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Texas Instruments LM2588SX-3.3
- Part No.:
- LM2588SX-3.3
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2588SX-3.3.pdf
- Description:
- IC REG BST FLYBACK 3.3V 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,612
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Product details
Overview
LM2588SX-3.3 from Texas Instruments is a monolithic 5A flyback/boost switching regulator IC with fixed 3.3V 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 1.75A load current with ±4% system output voltage tolerance across line and load conditions in industrial power supplies.
For engineers reviewing the LM2588SX-3.3 datasheet, LM2588SX-3.3 pinout, LM2588SX-3.3 application, or LM2588SX-3.3 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts for flyback and boost topologies.
Technical Context
The LM2588SX-3.3 implements current-mode control with cycle-by-cycle current limiting, internal soft-start (11 μA soft-start current), and an error amplifier featuring 1.193 mmho transconductance and 260 V/V open-loop gain. Its oscillator supports both free-running operation (100–200 kHz via resistor on Pin 1) and synchronization to external clock signals.
Protection includes thermal shutdown, undervoltage lockout (3.3V threshold), and current-limiting circuits safeguarding the 5.0A NPN switch. The device operates over −40°C to +125°C junction temperature and draws less than 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 unregulated 12V/24V systems. |
| Switch Current Rating | 5.0A continuous, 6.5A current limit - enables high-power flyback designs up to ~1.75A at 3.3V output with proper transformer selection. |
| Switch Voltage Rating | 65V standoff - accommodates reflected flyback voltages and transient spikes in isolated DC/DC converters. |
| Switching Frequency | Adjustable 100–200 kHz - balances efficiency vs. magnetics size; higher frequencies reduce transformer volume but increase switching loss. |
| Shutdown Current | <60 μA - enables ultra-low-power standby states in battery-backed or energy-sensitive systems. |
| Thermal Resistance (θJA) | 35°C/W (KTW package, 0.4896 in² copper) - defines heatsinking requirement for 125°C max junction temp at full load. |
Pinout & Package
LM2588SX-3.3 is housed in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad for enhanced heat dissipation. Pin numbering follows standard top-view orientation (Pin 1 = Frequency Adjust / Sync, Pin 7 = Ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Freq Adj / Sync) | Oscillator control input | Resistor-to-ground sets frequency (100–200 kHz); external clock signal synchronizes switching to avoid beat frequencies. |
| Pin 2 (Feedback) | Error amplifier inverting input | Monitors regulated output via internal 3.3V reference; no external divider needed for fixed-output version. |
| Pin 3 (Ground) | Power and signal reference | Common return for internal circuits, switch emitter, and compensation network; requires low-impedance PCB plane. |
| Pin 4 (Compensation) | Error amplifier output | Drives RC network to stabilize loop response; typical 1 MΩ resistor used for gain measurement per datasheet. |
| Pin 5 (Shutdown) | Enable/disable control | Logic-high (>2.2V) enables operation; ≤0.8V disables switch and reduces quiescent current to <60 μA. |
| Pin 6 (Output) | NPN switch collector | Connects to primary winding of flyback transformer or boost inductor; handles 65V transients and 5A peak current. |
| Pin 7 (Emitter) | NPN switch emitter | Internal connection to ground pin (Pin 3); not externally accessible - distinguishes KTW package from through-hole NDZ variant. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5.0A NPN switch with 65V rating | Eliminates need for external high-current transistor and driver, reducing BOM count and layout complexity in flyback/boost designs. |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting, fast transient response to load steps, and improved line/load regulation vs. voltage-mode control. |
| Internal soft-start (11 μA current source) | Controls ramp-up of output voltage during power-on, preventing inrush current damage to input capacitors and downstream circuitry. |
| External frequency synchronization | Enables noise-sensitive applications (e.g., audio, RF systems) to align switching edges and suppress EMI peaks via master clock injection. |
| Thermal shutdown + UVLO + current limit | Provides comprehensive fault protection without external monitoring circuits, enhancing reliability in unattended industrial environments. |
Applications
| Industrial Flyback Power Supply | Automotive Boost Converter |
|---|---|
|
Use Scenario: Isolated 3.3V rail generation from 12V vehicle battery in engine control units with wide cold-crank voltage range (4V–16V). IC Role / Device Role / Timing Role: Primary-side controller implementing flyback topology with transformer isolation, regulating output via primary-side sensing. Use Value: Delivers stable 3.3V for microcontrollers and sensors despite input dips to 4V; 65V switch rating withstands load-dump transients. |
Use Scenario: Generating 3.3V from a partially discharged Li-ion cell (2.7V–4.2V) in portable test equipment requiring low-noise digital supply. IC Role / Device Role / Timing Role: Step-up (boost) regulator controlling inductor current to maintain regulated output above input voltage. Use Value: Enables operation down to 2.7V input while sustaining 1.75A output; adjustable frequency allows EMI tuning to avoid sensitive bands. |
| Telecom Line-Powered Interface | Programmable Logic Controller (PLC) Auxiliary Supply |
|
Use Scenario: Deriving isolated 3.3V for RS-485 transceivers from 48V PoE-like line power in network infrastructure gear. IC Role / Device Role / Timing Role: Flyback controller managing energy transfer across safety-isolated barrier using custom transformer. Use Value: Meets IEC 61000-4-5 surge immunity requirements via 65V switch rating and robust current-mode loop stability. |
Use Scenario: Providing auxiliary 3.3V for FPGA configuration and I/O buffers in DIN-rail mounted PLCs powered by 24V DC field bus. IC Role / Device Role / Timing Role: Fixed-output flyback regulator delivering galvanically isolated supply with ±4% accuracy over temperature. Use Value: Eliminates need for secondary-side feedback optocoupler; internal reference and current-mode control ensure tight regulation without trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar flyback/boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2587SX-3.3 | Same pinout, identical 3.3V fixed output, but limited to 2.5A switch current and 40V max input - lower power capacity. | Suitable only for ≤1A 3.3V flyback designs; cannot replace LM2588SX-3.3 in 1.75A+ applications or >40V input scenarios. | Select when lower cost and reduced thermal demand outweigh need for 5A switch and 65V rating. |
| UCC38C42D | Current-mode PWM controller (not integrated switch); requires external MOSFET; supports up to 1 MHz operation. | Enables higher-efficiency, higher-frequency designs with discrete FETs but increases component count, layout sensitivity, and design effort. | Choose for custom high-efficiency flyback/boost where thermal constraints or EMI targets justify added complexity and validation effort. |
Compared with LM2587SX-3.3, the LM2588SX-3.3 offers 100% higher switch current and 62.5% higher voltage rating - critical for robust industrial flyback designs. Versus UCC38C42D, it trades design flexibility for rapid time-to-market and guaranteed thermal performance in fixed-output applications.
Availability
LM2588SX-3.3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom interface modules, and programmable logic controller auxiliary supplies requiring stable component supply and long-term manufacturability.
Supply support for LM2588SX-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 ICs and high-reliability industrial components.
The LM2588 series was designed specifically for cost-effective, low-component-count flyback and boost converter implementations in harsh-environment applications demanding wide input range and integrated protection.
FAQ
What is the maximum output current achievable with LM2588SX-3.3 in a flyback configuration?
The LM2588SX-3.3 supports up to 1.75A output current under specified conditions (VIN = 4V–12V, TJ ≤ 125°C), as confirmed in the LM2588-3.3 Electrical Characteristics table. This assumes proper transformer selection (e.g., Schott 67141450 for 3.3V single-output), adequate PCB copper area (≥0.4896 in²), and thermal management to maintain junction temperature within limits. Exceeding 1.75A risks thermal shutdown or degraded regulation.
Does LM2588SX-3.3 require external feedback resistors to set the output voltage?
No, LM2588SX-3.3 does not require external feedback resistors. It is a fixed-output variant with internal resistor divider referenced to a precision 3.3V bandgap, as documented in the LM2588-3.3 Electrical Characteristics section. Pin 2 (Feedback) connects directly to the output via a small capacitor for stability - no external divider network is needed, simplifying layout and improving accuracy.
Can LM2588SX-3.3 be synchronized to an external clock signal?
Yes, LM2588SX-3.3 supports external synchronization via Pin 1 (Freq Adj / Sync). When an external clock signal with amplitude ≥0.75V and frequency matching the desired switching rate (100–200 kHz) is applied, the internal oscillator locks to it - enabling noise-sensitive designs to eliminate beat frequencies and concentrate EMI energy at predictable harmonics.
What is the purpose of the Shutdown pin (Pin 5) on LM2588SX-3.3?
The Shutdown pin (Pin 5) on LM2588SX-3.3 provides logic-level enable/disable control: applying ≥2.2V enables normal operation, while ≤0.8V forces the IC into ultra-low-power shutdown mode drawing <60 μA. This feature allows system-level power sequencing, standby mode activation, and fault-induced shutdown - all without requiring external MOSFETs or complex control circuitry.
How does the internal soft-start function of LM2588SX-3.3 improve system reliability?
The LM2588SX-3.3 incorporates an internal soft-start circuit that sources a constant 11.0 μA current into the compensation pin (Pin 4) at startup, gradually ramping the error amplifier output and limiting inrush current. This prevents overstress on input capacitors, avoids output overshoot, and eliminates turn-on transients that could disrupt downstream logic - significantly improving reliability in systems with large bulk capacitance or sensitive loads.
LM2588SX-3.3 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):
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2588SX-3.3 FAQ
1.How can I place an order for LM2588SX-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2588SX-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 LM2588SX-3.3 reliable?
The price and inventory of LM2588SX-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 LM2588SX-3.3 is usually 5 days.
3.What payment methods are accepted for LM2588SX-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2588SX-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2588SX-3.3?
LM2588SX-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2588SX-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 LM2588SX-3.3?
For technical support, including LM2588SX-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2588SX-3.3 requirements.
6.How does Aetrix verify that LM2588SX-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2588SX-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 LM2588SX-3.3 meets industry standards.
7.What is the process for return or replacement of LM2588SX-3.3?
All LM2588SX-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2588SX-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 LM2588SX-3.3 part is unused and in its original packaging.
Return procedure for LM2588SX-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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