LM61440AANRJRR - 4A Low-EMI Buck Converter | Texas Instruments
MPN: LM61440AANRJRR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.9706 | $2.97 |
| 10 | $2.9706 | $29.71 |
| 100 | $2.9706 | $297.06 |
| 500 | $2.9706 | $1,485.30 |
| 1,000 | $2.9706 | $2,970.60 |
LM61440AANRJRR Overview
Drop-in alternatives for LM61440AANRJRR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LM61440AANRJRR (same form factor and footprint) — differing in Dropout Behavior, Input Voltage Range, Output Voltage, Package, Topology.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM61440AANRJRR
✅ Drop-In✓ In Stock
$2.9706 / Unit
View Datasheet →LM61440AASQRJRRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
LM61440AANRJRR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.9706 / Unit
View Datasheet →LM61440AASRJRR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LM61440AANRJ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LM61440AANRJRR Maximum Ratings & Electrical Characteristics
| Input Voltage Range | 3 V to 36 V |
| Transient Input Tolerance | 42 V |
| Output Current | 4 A |
| Output Voltage | 1 V minimum, adjustable |
| Switching Frequency | 2.2 MHz |
| Topology | Synchronous step-down converter |
| Integrated Power Devices | Integrated high-side and low-side MOSFETs |
| Dropout Behavior | Soft recovery from dropout |
| Output Configuration | Positive, adjustable, single output |
| EMI | Low-EMI design |
| Operating Junction Temperature | -40 °C to +150 °C |
| Package | 14-pin PowerVQFN |
| Mounting Type | Surface mount |
| Application | Low-EMI low-noise power conversion |
| Exposed Thermal Pad | Present in PowerVQFN package |
LM61440AANRJRR 14-pin powervqfn Pin Configuration Guide
Pin configuration for LM61440AANRJRR (14-pin powervqfn package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for LM61440AANRJRR.
Refer to the datasheet for full pin configuration.
Typical Applications
LM61440AANRJRR is suitable for 8 applications: Industrial 24 V Power Rail, Communications Equipment Power Supply, Audio and Analog Signal-Chain Supply, Embedded Computing and Processor Rail, Test and Measurement Front End, Battery-Powered and Portable Systems, LED and Display Backlight Systems, Automotive and Rugged Embedded Systems.
Industrial 24 V Power Rail
The LM61440AANRJRR is suitable for regulating a 24 V industrial input into a lower voltage rail for sensors, controllers, and communications equipment. Its 3 V to 36 V operating range covers the nominal bus, while the stated 42 V transient tolerance provides useful surge margin. With integrated high-side and low-side MOSFETs, the converter simplifies the power stage. The 4 A rating can support moderate loads, but the inductor, output capacitors, thermal design, and input protection must be selected for the actual transient profile.
Recommended
Communications Equipment Power Supply
For communications equipment, the LM61440AANRJRR provides a compact synchronous step-down stage with adjustable output down to 1 V and up to 4 A of nominal output current. The integrated MOSFETs reduce external component count, while the 2.2 MHz switching frequency supports compact magnetics and capacitors. Its low-EMI architecture is useful when converter switching could interfere with nearby signal processing. Proper input filtering, ground-plane planning, and output-decoupling layout remain necessary for system-level EMI performance.
Recommended
Audio and Analog Signal-Chain Supply
The LM61440AANRJRR can generate a local low-voltage rail for audio, ADC, DAC, or other analog signal-chain blocks. Its low-EMI synchronous architecture is intended to reduce switching-related interference, and the adjustable output allows the rail to be matched to the downstream device. Because DC-DC converters can still produce conducted and radiated emissions, place the input and output capacitors close to their pins and keep the high-current switching loop small. The final noise performance depends on layout, filtering, and the selected passives.
Recommended
Embedded Computing and Processor Rail
The LM61440AANRJRR is suitable for intermediate processor, FPGA, or embedded-computing rails where the input bus is above the required core voltage. Its 3 V to 36 V input range supports common 5 V, 12 V, and 24 V distribution systems, while the adjustable output and 4 A capability provide flexibility for multiple loads. Designers should calculate voltage-drop and power loss across the inductor and PCB copper, and verify transient response against the processor load profile. The synchronous topology helps improve efficiency compared with a basic diode rectifier when operating conditions are suitable.
Recommended
Test and Measurement Front End
The LM61440AANRJRR is appropriate for local rails in test and measurement equipment where compact conversion and controlled EMI are important. The 2.2 MHz switching frequency enables small passive components, and the integrated MOSFETs simplify the converter implementation. A low-noise supply helps preserve measurement integrity, but the regulator should still be paired with appropriate filtering and an analog-friendly reference point. Verify output ripple, load-transient response, and thermal performance under worst-case laboratory conditions before production.
Recommended
Battery-Powered and Portable Systems
Although the LM61440AANRJRR is not a dedicated battery charger, it can regulate a suitable protected battery or system input into a lower rail for portable electronic equipment. Its wide input range supports multiple source voltages, and the adjustable output allows local rails to be tailored to processors, radios, or sensors. The 4 A capability is useful for compact compute loads, while the low-EMI design helps reduce interference in radio-adjacent equipment. Designers must add the required battery protection, load-sharing, and power-path circuitry; the converter alone does not provide complete battery management.
Recommended
LED and Display Backlight Systems
The LM61440AANRJRR can serve as a buck-conversion stage in display backlight or LED systems when the input voltage and output requirements match its operating limits. The adjustable output down to 1 V provides flexibility for different LED-string and driver architectures, while the synchronous power stage can improve conversion efficiency. LED systems impose strict current regulation and transient requirements, so the LM61440 should be paired with a suitable LED driver or constant-current control stage. Confirm LED current limits, dimming behavior, and thermal margins in the complete design.
Recommended
Automotive and Rugged Embedded Systems
The LM61440 family’s wide input range and low-EMI synchronous architecture can be useful in rugged embedded systems, although the exact LM61440AANRJRR ordering variant must be checked for automotive qualification before use in vehicle applications. The 42 V transient tolerance may help with protected input networks, but external protection and filtering are still required. For non-automotive industrial, robotics, or transportation equipment, the device can support compact intermediate rails with up to 4 A nominal output current when thermal and transient requirements are met.
Recommended
Recommended Products Summary
Engineering reference data for LM61440AANRJRR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM61440AANRJRR | LM61440AASQRJRRQ1 | LM61440AANRJRR | LM61440AASRJRR | LM61440AANRJ |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
Key Differentiators
- Wide input range with transient tolerance (vs Typical lower-voltage buck converters)
- Integrated synchronous power stage (vs Discrete MOSFET buck designs)
- Compact high-frequency conversion (vs Lower-frequency high-current regulators)
- Low-EMI design focus (vs Standard switching regulators without explicit low-EMI optimization)
Design Notes
Place the input capacitor, high-side MOSFET, low-side MOSFET, inductor, and output capacitor in the smallest practical switching loop. The LM61440AANRJRR is designed for low-EMI operation, but layout still determines how much conducted and radiated noise reaches the system. Follow the TI datasheet power-layout guidance, provide a continuous ground path, and keep sensitive signal traces away from the switching node. The 14-pin PowerVQFN exposed pad must be connected according to the manufacturer layout requirements.
Calculate conduction and switching losses using the actual input voltage, output voltage, load current, switching frequency, and selected inductor. Estimated: with VIN = 24 V, VOUT = 5 V, and IOUT = 4 A, the ideal conversion difference is 19 V × 4 A = 76 W before efficiency losses, so this operating point requires substantial thermal analysis and is not appropriate without an appropriate inductor and board design. Use the TI thermal information and exposed-pad layout guidance, and measure junction temperature in the final assembly.
Validate the inductor current rating, saturation current, output capacitance, and feedback divider against the required 4 A load and output-voltage tolerance. The 1 V minimum adjustable output does not mean every external component value is interchangeable across designs. Use the LM61440 datasheet’s recommended compensation and compensation-network procedure, account for ESR and temperature variation, and verify startup behavior at the minimum and maximum input voltages. Confirm the device’s soft-recovery behavior in the complete load-step test.
Compliance Information
The supplied verified web results identify the product and its electrical highlights but do not provide verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. Automotive qualification must be checked for the exact ordering suffix.
