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Texas Instruments LM2593HVS-ADJ
- Part No.:
- LM2593HVS-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2593HVS-ADJ.pdf
- Description:
- IC REG BUCK ADJ 2A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:2,254
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Product details
Overview
LM2593HVS-ADJ from Texas Instruments is a monolithic 150-kHz non-synchronous step-down DC-DC converter IC designed for high-input-voltage industrial and automotive power supplies. It delivers up to 2 A load current with ±4% output voltage accuracy across 1.2 V to 57 V, supports shutdown/soft-start control, and integrates an out-of-regulation error flag with programmable delay. It is used in on-card buck regulators requiring input voltages up to 60 V.
For engineers reviewing the LM2593HVS-ADJ datasheet, LM2593HVS-ADJ pinout, LM2593HVS-ADJ application, or LM2593HVS-ADJ equivalent, key selection criteria include its 60-V max input rating, adjustable feedback reference of 1.23 V, 90-μA standby current, thermal shutdown protection, and compatibility with TO-263-7 surface-mount layout.
Technical Context
The LM2593HVS-ADJ implements a fixed-frequency (150 kHz) current-mode PWM controller with internal switch, enabling stable regulation without external compensation. Its feedback loop references a precise 1.23-V bandgap voltage at the Feedback pin, allowing output adjustment via external resistor divider.
It features dual-stage overcurrent protection, thermal shutdown, and a dedicated Delay pin that controls flag assertion timing using an internal 3-μA current source charging an external capacitor. The SD/SS pin provides both shutdown (≤0.6 V) and soft-start (capacitor ramp) functionality via a single terminal with 1.3-V threshold and internal clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial rails including 24-V, 36-V, and 48-V systems without pre-regulation. |
| Output Current | 2 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Feedback Reference Voltage | 1.23 V ±2.7% - sets output voltage via R1/R2 divider; enables 1.2 V to 57 V adjustment range with high accuracy. |
| Switching Frequency | 150 kHz (±15%) - allows use of compact, low-cost inductors and capacitors while balancing efficiency and EMI. |
| Standby Quiescent Current | 90 μA typical - minimizes battery drain in always-on or low-power monitoring applications. |
| Oscillator Accuracy | ±15% over temperature - ensures predictable filter sizing and consistent transient response across –40°C to 125°C. |
| Thermal Shutdown Threshold | 150°C junction - protects against sustained overload or poor heatsinking in enclosed environments. |
Pinout & Package
LM2593HVS-ADJ is supplied in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad for enhanced heat dissipation. Package dimensions are 10.10 mm × 8.89 mm, and the thermal pad must be soldered to a PCB copper area for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Power Input | Accepts 4.5–60 V DC; requires local low-ESR bypass capacitor to suppress switching transients and supply peak currents. |
| 2 Output | Internal Switch Drain | Drives external diode and inductor; swings between ~VIN–1.3 V (ON) and –0.5 V (OFF); not a regulated output node. |
| 3 Flag | Error Flag Output | Open-collector signal active low ≤1 V when output drops below 95% nominal; sinks up to 3 mA; requires external pull-up. |
| 4 Ground | Power & Signal Reference | Common return path for input, output, feedback, and control circuits; must be low-impedance connection to thermal pad. |
| 5 Delay | Flag Timing Control | Charged by internal 3-μA source; flag goes high after capacitor voltage exceeds 1.3 V - sets power-good delay time. |
| 6 Feedback | Voltage Sense Input | Compares divided output voltage to 1.23-V internal reference; determines regulation point; sensitive to noise and feedforward coupling. |
| 7 SD/SS | Shutdown/Soft-Start Control | Drives device ON/OFF (≤0.6 V = shutdown, ≥2 V = active); capacitor here enables controlled output voltage ramp-up. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 1.2 V to 57 V - supports diverse system rail requirements using only two external resistors, no trimming needed. |
| Integrated Error Flag with Delay | Programmable power-good assertion timing - avoids false flag triggers during startup; enables sequencing in multi-rail systems. |
| Low Standby Current | 90 μA typical - extends battery life in portable or remote sensing equipment where regulator remains powered but inactive. |
| Fixed 150-kHz Switching | Predictable EMI profile and filter design - simplifies compliance testing and reduces component count vs. variable-frequency alternatives. |
| Two-Stage Overcurrent Protection | Peak current limit + foldback - prevents MOSFET failure under short-circuit while maintaining safe thermal operation. |
| Thermal Shutdown with Hysteresis | 150°C trip, ~20°C hysteresis - ensures reliable recovery after fault clearance without oscillation or latch-up. |
Applications
| Industrial 24-V Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Converting 24-V vehicle battery or factory bus to 5-V or 3.3-V for MCU and CAN transceivers. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 2-A regulated output; handles load dumps up to 60 V transiently. Use Value: Eliminates need for external pre-regulator; ±4% output tolerance ensures reliable digital logic operation across temperature and line variation. |
Use Scenario: Powering microcontroller, EEPROM, and sensor interfaces in door modules or lighting controllers. IC Role / Device Role / Timing Role: On-board buck converter with shutdown control synchronized to vehicle ignition state. Use Value: 90-μA standby current enables always-on wake-up capability; thermal shutdown prevents damage during enclosure overheating. |
| Telecom Remote Radio Unit | Test Equipment Auxiliary Rail |
|
Use Scenario: Generating isolated 12-V or 15-V bias from 48-V telecom plant power in outdoor base stations. IC Role / Device Role / Timing Role: High-input-voltage preregulator feeding linear post-regulators for low-noise analog circuitry. Use Value: 150-kHz fixed frequency enables predictable filtering; error flag signals loss of regulation before downstream brownout. |
Use Scenario: Providing user-configurable auxiliary voltage (e.g., ±12 V, 15 V) in benchtop power analyzers or signal generators. IC Role / Device Role / Timing Role: Adjustable-output DC-DC stage supporting multiple test configurations via front-panel software. Use Value: 1.23-V feedback reference enables precise output setting; soft-start prevents inrush into downstream capacitive loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596HV-ADJ | Higher 150-kHz oscillator tolerance (±20% vs. ±15%), lower 3-A output current rating, same 60-V input max. | Lacks dedicated Delay pin and flag delay programming; uses simpler open-drain flag without timing control. | Choose LM2596HV-ADJ when flag timing is unnecessary and higher output current is required; verify thermal margin with TO-220 package. |
| MP2451DT-LF-Z | 36-V max input (vs. 60 V), 0.6-A output, 2-MHz switching, integrated high-side MOSFET, no flag/delay pins. | No error flag or programmable delay; optimized for space-constrained, low-current applications rather than industrial robustness. | Choose MP2451DT-LF-Z for compact 12-V or 24-V systems where size matters more than high-voltage resilience or supervision features. |
Compared with LM2593HVS-ADJ, LM2596HV-ADJ trades flag flexibility for higher current, while MP2451DT-LF-Z sacrifices input voltage range and supervision for integration and footprint reduction - making LM2593HVS-ADJ uniquely suited for rugged, high-voltage, supervised buck conversion.
Availability
LM2593HVS-ADJ is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LM2593HVS-ADJ 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 LM2593HV family was engineered for rugged, high-input-voltage DC-DC conversion in harsh environments - targeting applications where input transients, thermal stress, and supervision integrity are critical design constraints.
FAQ
What is the maximum input voltage supported by the LM2593HVS-ADJ?
The LM2593HVS-ADJ supports a maximum input voltage of 60 V, with absolute maximum rating at 63 V. This enables direct operation from 24-V, 36-V, and 48-V industrial or automotive buses, including handling of load-dump transients common in vehicle electrical systems. Operation above 60 V risks permanent damage and violates recommended conditions.
How does the Feedback pin function in the LM2593HVS-ADJ?
The Feedback pin of the LM2593HVS-ADJ senses the output voltage through an external resistor divider and compares it to an internal 1.23-V reference. When the divided voltage equals 1.23 V, regulation is achieved. The LM2593HVS-ADJ adjusts duty cycle to maintain this condition, enabling output voltages from 1.2 V to 57 V. Bias current is only 10 nA typical, minimizing divider power loss.
Can the LM2593HVS-ADJ be used in a negative-output configuration?
Yes - the LM2593HVS-ADJ can generate a low-current negative output using an external charge pump circuit, as documented in TI's application note (Figure 28). This requires a minimum 1.2-A positive output load and a series current-limiting resistor. The LM2593HVS-ADJ itself remains configured as a standard buck regulator; the negative rail is derived passively from its switching node.
What is the purpose of the Delay pin on the LM2593HVS-ADJ?
The Delay pin on the LM2593HVS-ADJ controls the timing of the Flag pin's transition from low to high after output regulation is achieved. An external capacitor charged by an internal 3-μA current source determines this delay - flag asserts high once the capacitor voltage exceeds 1.3 V. This prevents premature "power good" signals during output settling or light-load instability.
Does the LM2593HVS-ADJ require external compensation components?
No - the LM2593HVS-ADJ includes internal frequency compensation and is designed for stable operation with minimal external parts: input/output capacitors, diode, and inductor. No external compensation network is needed. However, a feedforward capacitor across the upper feedback resistor is recommended for outputs >10 V or low-ESR output capacitors to improve phase margin and prevent flag false triggering.
LM2593HVS-ADJ 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:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 57V
- 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-ADJ FAQ
1.How can I place an order for LM2593HVS-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2593HVS-ADJ 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-ADJ reliable?
The price and inventory of LM2593HVS-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2593HVS-ADJ is usually 5 days.
3.What payment methods are accepted for LM2593HVS-ADJ?
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4.How is shipping managed for LM2593HVS-ADJ?
LM2593HVS-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2593HVS-ADJ 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-ADJ?
For technical support, including LM2593HVS-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2593HVS-ADJ requirements.
6.How does Aetrix verify that LM2593HVS-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2593HVS-ADJ 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-ADJ meets industry standards.
7.What is the process for return or replacement of LM2593HVS-ADJ?
All LM2593HVS-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2593HVS-ADJ, 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-ADJ part is unused and in its original packaging.
Return procedure for LM2593HVS-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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