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Texas Instruments LM2593HVSX-3.3/NOPB
- Part No.:
- LM2593HVSX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2593HVSX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 2A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,757
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Product details
Overview
LM2593HVSX-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 support up to 60 V. It integrates internal frequency compensation, thermal shutdown, current limiting, and an out-of-regulation error flag - used in industrial power supplies requiring high-input-voltage buck conversion.
For engineers reviewing the LM2593HVSX-3.3/NOPB datasheet, LM2593HVSX-3.3/NOPB pinout, LM2593HVSX-3.3/NOPB application, or LM2593HVSX-3.3/NOPB equivalent, key selection criteria include its 60-V max input rating, TO-263-7 package thermal performance (RθJA = 20°C/W with 3 in² copper), 90 µA standby current, and integrated soft-start/shutdown control via SD/SS pin.
Technical Context
The LM2593HVSX-3.3/NOPB implements a fixed-frequency (150 kHz) PWM controller with internal N-channel MOSFET switch, voltage-mode feedback using a precision 1.23-V reference, and built-in undervoltage lockout. Its architecture supports continuous conduction mode (CCM) operation with external diode, inductor, and capacitors - enabling stable regulation across 4.75–60 V input range while maintaining ≤±4% output tolerance over line, load, and temperature (–40°C to +125°C).
Functional supervision includes an open-collector error flag (Pin 3) activated when output drops below 95% of nominal, programmable power-up delay via capacitor on Pin 5, and dual-stage current limiting (peak limit ≥2.3 A, second-stage foldback). Shutdown is asserted at SD/SS ≤0.6 V, drawing only 90 µA typical quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full input (4.75–60 V), load (0.2–2 A), and temperature (–40°C to +125°C) range - ensures stable logic supply without external feedback resistors. |
| Max Input Voltage | 60 V - enables direct regulation from 48-V industrial buses, automotive transients, or unregulated AC/DC outputs without pre-regulation. |
| Switching Frequency | 150 kHz (±15%) - allows use of compact, low-cost 22–47 µH inductors and standard electrolytic output capacitors (e.g., 220 µF/25 V). |
| Output Current | 2 A DC continuous - sufficient for powering FPGAs, microcontrollers, and analog circuitry in embedded systems with minimal heatsinking. |
| Quiescent Current | 90 µA typical in shutdown - critical for battery-backed or always-on monitoring systems where standby power must be minimized. |
| Thermal Resistance | RθJA = 20°C/W (TO-263-7, 3 in² double-sided copper) - supports 2-A operation at ambient up to +85°C without external heatsink. |
| Oscillator Accuracy | ±15% over temperature - ensures predictable EMI profile and consistent filter component sizing across operating conditions. |
Pinout & Package
LM2593HVSX-3.3/NOPB is housed in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad. The package measures 10.10 mm × 8.89 mm and requires soldering the thermal pad to ≥2.5 in² of 1 oz copper for optimal thermal performance (RθJA = 30°C/W) or ≥3 in² double-sided copper for RθJA = 20°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Positive input supply | Accepts 4.75–60 V; requires low-ESR input capacitor (e.g., 470 µF aluminum) placed adjacent to minimize switching noise and transient voltage drop. |
| 2 Output | Internal switch node | Drives external Schottky diode and inductor; swings between ~VIN–1.3 V (ON) and –0.5 V (OFF); layout must minimize loop area to reduce EMI. |
| 3 Flag | Open-collector error flag | Active-low signal (≤0.3 V @ 3 mA sink) when output falls below 95% of 3.3 V; requires external pull-up resistor (4.7 kΩ typical) to logic rail ≤45 V. |
| 4 Ground | Power and signal reference | Must connect directly to PCB ground plane; shared with thermal pad - forms primary return path for high-current switch node. |
| 5 Delay | Flag delay timing | Charged by 3 µA internal current source; sets power-good assertion delay after regulation - 0.1 µF yields ~43 ms delay before Flag goes high. |
| 6 Feedback | Regulation sense (internal connection) | Internally tied to output for fixed 3.3-V version - no external divider needed; not accessible for adjustment. |
| 7 SD/SS | Shutdown/Soft-start control | Drives shutdown when ≤0.6 V (90 µA IQ); enables soft-start when ramped from 0 to ≥2.8 V via external capacitor (e.g., 0.1 µF → ~50 ms ramp). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2-A switch with 1.3-V saturation | Enables high-efficiency buck conversion without external MOSFET; low VDS(sat) reduces conduction loss at full load (e.g., <1 W dissipation at 2 A). |
| Programmable power-up delay | Capacitor on Pin 5 delays Flag assertion until output stabilizes - prevents false system reset during startup in multi-rail power systems. |
| Out-of-regulation error flag with delay | Provides reliable "power good" signaling with configurable hold-off time - essential for FPGA configuration sequencing and processor brown-out detection. |
| Shutdown/Soft-start pin (SD/SS) | Single-pin control for both enable/disable and controlled output ramp - eliminates need for external RC timing networks or dedicated supervisor ICs. |
| Thermal shutdown & two-stage current limit | First-stage peak limit (~3 A) prevents instantaneous overload damage; second-stage foldback protects during sustained short-circuit - no external protection components required. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24-V vehicle battery or 48-V industrial bus to clean 3.3-V supply for microcontroller, CAN transceiver, and sensor interface ICs. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator providing regulated 3.3-V rail with transient immunity to load dump (60-V max input) and cold-crank (4.75-V min input). Use Value: Eliminates need for external pre-regulator stage; ±4% output accuracy ensures reliable digital logic operation across temperature and aging. |
Use Scenario: Powering low-power MCU and peripheral ICs in body electronics modules where space, thermal constraints, and input voltage variability are critical. IC Role / Device Role / Timing Role: Compact, thermally efficient step-down converter mounted directly on main PCB - leverages TO-263 thermal pad for passive cooling without heatsink. Use Value: 90 µA shutdown current extends battery life during vehicle sleep mode; integrated soft-start prevents inrush-induced voltage sag on shared 12-V rail. |
| Telecom Remote Radio Unit | Test & Measurement Equipment |
|
Use Scenario: Generating stable 3.3-V supply from wide-range DC input (e.g., 36–60 V PoE++ or telecom -48 V with polarity reversal) in outdoor base station hardware. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with error flag used for health monitoring and fault reporting to host controller via GPIO. Use Value: Open-collector Flag pin simplifies interface to 3.3-V or 5-V logic; ±4% output tolerance meets strict ADC reference and PLL supply requirements. |
Use Scenario: Providing isolated, low-noise 3.3-V supply for precision analog front-ends and FPGA-based signal processing in benchtop instruments. IC Role / Device Role / Timing Role: Pre-regulator feeding low-dropout linear regulator (LDO) - improves overall efficiency vs. single-stage LDO from 24-V input. Use Value: 150-kHz fixed frequency enables predictable EMI filtering; thermal shutdown ensures safe operation during probe short-circuit or firmware lockup 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 |
|---|---|---|---|
| LM2593HVSX-5.0/NOPB | Fixed 5-V output; identical pinout, package, and electrical specs except output voltage and efficiency curve (81% @ 12 V→5 V vs. 76% @ 12 V→3.3 V). | Used where 5-V logic or legacy interface ICs require regulation - not suitable for 3.3-V-only systems without post-regulation. | Select only if target system requires 5-V rail; no PCB change needed but output capacitor and inductor values may differ slightly due to different ripple current. |
| LM2678SX-3.3/NOPB | Higher 63-V max input, 5-A output, 260-kHz switching frequency; TO-263-5 package (no Flag or Delay pins); ±2% output tolerance. | Targeted at higher-power applications needing greater current headroom or tighter regulation - lacks supervisory features (Flag, Delay, SD/SS). | Choose when >2 A load or <±2% accuracy is required; requires redesign of feedback network and layout due to missing Flag/SD/SS pins and different pin count. |
Compared with LM2593HVSX-3.3/NOPB, the 5-V variant offers higher efficiency at same input but mismatches 3.3-V logic rails, while LM2678SX-3.3/NOPB delivers more current and tighter tolerance but removes critical system-monitoring functions - making LM2593HVSX-3.3/NOPB optimal for cost-sensitive, feature-complete 2-A industrial buck designs.
Availability
LM2593HVSX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, and telecom remote radio units requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LM2593HVSX-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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM2593HV series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use in cost-sensitive, high-reliability DC-DC conversion applications where minimal external components and robust fault protection are mandatory.
FAQ
What is the maximum input voltage rating for LM2593HVSX-3.3/NOPB?
The LM2593HVSX-3.3/NOPB supports a maximum input voltage of 60 V, with absolute maximum rating at 63 V. This allows direct regulation from 48-V industrial buses, automotive battery systems with load dump transients, and unregulated AC/DC supplies - eliminating need for external pre-regulators in many high-input-voltage applications.
Does LM2593HVSX-3.3/NOPB require external feedback resistors to set output voltage?
No, LM2593HVSX-3.3/NOPB is the fixed 3.3-V output version - its feedback node is internally connected to the output, so no external resistive divider is required. This simplifies design, improves accuracy (±4% over line/load/temp), and reduces component count compared to adjustable versions like LM2593HVSX-ADJ/NOPB.
How does the Flag pin (Pin 3) function in LM2593HVSX-3.3/NOPB?
The Flag pin on LM2593HVSX-3.3/NOPB is an open-collector output that pulls low (≤0.3 V) when the 3.3-V output falls below 95% of nominal (≤3.135 V), signaling "power fail." It remains high (via external pull-up) when regulated. Combined with Delay pin (Pin 5), it provides programmable power-good timing - critical for FPGA configuration and processor reset sequencing.
What thermal performance can be expected from LM2593HVSX-3.3/NOPB in TO-263 package?
LM2593HVSX-3.3/NOPB in TO-263-7 package achieves RθJA = 20°C/W when mounted on a double-sided PCB with 3 in² of 1 oz copper on the component side and ~16 in² on the opposite side. This enables full 2-A operation at +85°C ambient without heatsink - verified in TI's SNVS082E datasheet Section 6.4.
Can LM2593HVSX-3.3/NOPB be used in shutdown mode with ultra-low power consumption?
Yes, LM2593HVSX-3.3/NOPB draws only 90 µA typical quiescent current in shutdown mode (SD/SS ≤0.6 V), as specified in Section 6.5 of the datasheet. This makes it suitable for battery-powered or energy-harvesting systems requiring extended sleep periods while retaining fast wake-up capability via the SD/SS pin.
LM2593HVSX-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:
- 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:
- 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)
LM2593HVSX-3.3/NOPB FAQ
1.How can I place an order for LM2593HVSX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2593HVSX-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 LM2593HVSX-3.3/NOPB reliable?
The price and inventory of LM2593HVSX-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 LM2593HVSX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2593HVSX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2593HVSX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2593HVSX-3.3/NOPB?
LM2593HVSX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2593HVSX-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 LM2593HVSX-3.3/NOPB?
For technical support, including LM2593HVSX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2593HVSX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2593HVSX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2593HVSX-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 LM2593HVSX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2593HVSX-3.3/NOPB?
All LM2593HVSX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2593HVSX-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 LM2593HVSX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2593HVSX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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