
7.What is the process for return or replacement of LM2588T-3.3?
All LM2588T-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2588T-3.3, 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 LM2588T-3.3 part is unused and in its original packaging.
Return procedure for LM2588T-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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