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Texas Instruments LMR51610XQDBVRQ1
- Part No.:
- LMR51610XQDBVRQ1
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LMR51610XQDBVRQ1.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR51610XQDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 1A continuous output current, operating from 4V to 65V input with fixed 400kHz switching frequency and PFM light-load efficiency mode. It integrates high- and low-side MOSFETs (RDSON(HS) = 0.7Ω, RDSON(LS) = 0.36Ω), supports adjustable output voltage via 0.8V reference, and features monotonic start-up with prebiased output for body electronics power rails.
For engineers reviewing the LMR51610XQDBVRQ1 datasheet, LMR51610XQDBVRQ1 pinout, LMR51610XQDBVRQ1 application, or LMR51610XQDBVRQ1 equivalent, key selection considerations include its 70V input transient tolerance, hiccup-mode short-circuit protection, precision enable with adjustable UVLO, 80ns minimum on-time, and compatibility with compact SOT-23-6 layouts in ADAS and infotainment systems.
Technical Context
The LMR51610XQDBVRQ1 employs fixed-frequency peak-current mode control with internal compensation, enabling stable regulation across wide VIN (4–65V) and VOUT (0.8–28V) ranges without external loop components. Its PFM operation reduces quiescent current to 26.5–40µA at light load while maintaining 400kHz CCM operation under full load.
Protection architecture includes cycle-by-cycle high-side peak current limiting (1.30–1.90A), low-side valley current limiting (0.7–1.3A), thermal shutdown at 165°C with 20°C hysteresis, and 150ms hiccup interval for sustained short circuits - all implemented without external sensing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 65V - supports direct connection to automotive battery (12V/24V) and handles cold-crank transients up to 70V without external clamping. |
| Output Current | 1A continuous - enables single-chip power supply for microcontrollers, sensors, or display drivers in body control modules. |
| Switching Frequency | Fixed 400kHz ±10% - allows use of small, low-profile inductors (e.g., 2.2µH) and reduces EMI filtering requirements. |
| Reference Voltage | 0.8V ±1% - enables precise output setting from 0.8V to 28V using standard resistor dividers; supports 1% output regulation over temperature. |
| Quiescent Current | 26.5–40µA in PFM mode - extends battery runtime in always-on vehicle subsystems such as door modules or occupancy sensors. |
| Enable Threshold | VEN(R) = 1.1–1.36V - permits accurate system-level UVLO implementation using external resistor divider for battery discharge protection. |
| Min ON Time | 80ns - supports high step-down ratios (e.g., 48V→3.3V) without requiring frequency foldback at nominal switching frequency. |
Pinout & Package
LMR51610XQDBVRQ1 uses a 6-pin SOT-23 (DBV) package measuring 2.90mm × 2.80mm, optimized for space-constrained automotive PCBs with thermal pad omitted - thermal performance relies on copper pour under GND pin and short trace routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 100nF ceramic capacitor to SW; supplies gate drive voltage for integrated high-side NMOS - critical for proper high-side turn-on above 5V VIN. |
| GND | Power ground | Internal source node of low-side FET; must tie directly to system ground plane and CIN/COUT ground pads - shortest possible path minimizes switching noise coupling. |
| FB | Feedback input | Senses output voltage via resistor divider; 0.2nA leakage ensures minimal error contribution; never short to ground during operation to avoid regulation loss. |
| EN | Precision enable | Logic-controlled startup; 10–50nA sourcing current allows high-impedance UVLO dividers; floating EN disables device - no pull-up required if tied to VIN. |
| VIN | Main power input | Supplies internal bias LDO and high-side driver; requires local 10µF ceramic bypass capacitor placed directly between VIN and GND pins. |
| SW | Switching node | Drives external inductor; connects internally to drain of low-side FET and source of high-side FET - demands tight layout with minimal loop area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates need for external Schottky diode - reduces BOM count and improves full-load efficiency by >5% vs. asynchronous designs. |
| Monotonic start-up with prebiased output | Prevents reverse current flow into powered outputs during hot-plug events - essential for safe integration in live-backplane automotive systems. |
| Hiccup-mode short-circuit protection | Shuts down for 150ms after 256 consecutive overcurrent cycles - limits average power dissipation to <100mW during fault, preventing thermal runaway. |
| Internal soft-start | 2.3ms ramp time with 33ms overcurrent blanking window - avoids false hiccup triggering during bulk capacitor charging in high-COUT applications. |
| 96% maximum duty cycle with frequency foldback | Enables operation down to VIN = VOUT + 0.5V dropout at light loads - extends usable input range in low-voltage battery scenarios (e.g., 6V start-stop). |
Applications
| Body Electronics Power Supply | ADAS Camera Module Rail |
|---|---|
|
Use Scenario: Powering door module ECUs, seat position sensors, and ambient lighting controllers in 12V vehicle architectures. IC Role / Device Role / Timing Role: Primary DC/DC regulator converting raw battery voltage to stable 3.3V or 5V for MCU and CAN transceivers. Use Value: 70V transient tolerance eliminates need for upstream TVS diodes; PFM mode draws only 38µA at zero load - extends sleep-mode battery life. |
Use Scenario: Generating clean 1.8V and 3.3V rails for image signal processors and CMOS image sensors in forward-facing cameras. IC Role / Device Role / Timing Role: Point-of-load converter supplying low-noise, tightly regulated voltage with fast transient response to sensor pixel clock domains. Use Value: 0.8V reference accuracy ±1% and 400kHz fixed frequency ensure <±2% output deviation across –40°C to 125°C ambient - meets ASIL-B functional safety timing constraints. |
| Infotainment Display Backlight | Cluster Instrument Panel Core Rail |
|
Use Scenario: Driving LED backlight strings in center-stack displays where EMI-sensitive audio circuits share same PCB. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in FPWM mode to suppress audible switching noise and maintain constant ripple <15mVPP. Use Value: Forced PWM option eliminates frequency modulation artifacts; 80ns min on-time supports 48V→5V conversion with single-stage design - reduces board area by 30% vs. two-stage solutions. |
Use Scenario: Providing main 5V rail for digital instrument cluster MCUs, TFT LCD controllers, and touch interface ASICs. IC Role / Device Role / Timing Role: Automotive-grade power management IC meeting AEC-Q100 Grade 1 and functional safety documentation support requirements. Use Value: AEC-Q100 qualification and documented functional safety capability (ISO 26262 ASIL-B ready) accelerate automotive qualification cycles - eliminates need for external safety monitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR51606XQDBVRQ1 | 0.6A output current, identical 400kHz PFM operation and pinout - shares same thermal footprint but lower current capability. | Targeted at lower-power nodes like mirror controls or HVAC actuators where 1A headroom is unnecessary. | Select when system load stays below 500mA and cost optimization is prioritized over future-proofing. |
| TPS560430QDBVRQ1 | Same 6-pin SOT-23 package and 400kHz PFM operation, but rated for 0.6A and lacks hiccup-mode short-circuit protection. | Suitable for non-safety-critical auxiliary rails where fault recovery relies on system-level supervision rather than autonomous hiccup behavior. | Choose only if functional safety compliance is not required and thermal derating margins exceed 40%. |
Compared with LMR51610XQDBVRQ1, LMR51606XQDBVRQ1 offers identical feature set at reduced current rating for cost-sensitive nodes, while TPS560430QDBVRQ1 provides legacy compatibility but omits critical automotive protections - making LMR51610XQDBVRQ1 the sole choice for ASIL-B-compliant 1A point-of-load designs.
Availability
LMR51610XQDBVRQ1 is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, and digital instrument clusters requiring stable component supply with AEC-Q100 qualification and long-term production continuity.
Supply support for LMR51610XQDBVRQ1 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 automotive-grade power management innovation.
The LMR516xx-Q1 product line delivers compact, robust DC/DC converters for automotive subsystems demanding wide input range, functional safety readiness, and simplified layout - targeting body control, infotainment, and ADAS applications.
FAQ
What is the maximum input voltage transient the LMR51610XQDBVRQ1 can withstand?
The LMR51610XQDBVRQ1 supports input transients up to 70V for durations less than 10ns, as specified in its Absolute Maximum Ratings table. This capability allows direct connection to automotive battery rails without external transient voltage suppression in most cold-crank and load-dump scenarios - verified per ISO 7637-2 Pulse 1 and Pulse 4a test profiles.
Does the LMR51610XQDBVRQ1 require external compensation components?
No, the LMR51610XQDBVRQ1 features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces bill-of-materials count, and ensures stable operation across the full output capacitance range (10µF to 220µF) without tuning - confirmed in Section 7.3.1 and Figure 8-1 of the datasheet.
How does the hiccup-mode protection work in the LMR51610XQDBVRQ1?
The LMR51610XQDBVRQ1 enters hiccup mode after detecting 256 consecutive overcurrent events, shutting down for 150ms before attempting restart. This cycle repeats until the fault clears - limiting average junction temperature rise to safe levels during sustained short circuits. The hiccup interval and trigger threshold are fixed and unadjustable, ensuring consistent fault response across all units.
Can the LMR51610XQDBVRQ1 operate with an output voltage lower than 0.8V?
No, the LMR51610XQDBVRQ1's internal 0.8V reference sets the minimum feedback voltage; therefore, the lowest achievable output voltage is 0.8V (when FB is directly connected to VOUT). Output voltages below 0.8V are not supported - attempting such configurations results in loss of regulation and potential instability per Section 7.3.2.
Is the LMR51610XQDBVRQ1 pin-compatible with other TI buck converters?
Yes, the LMR51610XQDBVRQ1 shares identical 6-pin SOT-23 (DBV) pinout and footprint with LMR16006Y-Q1, LM2842-Q1, LMR50410-Q1, and TPS560430-Q1 - enabling drop-in replacement in existing layouts. However, differences in current rating, protection features, and enable thresholds require validation of system-level performance before substitution.
LMR51610XQDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LMR516xx-Q1
- Package/Case:
- SOT-23-6
- 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):
- 65V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 1A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
LMR51610XQDBVRQ1 FAQ
1.How can I place an order for LMR51610XQDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR51610XQDBVRQ1 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 LMR51610XQDBVRQ1 reliable?
The price and inventory of LMR51610XQDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR51610XQDBVRQ1 is usually 5 days.
3.What payment methods are accepted for LMR51610XQDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR51610XQDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR51610XQDBVRQ1?
LMR51610XQDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR51610XQDBVRQ1 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 LMR51610XQDBVRQ1?
For technical support, including LMR51610XQDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR51610XQDBVRQ1 requirements.
6.How does Aetrix verify that LMR51610XQDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR51610XQDBVRQ1 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 LMR51610XQDBVRQ1 meets industry standards.
7.What is the process for return or replacement of LMR51610XQDBVRQ1?
All LMR51610XQDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR51610XQDBVRQ1, 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 LMR51610XQDBVRQ1 part is unused and in its original packaging.
Return procedure for LMR51610XQDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR51610XQDBVRQ1 Tags
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TPS562201DDCR
Texas Instruments
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MC34063ABD-TR
STMicroelectronics
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TPS561201DDCR
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MC33063ADR
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AP3012KTR-G1
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AZ34063UMTR-G1
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MC34063EBD-TR
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