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onsemi LM2595DSADJG
- Part No.:
- LM2595DSADJG
- Manufacturer:
- onsemi
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LM2595DSADJG.pdf
- Description:
- IC REG BUCK BOOST ADJ 1A D2PAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,620
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Product details
Overview
LM2595DSADJG from onsemi is a monolithic step-down switching regulator (buck converter) with 1.0 A output current capability, 150 kHz fixed-frequency operation, internal compensation, and adjustable output voltage from 1.23 V to 37 V. It integrates a power switch, oscillator, error amplifier, and protection circuitry in a D2PAK package, designed for high-efficiency DC-DC conversion in space-constrained industrial and embedded power supplies.
For engineers reviewing the LM2595DSADJG datasheet, pinout, applications, or equivalent options, key selection criteria include its guaranteed 1.0 A load current, wide 4.5–40 V input range, thermal shutdown and cycle-by-cycle current limiting, and TTL-compatible ON/OFF control with 50 µA standby current.
Technical Context
The LM2595DSADJG implements a voltage-mode controlled buck topology with an internal 150 kHz oscillator and integrated NPN power switch. Its feedback loop is internally compensated via the adjustable output configuration, requiring only two external resistors (R1, R2) to set VOUT = 1.23 V × (1 + R2/R1).
Protection architecture includes thermal shutdown triggered at TJ ≥ 150 °C and peak-current limiting at 1.15–2.6 A, with automatic frequency foldback to ~30 kHz during overload to reduce average dissipation. The ON/OFF pin accepts logic-level signals (VIL ≤ 0.8 V for "on", VIH ≥ 2.2 V for "off") and draws only 50 µA in shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 1.0 A continuous load current - supports single-rail microcontroller or FPGA core supply without external current boosting. |
| Input Voltage Range | 4.5 V to 40 V - enables direct regulation from 12 V/24 V industrial rails or unregulated AC-DC outputs. |
| Switching Frequency | 150 kHz (typ), 120–180 kHz (min–max) - allows use of compact 68 µH inductors and standard electrolytic input/output capacitors. |
| Feedback Reference Voltage | 1.23 V ±4% - sets precise output voltage via external resistor divider; enables 5 V, 3.3 V, or custom rail generation. |
| Standby Quiescent Current | 50 µA (typ) at VON/OFF = 5 V - ensures ultra-low system power consumption during sleep or standby modes. |
| Saturation Voltage | 1.0 V (typ) at IOUT = 1.0 A - defines minimum dropout (VIN − VOUT) required for regulation; impacts efficiency at low VOUT. |
| Thermal Resistance | RθJC = 5.0 °C/W - enables high-power dissipation when mounted to heatsink; RθJA = 70 °C/W (no heatsink). |
Pinout & Package
D2PAK (TO-263) package with exposed heatsink tab electrically connected to Pin 3 (GND). Heatsink surface must be soldered to PCB ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Emitter of internal NPN switch | Carries high di/dt switching current; requires minimal PCB copper area to reduce EMI coupling into sensitive analog sections. |
| 2 - Vin | Positive input supply | Must be bypassed with low-ESR capacitor (e.g., 220 µF/50 V) placed adjacent to pin to suppress input transients and supply switching current. |
| 3 - GND | Circuit ground reference | Single-point ground connection for feedback, ON/OFF, and heatsink; critical for stability and noise immunity. |
| 4 - Feedback | Error amplifier inverting input | High-impedance node (IB = 25–200 nA); must be routed short and away from noisy traces to avoid regulation drift. |
| 5 - ON/OFF | Logic-controlled enable/disable | TTL-compatible input (VIL ≤ 0.8 V = ON, VIH ≥ 2.2 V = OFF); pulls total supply current to ~50 µA in shutdown state. |
Key Features
| Feature | Design Value |
|---|---|
| Internal loop compensation | Eliminates need for external compensation network - reduces BOM count and design iteration time for standard buck applications. |
| Thermal shutdown + cycle-by-cycle current limit | Provides fault containment without external sensing - protects IC and downstream circuitry during overloads, shorts, or ambient overheating. |
| Adjustable output (1.23–37 V) | Supports flexible rail generation using only two precision resistors - avoids stocking multiple fixed-output variants. |
| Pb-free D2PAK package (MSL 1) | Enables lead-free reflow assembly without moisture sensitivity concerns - suitable for high-reliability industrial manufacturing. |
| 150 kHz fixed-frequency operation | Ensures predictable EMI profile and simplifies filter design - avoids variable-frequency jitter and associated layout complexity. |
Applications
| Industrial Power Supply | Embedded System Core Rail |
|---|---|
|
Use Scenario: Regulating 24 V factory bus down to 5 V for PLC I/O modules operating in ambient temperatures up to +70 °C. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 5 V @ 1.0 A with line/load regulation < ±1.5%. Use Value: Replaces linear regulators to achieve >81% efficiency at full load, reducing thermal load and eliminating need for heatsinks. |
Use Scenario: Generating 3.3 V core voltage for ARM Cortex-M7 MCU in battery-powered edge sensor node with sleep mode requirements. IC Role / Device Role / Timing Role: Adjustable buck converter enabling precise 3.3 V output with 1.23 V reference and shutdown control via MCU GPIO. Use Value: 50 µA standby current extends battery life; internal compensation accelerates schematic capture and layout verification. |
| On-Card DC-DC Converter | Battery Charger Pre-Regulator |
|
Use Scenario: Compact 12 V-to-5 V conversion on dense PCB with limited board area and no dedicated heatsink. IC Role / Device Role / Timing Role: Integrated buck solution with D2PAK thermal pad soldered directly to 2-oz copper ground plane. Use Value: RθJC = 5.0 °C/W enables 2.5 W dissipation without external heatsink; 150 kHz frequency permits small 68 µH inductor. |
Use Scenario: Pre-regulating 36 V Li-ion pack voltage to 12 V before linear charging IC in portable medical device. IC Role / Device Role / Timing Role: Efficient pre-regulator minimizing heat in final linear stage; ON/OFF pin synchronized to charge cycle controller. Use Value: Reduces power loss by >65% vs. linear pre-regulation; wide 4.5–40 V input accommodates full battery voltage range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ | Higher 3.0 A output current; 150 kHz switching; requires external compensation capacitor. | Preferred where >1.0 A load or higher efficiency at light loads is required; larger footprint (TO-263-5 vs. D2PAK-5). | Select LM2596S-ADJ if output current exceeds 1.0 A or if tighter load regulation (< ±0.5%) is needed across temperature. |
| MP1584EN-LF-Z | 2.5 A output; 1.5 MHz switching; requires external compensation; smaller SOIC-8 package. | Better suited for space-constrained designs needing higher frequency and lower output ripple; lacks integrated heatsink pad. | Choose MP1584EN-LF-Z when PCB area is critical and 1.5 MHz operation enables sub-10 µH inductors and ceramic output capacitors. |
Compared with LM2595DSADJG, LM2596S-ADJ offers higher current headroom and improved regulation but demands additional compensation components, while MP1584EN-LF-Z delivers miniaturization and higher frequency at the cost of thermal performance and simplified layout.
Availability
LM2595DSADJG is available at Aetrix Electronics and suitable for industrial power supplies, embedded system core rails, and on-card DC-DC converters requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for LM2595DSADJG 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 manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The LM2595 series was engineered as a cost-optimized, easy-to-use buck regulator family targeting non-critical industrial and consumer applications where simplicity, reliability, and thermal robustness outweigh ultra-high efficiency or ultra-small size.
FAQ
What is the maximum input voltage rating for the LM2595DSADJG?
The LM2595DSADJG has an absolute maximum input voltage rating of 45 V, with recommended operating range from 4.5 V to 40 V. Exceeding 40 V may reduce reliability and lifetime, especially under high ambient temperature or high load conditions. The device's internal protection does not guarantee safe operation beyond the 40 V operating limit specified in the datasheet.
Can the LM2595DSADJG be used to generate a 3.3 V output?
Yes, the LM2595DSADJG can generate a stable 3.3 V output using an external resistor divider on the Feedback pin. With VFB = 1.23 V, selecting R1 = 1.0 kΩ and R2 = 1.69 kΩ yields VOUT = 1.23 V × (1 + 1.69k/1.0k) ≈ 3.3 V. Use 1% metal film resistors for best temperature stability and regulation accuracy.
Does the LM2595DSADJG require an external compensation network?
No, the LM2595DSADJG features internal loop compensation optimized for standard buck configurations. No external compensation capacitor or resistor is needed - only the feedback resistor divider (R1, R2) and standard external components (inductor, catch diode, input/output capacitors) are required for full operation.
What is the purpose of the ON/OFF pin on the LM2595DSADJG?
Pin 5 (ON/OFF) provides logic-level enable/disable control for the LM2595DSADJG. Driving it below 0.8 V enables regulation; driving it above 2.2 V disables the internal switch and reduces total supply current to ~50 µA. This feature supports system-level power sequencing and low-power sleep states without removing input voltage.
How is thermal performance managed in the LM2595DSADJG D2PAK package?
The LM2595DSADJG D2PAK package includes an exposed heatsink tab electrically tied to Pin 3 (GND). For optimal thermal performance, this tab must be soldered to a large PCB copper area (≥ 2 in² of 2-oz copper) acting as a heatsink. With proper mounting, RθJC = 5.0 °C/W enables continuous 2.5 W dissipation without external heatsink.
LM2595DSADJG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 1A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-5
LM2595DSADJG FAQ
1.How can I place an order for LM2595DSADJG through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2595DSADJG 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 LM2595DSADJG reliable?
The price and inventory of LM2595DSADJG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2595DSADJG is usually 5 days.
3.What payment methods are accepted for LM2595DSADJG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2595DSADJG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2595DSADJG?
LM2595DSADJG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2595DSADJG 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 LM2595DSADJG?
For technical support, including LM2595DSADJG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2595DSADJG requirements.
6.How does Aetrix verify that LM2595DSADJG is sourced from the original manufacturer or authorized distributors?
All LM2595DSADJG 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 LM2595DSADJG meets industry standards.
7.What is the process for return or replacement of LM2595DSADJG?
All LM2595DSADJG units undergo pre-shipment inspection (PSI). If there is an issue with LM2595DSADJG, 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 LM2595DSADJG part is unused and in its original packaging.
Return procedure for LM2595DSADJG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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