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Texas Instruments LM2590HVT-3.3/NOPB
- Part No.:
- LM2590HVT-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2590HVT-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO220-7
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2590HVT-3.3/NOPB from Texas Instruments is a monolithic 1-A, 150-kHz non-synchronous step-down (buck) DC-DC converter with fixed 3.3-V output, 4.5–60 V input range, and ±4% output voltage tolerance over line/load/temperature. It integrates internal frequency compensation, thermal shutdown, current limiting, and an error flag for power-good monitoring in industrial power supplies and embedded systems.
For engineers reviewing the LM2590HVT-3.3/NOPB datasheet, LM2590HVT-3.3/NOPB pinout, LM2590HVT-3.3/NOPB application, or LM2590HVT-3.3/NOPB equivalent, key selection criteria include its 60-V max input rating, 90 µA standby current in shutdown mode, programmable soft-start via SD/SS pin, delay-controlled flag assertion, and TO-220 package compatibility with heatsink mounting for 1-A continuous operation.
Technical Context
The LM2590HVT-3.3/NOPB implements a fixed-frequency PWM buck topology with internal 150-kHz oscillator, integrated 1.3-A peak-current-limited NPN switch, and voltage-mode control using a 1.23-V reference. Its feedback loop is internally connected to the output for fixed-voltage operation, eliminating external resistor dividers.
It features dual-stage current limiting (1.3 A typical peak, 2.8 A max), thermal shutdown at 150°C junction temperature, and a dedicated open-collector Flag pin that asserts low ≤1 V when output drops below 95% of nominal - with programmable delay via external capacitor on Pin 5 to avoid false triggers during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over –40°C to +125°C, 4.5–60 V input, 0.2–1 A load - ensures stable logic rail generation without trimming. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact 33–68 µH inductors and reduces EMI compared to lower-frequency alternatives. |
| Max Input Voltage | 60 V - supports wide-input industrial, automotive, and telecom applications including 48-V bus regulation. |
| Output Current | 1 A DC continuous - sufficient for powering microcontrollers, FPGAs, and peripheral ICs without external boost stages. |
| Standby Current | 90 µA typical at VIN = 60 V in shutdown - minimizes battery drain in always-on systems with remote enable control. |
| Efficiency | 77% typical at VIN = 12 V, IOUT = 1 A - balances thermal performance and conversion loss in cost-sensitive designs. |
| Thermal Resistance | RθJA = 50°C/W (TO-220, 1 in² copper) - requires minimal heatsinking for full-load operation at ambient ≤75°C. |
Pinout & Package
LM2590HVT-3.3/NOPB is supplied in a 7-pin TO-220 package (NDZ variant) with tab-connected VIN for direct heatsink mounting. The package measures 14.99 mm × 10.16 mm and supports vertical PCB mounting with lead bending options.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts 4.5–60 V unregulated DC; connects to heatsink tab; requires ≥330 µF bulk input capacitance for stability. |
| 2 - Output | Internal NPN switch collector | Drives external catch diode and inductor; swings between ~VIN–0.95 V and –0.5 V; peak current limited to 2.8 A. |
| 3 - Flag | Open-collector error indicator | Asserts low ≤1 V when VOUT < 3.135 V (95% of 3.3 V); sinks up to 3 mA; requires external pull-up resistor (e.g., 4.7 kΩ). |
| 4 - GND | Circuit ground reference | Common return for internal bias, feedback, and power paths; must be low-impedance connection to minimize noise coupling. |
| 5 - Delay | Flag delay timing node | Charged by 3 µA internal current source; Flag goes high after capacitor voltage exceeds 1.25 V - sets power-good delay. |
| 6 - Feedback | Regulation sense input | Internally tied to output for fixed 3.3-V version; not user-accessible - eliminates external resistor divider errors and layout sensitivity. |
| 7 - SD/SS | Shutdown/Soft-start control | Drives low ≤0.6 V for 90 µA shutdown; floats or ≥2 V for active operation; 5 µA/1.6 µA current sources enable soft-start ramp control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150-kHz oscillator | Eliminates external timing components and simplifies EMI filtering - enables predictable ripple frequency and layout repeatability. |
| Programmable soft-start | Capacitor on SD/SS pin controls output voltage ramp rate - prevents inrush current into large output capacitors (e.g., 220 µF). |
| Power-good flag with delay | Delay pin (Pin 5) allows configurable hold-off before Flag asserts high - avoids false undervoltage warnings during transient load steps. |
| Two-stage current limit | First stage limits peak switch current to ~1.3 A; second stage reduces switching frequency under overload - protects MOSFET and inductor. |
| Thermal shutdown protection | Halts switching at 150°C junction temperature and resumes only after cooldown - prevents permanent damage in sealed enclosures. |
| Low-quiescent-current shutdown | Draws only 90 µA at 60 V input in shutdown - extends battery life in portable equipment with wake-on-event architectures. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24-V vehicle battery or 48-V industrial bus to clean 3.3-V logic supply for microcontrollers and sensors. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 3.3-V rail with input transients up to ±60 V and cold-crank immunity down to 4.5 V. Use Value: Maintains 3.3-V output within ±4% across –40°C to +125°C ambient, enabling reliable operation in engine compartments and factory floors. |
Use Scenario: Powering CAN transceivers, LIN interfaces, and EEPROMs in door modules, seat controllers, and lighting ECUs. IC Role / Device Role / Timing Role: Local point-of-load regulator with integrated error flag for system-level power sequencing and fault reporting. Use Value: Flag pin provides hardware-level "power good" signal to MCU reset controller, eliminating need for external supervisor ICs. |
| Telecom Remote Radio Unit | Programmable Logic Controller I/O Module |
|
Use Scenario: Stepping down 48-V PoE-derived or base station DC supply to 3.3-V FPGA core voltage in outdoor wireless units. IC Role / Device Role / Timing Role: High-input-voltage buck converter with thermal shutdown and current limiting for unattended, fanless deployments. Use Value: 60-V absolute maximum input rating withstands lightning-induced surges and long cable drop compensation without derating. |
Use Scenario: Generating isolated 3.3-V auxiliary supply for digital I/O conditioning circuits and ADC reference buffers in modular PLC backplanes. IC Role / Device Role / Timing Role: Secondary regulator downstream of isolation DC-DC, providing low-noise, tightly regulated rail for precision analog front-ends. Use Value: 77% efficiency at 12-V input minimizes heat buildup in densely packed DIN-rail enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2590T-3.3 | Same architecture but rated for 40-V max input (vs. 60 V); no HV suffix; RθJA = 65°C/W (higher thermal resistance). | Suitable only for ≤40-V input systems (e.g., 24-V industrial); less robust against transients and cold-crank events. | Select LM2590T-3.3 only if input never exceeds 40 V and thermal margin is sufficient with available copper area. |
| LM2596HV-3.3 | Higher 3-A output capability; same 60-V input; 150-kHz frequency; but larger TO-220-5 package (no Flag/Delay pins). | Lacks power-good flag and delay functionality - requires external supervisor for sequencing or fault detection. | Choose LM2596HV-3.3 when higher current (>1 A) is needed and Flag functionality is handled elsewhere in the system. |
Compared with LM2590T-3.3, LM2590HVT-3.3/NOPB delivers superior surge immunity and thermal performance; versus LM2596HV-3.3, it trades current headroom for integrated supervision - making it optimal for space-constrained 1-A designs requiring autonomous power-good signaling.
Availability
LM2590HVT-3.3/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and telecom remote radio units requiring stable component supply with long-term lifecycle support.
Supply support for LM2590HVT-3.3/NOPB 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 technologies, with decades of expertise in high-reliability DC-DC conversion.
The LM2590HV product line was designed specifically for ruggedized step-down regulation in harsh environments - targeting applications where wide input range, integrated protection, and supervisory features reduce bill-of-materials count and improve system-level robustness.
FAQ
What is the maximum input voltage rating for LM2590HVT-3.3/NOPB?
The LM2590HVT-3.3/NOPB has an absolute maximum input voltage rating of 63 V, with recommended operating range from 4.5 V to 60 V. This 60-V upper limit enables direct regulation from 48-V telecom buses and automotive 24-V systems with cold-crank headroom. Exceeding 60 V risks permanent damage even with transient suppression.
Does LM2590HVT-3.3/NOPB require external feedback resistors?
No, LM2590HVT-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, its internal feedback network is permanently configured for 3.3 V - Pin 6 (Feedback) is internally connected to the output. This eliminates resistor tolerance errors and layout sensitivity associated with adjustable versions.
How is the power-good flag (Flag pin) used in LM2590HVT-3.3/NOPB?
The Flag pin on LM2590HVT-3.3/NOPB is an open-collector output that pulls low (≤1 V) when output voltage falls below 95% of 3.3 V (i.e., <3.135 V). It requires an external pull-up resistor (e.g., 4.7 kΩ to 3.3 V or 5 V) and can sink up to 3 mA. Its assertion is delayed via capacitor on Pin 5 to prevent false triggers during startup.
Can LM2590HVT-3.3/NOPB operate without a heatsink?
LM2590HVT-3.3/NOPB can operate without an external heatsink at full 1-A load only with ≥1 in² of 1-oz copper on the PCB connected to the VIN tab, at ambient temperatures ≤75°C. At higher loads or ambient temperatures, thermal shutdown will activate unless a heatsink is added - the TO-220 tab is electrically connected to VIN and serves as primary thermal path.
What is the purpose of the Delay pin (Pin 5) on LM2590HVT-3.3/NOPB?
The Delay pin (Pin 5) on LM2590HVT-3.3/NOPB sets the time interval between output regulation and Flag pin assertion. An internal 3 µA current source charges an external capacitor; when voltage reaches 1.25 V, Flag goes high. This prevents premature "power good" signals during output overshoot or slow-rising loads - critical for sequenced power systems.
LM2590HVT-3.3/NOPB 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-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2590HVT-3.3/NOPB FAQ
1.How can I place an order for LM2590HVT-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2590HVT-3.3/NOPB 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 LM2590HVT-3.3/NOPB reliable?
The price and inventory of LM2590HVT-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2590HVT-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2590HVT-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2590HVT-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2590HVT-3.3/NOPB?
LM2590HVT-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2590HVT-3.3/NOPB 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 LM2590HVT-3.3/NOPB?
For technical support, including LM2590HVT-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2590HVT-3.3/NOPB requirements.
6.How does Aetrix verify that LM2590HVT-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2590HVT-3.3/NOPB 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 LM2590HVT-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2590HVT-3.3/NOPB?
All LM2590HVT-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2590HVT-3.3/NOPB, 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 LM2590HVT-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2590HVT-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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