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Texas Instruments LM2591HVSX-3.3/NOPB
- Part No.:
- LM2591HVSX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2591HVSX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:479
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Product details
Overview
LM2591HVSX-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 90 μA standby current in shutdown mode - used in industrial power supplies requiring high-input-voltage step-down regulation.
For engineers reviewing the LM2591HVSX-3.3/NOPB datasheet, LM2591HVSX-3.3/NOPB pinout, LM2591HVSX-3.3/NOPB application, or LM2591HVSX-3.3/NOPB equivalent, key selection criteria include input voltage headroom (up to 60 V), thermal performance in TO-263 package, ON/OFF control interface compatibility, and fixed-output stability without external feedback resistors.
Technical Context
The LM2591HVSX-3.3/NOPB integrates a PWM controller, power switch, and internal frequency compensation in a single chip. Its 150-kHz fixed-frequency oscillator enables compact LC filter design, while the nonsynchronous architecture uses an external Schottky catch diode for efficiency optimization at low output voltages.
It operates in continuous or discontinuous conduction mode depending on load and inductor value, with built-in two-stage current limiting (1.3–2.8 A peak) and thermal shutdown protection. The ON/OFF pin provides logic-level shutdown control with 1.3 V typical threshold and ≤25 V absolute max rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% (3.168–3.432 V) across −40°C to +125°C, full line/load range - ensures stable logic supply for microcontrollers and FPGAs. |
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial inputs including 24 V, 36 V, and 48 V rails with margin for transients. |
| Max Output Current | 1 A DC - sufficient for powering SoCs, sensors, and communication interfaces without external current boosting. |
| Switching Frequency | 150 kHz (127–173 kHz over temperature) - balances EMI, inductor size, and efficiency; enables use of standard low-cost 47–100 μH power inductors. |
| Standby Quiescent Current | 90 μA typical (≤250 μA over temperature) - enables ultra-low-power sleep modes in battery-backed or energy-harvesting systems. |
| Saturation Voltage | 0.95–1.2 V at 1 A - defines minimum dropout and impacts thermal dissipation in high-current, low-VIN scenarios. |
| Oscillator Duty Cycle | 0–100% - supports full input-to-output voltage conversion range, including operation near dropout (e.g., VIN = 4.5 V → VOUT = 3.3 V). |
Pinout & Package
LM2591HVSX-3.3/NOPB is housed in a thermally enhanced DDPAK/TO-263-5 (KTT) surface-mount package (10.18 mm × 8.41 mm), featuring exposed thermal pad for PCB heatsinking and optimized layout for high-current switching paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: +VIN | Positive input supply | Accepts 4.5–60 V; requires local low-ESR bypass capacitor to handle high di/dt switching currents and suppress input rail noise. |
| 2: Output | Internal power switch drain | Swings between ≈(+VIN − VSAT) and ≈−0.5 V; connects to catch diode anode and inductor - forms main power path for buck topology. |
| 3: Ground | Power and signal reference | Common return for input/output capacitors, feedback network, and thermal pad; must be low-impedance plane for EMI and stability. |
| 4: Feedback | Regulation sense node | Internally tied to output for fixed 3.3 V version; not user-configurable - eliminates resistor divider errors and simplifies layout. |
| 5: ON/OFF | Shutdown control input | Logic-compatible enable: ≤0.6 V = active, ≥2 V = shutdown (90 μA IQ); threshold is 1.3 V typical - compatible with MCU GPIO or open-collector drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage support | 60 V max input enables direct regulation from unregulated 48 V telecom or industrial bus rails without preregulation. |
| Integrated thermal shutdown | Automatic shutdown at 150°C junction temperature prevents damage during overload or poor heatsinking - critical for sealed enclosures. |
| Two-stage current limiting | Peak switch current limit (1.3–2.8 A) plus foldback protects against short-circuit faults while maintaining regulation under moderate overload. |
| Fixed-frequency oscillator | 150-kHz operation allows predictable EMI filtering and consistent inductor sizing - avoids variable-frequency jitter in sensitive analog systems. |
| Low-standby IQ control | 90 μA shutdown current enables >1-year battery life in remote sensor nodes using coin-cell or Li-SOCl₂ batteries. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Regulating 24 V vehicle battery or 48 V industrial bus to clean 3.3 V for microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, ripple-controlled 3.3 V rail with transient immunity to load dump and cold-crank conditions. Use Value: Withstands 60 V input surges and delivers 1 A continuously - eliminates need for external pre-regulator or LDO post-regulation in cost-sensitive modules. |
Use Scenario: Powering low-power ECUs in door modules, seat controllers, or lighting nodes where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Compact, self-contained buck converter replacing discrete MOSFET+controller solutions - reduces BOM count and layout complexity. Use Value: TO-263 package enables direct copper pour heatsinking on 2-layer PCBs; 90 μA shutdown current extends battery life during vehicle sleep mode. |
| Programmable Logic Controller I/O Card | Outdoor Wireless Sensor Node |
|
Use Scenario: Generating stable 3.3 V for FPGA configuration, ADC reference, and digital I/O buffers on modular PLC backplanes. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator tolerant to wide ambient temperature (−40°C to +125°C) and conducted EMI from adjacent motor drives. Use Value: ±4% output tolerance over full temperature range ensures consistent logic thresholds and ADC accuracy without calibration drift. |
Use Scenario: Converting solar-charged 12–36 V battery to regulated 3.3 V for LoRaWAN or NB-IoT modem, MCU, and environmental sensors. IC Role / Device Role / Timing Role: Efficient primary regulator operating across wide input range and partial-load conditions - maximizes energy harvest utilization. Use Value: 77% efficiency at 12 V → 3.3 V/1 A reduces thermal rise in sealed enclosures; ON/OFF pin enables synchronized deep-sleep control with radio wake-up events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2591SX-3.3/NOPB | Lower 40 V max input voltage; identical pinout, 3.3 V output, and 1 A rating. | Suitable only for ≤40 V input systems (e.g., 24 V industrial), not for 48 V or automotive load-dump scenarios. | Select when input never exceeds 40 V - offers lower cost and same footprint but reduced voltage margin. |
| LM2596SX-3.3/NOPB | Same 60 V input, but 150 kHz frequency, 3 A rating, larger TO-263-5 package, and higher quiescent current (5 mA active). | Better for higher-current loads (>1 A) or designs needing margin for future upgrades; less suitable for ultra-low-power sleep. | Choose if system may scale to >1 A or requires higher fault-current headroom; verify PCB thermal relief for larger die size. |
Compared with LM2591SX-3.3/NOPB, LM2591HVSX-3.3/NOPB adds 20 V input headroom critical for 48 V systems; versus LM2596SX-3.3/NOPB, it trades current capacity for lower standby IQ and smaller thermal footprint - making it optimal for 1 A, low-quiescent, high-input-voltage applications.
Availability
LM2591HVSX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and programmable logic controller I/O cards requiring stable component supply with long lifecycle assurance.
Supply support for LM2591HVSX-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 designing analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The LM2591HV series was developed as part of TI's SIMPLE SWITCHER® portfolio to deliver robust, easy-to-use buck regulators for high-input-voltage applications where reliability and minimal external components are essential.
FAQ
What is the maximum input voltage rating for LM2591HVSX-3.3/NOPB?
The LM2591HVSX-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 regulation from 48 V industrial buses and withstands automotive load-dump transients per ISO 7637-2. Exceeding 60 V risks permanent damage even briefly.
Does LM2591HVSX-3.3/NOPB require external feedback resistors?
No. The LM2591HVSX-3.3/NOPB is the fixed 3.3 V output variant - its feedback pin (Pin 4) is internally connected to the output, eliminating external resistor dividers. This simplifies layout, improves regulation accuracy, and removes resistor tolerance and temperature drift effects that affect adjustable versions.
What package type is used by LM2591HVSX-3.3/NOPB?
The LM2591HVSX-3.3/NOPB uses the DDPAK/TO-263-5 (KTT) surface-mount package, measuring 10.18 mm × 8.41 mm with an exposed thermal pad. This thermally enhanced package supports high-power dissipation in compact designs and is compatible with standard reflow soldering profiles.
How does the ON/OFF pin function on LM2591HVSX-3.3/NOPB?
The ON/OFF pin (Pin 5) controls device enable state: ≤0.6 V enables normal operation; ≥2 V places LM2591HVSX-3.3/NOPB in shutdown with 90 μA typical quiescent current. The threshold is 1.3 V typical, and voltage must not exceed 25 V - allowing direct interfacing with 3.3 V or 5 V logic outputs.
What is the output voltage tolerance of LM2591HVSX-3.3/NOPB over temperature and load?
The LM2591HVSX-3.3/NOPB guarantees ±4% output voltage tolerance (3.168 V to 3.432 V) across full operating conditions: −40°C to +125°C junction temperature, 0.2 A to 1 A load, and 4.75 V to 60 V input. This tight tolerance ensures reliable operation of 3.3 V logic without additional post-regulation.
LM2591HVSX-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:
- Tape & Reel (TR)
- 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)
LM2591HVSX-3.3/NOPB FAQ
1.How can I place an order for LM2591HVSX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2591HVSX-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 LM2591HVSX-3.3/NOPB reliable?
The price and inventory of LM2591HVSX-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 LM2591HVSX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2591HVSX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2591HVSX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2591HVSX-3.3/NOPB?
LM2591HVSX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2591HVSX-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 LM2591HVSX-3.3/NOPB?
For technical support, including LM2591HVSX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2591HVSX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2591HVSX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2591HVSX-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 LM2591HVSX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2591HVSX-3.3/NOPB?
All LM2591HVSX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2591HVSX-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 LM2591HVSX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2591HVSX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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