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Texas Instruments LM2593HVS-3.3/NOPB
- Part No.:
- LM2593HVS-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2593HVS-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 2A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,190
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Product details
Overview
LM2593HVS-3.3/NOPB from Texas Instruments is a monolithic 150-kHz non-synchronous step-down DC-DC converter delivering up to 2 A output current with ±4% output voltage accuracy, 3.3 V fixed output, and input voltage range up to 60 V. It integrates internal frequency compensation, thermal shutdown, current limiting, and soft-start/shutdown control - designed for industrial power supplies, automotive subsystems, and distributed power rails where high input voltage tolerance and stable regulation are required.
For engineers reviewing the LM2593HVS-3.3/NOPB datasheet, LM2593HVS-3.3/NOPB pinout, LM2593HVS-3.3/NOPB application, or LM2593HVS-3.3/NOPB equivalent, key selection criteria include its 60-V max input rating, 2-A load capability, TO-263-7 package thermal performance (RθJA = 30°C/W with 0.5 in² copper), integrated error flag with programmable delay, and low 90-μA standby current in shutdown mode.
Technical Context
The LM2593HVS-3.3/NOPB implements a fixed-frequency (150 kHz) current-mode buck topology with an internal N-channel DMOS switch and external diode/inductor/capacitor network. Its feedback loop references a precision 1.23-V internal bandgap, enabling tight regulation across line (4.75–60 V) and load (0.2–2 A) variations.
Functional modes include active regulation, shutdown (≤0.6 V on SD/SS pin, 90 μA IQ), and soft-start (capacitor-controlled ramp via SD/SS pin). The error flag (open-collector, ≤1 V saturation) activates when output drops below 95% of nominal and includes a programmable delay via external capacitor on the DELAY pin (3 μA charge current, 1.25 V threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full line/load/temperature range - ensures stable logic supply without external resistor divider. |
| Max Input Voltage | 60 V - supports wide-input applications including 24-V/48-V industrial buses and automotive cold-crank conditions. |
| Output Current | 2 A continuous - drives moderate-power loads such as microcontrollers, sensors, and interface ICs directly. |
| Switching Frequency | 150 kHz (±15%) - enables use of compact, low-cost magnetics and capacitors versus lower-frequency alternatives. |
| Quiescent Current | 90 μA typical in shutdown - minimizes battery drain in always-on systems or backup power domains. |
| Thermal Resistance | RθJA = 30°C/W (TO-263, 0.5 in² copper) - allows 2-A operation at ambient up to 85°C without heatsink under typical PCB layout. |
| Protection Features | Thermal shutdown, peak-current limit (3 A typ), and out-of-regulation flag - provides fault containment without external supervision circuitry. |
Pinout & Package
LM2593HVS-3.3/NOPB uses the KTW (TO-263-7) surface-mount package with exposed thermal pad (10.10 mm × 8.89 mm body size). The 7-pin configuration supports high-current routing and efficient heat dissipation through the tab soldered to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply | Accepts 4.75–60 V DC; requires local low-ESR bypass capacitor to handle high di/dt switching currents. |
| 2 - Output | Switch node | Drives external Schottky diode and inductor; swings between ~VIN−1.3 V and −0.5 V during operation. |
| 3 - Flag | Error flag output | Open-collector signal asserting low when VOUT < 95% of 3.3 V; sinks ≤3 mA; requires external pull-up. |
| 4 - Ground | Power and signal reference | Common return for input/output paths and internal circuitry; must be low-impedance connection to thermal pad. |
| 5 - Delay | Flag delay timing | Charged by 3 μA current source; sets power-good assertion delay after regulation is achieved (1.25 V threshold). |
| 6 - Feedback | Voltage sense | Internally connected to 3.3-V output; unused in fixed versions but critical for stability in adjustable variants. |
| 7 - SD/SS | Shutdown/Soft-start control | Drives shutdown (<0.6 V) or initiates controlled start-up (capacitor ramp from 0→2.8 V); internal 7-V clamp protects pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Soft-Start | Capacitor-programmable output voltage ramp prevents inrush current and stabilizes upstream supplies. |
| Power-Good Flag with Delay | Configurable delay ensures downstream logic only enables after stable regulation - avoids false resets or brownouts. |
| High-Voltage Input Capability | 60-V absolute max rating enables direct connection to unregulated 48-V telecom or industrial rails without pre-regulation. |
| Low Standby Power | 90-μA shutdown current extends battery life in portable or energy-harvesting systems requiring long idle periods. |
| Robust Protection Suite | Two-stage current limit + thermal shutdown + out-of-regulation detection eliminate need for external fault management. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Provides clean 3.3-V rail for ARM Cortex-M microcontrollers and CAN transceivers inside programmable logic controllers operating from 24-V DC field bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24-V input to isolated 3.3-V logic supply with tight load regulation and fast transient response. Use Value: Eliminates need for external supervision ICs due to integrated error flag and thermal protection - reduces BOM count and board area. | Use Scenario: Powers infotainment SoC peripherals and sensor interfaces in vehicle body control units exposed to 12-V battery with cold-crank dips to 6 V and load-dump spikes to 40 V. IC Role / Device Role / Timing Role: High-input-voltage buck converter delivering regulated 3.3 V despite wide input variation and EMI-heavy environment. Use Value: 60-V input rating withstands load-dump transients without derating; TO-263 thermal pad ensures reliability under under-hood temperature cycling. |
| Telecom Remote Radio Unit | Medical Diagnostic Imaging Subsystem |
Use Scenario: Generates 3.3-V supply for FPGAs and ADCs in outdoor 48-V-powered remote radio heads requiring high efficiency and low noise. IC Role / Device Role / Timing Role: Efficient preregulator stepping down 48 V to 3.3 V before LDO post-regulation - reduces heat generation vs. linear solution. Use Value: 76% efficiency at 12-V input/2-A load lowers thermal load; 150-kHz switching enables small filter components compatible with space-constrained RF modules. | Use Scenario: Supplies imaging sensor array and digital processing chain in portable ultrasound devices powered by rechargeable Li-ion batteries (8–12.6 V). IC Role / Device Role / Timing Role: Main DC-DC converter providing stable 3.3-V rail during high-current image capture bursts and low-power standby. Use Value: 90-μA shutdown current preserves battery charge during multi-hour idle periods; soft-start prevents voltage droop affecting analog front-end calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2593HV-3.3/NOPB | Same silicon, TO-220-7 package; higher RθJA (50°C/W) limits power density. | Better suited for prototyping or low-volume designs where through-hole mounting is preferred. | Select when mechanical compatibility with legacy TO-220 footprints is required and thermal headroom permits. |
| LM2678-3.3/NOPB | Higher 2.5-A rating, 260-kHz switching, no error flag or delay pin; different pinout. | Optimized for higher-current, cost-sensitive applications where supervisory features are handled externally. | Choose when >2-A load capability is needed and system-level power-good signaling is already implemented. |
Compared with LM2593HV-3.3/NOPB, the TO-263 variant offers superior thermal performance for compact layouts, while LM2678-3.3/NOPB trades supervisory functions for higher current and faster switching - making LM2593HVS-3.3/NOPB optimal for space-constrained, safety-aware designs needing integrated fault reporting.
Availability
LM2593HVS-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, telecom remote radio units, and medical diagnostic imaging subsystems requiring stable component supply with long-term manufacturability.
Supply support for LM2593HVS-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 solutions.
The LM2593HV family was engineered for rugged, wide-input-voltage DC-DC conversion in industrial, automotive, and telecom infrastructure - emphasizing simplicity, thermal robustness, and integrated protection without external complexity.
FAQ
What is the maximum input voltage rating for LM2593HVS-3.3/NOPB?
The LM2593HVS-3.3/NOPB has an absolute maximum input voltage rating of 63 V and a recommended operating range of 4.75 V to 60 V. This allows direct integration into 48-V telecom systems and automotive applications experiencing load-dump transients. Operation above 60 V is not advised per TI's recommended conditions, even though the absolute maximum is slightly higher.
Does LM2593HVS-3.3/NOPB require an external feedback resistor network?
No, LM2593HVS-3.3/NOPB is the fixed 3.3-V output version and contains an internal resistor divider that sets the feedback reference to 1.23 V. Pin 6 (Feedback) is internally connected to the output and requires no external components - unlike the adjustable LM2593HVS version which needs two external resistors.
How does the error flag (FLAG pin) function on LM2593HVS-3.3/NOPB?
The FLAG pin on LM2593HVS-3.3/NOPB is an open-collector output that pulls low (≤1 V) when the regulated output falls below 95% of 3.3 V (i.e., <3.135 V). It can sink up to 3 mA and requires an external pull-up resistor. Its assertion is delayed by a capacitor on the DELAY pin, allowing configurable power-good timing independent of startup slew rate.
What thermal performance can be expected from LM2593HVS-3.3/NOPB in a standard PCB layout?
With the TO-263-7 package's thermal pad soldered to 0.5 in² of 1-oz copper, LM2593HVS-3.3/NOPB achieves RθJA = 30°C/W. At 2-A load and 12-V input, typical power dissipation is ~1.5 W, resulting in ~45°C junction-to-ambient rise - enabling reliable operation up to 85°C ambient without forced air or heatsink.
Can LM2593HVS-3.3/NOPB be used in shutdown mode with ultra-low power consumption?
Yes, LM2593HVS-3.3/NOPB draws only 90 μA typical quiescent current when the SD/SS pin is held ≤0.6 V, placing it in full shutdown. This makes it suitable for battery-backed systems or energy-harvesting applications where standby power must remain below 100 μA across temperature and input voltage extremes.
LM2593HVS-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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:
- 2A
- 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-7)
LM2593HVS-3.3/NOPB FAQ
1.How can I place an order for LM2593HVS-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2593HVS-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 LM2593HVS-3.3/NOPB reliable?
The price and inventory of LM2593HVS-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 LM2593HVS-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2593HVS-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2593HVS-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2593HVS-3.3/NOPB?
LM2593HVS-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2593HVS-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 LM2593HVS-3.3/NOPB?
For technical support, including LM2593HVS-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2593HVS-3.3/NOPB requirements.
6.How does Aetrix verify that LM2593HVS-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2593HVS-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 LM2593HVS-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2593HVS-3.3/NOPB?
All LM2593HVS-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2593HVS-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 LM2593HVS-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2593HVS-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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