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Texas Instruments LM2593HVT-ADJ
- Part No.:
- LM2593HVT-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2593HVT-ADJ.pdf
- Description:
- IC REG BUCK ADJ 2A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,810
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Product details
Overview
LM2593HVT-ADJ from Texas Instruments (formerly National Semiconductor) is a monolithic 150 kHz step-down (buck) switching regulator IC capable of delivering 2A output current with adjustable output voltage from 1.2V to 57V. It integrates internal frequency compensation, fixed-frequency oscillator, shutdown/soft-start control, and out-of-regulation error flag. Designed for high-efficiency DC-DC conversion in industrial power supplies and embedded systems requiring wide input range up to 60V.
For engineers reviewing the LM2593HVT-ADJ datasheet, LM2593HVT-ADJ pinout, LM2593HVT-ADJ application, or LM2593HVT-ADJ equivalent, key selection considerations include guaranteed ±4% output voltage tolerance over line/load/temperature, 90 µA standby current in shutdown mode, thermal shutdown and two-stage current limiting, TO-220 package thermal resistance (θJA = 50°C/W), and feedback voltage accuracy of 1.230 V ±3.4%.
Technical Context
The LM2593HVT-ADJ implements a current-mode buck topology with an internal 150 kHz fixed-frequency oscillator and integrated 2A N-channel DMOS switch. Its feedback loop references a precise 1.230 V bandgap voltage at Pin 6, enabling programmable output via external resistor divider. The device operates across 4.5V–60V input and supports soft-start via external capacitor on Pin 7 and programmable power-good delay via capacitor on Pin 5.
Protection architecture includes cycle-by-cycle peak current limiting (2.4 A min), thermal shutdown at +150°C junction temperature, and output short-circuit recovery via hiccup mode. The error flag (Pin 3) asserts low when output drops below 92% of nominal, with internal 1.25 V delay threshold and 3 mA sink capability - all implemented without external components beyond standard passives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 2 A continuous load current - enables single-chip regulation for mid-power applications without external MOSFETs. |
| Input Voltage Range | 4.5 V to 60 V - supports wide-range industrial, automotive, and telecom inputs including 48 V systems. |
| Feedback Voltage | 1.230 V ±3.4% (1.180–1.280 V) - sets output voltage accuracy baseline; determines R1/R2 ratio for target VOUT. |
| Switching Frequency | 150 kHz ±15% - enables use of compact, low-cost inductors and capacitors while avoiding AM radio band interference. |
| Efficiency | 75% at VIN = 12 V, VOUT = 3 V, ILOAD = 2 A - reflects conduction and switching losses under typical mid-voltage conversion. |
| Standby Current | 90 µA typical (≤250 µA max) in shutdown - critical for battery-backed or always-on systems requiring ultra-low quiescent power. |
| Thermal Resistance | θJA = 50°C/W (TO-220, no heatsink) - defines maximum power dissipation before thermal shutdown: ~1.2 W at ΔT = 60°C. |
Pinout & Package
LM2593HVT-ADJ is supplied in a 7-lead TO-220 package with bent/staggered leads for through-hole mounting. The exposed tab is electrically connected to Pin 4 (Ground) and serves as primary thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VIN (Pin 1) | Primary power input | Accepts 4.5–60 V DC; requires local low-ESR bypass capacitor to handle high di/dt switching currents. |
| Output (Pin 2) | Internal switch drain node | Swings between ≈(+VIN − 1.4 V) and ≈−0.5 V; connects to inductor and catch diode anode in buck topology. |
| Error Flag (Pin 3) | Open-collector status output | Sinks ≤3 mA when VOUT < 92% nominal; requires external pull-up to logic rail ≤45 V (or resistive divider if higher). |
| Ground (Pin 4) | Power and signal reference | Common return for input/output paths, feedback, and thermal tab; must be low-impedance PCB plane connection. |
| Delay (Pin 5) | Programmable power-good delay | Charged by 3 µA internal current source; flag goes high after capacitor voltage exceeds 1.25 V - sets startup timing. |
| Feedback (Pin 6) | Voltage sense input | References 1.230 V; connected to resistor divider from VOUT; requires Schottky clamp if VIN > 40 V and CFF used. |
| SD/SS (Pin 7) | Shutdown and soft-start control | <0.6 V = shutdown (90 µA IQ); ≥2.0 V = normal operation; capacitor here controls output ramp rate during startup. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Range | 1.2 V to 57 V via external R1/R2 divider - supports custom rail generation without stockkeeping multiple fixed-voltage variants. |
| Integrated Soft-Start | Controlled output voltage ramp using single capacitor on Pin 7 - eliminates inrush current stress on input source and output capacitors. |
| Out-of-Regulation Detection | Dedicated open-drain flag with 1.25 V delay threshold and 96% dropout detection - enables system-level power sequencing and fault logging. |
| Two-Stage Current Limit | Peak switch current limit (2.4 A min) plus thermal foldback - prevents destructive failure during overload or short-circuit conditions. |
| High-Efficiency Operation | 75–81% typical efficiency across 3.3 V/5 V/adjustable outputs - reduces thermal load and improves power density vs. linear regulators. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
|
Use Scenario: Generating stable 12 V or 5 V rails from 24 V truck battery with transient immunity up to 60 V. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, regulated DC power for microcontrollers, sensors, and CAN transceivers. Use Value: Withstands load dump pulses per ISO 7637-2; 90 µA shutdown current extends battery life during vehicle sleep mode. |
Use Scenario: On-board 3.3 V supply for infotainment head unit MCU and memory subsystem. IC Role / Device Role / Timing Role: Buck converter delivering 2 A at 3.3 V from 12 V nominal battery, with soft-start preventing brownout during ignition. Use Value: ±4% output tolerance ensures reliable operation across temperature and battery voltage swing; TO-220 package simplifies mechanical mounting in constrained chassis space. |
| Telecom Remote Radio Unit | Programmable Test Equipment |
|
Use Scenario: Converting -48 V telecom supply to +5 V for FPGA I/O banks and ADC front-end circuitry. IC Role / Device Role / Timing Role: Positive-to-negative inverting buck-boost configuration using LM2593HVT-ADJ with bootstrapped ground reference. Use Value: Adjustable feedback allows precise 5.00 V output; 150 kHz switching enables small magnetics compatible with dense RF board layouts. |
Use Scenario: Lab-grade DC power module with user-selectable output voltage (1.2–30 V) and current limit. IC Role / Device Role / Timing Role: Core voltage regulation stage where R1/R2 potentiometer sets output; error flag signals overvoltage/overcurrent faults. Use Value: Guaranteed 2 A output and ±4% regulation support repeatable calibration; shutdown pin enables remote power cycling via microcontroller GPIO. |
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 200 kHz switching frequency; lower 3.5 A current limit; same 60 V input rating and 1.23 V feedback reference. | Better suited for smaller filter components but reduced thermal margin at 2 A continuous due to lower current limit headroom. | Select when board space is constrained and efficiency above 85% is required at light loads; verify thermal performance at full 2 A. |
| MP2315GJ-Z | 3 A rated output; 500 kHz switching; requires external compensation; no integrated error flag or delay function. | Enables higher power density but demands additional design effort for loop stability and fault signaling implementation. | Choose for compact, high-efficiency designs where external flag logic is acceptable and layout area is premium. |
Compared with LM2593HVT-ADJ, LM2596HV-ADJ offers higher frequency for smaller passives but less current margin, while MP2315GJ-Z delivers higher current and frequency at the cost of integrated protection features - making LM2593HVT-ADJ optimal for robust, drop-in industrial power stages needing minimal external components.
Availability
LM2593HVT-ADJ is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and telecom infrastructure requiring stable component supply with long lifecycle assurance and consistent parametric performance.
Supply support for LM2593HVT-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 acquired National Semiconductor in 2011 and maintains legacy SIMPLE SWITCHER® product lines with full datasheet, simulation model, and application support.
The LM2593HV series was designed specifically for rugged, high-input-voltage DC-DC conversion in industrial and transportation systems where reliability, wide VIN range, and integrated protection are mandatory.
FAQ
What is the minimum input voltage required for stable operation of the LM2593HVT-ADJ?
The LM2593HVT-ADJ specifies an operating input voltage range of 4.5 V to 60 V. Below 4.5 V, the internal bias circuitry cannot sustain regulation, and the device may enter undervoltage lockout or fail to initiate switching. This 4.5 V minimum ensures reliable startup and continuous operation even with significant input droop under load, making LM2593HVT-ADJ suitable for 5 V and 12 V systems with marginal headroom.
How does the feedback pin (Pin 6) of the LM2593HVT-ADJ determine output voltage?
The LM2593HVT-ADJ regulates output by maintaining 1.230 V at Pin 6 (Feedback). In adjustable configurations, this is achieved using a resistor divider (R1 from VOUT to Pin 6, R2 from Pin 6 to GND), where VOUT = 1.230 × (1 + R1/R2). The precision of this 1.230 V reference - guaranteed ±3.4% over temperature and line - directly sets the absolute accuracy of the final output voltage, independent of external resistor tolerances.
Can the LM2593HVT-ADJ be used in an inverting (positive-to-negative) configuration?
Yes, the LM2593HVT-ADJ supports inverting buck-boost topologies by bootstrapping the Ground (Pin 4) to the negative output rail and referencing Feedback (Pin 6) to system ground. This configuration is documented in the datasheet (Figure 10) and enables generation of negative outputs such as −5 V or −12 V from positive inputs. However, peak switch current must be evaluated per buck-boost equations, and inductor saturation must be verified for ICLIM = 2.4 A minimum.
What thermal derating applies to the LM2593HVT-ADJ in TO-220 package without a heatsink?
In the standard 7-lead TO-220 package (LM2593HVT-ADJ), θJA is 50°C/W with no heatsink and 1 in² copper area. At ambient 25°C and maximum junction temperature of +150°C, allowable power dissipation is (150 − 25)/50 = 2.5 W. Given typical 75% efficiency at 12 V → 3 V/2 A, power loss is ~2 W - confirming safe operation at full 2 A without forced air or heatsink under these conditions.
Is the error flag (Pin 3) of the LM2593HVT-ADJ compatible with 5 V logic systems?
Yes, the LM2593HVT-ADJ error flag (Pin 3) is an open-collector output rated for up to 45 V, making it fully compatible with standard 5 V logic pull-up configurations. When active (output out of regulation), Pin 3 pulls low to ≤0.7 V while sinking up to 3 mA. For direct interfacing to 5 V microcontrollers, a 4.7 kΩ pull-up resistor suffices; no level-shifting is needed unless the host system uses >45 V logic rails.
LM2593HVT-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2593HVT-ADJ FAQ
1.How can I place an order for LM2593HVT-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2593HVT-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 LM2593HVT-ADJ reliable?
The price and inventory of LM2593HVT-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2593HVT-ADJ is usually 5 days.
3.What payment methods are accepted for LM2593HVT-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2593HVT-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2593HVT-ADJ?
LM2593HVT-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2593HVT-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 LM2593HVT-ADJ?
For technical support, including LM2593HVT-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2593HVT-ADJ requirements.
6.How does Aetrix verify that LM2593HVT-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2593HVT-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 LM2593HVT-ADJ meets industry standards.
7.What is the process for return or replacement of LM2593HVT-ADJ?
All LM2593HVT-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2593HVT-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 LM2593HVT-ADJ part is unused and in its original packaging.
Return procedure for LM2593HVT-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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