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Texas Instruments LM61480RPHR
- Part No.:
- LM61480RPHR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerVFQFN
- Datasheet:
-
LM61480RPHR.pdf
- Description:
- IC REG BUCK ADJ 8A 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
LM61480RPHR from Texas Instruments is an 8-A synchronous buck converter optimized for high power density and low EMI in industrial and avionics systems. It operates from 3 V to 36 V input, delivers adjustable output from 1 V to 95% of VIN, supports pin-selectable 400 kHz / 2.2 MHz or 200–2200 kHz switching, and achieves 95% efficiency at full 8-A load with only 5 µA quiescent current in auto mode.
For engineers reviewing the LM61480RPHR datasheet, LM61480RPHR pinout, LM61480RPHR application, or LM61480RPHR equivalent, this page provides verified technical context, validated pin functions, confirmed EMI mitigation features (including DRSS spread spectrum and SW rise-time control), real-world thermal performance (RθJA = 21.6°C/W on EVM), and precise alternative selection guidance for 8-A buck replacement scenarios.
Technical Context
The LM61480RPHR implements a current-mode controlled synchronous buck architecture with integrated high-side (21 mΩ typical RDS(on)) and low-side (13 mΩ) MOSFETs, dual-random spread spectrum (±5.5% frequency hopping), and adjustable SW node slew rate via external RBOOT. Its functional safety-capable design includes RESET with filtered delay, thermal shutdown (158–180°C trip), and hiccup-mode overcurrent protection.
It supports three operating modes-auto (PFM/PWM transition), forced PWM, and external clock synchronization-via the MODE/SYNC pin, while RT pin sets switching frequency from 200 kHz to 2.2 MHz. The BIAS pin enables efficient biasing from output or external 3.3–12 V supply, reducing system-level power loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 3 V to 36 V continuous; withstands 42 V transients ≤100 ms - enables robust operation in automotive cranking and industrial line surges. |
| Output current rating | 8 A continuous - matches LM61480 variant designation; validated across –40°C to +150°C junction temperature. |
| Switching frequency | Pin-configurable: fixed 400 kHz or 2.2 MHz, or adjustable 200–2200 kHz via RT resistor - allows optimization for size (high-freq) or efficiency (low-freq). |
| Efficiency | 95.1% at 13.5 VIN/5 VOUT/8 A/400 kHz - reduces thermal load in dense PCB layouts without heatsinks. |
| Quiescent current | 5 µA in auto mode at no load - extends battery life in always-on industrial monitoring systems. |
| EMI features | Dual Random Spread Spectrum (DRSS), adjustable SW rise time, symmetrical wettable-flank QFN - CISPR 11/32 Class B compliant on reference EVM without shielding. |
| RESET output | Open-drain with 1.2–3.75 ms active delay and 92–96.5% UVLO hysteresis - provides reliable system power-good signaling with built-in filtering. |
Pinout & Package
LM61480RPHR uses a 4.5-mm × 3.5-mm VQFN-16 package with wettable flanks for optical solder inspection and enhanced board-level reliability (BLR). All pins are validated per TI SNVSBZ4A datasheet Rev. November 2021.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Connects to output inductor; high dv/dt node requiring tight layout and controlled rise time via RBOOT. |
| VIN1, VIN2 | Power inputs | Dual input pins reduce high-current path inductance; must be low-impedance connected and bypassed separately to PGND1/PGND2. |
| PGND1, PGND2 | Power ground returns | Separate low-side MOSFET ground paths; require direct, low-inductance connection to system ground and local bypass caps. |
| CBOOT, RBOOT | High-side gate drive supply & slew control | CBOOT supplies bootstrap rail; RBOOT (0–100 Ω) adjusts SW rise time to suppress EMI peaks. |
| FB | Feedback input | Senses output voltage; connects to divider tap (adjustable) or fixed-resistor network (3.3/5 V versions); 1% reference accuracy. |
| MODE/SYNC | Operation mode control | Selects auto (PFM/PWM), forced PWM, or external sync; rising-edge triggered for clock sync; internal 100-kΩ pulldown prevents floating. |
| RT | Frequency set | Resistor-to-GND (6.8–80 kΩ) sets 200–2200 kHz; tie to VCC for 400 kHz, GND for 2.2 MHz. |
| RESET | Open-drain power-good | Active-low signal with 10–45 µs deglitch and 1.2–3.75 ms release delay; indicates stable regulation after soft-start. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-configurable spread spectrum | DRSS modulation (±5.5% typical) with tone correction via SPSP pin - reduces peak radiated emissions by >10 dBµV/m without sacrificing output ripple. |
| Adjustable SW node rise time | RBOOT-controlled slew rate - enables fine-tuning of EMI profile while maintaining <100 ns minimum on-time for wide VIN/VOUT ratios. |
| Integrated protection suite | Thermal shutdown (158–180°C), hiccup-mode overcurrent, input UVLO (3.7 V start-up), and output overvoltage lockout - eliminates need for external supervision ICs. |
| Low-EMI symmetrical pinout | VIN/PGND pairs placed opposite SW and feedback nodes - minimizes loop area and common-mode noise generation in compact layouts. |
| Auto-mode light-load efficiency | 5 µA input current at zero load with seamless PFM-to-PWM transition - maintains regulation accuracy while minimizing standby power in PLC I/O modules. |
Applications
| Industrial Transport Power | Avionics DC-DC Conversion |
|---|---|
|
Use Scenario: Power conversion for engine control units (ECUs) and sensor hubs in rail and off-highway vehicles, exposed to 12–24 V battery variations and load-dump transients. IC Role / Device Role / Timing Role: Primary 8-A buck regulator delivering stable 3.3 V or 5 V from unregulated vehicle bus; handles 42 V transients without derating. Use Value: Built-in 42 V transient tolerance, thermal shutdown recovery at 150°C, and wettable-flank QFN ensure field reliability without external TVS or thermal margining. |
Use Scenario: Point-of-load regulation in flight data recorders and cockpit displays where EMI must meet DO-160 Section 20 Class A limits. IC Role / Device Role / Timing Role: Low-EMI 8-A buck supplying FPGA core voltage; uses DRSS and symmetrical layout to pass radiated emissions testing at 150 MHz–1 GHz. Use Value: CISPR 11/32 Class B compliance on reference EVM eliminates need for metal shielding cans or ferrite beads in space-constrained avionics enclosures. |
| Industrial PC Power Rails | PLC Analog I/O Module Supply |
|
Use Scenario: Generating 5 V/3.3 V rails for CPU peripherals and memory interfaces in fanless industrial PCs operating at 60°C ambient. IC Role / Device Role / Timing Role: High-density buck converter with 4.5 × 3.5 mm footprint; delivers 8 A with 21.6°C/W θJA on 4-layer board. Use Value: 95.1% efficiency at 400 kHz reduces heat dissipation below 1.5 W, enabling convection-only cooling in sealed enclosures. |
Use Scenario: Isolated analog front-end supply in programmable logic controller (PLC) modules requiring ultra-low noise and long-term stability. IC Role / Device Role / Timing Role: Adjustable-output buck providing precision 2.5 V or 3.3 V reference for ADC drivers; uses BIAS pin for low-noise biasing. Use Value: 1% FB reference accuracy over –40°C to +150°C and <2.5% total output error ensure consistent measurement accuracy across industrial temperature ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-A buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61495RPHR | 10-A rated; higher current limit (14–20 A short-circuit), larger RDS(on) (HS: 17 mΩ typ), identical pinout and feature set. | Used where future-proofing for >8 A loads or higher fault-current margin is required; same PCB layout but higher thermal mass needed. | Select LM61495RPHR only if system requires ≥10 A continuous output or enhanced overcurrent headroom; otherwise LM61480RPHR offers optimal cost/performance balance. |
| MPQ4420AGL-Z | Monolithic 8-A buck (MPS); 3.3–36 V input; fixed 500 kHz/2.2 MHz options; no spread spectrum; 12 µA IQ; 4×4 mm QFN-18. | Lacks DRSS, SW slew control, and RESET with delay; requires external reset IC for power sequencing; lower integration for EMI-sensitive designs. | Choose MPQ4420AGL-Z only for cost-sensitive, non-safety-critical applications where EMI is managed externally and RESET functionality is handled by system MCU. |
Compared with LM61495RPHR and MPQ4420AGL-Z, LM61480RPHR uniquely balances 8-A capability with industry-leading EMI suppression (DRSS + slew control), integrated RESET with delay, and ultra-low 5 µA quiescent current - making it the optimal choice for space-constrained, thermally limited, and EMI-regulated industrial and avionics designs.
Availability
LM61480RPHR is available at Aetrix Electronics and suitable for industrial transport power systems, avionics DC-DC conversion, and PLC analog I/O modules requiring stable component supply, long lifecycle support, and guaranteed traceability.
Supply support for LM61480RPHR 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 with decades of analog and power management innovation, serving industrial, automotive, and aerospace markets with high-reliability, application-optimized ICs.
The LM6x4xx product line was designed specifically for high-power-density, low-EMI buck conversion in harsh environments - targeting industrial automation, avionics, and test equipment where thermal, EMI, and functional safety constraints dominate design decisions.
FAQ
What is the maximum input voltage transient rating for LM61480RPHR?
The LM61480RPHR supports 42 V input transients for durations ≤100 ms at a duty cycle of ≤0.01%, as specified in Absolute Maximum Ratings. This enables robust operation during automotive load dump events without external clamping components. Continuous operation remains within 3 V to 36 V. The 42 V rating is validated per TI SNVSBZ4A datasheet Section 7.1.
Does LM61480RPHR support external clock synchronization?
Yes, LM61480RPHR supports external clock synchronization via the MODE/SYNC pin, which accepts rising-edge-triggered signals from 200 kHz to 2200 kHz. When synchronized, the internal RT-set frequency should be close to the external clock to avoid disturbances during clock enable/disable transitions. This feature is documented in Section 6 and Section 8.4 of the LM61480RPHR datasheet.
What is the purpose of the RBOOT pin on LM61480RPHR?
The RBOOT pin on LM61480RPHR connects to the CBOOT capacitor through an external resistor (0–100 Ω) to control the rise time of the SW node voltage. Slowing the SW edge reduces high-frequency EMI emissions without compromising minimum on-time performance. This function is explicitly defined in Table 6-1 and Section 8.3.7 of the LM61480RPHR datasheet.
Can LM61480RPHR operate with an output voltage lower than 1 V?
No, LM61480RPHR's adjustable output range is specified from 1 V to 95% of VIN per the device description and Section 7.3 Recommended Operating Conditions. The internal 1-V reference (VFB = 1.0 V ±1%) sets the lower bound; attempting sub-1-V outputs violates electrical specifications and is not supported by the feedback architecture.
How does the RESET output on LM61480RPHR behave during startup?
The RESET output on LM61480RPHR remains low until the output reaches 92–96.5% of the target voltage and remains stable for 1.2–3.75 ms, as defined by tRESET_ACT. It features built-in filtering (10–45 µs deglitch) and delayed release to prevent false resets during soft-start or line transients. This behavior is fully characterized in Section 7.5 and Figure 8-15 of the LM61480RPHR datasheet.
LM61480RPHR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-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:
- 8A
- Frequency - Switching:
- 400kHz, 2.2MHz, 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN-HR (4.5x3.5)
LM61480RPHR FAQ
1.How can I place an order for LM61480RPHR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM61480RPHR 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 LM61480RPHR reliable?
The price and inventory of LM61480RPHR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM61480RPHR is usually 5 days.
3.What payment methods are accepted for LM61480RPHR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM61480RPHR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM61480RPHR?
LM61480RPHR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM61480RPHR 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 LM61480RPHR?
For technical support, including LM61480RPHR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM61480RPHR requirements.
6.How does Aetrix verify that LM61480RPHR is sourced from the original manufacturer or authorized distributors?
All LM61480RPHR 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 LM61480RPHR meets industry standards.
7.What is the process for return or replacement of LM61480RPHR?
All LM61480RPHR units undergo pre-shipment inspection (PSI). If there is an issue with LM61480RPHR, 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 LM61480RPHR part is unused and in its original packaging.
Return procedure for LM61480RPHR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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