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Texas Instruments LM2591HVS-3.3/NOPB
- Part No.:
- LM2591HVS-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2591HVS-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:102
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Product details
Overview
LM2591HVS-3.3/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous buck DC-DC converter delivering up to 1 A at fixed 3.3 V output, with input voltage range up to 60 V, ±4% output voltage tolerance over line/load/temperature, and 77% efficiency at 12 VIN/1 A. It serves as a high-efficiency primary step-down regulator in industrial power supplies and automotive subsystems.
For engineers reviewing the LM2591HVS-3.3/NOPB datasheet, LM2591HVS-3.3/NOPB pinout, LM2591HVS-3.3/NOPB application, or LM2591HVS-3.3/NOPB equivalent, key selection criteria include its 60-V max input rating, 90-μA standby current in shutdown mode, thermal shutdown protection, fixed-frequency operation enabling predictable EMI filtering, and compatibility with standard TO-220 and DDPAK-5 PCB footprints.
Technical Context
The LM2591HVS-3.3/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a single chip. Its 150-kHz fixed oscillator enables use of compact external inductors and capacitors while maintaining stable regulation across −40°C to +125°C ambient temperature.
It operates in continuous conduction mode (CCM) under typical loads and transitions to discontinuous mode (DCM) at light loads. The ON/OFF pin provides logic-level shutdown control with 1.3-V threshold and <200-μA leakage, enabling precise system-level power sequencing without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% (3.168–3.432 V) over full line/load/temperature range - ensures reliable 3.3-V rail compliance for microcontrollers and FPGAs. |
| Input Voltage Range | 4.5 V to 60 V - supports wide-input applications including 24-V industrial buses and 48-V telecom systems without pre-regulation. |
| Max Output Current | 1 A DC - sufficient to power multiple low-power ICs or an entire embedded subsystem from a single regulator. |
| Switching Frequency | 150 kHz (127–173 kHz over temp) - enables use of standard off-the-shelf 47–100 μH inductors and avoids AM radio band interference. |
| Standby Current | 90 μA typical at shutdown - minimizes battery drain in always-on monitoring circuits or wake-on-event systems. |
| Thermal Protection | Internal thermal shutdown at ~150°C junction - prevents catastrophic failure during overload or poor heatsinking conditions. |
| Current Limit | 1.3–2.8 A peak switch current limit - provides robust short-circuit protection while allowing safe inrush into large output capacitors. |
Pinout & Package
LM2591HVS-3.3/NOPB is supplied in a 5-pin TO-220 package (NDH variant), with exposed tab thermally and electrically connected to Pin 3 (Ground). The package measures 14.986 mm × 10.16 mm and supports through-hole mounting with optional heatsink attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: +VIN | Positive input supply | Accepts 4.5–60 V DC; requires local 470-μF low-ESR aluminum electrolytic bypass capacitor to handle high di/dt switching currents. |
| 2: Output | Switch node | Drives external catch diode and inductor; swings between ~(+VIN − 1.2 V) and ~−0.5 V; layout must minimize loop area to reduce EMI. |
| 3: Ground | Power and signal reference | Common return for input/output capacitors, feedback network, and heatsink; must be low-impedance connection to avoid regulation instability. |
| 4: Feedback | Regulation sense input | Internally tied to output for fixed 3.3-V version; monitors output directly-no external resistor divider required. |
| 5: ON/OFF | Shutdown control | Logic-compatible input: ≤0.6 V = active, ≥2 V = shutdown; 90-μA quiescent draw in shutdown; max 25-V absolute rating. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated thermal shutdown | Automatically disables switching above ~150°C junction temperature, preventing damage during sustained overload or inadequate cooling. |
| Two-stage current limiting | First stage limits peak switch current to ~1.3 A (min); second stage reduces switching frequency under severe overload to limit average power dissipation. |
| Fixed 150-kHz oscillator | Enables consistent filter design across production units; eliminates need for external timing components and simplifies EMI compliance testing. |
| Low 90-μA standby current | Supports energy-sensitive applications such as battery-backed sensors or IoT edge nodes requiring multi-year shelf life. |
| ±4% output voltage accuracy | Guaranteed across full operating range (−40°C to +125°C, 4.5–60 VIN, 0.2–1 A load), eliminating need for post-regulation trimming in most designs. |
Applications
| Industrial PLC I/O Module Power | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Provides isolated 3.3-V logic rail for digital I/O expansion cards in programmable logic controllers operating from 24-V DC field bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24-V supply to clean 3.3-V for microcontroller, CAN transceiver, and GPIO buffers. Use Value: Withstands 60-V transients per ISO 7637-2; 1-A output supports simultaneous activation of 8+ digital outputs; thermal shutdown protects against enclosure overheating. |
Use Scenario: Powers 3.3-V domain in body control module handling door locks, lighting, and window lift functions from vehicle battery (9–16 V nominal, up to 40 V load dump). IC Role / Device Role / Timing Role: Main buck converter supplying MCU core voltage and peripheral interfaces; ON/OFF pin synchronized to vehicle ignition state. Use Value: 90-μA shutdown current extends battery life during vehicle sleep mode; 60-V input rating covers load-dump events without external TVS clamping. |
| Telecom Remote Radio Unit (RRU) | Medical Point-of-Care Monitor |
Use Scenario: Generates 3.3-V bias for RF front-end ICs and ADCs in outdoor 48-V-powered remote radio units deployed on cell towers. IC Role / Device Role / Timing Role: Pre-regulator stepping down 48-V backplane to 3.3-V before LDO post-regulation for noise-sensitive analog sections. Use Value: 77% efficiency at 48→3.3 V reduces heat generation in sealed enclosures; 150-kHz switching allows small 68-μH inductor footprint. |
Use Scenario: Supplies 3.3-V logic rail for ARM-based patient monitor mainboard operating from internal Li-ion battery pack (10–12.6 V fully charged). IC Role / Device Role / Timing Role: High-efficiency primary DC-DC converter enabling >8-hour runtime; ON/OFF pin controlled by system power manager. Use Value: 90-μA standby current preserves battery charge during idle periods; ±4% output tolerance ensures reliable boot and sensor interface operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2591HV-3.3/NOPB | Same silicon die; differs only in packaging (TO-220 vs. DDPAK); identical electrical specs and pinout. | No functional difference; TO-220 variant offers easier manual assembly and heatsinking via screw mount. | Select LM2591HVS-3.3/NOPB when through-hole mounting and mechanical robustness are prioritized over board space. |
| LM2596-3.3 | Lower 40-V max input, 150-kHz frequency, but higher 3-A output current; different pinout and thermal characteristics. | Suitable for lower-voltage systems (≤24 V) where higher current or cost sensitivity outweighs 60-V requirement. | Choose LM2596-3.3 only if input never exceeds 40 V and ≥2 A output is needed; not drop-in compatible due to pinout and layout differences. |
Compared with LM2591HV-3.3/NOPB and LM2596-3.3, the LM2591HVS-3.3/NOPB uniquely balances 60-V input capability, 1-A output, TO-220 mechanical reliability, and minimal external component count-making it optimal for ruggedized 24/48-V industrial and automotive power rails where long-term availability and thermal margin are critical.
Availability
LM2591HVS-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply, long-lifecycle support, and traceable sourcing from authorized channels.
Supply support for LM2591HVS-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 power conversion ICs.
The LM2591HV series was designed specifically for rugged, wide-input-voltage step-down applications in harsh environments-emphasizing simplicity, thermal resilience, and minimal external component count for rapid, robust power design.
FAQ
What is the maximum input voltage rating for the LM2591HVS-3.3/NOPB?
The LM2591HVS-3.3/NOPB has an absolute maximum input voltage of 63 V and a recommended operating range of 4.5 V to 60 V. This 60-V upper limit enables direct use in 48-V telecom systems and withstands automotive load-dump transients without external clamping. Exceeding 60 V in normal operation risks violating recommended conditions and may trigger thermal shutdown or reduce lifetime reliability.
Does the LM2591HVS-3.3/NOPB require an external feedback resistor network?
No, the LM2591HVS-3.3/NOPB is a fixed-output variant with internal feedback divider set for 3.3 V. Pin 4 (Feedback) is internally connected to the output, eliminating the need for external resistors. This simplifies layout, improves accuracy by avoiding resistor tolerance errors, and reduces bill-of-materials cost compared to adjustable versions like LM2591HV-ADJ.
How does the ON/OFF pin function on the LM2591HVS-3.3/NOPB?
The ON/OFF pin (Pin 5) controls device enable/disable state: driving it to ≤0.6 V or leaving it floating activates regulation; pulling it to ≥2 V places LM2591HVS-3.3/NOPB in shutdown mode with 90-μA typical quiescent current. The threshold is typically 1.3 V, and the pin tolerates up to 25 V-enabling direct interfacing with microcontroller GPIOs or discrete logic without level shifting.
What thermal performance can be expected from the LM2591HVS-3.3/NOPB in TO-220 package?
In the NDH (TO-220) package, the LM2591HVS-3.3/NOPB has a junction-to-ambient thermal resistance (RθJA) of 50°C/W on a standard 4-layer JEDEC board. With 1-A load at 12 VIN, power dissipation is ~2.3 W; this yields ~115°C junction rise above ambient-well within the 150°C max rating if ambient stays below 35°C or heatsinking is added. Thermal shutdown engages if junction exceeds ~150°C.
Is the LM2591HVS-3.3/NOPB RoHS compliant and lead-free?
Yes, the LM2591HVS-3.3/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix in the part number (NOPB = No Lead, Pb-Free). It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards. Full compliance documentation is available in TI's official product change notices and material declarations.
LM2591HVS-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-5)
LM2591HVS-3.3/NOPB FAQ
1.How can I place an order for LM2591HVS-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2591HVS-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 LM2591HVS-3.3/NOPB reliable?
The price and inventory of LM2591HVS-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 LM2591HVS-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2591HVS-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2591HVS-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2591HVS-3.3/NOPB?
LM2591HVS-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2591HVS-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 LM2591HVS-3.3/NOPB?
For technical support, including LM2591HVS-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2591HVS-3.3/NOPB requirements.
6.How does Aetrix verify that LM2591HVS-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2591HVS-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 LM2591HVS-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2591HVS-3.3/NOPB?
All LM2591HVS-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2591HVS-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 LM2591HVS-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2591HVS-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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