My Inquiry
My Account
onsemi LM2596DSADJR4G
- Part No.:
- LM2596DSADJR4G
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2596DSADJR4G.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,020
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2596DSADJR4G from onsemi is a monolithic 3.0 A step-down (buck) switching regulator IC with adjustable output voltage (1.23 V to 37 V), 150 kHz fixed-frequency internal oscillator, and integrated 3.0 A power switch. It delivers excellent line/load regulation, features internal loop compensation, thermal shutdown, cycle-by-cycle current limiting, and TTL-compatible ON/OFF control - designed for high-efficiency DC-DC conversion in industrial power supplies and embedded systems.
For engineers reviewing the LM2596DSADJR4G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain-ready availability details - all grounded in the official onsemi LM2596 datasheet (Rev. 1, Dec. 2022).
Technical Context
The LM2596DSADJR4G implements a voltage-mode controlled buck topology with a 150 kHz fixed-frequency oscillator and internal 1.235 V bandgap reference. Its error amplifier compares feedback voltage against this reference to drive a 3.0 A NPN switch via a fixed-gain comparator and driver stage.
Protection architecture includes cycle-by-cycle current limit triggered at ≥4.2 A (typ), thermal shutdown at TJ ≥150°C, and logic-controlled shutdown via Pin 5 (ON/OFF) with 1.6 V threshold and 80 µA standby current. The device operates across −40°C to +125°C junction temperature and supports input voltages from 4.5 V to 40 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 3.0 A continuous load current - enables single-chip regulation for mid-power applications without external pass devices. |
| Input Voltage Range | 4.5 V to 40 V - supports wide-range unregulated inputs including 12 V/24 V industrial rails and automotive battery-supplied systems. |
| Adjustable Output Range | 1.23 V to 37 V - set externally via R1/R2 feedback divider; 1.23 V reference enables precise low-voltage outputs (e.g., 3.3 V, 5 V) with standard resistors. |
| Switching Frequency | 150 kHz (typ) - allows use of compact, low-cost 33 µH inductors and standard electrolytic capacitors while avoiding AM radio band interference. |
| Feedback Voltage | 1.23 V (nominal), ±4% tolerance - defines output accuracy baseline; actual VFB = 1.193–1.267 V over full temp/load range ensures predictable regulation. |
| Standby Quiescent Current | 80 µA (typ) - achieved via TTL-level ON/OFF pin; enables ultra-low-power shutdown in battery-backed or energy-sensitive systems. |
| Saturation Voltage | 1.5 V (typ) at 3.0 A - directly impacts dropout and efficiency; higher Vsat requires careful thermal design in high-VIN/low-VOUT cases. |
Pinout & Package
LM2596DSADJR4G is housed in a TO-220-5 (Case 314D) package with heatsink surface electrically connected to Pin 3 (GND). The lead bend configuration matches standard vertical mounting with tab-down orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Vin | Positive input supply | Accepts 4.5–40 V unregulated DC; requires low-ESR input capacitor (e.g., 100 µF) placed adjacent to minimize switching transients. |
| 2 - Output | Emitter of internal NPN switch | Drives inductor; saturation voltage ~1.5 V limits efficiency at high IOUT/low VOUT; PCB copper area must be minimized to reduce EMI coupling. |
| 3 - GND | Circuit ground reference | Common return for input/output paths and feedback network; requires single-point grounding near IC to avoid noise injection into error amplifier. |
| 4 - Feedback | Error amplifier input | High-impedance node (IB = 25–200 nA); connects to resistor divider (R1/R2) setting VOUT; sensitive to layout - keep traces short and away from noisy nodes. |
| 5 - ON/OFF | Logic-enable shutdown control | TTL-compatible: <1.6 V = ON, >2.2 V = OFF; draws only 15 µA (typ) when high; enables system-level power sequencing and low-power sleep modes. |
Key Features
| Feature | Design Value |
|---|---|
| Internal loop compensation | Eliminates need for external compensation components - reduces BOM count and simplifies design of stable 3.0 A buck converters. |
| Thermal shutdown + current limit | Self-protecting operation under overload or ambient overheating; prevents latch-up or permanent damage during fault conditions. |
| 150 kHz fixed-frequency oscillator | Predictable EMI profile and consistent filter design; avoids variable-frequency jitter issues seen in hysteretic controllers. |
| Moisture Sensitivity Level (MSL) 1 | Unlimited floor life at ≤30°C/60% RH - no baking required before reflow, supporting standard SMT assembly processes. |
| Pb-free packaging | RoHS-compliant construction (G suffix) - meets global environmental regulations without compromising thermal or electrical performance. |
Applications
| Industrial Power Supply | Embedded System Pre-regulator |
|---|---|
|
Use Scenario: Converting 24 V factory bus to 5 V/3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 5 V @ 3.0 A with minimal external components. Use Value: Replaces linear regulators to achieve >73% efficiency at 12 VIN/5 VOUT, reducing heat sink size and board space by >50%. |
Use Scenario: Generating intermediate 5 V rail from 12 V input to feed low-noise LDOs powering microcontroller cores and analog peripherals. IC Role / Device Role / Timing Role: High-current pre-regulator enabling efficient multi-rail power architecture with independent LDO post-regulation. Use Value: Delivers stable 5 V with <±0.4% line regulation (Figure 3), minimizing LDO dropout requirements and improving overall system PSRR. |
| On-Card DC-DC Conversion | Battery Charger Power Stage |
|
Use Scenario: Local 3.3 V generation on dense FPGA carrier boards where remote power delivery causes IR drop and noise. IC Role / Device Role / Timing Role: Point-of-load (POL) buck converter mounted adjacent to FPGA VCCINT rail. Use Value: Achieves <100 mV peak-to-peak output ripple (Figure 14) with 220 µF/35 V output capacitor - sufficient for FPGA core logic without additional filtering. |
Use Scenario: Charging 3-cell Li-ion packs (12.6 V max) from 19 V laptop adapters using constant-current/constant-voltage (CC/CV) control. IC Role / Device Role / Timing Role: Adjustable-output buck controller configured for 12.6 V CV stage with external current-sense and op-amp feedback. Use Value: Supports 3.0 A charging current with thermal foldback (TJ ≥150°C) - enables safe, reliable fast-charging without external thermal management circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-ADJ | Same silicon die, TO-220-5 package (Case 314B), identical electrical specs; differs only in lead bend (TV vs T suffix) and marking format. | No functional difference; suitable for same PCB footprints with minor mechanical fit verification. | Select LM2596T-ADJ if Case 314B lead form is required for existing mechanical constraints or legacy designs. |
| MP1584EN-LF-Z | 4 A rated, 1.5 MHz switching frequency, smaller DFN-8 package; requires external compensation and has different pinout. | Enables higher density and lower output ripple but demands more complex layout and stability analysis. | Choose MP1584EN-LF-Z only when board space is critical and 1.5 MHz operation justifies redesign effort and component requalification. |
Compared with LM2596T-ADJ, LM2596DSADJR4G offers identical regulation performance with verified Case 314D mechanical compatibility; versus MP1584EN-LF-Z, it trades higher frequency and current rating for proven simplicity, internal compensation, and TO-220 thermal robustness in cost-sensitive industrial applications.
Availability
LM2596DSADJR4G is available at Aetrix Electronics and suitable for industrial power supplies, embedded system pre-regulators, and on-card DC-DC conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for LM2596DSADJR4G 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The LM2596 series was designed as a cost-optimized, easy-to-use buck regulator family targeting mid-power industrial and embedded power conversion - emphasizing simplicity, reliability, and broad input voltage support without external compensation.
FAQ
What is the maximum input voltage rating for LM2596DSADJR4G?
The LM2596DSADJR4G has an absolute maximum supply voltage of 45 V, but its guaranteed operating range is 4.5 V to 40 V per the datasheet's Operating Ratings table. Exceeding 40 V may cause unpredictable behavior or reduced reliability, even if below the 45 V absolute maximum. Always maintain input within 40 V for full specification compliance in designs using LM2596DSADJR4G.
Does LM2596DSADJR4G require external compensation components?
No, LM2596DSADJR4G features internal loop compensation as stated in the datasheet's Features section and Figure 1 block diagram. This eliminates the need for external compensation capacitors or resistors, allowing stable 3.0 A buck operation with only five external components: input capacitor, output capacitor, inductor, catch diode, and feedback divider resistors - a key advantage of LM2596DSADJR4G over many competing controllers.
What is the typical quiescent current of LM2596DSADJR4G in active operation?
The LM2596DSADJR4G draws 5.0–10 mA quiescent current (IQ) during normal regulation, as specified in the Electrical Characteristics table on page 4 of the datasheet. This value excludes switching losses and represents the IC's internal bias current only - critical for estimating no-load power consumption in always-on systems powered by LM2596DSADJR4G.
Can LM2596DSADJR4G be used in negative-output (buck-boost) configurations?
Yes, the LM2596DSADJR4G datasheet explicitly lists "Positive to Negative Converter (Buck−Boost)" as an application on page 2. When wired in inverting topology, it generates regulated negative outputs (e.g., −5 V, −12 V) from positive inputs, leveraging the same internal switch and feedback architecture - though external component selection (e.g., diode polarity, capacitor ratings) must follow the inverting design guidelines in the datasheet.
What thermal resistance values apply to LM2596DSADJR4G in TO-220-5 package?
For LM2596DSADJR4G in Case 314D (TO-220-5), the datasheet specifies thermal resistance junction-to-case (RJC) as 5.0°C/W and junction-to-ambient (RJA) as 65°C/W with standard 1 in² copper pad. These values enable thermal calculation of maximum allowable power dissipation - for example, at 25°C ambient, 150°C max junction temperature permits ~1.92 W of dissipation before thermal shutdown activates in LM2596DSADJR4G.
LM2596DSADJR4G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- 3A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
LM2596DSADJR4G FAQ
1.How can I place an order for LM2596DSADJR4G through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2596DSADJR4G 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 LM2596DSADJR4G reliable?
The price and inventory of LM2596DSADJR4G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2596DSADJR4G is usually 5 days.
3.What payment methods are accepted for LM2596DSADJR4G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2596DSADJR4G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2596DSADJR4G?
LM2596DSADJR4G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2596DSADJR4G 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 LM2596DSADJR4G?
For technical support, including LM2596DSADJR4G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2596DSADJR4G requirements.
6.How does Aetrix verify that LM2596DSADJR4G is sourced from the original manufacturer or authorized distributors?
All LM2596DSADJR4G 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 LM2596DSADJR4G meets industry standards.
7.What is the process for return or replacement of LM2596DSADJR4G?
All LM2596DSADJR4G units undergo pre-shipment inspection (PSI). If there is an issue with LM2596DSADJR4G, 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 LM2596DSADJR4G part is unused and in its original packaging.
Return procedure for LM2596DSADJR4G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2596DSADJR4G 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
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…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
