My Inquiry
My Account
onsemi LM2594DADJR2G
- Part No.:
- LM2594DADJR2G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2594DADJR2G.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,813
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2594DADJR2G from onsemi is a monolithic step-down switching regulator (buck converter) delivering 0.5 A output current with 150 kHz fixed-frequency operation, adjustable output voltage from 1.23 V to 37 V, and wide 4.5–40 V input range. It integrates internal compensation, thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control-designed for high-efficiency DC-DC conversion in space-constrained industrial power supplies.
For engineers reviewing the LM2594DADJR2G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed ±4% feedback voltage tolerance, 1.0–1.4 V switch saturation voltage at 0.5 A, standby current of 50 µA typical, and SOIC-8 package compatibility with standard PCB layout guidelines for EMI-sensitive buck topologies.
Technical Context
The LM2594DADJR2G implements a voltage-mode PWM controller with an internal 150 kHz oscillator and integrated NPN bipolar output switch. Its error amplifier compares the FB pin voltage against a precise 1.23 V reference to regulate output via external resistor divider, enabling programmable output without external compensation components.
Protection architecture includes cycle-by-cycle peak-current limiting (0.65–1.8 A), thermal shutdown at 150 °C junction temperature, and logic-level ON/OFF pin with 1.6 V threshold-allowing low-power disable mode while maintaining <250 µA total supply current during shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 0.5 A continuous load capability with thermal derating above 25 °C ambient. |
| Input Voltage Range | 4.5 V to 40 V DC-supports 12 V, 24 V, and 36 V industrial bus rails with margin for transients. |
| Switching Frequency | Fixed 150 kHz-enables compact LC filter design with standard 100 µH inductors and 220 µF output capacitors. |
| Feedback Reference | 1.23 V ±4% at 25 °C-sets output voltage accuracy when used with precision external resistors R1/R2. |
| Standby Current | 50 µA typical at ON/OFF = 5 V-minimizes system power draw in sleep or standby states. |
| Switch Saturation | 1.0–1.4 V at 0.5 A-directly impacts conduction loss and efficiency at full load. |
| Oscillator Tolerance | ±15% over temperature-ensures predictable ripple frequency and EMI profile across operating range. |
Pinout & Package
LM2594DADJR2G is housed in an 8-lead SOIC surface-mount package (Case 751, D suffix), moisture sensitivity level (MSL) 1, Pb-free, with standard 1.27 mm lead pitch and 5.0 mm × 6.2 mm body dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3 | NC | No internal connection-must remain unconnected; floating or tied to GND per layout best practice. |
| 4 | FB | Error amplifier inverting input-connects to resistor divider to set output voltage; bias current ≤200 nA minimizes divider error. |
| 5 | ON/OFF | Logic-enable input-<1.6 V enables regulation; ≥2.2 V disables with 50 µA standby current. |
| 6 | GND | Power and signal ground reference-requires low-impedance single-point or ground plane connection. |
| 7 | +VIN | Main input supply-requires local 68 µF low-ESR capacitor to suppress switching transients. |
| 8 | OUTPUT | Emitter of internal NPN switch-drives external catch diode and inductor; PCB copper area must be minimized to reduce EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Compensation | Eliminates need for external compensation network-reduces BOM count and layout complexity in buck designs. |
| TTL Shutdown | Compatible with 3.3 V/5 V logic-enables microcontroller-controlled power sequencing without level-shifting. |
| Thermal + Current Protection | Self-recovering shutdown under overload or overtemperature-prevents permanent damage during fault conditions. |
| Adjustable Output Range | 1.23–37 V via two-resistor feedback-supports diverse rail requirements from 3.3 V logic to 24 V actuators. |
| Low Standby Power | 50 µA typical quiescent current in shutdown-critical for battery-backed or energy-harvesting systems. |
Applications
| Industrial Motor Control Power | Automotive Body Control Module |
|---|---|
Use Scenario: Supplies 5 V/0.5 A to microcontrollers and I/O drivers in PLC backplanes with 24 V nominal input and 40 V surge tolerance. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, efficient, and thermally robust DC-DC conversion with built-in fault protection. Use Value: Eliminates need for external current-sense or thermal monitoring circuitry-reducing board area and qualification effort. | Use Scenario: Powers CAN transceiver and sensor interface circuits in vehicle door modules using 12 V battery rail with cold-crank down to 4.5 V. IC Role / Device Role / Timing Role: Pre-regulator stepping 12 V down to 5 V before linear LDO-improving overall system efficiency vs. direct linear regulation. Use Value: Maintains regulation during cranking events due to wide 4.5–40 V input range and stable 150 kHz switching under load transients. |
| Medical Portable Diagnostic Device | IoT Edge Sensor Node |
Use Scenario: Generates stable 3.3 V rail for ARM Cortex-M MCU and analog front-end from single-cell Li-ion (4.2 V) or dual-cell (8.4 V) battery pack. IC Role / Device Role / Timing Role: Adjustable buck converter configured for 3.3 V output with ON/OFF control synchronized to sensor sampling intervals. Use Value: Achieves >80% efficiency at 500 mA load-extending battery life while meeting IEC 60601 leakage and EMI requirements. | Use Scenario: Powers ultra-low-power MCU, BLE radio, and environmental sensors in battery-operated smart meter with 10-year lifetime target. IC Role / Device Role / Timing Role: High-efficiency pre-regulator enabling deep-sleep modes with 50 µA shutdown current and fast wake-up response. Use Value: Reduces average system current by >90% vs. non-shutdown alternatives-directly enabling multi-year operation on AA cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2594MX-5.0/NOPB | Fixed 5.0 V output; same SOIC-8 package, 0.5 A rating, and 150 kHz frequency-but no external feedback adjustment. | Suitable only where 5.0 V output is fixed; eliminates R1/R2 but sacrifices flexibility for other voltages. | Select when output voltage is invariant and board space for feedback resistors must be minimized. |
| MP1584EN-LF-Z | Higher 3 A output, 1.5 MHz switching, smaller external components-but requires external compensation and has different pinout. | Better suited for higher-current or size-constrained designs; not drop-in compatible due to different FB/COMP/EN pin functions. | Choose for new designs needing >0.5 A or faster transient response; avoid for LM2594DADJR2G replacement without layout change. |
Compared with LM2594MX-5.0/NOPB, LM2594DADJR2G offers full output adjustability at identical footprint and protection features; versus MP1584EN-LF-Z, it trades higher current and frequency for simpler design-in and legacy compatibility-making it optimal for cost-sensitive, moderate-power industrial upgrades.
Availability
LM2594DADJR2G is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, portable medical devices, and IoT edge nodes requiring stable component supply with long lifecycle support.
Supply support for LM2594DADJR2G 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2594 product line delivers rugged, easy-to-use buck regulators targeting cost-sensitive, high-reliability power conversion in harsh environments-emphasizing internal protection, wide input range, and minimal external component count.
FAQ
What is the maximum input voltage rating for LM2594DADJR2G?
The absolute maximum input voltage for LM2594DADJR2G is 45 V, with recommended operating range from 4.5 V to 40 V. Exceeding 45 V risks permanent damage per the Absolute Maximum Ratings table. For reliable long-term operation, design margins should keep VIN ≤ 36 V under worst-case transients, especially when paired with 40 V-rated input capacitors.
Does LM2594DADJR2G require external compensation components?
No, LM2594DADJR2G features fully internal loop compensation-no external capacitor or resistor is needed on the COMP or FB pins. This simplifies design and reduces bill-of-materials cost. The internal compensation is optimized for standard buck configurations using 100 µH inductors and 220 µF output capacitors, as validated in the Typical Application Circuit (Figure 1).
How does the ON/OFF pin function in LM2594DADJR2G?
The ON/OFF pin (Pin 5) provides logic-level enable/disable control: applying <1.6 V (or leaving open) enables regulation; applying ≥2.2 V disables the internal switch and reduces total supply current to 50 µA typical. The pin accepts 3.3 V or 5 V logic signals directly-no level-shifting required-and maintains state through power cycling if driven externally.
What is the purpose of the NC pins (1–3) on LM2594DADJR2G?
Pins 1–3 on LM2594DADJR2G are Not Connected internally and must remain unconnected on the PCB. They may be left floating or tied to GND for mechanical stability-however, routing traces or vias to them is unnecessary and may introduce parasitic capacitance. This pin configuration is consistent across all SOIC-8 variants of the LM2594 family per the official marking diagram and pin function description.
Can LM2594DADJR2G be used in negative-output (buck-boost) configurations?
Yes, LM2594DADJR2G supports positive-to-negative conversion (inverting buck-boost topology) as documented in the Applications section of the datasheet. In this configuration, the OUTPUT pin drives the inductor to ground, the catch diode connects between OUTPUT and negative output rail, and feedback is referenced to the negative rail. Layout must follow strict ground separation guidelines to avoid noise coupling into the FB node.
LM2594DADJR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 500mA
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2594DADJR2G FAQ
1.How can I place an order for LM2594DADJR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2594DADJR2G 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 LM2594DADJR2G reliable?
The price and inventory of LM2594DADJR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2594DADJR2G is usually 5 days.
3.What payment methods are accepted for LM2594DADJR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2594DADJR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2594DADJR2G?
LM2594DADJR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2594DADJR2G 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 LM2594DADJR2G?
For technical support, including LM2594DADJR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2594DADJR2G requirements.
6.How does Aetrix verify that LM2594DADJR2G is sourced from the original manufacturer or authorized distributors?
All LM2594DADJR2G 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 LM2594DADJR2G meets industry standards.
7.What is the process for return or replacement of LM2594DADJR2G?
All LM2594DADJR2G units undergo pre-shipment inspection (PSI). If there is an issue with LM2594DADJR2G, 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 LM2594DADJR2G part is unused and in its original packaging.
Return procedure for LM2594DADJR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2594DADJR2G Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
