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Texas Instruments LMR51460SQDRRRQ1
- Part No.:
- LMR51460SQDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR51460SQDRRRQ1.pdf
- Description:
- IC REG BUCK ADJ 6A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,257
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Product details
Overview
LMR51460SQDRRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 6A continuous output current with 4V–36V input range, ±1.0% reference voltage accuracy at 25°C, and 25µA quiescent current in PFM mode - deployed in ADAS power rails and infotainment head units.
For engineers reviewing the LMR51460SQDRRRQ1 datasheet, LMR51460SQDRRRQ1 pinout, LMR51460SQDRRRQ1 application, or LMR51460SQDRRRQ1 equivalent, key selection criteria include its 75ns minimum on-time, WSON-12 package thermal resistance (RθJA = 47.4°C/W), spread-spectrum switching, and precision enable with adjustable UVLO functionality.
Technical Context
The LMR51460SQDRRRQ1 employs fixed-frequency peak-current mode control with internal compensation and supports both PFM (high light-load efficiency) and FPWM (constant frequency, low ripple) operation modes. Its architecture integrates high-side (78mΩ) and low-side (45mΩ) MOSFETs, enabling synchronous rectification without external diodes.
It implements frequency foldback below 200kHz to maintain regulation at extreme duty cycles, uses a precision 0.8V feedback reference with ±1.0% tolerance at 25°C, and features cycle-by-cycle current limiting with hiccup-mode short-circuit protection - all validated for –40°C to +125°C ambient operation per AEC-Q100 Grade 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports direct connection to automotive battery (cold-crank down to 4V) and 24V industrial rails. |
| Output Current | 6A continuous - sustains full load under 125°C ambient with proper PCB copper area and thermal vias. |
| Quiescent Current | 25µA (non-switching, PFM variant) - enables >10-year battery standby in always-on vehicle modules. |
| Reference Accuracy | ±1.0% at 25°C - ensures tight output regulation across temperature without external trimming. |
| Min. On-Time | 75ns typical - enables high VIN-to-low VOUT conversion (e.g., 24V→3.3V) without frequency foldback at 400kHz. |
| Switching Frequency | 200kHz–1MHz (adjustable via RT resistor) - allows trade-off between EMI filtering size and efficiency. |
| Thermal Resistance | RθJA = 47.4°C/W (WSON-12) - requires ≥4 cm² 2-oz copper pad with 8+ thermal vias for 6A full-load operation. |
Pinout & Package
LMR51460SQDRRRQ1 is housed in a thermally enhanced 3mm × 3mm WSON-12 package (DRR) with exposed thermal pad (PGND/DAP) for optimal heat dissipation in space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2,3) | Power switch node | Connects to inductor; carries high di/dt switching current - requires short, wide trace and local ground return. |
| BOOT (4) | High-side gate driver supply | Requires 100nF X7R ceramic capacitor to SW; critical for reliable high-side FET turn-on above 10V. |
| PG (5) | Open-drain power-good flag | Asserts low if FB voltage deviates >12% from target; needs 10kΩ–100kΩ pull-up to logic rail ≤20V. |
| RT (6) | Frequency programming input | Resistor to AGND sets fSW: 34.8kΩ → 400kHz; open → 440kHz; short → 1MHz - no floating allowed. |
| FB (7) | Feedback voltage sense | Monitors resistive divider output; 0.8V reference enables precise VOUT setting (e.g., 3.3V, 5V, 12V). |
| AGND (8) | Analog ground reference | Zero-volt reference for internal error amplifier and reference - must tie to PGND via small net-tie. |
| EN (9) | Precision enable/UVLO control | 1.1V–1.4V threshold; supports external resistor divider for system-level undervoltage lockout. |
| VIN (10,11,12) | Main input power supply | Three parallel pins reduce IR drop and improve high-current path robustness - connect directly to CIN. |
| PGND/DAP (13) | Power ground & thermal pad | Internally connects to low-side FET source and DAP; must be soldered to large PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous FETs | Eliminates external Schottky diode and reduces BOM count - 78mΩ HS / 45mΩ LS RDS(on) minimizes conduction loss. |
| Internal compensation | Enables stable loop response with only FB divider and input/output capacitors - no external Type-II/III network required. |
| Spread-spectrum modulation | Reduces peak EMI by ±10% frequency dithering - simplifies compliance with CISPR 25 Class 5 automotive emissions limits. |
| Hiccup-mode short-circuit protection | Shuts down for 96ms after overcurrent detection, then retries - prevents thermal runaway during sustained output faults. |
| Adjustable soft-start | 3.2–7.2ms internal ramp - controls inrush current and avoids input rail collapse during cold-start sequencing. |
Applications
| ADAS Camera Power Supply | Infotainment Head Unit Core Rail |
|---|---|
Use Scenario: Powers 5MP image sensor and ISP in forward-facing ADAS camera module operating in –40°C to +105°C under hood conditions. IC Role / Device Role / Timing Role: Primary 3.3V/6A buck regulator supplying sensor analog front-end and digital core; provides PGOOD signal for SoC reset coordination. Use Value: 25µA IQ enables always-on wake-on-motion functionality; 75ns tON-MIN supports 12V→3.3V conversion at 400kHz without foldback. |
Use Scenario: Generates 1.1V CPU core voltage for ARM-based infotainment processor in dashboard head unit with USB charging and display interfaces. IC Role / Device Role / Timing Role: High-efficiency synchronous buck stage following pre-regulator; synchronized via RT pin to avoid beat frequencies with display timing clocks. Use Value: ±1.0% VREF accuracy maintains SoC stability across temperature; spread spectrum lowers conducted EMI near sensitive audio ADC paths. |
| Automotive USB-C Charging Port | Cluster Instrument Display Backlight Driver |
Use Scenario: Supplies 5V/3A to USB-C PD controller and port power switches in center console charging module. IC Role / Device Role / Timing Role: Secondary buck converter fed from 12V main rail; uses EN pin for system-level enable/disable during vehicle sleep mode. Use Value: Precision enable input allows programmable UVLO (e.g., disable below 9V battery) - prevents brownout during engine cranking. |
Use Scenario: Provides 24V/1.5A backlight supply for TFT LCD cluster display with dynamic dimming control. IC Role / Device Role / Timing Role: Adjustable-output buck (via FB divider) delivering constant-current-equivalent voltage; PG signal monitors rail integrity during CAN-triggered display updates. Use Value: 36V max input withstands load-dump transients; hiccup-mode protection isolates fault without blowing fuse during LED string short. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR51460FSQDRRRQ1 | FPWM-only operation (no PFM mode); identical pinout, package, and protection features. | Better suited for noise-sensitive applications requiring constant switching frequency and minimal output ripple across full load range. | Select when low VOUT ripple and predictable EMI profile outweigh light-load efficiency requirements. |
| TPS546B24RVFT | Higher 12A rating, 3.5V–18V input, PMBus interface, and external compensation - larger 4mm × 4mm VQFN package. | Targets high-performance ADAS domain controllers needing telemetry, margining, and multi-rail sequencing. | Choose when digital monitoring, higher current, or programmable fault responses are required - not pin-compatible. |
Compared with LMR51460SQDRRRQ1, the FPWM variant offers tighter regulation at light loads but sacrifices 10–15% standby efficiency; the TPS546B24RVFT adds telemetry and scalability at the cost of layout complexity and footprint - neither is pin-compatible, but both serve adjacent automotive power nodes.
Availability
LMR51460SQDRRRQ1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment head units, and USB-C charging systems requiring stable component supply with AEC-Q100 qualification and long-term production support.
Supply support for LMR51460SQDRRRQ1 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 automotive-grade power management ICs, with decades of automotive qualification expertise and functional safety documentation support.
The LMR51460-Q1 product line delivers compact, high-efficiency DC/DC buck converters optimized for automotive body electronics, ADAS sensors, and infotainment systems - designed to meet stringent AEC-Q100 reliability and EMI requirements.
FAQ
What is the maximum input voltage rating for LMR51460SQDRRRQ1?
The LMR51460SQDRRRQ1 has an absolute maximum input voltage rating of 38V, with recommended operating range from 4V to 36V. It is specifically designed to withstand automotive load-dump transients up to 36V continuously and brief 38V spikes - verified per AEC-Q100 stress testing protocols.
Does LMR51460SQDRRRQ1 support both PFM and FPWM modes?
No - LMR51460SQDRRRQ1 is the PFM-only variant of the family. It automatically enters pulse-frequency modulation at light loads to maximize efficiency, while maintaining forced PWM only during heavy load. The FPWM version is LMR51460FSQDRRRQ1, which operates exclusively in constant-frequency mode.
How is the switching frequency set on LMR51460SQDRRRQ1?
The switching frequency of LMR51460SQDRRRQ1 is set using an external resistor from the RT pin to AGND. A 34.8kΩ resistor yields 400kHz; leaving RT open defaults to ~440kHz; shorting RT to ground sets 1MHz. The RT pin must never be left floating, as this causes undefined frequency behavior.
What thermal design considerations apply to LMR51460SQDRRRQ1 in WSON-12 package?
LMR51460SQDRRRQ1 in the WSON-12 (DRR) package has RθJA = 47.4°C/W. To sustain 6A continuous output at 125°C ambient, the PCB must include a 3mm × 3mm thermal pad connected via ≥8 thermal vias (0.3mm diameter) to inner ground planes, plus ≥4 cm² of 2-oz copper pour around the device.
Can LMR51460SQDRRRQ1 be used without an external bootstrap capacitor?
No - LMR51460SQDRRRQ1 requires a 100nF X7R/X5R ceramic capacitor between BOOT and SW pins to drive the high-side MOSFET gate. Omitting this capacitor causes immediate failure of high-side switching, resulting in no output regulation and potential damage due to shoot-through current.
LMR51460SQDRRRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- 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):
- 4V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 6A
- Frequency - Switching:
- 200kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WSON (3x3)
LMR51460SQDRRRQ1 FAQ
1.How can I place an order for LMR51460SQDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR51460SQDRRRQ1 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 LMR51460SQDRRRQ1 reliable?
The price and inventory of LMR51460SQDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR51460SQDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LMR51460SQDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR51460SQDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR51460SQDRRRQ1?
LMR51460SQDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR51460SQDRRRQ1 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 LMR51460SQDRRRQ1?
For technical support, including LMR51460SQDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR51460SQDRRRQ1 requirements.
6.How does Aetrix verify that LMR51460SQDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR51460SQDRRRQ1 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 LMR51460SQDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LMR51460SQDRRRQ1?
All LMR51460SQDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR51460SQDRRRQ1, 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 LMR51460SQDRRRQ1 part is unused and in its original packaging.
Return procedure for LMR51460SQDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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