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Texas Instruments LM60440DRPKR
- Part No.:
- LM60440DRPKR
- Manufacturer:
- Texas Instruments
- Package:
- 13-PowerWFQFN
- Datasheet:
-
LM60440DRPKR.pdf
- Description:
- IC REG BUCK ADJ 4A 13WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,920
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Product details
Overview
LM60440DRPKR from Texas Instruments is a 3.8-V to 36-V, 4-A synchronous step-down DC/DC converter in a 3.0 mm × 2.0 mm WQFN-13 package with wettable flanks. It delivers peak efficiency >95% at 12 VIN/5 VOUT, operates at 1 MHz switching frequency, and features integrated high- and low-side MOSFETs (RDS(on) = 76 mΩ / 51 mΩ) for industrial power rails in servo drives and PLC controllers.
For engineers reviewing the LM60440DRPKR datasheet, LM60440DRPKR pinout, LM60440DRPKR application, or LM60440DRPKR equivalent, key selection considerations include its 1-MHz fixed-frequency operation, 25 µA quiescent current in light-load PFM mode, thermal shutdown at 165°C, and compatibility with adjustable output voltages from 1 V to 24 V using external feedback resistors.
Technical Context
The LM60440DRPKR uses peak-current-mode control with automatic PWM-to-PFM transition to maintain >90% efficiency at 10 mA (12 VIN/5 VOUT). Its internal 5-V LDO powers control circuitry and supports PG flag logic, while zero-current detection enables diode emulation for discontinuous conduction mode at light loads.
This device integrates high-side and low-side MOSFETs with matched RDS(on) values, employs a thermally enhanced WQFN package with DAP-connected PGND for 24.2°C/W junction-to-case (bottom) resistance, and implements hiccup-mode short-circuit protection triggered when FB falls below 0.4 V for 94 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.8 V to 36 V - supports wide industrial input rails including 12 V, 24 V, and 36 V systems without pre-regulation. |
| Output Current | 0 A to 4 A - rated continuous load capability with 4.7–6 A high-side current limit and 4–4.9 A low-side current limit. |
| Switching Frequency | 1 MHz (±15%) - enables compact magnetics and reduces output ripple; fixed-frequency operation avoids audible noise. |
| Feedback Reference | 1.0 V ±15 mV - precise voltage reference enabling ±1.6% output regulation over full temperature and load range. |
| Quiescent Current | 25 µA - ultra-low operating IQ extends battery life in always-on industrial sensors and remote I/O modules. |
| Thermal Shutdown | 165°C shutdown / 148°C recovery - protects against sustained overload or poor PCB thermal design in enclosed enclosures. |
| Power-Good Accuracy | ±2% window (90–110% of VFB) - ensures reliable system reset timing during brownout or startup conditions. |
Pinout & Package
LM60440DRPKR is housed in a 3.00 mm × 2.00 mm WQFN-13 package with wettable flanks and an exposed thermal pad (DAP) connected to PGND for optimal heat dissipation. The package supports standard QFN reflow profiles and enables automated optical inspection (AOI) of solder joints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11 (PGND) | Power ground | Primary return path for high-current switch node; must connect directly to system ground plane with low-inductance traces. |
| 2, 10 (VIN) | Input supply | Accepts 3.8–36 V input; requires local 10-µF ceramic capacitor placed adjacent to pins 2 and 10 for EMI suppression. |
| 3, 12 (SW) | Switch node | Connects to power inductor; pin 3 provides simplified CBOOT-to-SW routing on PCB layout. |
| 4 (BOOT) | Bootstrap supply | Requires 100-nF ceramic capacitor to SW; enables high-side gate drive without external charge pump. |
| 5 (VCC) | Internal LDO output | 5-V regulated supply for control logic; not for external loading-must decouple with 1-µF capacitor to AGND. |
| 6 (AGND) | Analog ground | Reference for FB, EN, and PG; separate from PGND but tied to system ground at single point near DAP. |
| 7 (FB) | Feedback input | Monitors output via resistor divider; 1.0-V reference sets VOUT = 1.0 × (1 + RFBT/RFBB). |
| 8 (PG) | Open-drain power-good | Asserts high when VOUT is within ±2% of target; requires external pull-up resistor (e.g., 100 kΩ to VOUT). |
| 9 (EN) | Enable input | Logic-level control: ≥1.231 V enables regulation; hysteresis prevents chatter near threshold. |
| 13 (DAP) | Thermal pad / PGND | Low-impedance thermal path to PCB ground plane; must be soldered with ≥6 thermal vias for 15.3°C/W RθJB. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small WQFN-13 package | 3.0 mm × 2.0 mm footprint with wettable flanks enables <100-mm² total solution size for space-constrained PLC I/O modules. |
| 1-MHz fixed-frequency operation | Reduces inductor size by ~50% vs. 400-kHz variants; maintains stable loop response without frequency dithering. |
| Integrated MOSFETs with low RDS(on) | 76 mΩ (HS) / 51 mΩ (LS) minimizes conduction loss at 4-A load, supporting >95% peak efficiency at 12 VIN/5 VOUT. |
| PFM/PWM auto-mode transition | Maintains >90% efficiency down to 10 mA load via diode emulation, eliminating need for external bypass FETs. |
| Functional safety documentation support | Includes FIT rate data, failure mode analysis, and diagnostic coverage reports for ISO 13849 and IEC 61508 compliance. |
| Enhanced EMI performance | Meets CISPR-22 Class B (500 kHz–30 MHz) without shielding due to symmetrical VIN/PGND layout and minimized switch-node ringing. |
Applications
| Industrial PLC Power Rail | Servo Drive Auxiliary Supply |
|---|---|
|
Use Scenario: Provides clean 5-V or 3.3-V bias for microcontroller, FPGA, and isolated communication interfaces in modular PLC backplanes. IC Role / Device Role / Timing Role: Primary buck regulator delivering 4-A continuous current with tight output regulation (<±1.6%) across –40°C to +125°C ambient. Use Value: Eliminates need for external LDO post-regulation due to low output ripple (<10 mVPP) and fast transient response (<50 µs to settle after 2-A step). |
Use Scenario: Generates isolated 15-V gate drive supply and 5-V logic rail for IGBT/SiC driver stages in AC servo inverters. IC Role / Device Role / Timing Role: High-efficiency intermediate bus converter stepping down 24-V or 36-V DC bus to multiple regulated outputs. Use Value: 1-MHz operation allows use of 2.2-µH inductors, reducing magnetic volume by 40% vs. 400-kHz alternatives while maintaining <150-mV dropout at full load. |
| Medical Instrumentation Bias | Automated Test Equipment (ATE) Sequencing |
|
Use Scenario: Powers analog front-end amplifiers, ADCs, and precision references in portable ultrasound and patient monitors. IC Role / Device Role / Timing Role: Low-noise, low-IQ buck converter with soft-start (4.4-ms typical) preventing inrush-induced sensor offset drift. Use Value: 25-µA quiescent current extends battery runtime in handheld diagnostics; PG flag synchronizes system boot sequence with analog subsystem readiness. |
Use Scenario: Supplies configurable 1.2-V to 12-V rails for FPGA configuration, DAC biasing, and relay driver circuits in modular ATE chassis. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with EN-controlled sequencing and power-good flag for multi-rail power-up coordination. Use Value: Adjustable VOUT (1–24 V) via external resistors enables single BOM for multiple test head configurations; hiccup-mode protection prevents damage during probe short events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM60440ARPKR | Same WQFN-13 package and 4-A rating, but 400-kHz switching frequency and lower peak efficiency at high frequency. | Better suited for noise-sensitive audio or RF subsystems where 400-kHz fundamental harmonics fall outside critical bands. | Select LM60440ARPKR when EMI filtering simplicity outweighs board area savings from smaller magnetics. |
| TPS544B20RNVR | 4-A, 1.5-MHz buck with PMBus interface, higher RDS(on) (10.5 mΩ HS), and 12-bit VID programming-no internal compensation. | Targets digitally controlled power systems requiring telemetry, margining, and dynamic voltage scaling. | Choose TPS544B20RNVR only if digital monitoring, fault logging, or adaptive voltage positioning are required. |
Compared with LM60440ARPKR and TPS544B20RNVR, the LM60440DRPKR offers optimal balance of minimal solution size (enabled by 1-MHz operation), self-contained analog control (no external compensation needed), and industrial-grade thermal robustness (150°C TJ max), making it ideal for cost-sensitive, space-constrained embedded power rails.
Availability
LM60440DRPKR is available at Aetrix Electronics and suitable for industrial PLC controllers, servo drive auxiliary supplies, and medical instrumentation bias rails requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LM60440DRPKR 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 ICs, with decades of expertise in high-reliability industrial and automotive power solutions.
The LM604x0 family was designed specifically for rugged industrial DC/DC conversion-emphasizing small size, low EMI, wide input range, and extended temperature operation in harsh environments like factory automation and motor control.
FAQ
What is the maximum input voltage rating for the LM60440DRPKR?
The LM60440DRPKR has an absolute maximum input voltage rating of 38 V, with recommended operating input voltage ranging from 3.8 V to 36 V. Operation above 36 V is not advised for long-term reliability, and the device enters undervoltage lockout below 3.8 V. This range makes the LM60440DRPKR suitable for 24-V industrial buses and 36-V solar-powered equipment.
Does the LM60440DRPKR require external compensation components?
No, the LM60440DRPKR features internal loop compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies PCB layout, reduces bill-of-materials count, and accelerates design validation-particularly valuable in time-constrained industrial development cycles where the LM60440DRPKR is commonly deployed.
How does the power-good (PG) flag behave during startup of the LM60440DRPKR?
The LM60440DRPKR's open-drain PG pin remains low for approximately 4 ms after EN is asserted, then transitions high once VOUT reaches 90–95% of target and remains stable for >170 µs. During faults-including thermal shutdown, current limit, or EN deactivation-the PG pin pulls low immediately. This behavior ensures deterministic system reset sequencing in applications relying on the LM60440DRPKR for critical bias rails.
Can the LM60440DRPKR operate in forced PWM mode, or is PFM automatic?
The LM60440DRPKR operates exclusively in auto-mode, automatically transitioning between PWM (heavy load) and PFM with diode emulation (light load). There is no pin or register to force continuous PWM. This architecture ensures optimal efficiency across the full 0–4-A load range without user intervention-making the LM60440DRPKR especially effective in variable-duty-cycle industrial sensors and I/O modules.
What thermal management practices are recommended for the LM60440DRPKR in high-ambient environments?
For reliable operation above 85°C ambient, the LM60440DRPKR requires its DAP thermal pad to be soldered to a minimum 100-mm² copper pour with ≥6 thermal vias (0.3-mm diameter) connecting to inner ground planes. With this layout, the device achieves RθJB = 15.3°C/W, allowing 4-A operation up to +125°C ambient at 12 VIN/5 VOUT. Derating curves in the LM60440DRPKR datasheet must be consulted for specific conditions.
LM60440DRPKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 13-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.8V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 4A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 13-WQFN-HR (3x2)
LM60440DRPKR FAQ
1.How can I place an order for LM60440DRPKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM60440DRPKR 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 LM60440DRPKR reliable?
The price and inventory of LM60440DRPKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM60440DRPKR is usually 5 days.
3.What payment methods are accepted for LM60440DRPKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM60440DRPKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM60440DRPKR?
LM60440DRPKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM60440DRPKR 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 LM60440DRPKR?
For technical support, including LM60440DRPKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM60440DRPKR requirements.
6.How does Aetrix verify that LM60440DRPKR is sourced from the original manufacturer or authorized distributors?
All LM60440DRPKR 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 LM60440DRPKR meets industry standards.
7.What is the process for return or replacement of LM60440DRPKR?
All LM60440DRPKR units undergo pre-shipment inspection (PSI). If there is an issue with LM60440DRPKR, 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 LM60440DRPKR part is unused and in its original packaging.
Return procedure for LM60440DRPKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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