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Texas Instruments LM61440AANRJRR
- Part No.:
- LM61440AANRJRR
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerVFQFN
- Datasheet:
-
LM61440AANRJRR.pdf
- Description:
- IC REG BUCK ADJ 4A 14VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,319
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Product details
Overview
LM61440AANRJRR from Texas Instruments is a 3-V to 36-V, 4-A synchronous step-down DC-DC converter in a 4.0 mm × 3.5 mm VQFN-HR (14-pin) package, featuring ±1% output regulation accuracy, 41 mΩ high-side and 21 mΩ low-side MOSFET RDS(ON), and adjustable 200 kHz–2.2 MHz switching frequency. It delivers robust power for industrial CPU boards and USB Type-C PD supplies with 42-V transient tolerance and ultra-low EMI design.
For engineers reviewing the LM61440AANRJRR datasheet, LM61440AANRJRR pinout, LM61440AANRJRR application, or LM61440AANRJRR equivalent, key selection criteria include input surge resilience (42 V), light-load efficiency (7 µA no-load IQ), SW node rise time adjustability via RBOOT, PGOOD accuracy (±3% thresholds), and functional safety documentation support.
Technical Context
The LM61440AANRJRR implements peak-current-mode control with frequency foldback in Auto mode, enabling seamless PWM-to-PFM transition and 7 µA quiescent current at no load. Its dual VIN pins (VIN1/VIN2) and parallel input path minimize parasitic inductance, while the HotRod™-optimized VQFN-HR package suppresses switch-node ringing.
It integrates high- and low-side MOSFETs with typical RDS(ON) of 41 mΩ/21 mΩ, supports external bias for improved efficiency, and features programmable soft-start, thermal shutdown (158°C–180°C), and hiccup-mode overcurrent protection with 80-ms fault recovery timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 36 V continuous; withstands 42-V transients - simplifies input surge protection in industrial environments. |
| Output Current | Up to 4 A DC - supports demanding loads like SBC processors and USB-C sink circuits without derating at 25°C. |
| Switching Frequency | Adjustable 200 kHz to 2.2 MHz via RT pin - enables layout optimization: low fSW for efficiency, high fSW for compact magnetics. |
| Output Accuracy | ±1% total regulation - ensures stable voltage for sensitive logic rails and analog subsystems across –40°C to +150°C. |
| Quiescent Current | 7 µA at no load (Auto mode, VOUT = 3.3 V) - extends battery life in always-on industrial IoT nodes. |
| MOSFET RDS(ON) | HS: 41 mΩ, LS: 21 mΩ (typical) - reduces conduction loss and thermal stress under full 4-A load. |
| EMI Optimization | Adjustable SW rise time (via RBOOT), parallel VIN paths, and HotRod™ package - meets CISPR-25 Class 5 without shielding. |
Pinout & Package
Package: VQFN-HR (RJR), 14-pin, 4.00 mm × 3.50 mm, exposed thermal pad. Pinout validated per TI SNVSBD6C Rev C (June 2021) datasheet Figure 6-1 and Table 6-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BIAS (1) | Internal LDO input | Connect to VOUT to improve efficiency; tie to GND if VOUT > 12 V - enables bias supply optimization and noise immunity. |
| VCC (2) | Internal LDO output | Power source for internal control circuitry; requires 1-µF capacitor to AGND - must not drive external loads. |
| AGND (3) | Analog reference ground | Reference point for FB, VCC, and internal error amplifier - must be star-connected to PGND1/PGND2 to avoid noise coupling. |
| FB (4) | Feedback input | Connects to resistor divider tap; sets VOUT from 1 V to 95% of VIN - determines regulation setpoint with ±1% accuracy. |
| PGOOD (5) | Open-drain status output | Asserts high when VOUT is within ±3% of target; requires external pull-up - replaces external supervisor IC in space-constrained designs. |
| RT (6) | Frequency programming | Resistor to GND sets fSW (200 kHz–2.2 MHz); open or short invalid - enables precise EMI band avoidance and efficiency tuning. |
| EN/SYNC (7) | Enable & sync input | Rising-edge enable threshold 1.263 V; also accepts external clock for synchronization - supports system-level timing coordination and UVLO customization. |
| VIN1 (8), VIN2 (12) | Power inputs | Dual high-current inputs with parallel path - reduce PCB trace inductance and improve EMI performance vs. single-input buck converters. |
| PGND1 (9), PGND2 (11) | Power ground returns | Separate low-side MOSFET return paths - minimize ground bounce and enhance current-sense accuracy. |
| SW (10) | Switch node | Connects to output inductor; features adjustable rise time via RBOOT/CBOOT - critical for controlling EMI and minimizing ringing. |
| RBOOT (13) | SW rise-time control | Resistor between RBOOT and CBOOT adjusts dV/dt on SW node - allows trade-off between EMI reduction and efficiency. |
| CBOOT (14) | High-side gate driver supply | 100-nF capacitor to SW powers HS gate drive; internal diode charges from VCC - ensures reliable high-side switching across input range. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low EMI architecture | HotRod™ VQFN-HR package + parallel VIN paths + adjustable SW rise time - eliminates need for metal shields in automotive/industrial applications. |
| Functional safety support | Documentation available for ISO 26262 ASIL-B system integration - enables use in safety-critical industrial robot controllers and test equipment. |
| Wide input surge tolerance | 42-V absolute max rating - withstands load-dump transients without external TVS, reducing BOM count in 24-V systems. |
| Scalable pin compatibility | Same footprint as LM61440-Q1 and LM61460 - allows hardware reuse across 4-A and 6-A power tiers with minimal layout changes. |
| Light-load efficiency | 7 µA no-load IQ + Auto-mode frequency foldback - maintains >70% efficiency at 1-mA load, ideal for always-on sensor nodes. |
Applications
| Industrial Robot CPU Board | USB Type-C Power Delivery |
|---|---|
Use Scenario: Powers ARM-based motion controller SoC requiring clean, regulated 3.3 V/1.8 V rails with fast transient response during servo actuation. IC Role / Device Role / Timing Role: Primary 4-A buck regulator delivering core logic voltage; handles 2-A load steps with <1% output deviation due to tight regulation and low dropout. Use Value: ±1% accuracy and 42-V surge tolerance ensure deterministic operation during motor commutation spikes and field wiring faults. | Use Scenario: Implements fixed 5-V or programmable 9/15/20-V output in USB-C PD sink adapters for industrial handheld tools. IC Role / Device Role / Timing Role: Main DC-DC stage converting 9–20 V PD input to stable system rail; synchronized to host controller clock via EN/SYNC pin. Use Value: Adjustable fSW avoids AM-band interference, while PGOOD replaces discrete reset IC - reducing solution size by 30%. |
| Industrial PC (SBC) | Test & Measurement Instrumentation |
Use Scenario: Supplies 12-V auxiliary rail and 3.3-V I/O rail for fanless single-board computers operating in wide-temperature enclosures. IC Role / Device Role / Timing Role: Dual-output capable (with external feedback resistors); operates from 24-V bus with 42-V transient headroom during hot-swap events. Use Value: 150°C max junction temperature and –40°C to +150°C spec range enable deployment in uncooled DIN-rail cabinets. | Use Scenario: Powers precision ADC/DAC signal chains and FPGA configuration rails in portable oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Low-noise, low-EMI 4-A supply for analog front-end; uses BIAS pin connection to reduce output ripple below 10 mVpp. Use Value: Adjustable SW rise time and optimized pinout suppress conducted emissions - helps meet CISPR-32 Class B limits without ferrite beads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61440-Q1AANRJRR | Automotive-grade variant (AEC-Q100 qualified); identical electrical specs and pinout; enhanced screening and qualification testing. | Required for automotive ADAS ECUs and infotainment systems where qualification to automotive standards is mandatory. | Select LM61440-Q1AANRJRR only when AEC-Q100 compliance is contractually required; otherwise LM61440AANRJRR offers identical performance at lower cost. |
| LM61460AANRJRR | 6-A rated version; same package, pinout, and feature set; higher RDS(ON) (HS: 32 mΩ, LS: 16 mΩ) and slightly higher IQ (9 µA). | Suitable for future-proofing or higher-current derivatives (e.g., 5-A SBC designs) without PCB redesign. | Choose LM61460AANRJRR when peak load exceeds 4.5 A or when designing scalable platforms; LM61440AANRJRR remains optimal for cost-sensitive 4-A applications. |
Compared with LM61440-Q1AANRJRR and LM61460AANRJRR, the LM61440AANRJRR provides the best balance of cost, thermal performance, and efficiency for industrial 4-A applications - offering identical EMI performance and pin compatibility without automotive qualification overhead or unnecessary current headroom.
Availability
LM61440AANRJRR is available at Aetrix Electronics and suitable for industrial robot CPU boards, USB Type-C power delivery adapters, and test & measurement instrumentation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM61440AANRJRR 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 and embedded processing technologies, with decades of expertise in power management ICs for industrial, automotive, and communications markets.
The LM61440AANRJRR belongs to TI's LM61xxx family of low-EMI, high-efficiency synchronous buck converters - designed specifically for rugged industrial applications demanding reliability, small solution size, and regulatory-compliant emissions performance.
FAQ
What is the maximum input voltage the LM61440AANRJRR can withstand without damage?
The LM61440AANRJRR has an absolute maximum input voltage rating of 42 V across VIN1 and VIN2 pins relative to AGND/PGND. This allows it to survive common industrial transients such as 24-V system load dumps without external protection components. Operation above 36 V is not recommended for continuous use, but the 42-V rating provides critical margin during fault conditions. Always refer to Section 7.1 Absolute Maximum Ratings in the official LM61440AANRJRR datasheet for full stress limits.
Does the LM61440AANRJRR support synchronization to an external clock?
Yes, the LM61440AANRJRR supports external clock synchronization via its EN/SYNC pin (Pin 7). When an external clock signal with ≥2.4 V edge height and <30 ns rise/fall time is applied, the device locks its switching frequency to that clock and operates in forced PWM mode. This disables Auto-mode frequency foldback but enables precise system-level timing coordination. The LM61440AANRJRR datasheet specifies synchronization frequency range as 200 kHz to 2.2 MHz, matching its internal RT-programmable range.
How does the BIAS pin improve efficiency in the LM61440AANRJRR?
The BIAS pin (Pin 1) on the LM61440AANRJRR connects to the output voltage to power the internal LDO that supplies the control circuitry. When VOUT ≤ 12 V, connecting BIAS to VOUT reduces internal power dissipation and improves full-load efficiency by up to 1.5%. If VOUT > 12 V, BIAS must be tied to AGND to prevent overvoltage on the internal LDO. This feature is documented in the LM61440AANRJRR datasheet Section 6 Pin Functions and Section 8.3.2.
What thermal performance can be expected from the LM61440AANRJRR in a standard 4-layer PCB layout?
In a JEDEC-standard 4-layer PCB layout, the LM61440AANRJRR (RJR package) achieves a junction-to-ambient thermal resistance (RθJA) of 58.7°C/W. With proper thermal vias under the exposed pad, real-world designs achieve ~25°C/W, allowing 4-A continuous operation at ambient temperatures up to 85°C without forced airflow. Thermal metrics are specified in Section 7.4 of the LM61440AANRJRR datasheet, and layout guidelines are detailed in Section 11.
Is the LM61440AANRJRR pin-compatible with other devices in the LM61xxx family?
Yes, the LM61440AANRJRR is pin-compatible with the LM61440-Q1AANRJRR (automotive grade) and LM61460AANRJRR (6-A version), sharing identical VQFN-HR (RJR) 14-pin footprints and pin functions. This enables direct hardware reuse across industrial, automotive, and higher-current variants. However, note that LM61460AANRJRR has different current-limit thresholds and slightly higher quiescent current - verify system-level performance before substitution. Confirmed in TI's LM61440 datasheet Section 1 Device Information and Section 5 Device Comparison Table.
LM61440AANRJRR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-PowerVFQFN
- 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):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 4A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 14-VQFN-HR (4x3.5)
LM61440AANRJRR FAQ
1.How can I place an order for LM61440AANRJRR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM61440AANRJRR 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 LM61440AANRJRR reliable?
The price and inventory of LM61440AANRJRR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM61440AANRJRR is usually 5 days.
3.What payment methods are accepted for LM61440AANRJRR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM61440AANRJRR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM61440AANRJRR?
LM61440AANRJRR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM61440AANRJRR 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 LM61440AANRJRR?
For technical support, including LM61440AANRJRR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM61440AANRJRR requirements.
6.How does Aetrix verify that LM61440AANRJRR is sourced from the original manufacturer or authorized distributors?
All LM61440AANRJRR 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 LM61440AANRJRR meets industry standards.
7.What is the process for return or replacement of LM61440AANRJRR?
All LM61440AANRJRR units undergo pre-shipment inspection (PSI). If there is an issue with LM61440AANRJRR, 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 LM61440AANRJRR part is unused and in its original packaging.
Return procedure for LM61440AANRJRR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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