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Texas Instruments LMR38010FSQDDARQ1
- Part No.:
- LMR38010FSQDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR38010FSQDDARQ1.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,255
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Product details
Overview
LMR38010FSQDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 1A continuous output current across a 4.2V to 80V input range, featuring 40µA quiescent current, FPWM mode for constant-frequency operation, and integrated spread spectrum for EMI reduction - deployed in 48V mild hybrid ECU bias supplies.
For engineers reviewing the LMR38010FSQDDARQ1 datasheet, LMR38010FSQDDARQ1 pinout, LMR38010FSQDDARQ1 application, or LMR38010FSQDDARQ1 equivalent, key selection considerations include FPWM vs PFM mode trade-offs, RT/SYNC synchronization capability, thermal performance in HSOIC-8 PowerPAD™, and precision enable functionality for system-level sequencing.
Technical Context
The LMR38010FSQDDARQ1 employs fixed-frequency peak-current mode control with internal compensation, enabling stable regulation across wide VIN and load ranges without external loop components. It supports both resistor-programmed (200kHz–2.2MHz) and externally synchronized (300kHz–2.1MHz) switching, with built-in dead-time control and frequency foldback during dropout.
Its FPWM variant maintains constant switching frequency down to zero load, eliminating PFM-induced output voltage ripple and enabling predictable EMI behavior. The device integrates high-side (303mΩ) and low-side (133mΩ) MOSFETs, precision 1.0V reference (±1.0% at 25°C), and open-drain power-good flag with 40µs glitch filtering and ±2% hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 80V - supports direct connection to 48V battery rails and withstands automotive load-dump transients up to 85V. |
| Output Current | 1A continuous - rated for sustained operation at full load with thermal derating per RθJA = 42.9°C/W (HSOIC-8). |
| Quiescent Current | 40µA - enables always-on systems (e.g., body control modules) to meet ultra-low standby power requirements. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor or external clock; avoids noise-sensitive bands in ADAS and infotainment systems. |
| Voltage Reference | 1.0V ±1.0% at 25°C - ensures ±1.5% output regulation over temperature and line/load in FPWM mode. |
| Protection Features | Cycle-by-cycle current limit, hiccup-mode short-circuit protection, thermal shutdown (163°C trip), and UVLO (4.2V start-up). |
| EMI Reduction | Pseudorandom spread spectrum (±4% span) - reduces peak radiated emissions without requiring additional filtering components. |
Pinout & Package
LMR38010FSQDDARQ1 is housed in an 8-pin HSOIC package with exposed thermal pad (DDA), measuring 4.89mm × 3.90mm, optimized for automotive PCB layouts with high thermal dissipation and >1.5mm creepage between VIN and GND pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and analog ground | Primary return path for power stage and feedback; must be connected directly to thermal pad and bypassed to VIN with low-inductance traces. |
| EN (Pin 2) | Enable control input | Logic-level interface (1.1–1.25V threshold) supporting direct VIN tie or precision UVLO divider; not floatable. |
| VIN (Pin 3) | Main input supply | Accepts 4.2–80V; requires local ceramic bypass capacitor; powers internal LDOs and gate drivers. |
| RT/SYNC (Pin 4) | Frequency programming/sync input | Configures switching frequency via resistor to GND or accepts external clock (300kHz–2.1MHz); auto-switches modes based on voltage level. |
| FB (Pin 5) | Feedback sensing node | Connects to resistor divider tap; monitors output voltage against 1.0V reference; leakage <2.1nA minimizes divider error. |
| PG (Pin 6) | Open-drain power-good flag | Signals valid regulation (high) after soft-start; includes 40µs glitch filter and hysteresis; pulls low during faults or EN deactivation. |
| BOOT (Pin 7) | Bootstrap supply | Drives high-side MOSFET gate; requires 100nF ceramic capacitor to SW; critical for reliable high-side conduction. |
| SW (Pin 8) | Switch node | Connects to power inductor; carries high di/dt; layout must minimize loop area to reduce EMI and voltage spikes. |
| EP (Thermal Pad) | Thermal and electrical ground | Must be soldered to large copper pour tied to system GND; primary heat path (RθJC(bot) = 4.3°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| FPWM Operation Mode | Enables constant-frequency, low-ripple regulation at light loads - critical for noise-sensitive ADCs and communication ICs in automotive ECUs. |
| Integrated Synchronous Rectification | Eliminates external Schottky diode; improves efficiency by ~5–8% at 1A vs asynchronous designs, reducing thermal stress in confined enclosures. |
| Precision Enable Input | Supports system-level sequencing and battery-discharge protection via external resistor divider; enables self-start from VIN or controlled activation by microcontroller. |
| Spread Spectrum Modulation | Reduces peak EMI by spreading energy across ±4% frequency band - simplifies compliance with CISPR 25 Class 5 without added shielding or filters. |
| Internal Soft-Start | 4ms ramp time prevents inrush current and output overshoot during startup - eliminates need for external soft-start circuitry or timing capacitors. |
| Power-Good Flag with Filtering | Provides validated system status signal with built-in 40µs glitch rejection - replaces external supervisor ICs in functional safety architectures (ISO 26262 ASIL-B capable). |
Applications
| Automotive Inverter Bias Supply | Automotive DC/DC Converter |
|---|---|
Use Scenario: Powers gate drivers and isolated sensors in 400V/800V traction inverter control units where input voltage varies widely during regenerative braking and load dump. IC Role / Device Role / Timing Role: Primary 5V/3.3V bias regulator supplying isolated gate driver ICs and MCU peripherals with tight transient response and fault signaling. Use Value: 97% max duty cycle enables regulation during 4.2V brownouts; PG flag triggers safe shutdown before inverter misfire. | Use Scenario: Replaces discrete buck solutions in front-end DC/DC conversion for ADAS domain controllers, converting 12V/48V battery to 5V/3.3V rails. IC Role / Device Role / Timing Role: Main step-down regulator with FPWM mode ensuring stable clock domains for radar SoCs and camera ISPs. Use Value: 40µA IQ extends battery runtime in parked ADAS monitoring; spread spectrum meets CISPR 25 radiated emission limits. |
| Automotive Battery Management System | Automotive 48V Mild Hybrid ECU Bias Supply |
Use Scenario: Supplies auxiliary power to BMS cell monitoring ICs and isolation interfaces in high-voltage battery packs operating from 20V–60V pack voltages. IC Role / Device Role / Timing Role: Isolated secondary-side bias supply supporting daisy-chain communication and voltage sensing circuits. Use Value: AEC-Q100 Grade 1 qualification ensures reliability at 125°C ambient; 80V abs max rating accommodates pack transients. | Use Scenario: Generates 3.3V/5V bias for 48V-to-12V bi-directional converter control logic and CAN transceivers in mild hybrid powertrain ECUs. IC Role / Device Role / Timing Role: Primary regulated supply for MCU, gate drivers, and communication interfaces in compact, thermally constrained modules. Use Value: HSOIC-8 PowerPAD™ package delivers 29°C/W effective θJA on EVM; FPWM mode suppresses audible noise during idle operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR38010SQDDARQ1 | Same 1A, 4.2–80V specs but uses PFM mode only - no FPWM option; higher light-load ripple; no external sync capability. | Suitable for non-noise-critical, always-on systems where efficiency > regulation stability is prioritized. | Select when lowest IQ (40µA) and simplicity outweigh need for constant frequency or EMI control. |
| LMR36510RQDRRQ1 | Lower 65V max input, 1A output, 2.1MHz max fSW, 26µA IQ; uses different 8-pin VSON package with wettable flanks. | Better suited for space-constrained ADAS cameras or infotainment modules needing smaller footprint and lower profile. | Choose for new designs targeting miniaturization and automated optical inspection (AOI) compatibility, accepting reduced input voltage headroom. |
Compared with LMR38010SQDDARQ1, the LMR38010FSQDDARQ1 adds FPWM and spread spectrum for noise-sensitive applications; versus LMR36510RQDRRQ1, it trades smaller size and lower IQ for higher input voltage tolerance and HSOIC thermal robustness in under-hood environments.
Availability
LMR38010FSQDDARQ1 is available at Aetrix Electronics and suitable for automotive inverter bias supplies, 48V mild hybrid ECUs, and battery management systems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LMR38010FSQDDARQ1 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 power management technologies, with deep expertise in automotive-grade IC design and functional safety certification.
The LMR38010FSQDDARQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, engineered specifically for rugged 48V/12V dual-battery systems in MHEV/EV powertrains and ADAS subsystems.
FAQ
What is the maximum input voltage rating for the LMR38010FSQDDARQ1?
The LMR38010FSQDDARQ1 has an absolute maximum input voltage of 85V and a recommended operating input range of 4.2V to 80V. This allows it to handle automotive load-dump transients while maintaining regulation during 48V battery brownouts down to 4.2V - a key requirement for ISO 16750-2 compliance in under-hood applications.
Does the LMR38010FSQDDARQ1 support external clock synchronization?
Yes, the LMR38010FSQDDARQ1 supports external clock synchronization via its RT/SYNC pin, accepting square-wave inputs from 300kHz to 2.1MHz. When the pin voltage exceeds the PLL upper threshold, the internal oscillator disables and the pin becomes a high-impedance sync input - enabling deterministic timing alignment with system clocks in multi-rail power architectures.
How does the FPWM mode in the LMR38010FSQDDARQ1 differ from PFM mode?
The LMR38010FSQDDARQ1's FPWM mode maintains constant switching frequency across all load conditions, minimizing output voltage ripple and enabling predictable EMI filtering - unlike PFM mode which skips pulses at light loads. FPWM is essential for powering noise-sensitive analog and RF circuits in automotive ECUs where spectral content must remain bounded.
What thermal performance can be expected from the LMR38010FSQDDARQ1 in its HSOIC-8 PowerPAD™ package?
In the HSOIC-8 PowerPAD™ (DDA) package, the LMR38010FSQDDARQ1 achieves RθJA = 42.9°C/W on standard JEDEC boards and RθJA(effective) = 29°C/W on TI's evaluation module. With RθJC(bot) = 4.3°C/W, the thermal pad must be soldered to ≥250mm² of inner-layer copper ground plane to sustain 1A continuous output at 125°C ambient.
Is the LMR38010FSQDDARQ1 qualified for functional safety applications?
Yes, the LMR38010FSQDDARQ1 is functional safety-capable with documentation available to support ISO 26262 ASIL-B system development. Its features - including precision enable, power-good flag with glitch filtering, thermal shutdown (163°C), and cycle-by-cycle current limiting - provide the diagnostic coverage and failure mode predictability required for automotive safety-related power supplies.
LMR38010FSQDDARQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- 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):
- 4.2V
- Voltage - Input (Max):
- 80V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 75V
- Current - Output:
- 1A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR38010FSQDDARQ1 FAQ
1.How can I place an order for LMR38010FSQDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR38010FSQDDARQ1 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 LMR38010FSQDDARQ1 reliable?
The price and inventory of LMR38010FSQDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR38010FSQDDARQ1 is usually 5 days.
3.What payment methods are accepted for LMR38010FSQDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR38010FSQDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR38010FSQDDARQ1?
LMR38010FSQDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR38010FSQDDARQ1 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 LMR38010FSQDDARQ1?
For technical support, including LMR38010FSQDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR38010FSQDDARQ1 requirements.
6.How does Aetrix verify that LMR38010FSQDDARQ1 is sourced from the original manufacturer or authorized distributors?
All LMR38010FSQDDARQ1 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 LMR38010FSQDDARQ1 meets industry standards.
7.What is the process for return or replacement of LMR38010FSQDDARQ1?
All LMR38010FSQDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR38010FSQDDARQ1, 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 LMR38010FSQDDARQ1 part is unused and in its original packaging.
Return procedure for LMR38010FSQDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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