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Texas Instruments LMR38010SQDDARQ1
- Part No.:
- LMR38010SQDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR38010SQDDARQ1.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,119
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Product details
Overview
LMR38010SQDDARQ1 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, adjustable 200kHz–2.2MHz switching frequency, and integrated power-good flag - deployed in 48V mild hybrid ECU bias supplies and motor control inverters.
For engineers reviewing the LMR38010SQDDARQ1 datasheet, LMR38010SQDDARQ1 pinout, LMR38010SQDDARQ1 application, or LMR38010SQDDARQ1 equivalent, key selection considerations include VIN dropout capability down to 4.2V, ±1.0% reference voltage accuracy at 25°C, PFM/FPWM mode flexibility, spread-spectrum EMI reduction, and thermal shutdown at 163°C with recovery at 150°C.
Technical Context
The LMR38010SQDDARQ1 implements fixed-frequency peak-current mode control with internal compensation, enabling stable regulation using minimal external components. It integrates high-side (303mΩ) and low-side (133mΩ) MOSFETs, supports prebiased start-up, and features precision enable with 1.1V–1.4V logic thresholds for robust system sequencing.
Its RT/SYNC pin enables either resistor-programmed frequency (200kHz–2.2MHz) or synchronization to an external 300kHz–2.1MHz clock, while pseudorandom spread spectrum reduces EMI without requiring external filters. The device operates in PFM for ultra-low-noise light-load efficiency or FPWM for constant-frequency, low-ripple performance - both modes supported by the same silicon variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 80V - supports direct connection to 48V battery rails and withstands load-dump transients up to 85V. |
| Output Current | 1A continuous - rated for sustained operation at full load with thermal derating above 125°C junction temperature. |
| Quiescent Current | 40µA - enables always-on functionality in automotive infotainment and telematics without excessive battery drain. |
| Reference Voltage | 1.0V ±1.0% at 25°C - ensures ≤±2.5% output voltage regulation over full temperature and load range for 5V/12V bias rails. |
| Switching Frequency | 200kHz–2.2MHz adjustable - allows layout optimization: lower frequencies improve efficiency; higher frequencies reduce inductor/capacitor size. |
| Power-Good Flag | Open-drain PG with 40µs glitch filter and 90–114% VREF hysteresis - provides reliable system reset signaling without external supervisor ICs. |
| Thermal Shutdown | 163°C shutdown / 150°C recovery - protects against sustained overload or poor heatsinking in enclosed ECU enclosures. |
Pinout & Package
LMR38010SQDDARQ1 is housed in an 8-pin HSOIC package (DDA) with PowerPAD™ thermal pad (4.89mm × 3.90mm), optimized for automotive PCB layouts with >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 all currents; must be connected to low-impedance system ground plane via thermal pad and short wide traces. |
| EN (Pin 2) | Enable control input | Logic-level interface (1.1V–1.4V threshold) enabling direct VIN tie or precision UVLO via resistor divider for system sequencing. |
| VIN (Pin 3) | Main input supply | Accepts 4.2V–80V; requires local 10µF+ ceramic bypass capacitor placed adjacent to pin with minimal trace inductance. |
| RT/SYNC (Pin 4) | Frequency programming/sync input | Configures switching frequency via resistor to GND or accepts external 300kHz–2.1MHz clock signal with built-in PLL lock detection. |
| FB (Pin 5) | Feedback voltage sense | Monitors output via resistive divider; 1.0V reference enables precise adjustable outputs from 1V to 75V with <±2.5% total error. |
| PG (Pin 6) | Power-good open-drain flag | Signals valid regulation status; requires external pull-up; asserts low during startup, fault, or undervoltage conditions. |
| BOOT (Pin 7) | High-side gate driver supply | Requires 100nF ceramic capacitor to SW node to sustain gate drive for integrated high-side MOSFET. |
| SW (Pin 8) | Switch node | Connects to power inductor; carries high di/dt; must be routed with minimum loop area to reduce EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive reliability requirements for engine bay and under-hood ECUs. |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction losses and improves full-load efficiency by ≥5% vs asynchronous designs. |
| Spread-spectrum modulation | Reduces peak EMI amplitude by ±4% frequency dithering - simplifies compliance with CISPR 25 Class 5 radiated emissions limits. |
| Prebiased output start-up | Enables safe turn-on when output capacitor is precharged - critical for hot-swap and redundant power architectures. |
| 97% maximum duty cycle | Supports operation down to 4.2V input at near-unity duty cycle - maintains regulation during cold-crank and battery sag events. |
Applications
| Automotive Inverter Bias Supply | 48V Mild Hybrid ECU |
|---|---|
Use Scenario: Provides isolated 5V/3.3V bias for gate drivers and MCU in traction inverter modules operating from 48V battery. IC Role / Device Role / Timing Role: Primary DC/DC regulator supplying clean, regulated power to IGBT/SiC gate drivers and microcontroller subsystems. Use Value: Withstands 80V transients and sustains regulation at 4.2V input - ensures uninterrupted operation during load dump and cold-crank conditions. | Use Scenario: Powers control logic and sensors in 48V starter-generator ECUs where low quiescent current extends battery life during vehicle idle. IC Role / Device Role / Timing Role: Always-on buck converter delivering 1A at 3.3V/5V with 40µA IQ to minimize standby power draw. Use Value: Ultra-low IQ enables >10-year battery hold-up time in telematics and ADAS domain controllers without compromising start-up reliability. |
| Automotive Battery Management System | Automotive DC/DC Converter Auxiliary Rail |
Use Scenario: Generates auxiliary 12V rail for BMS cell monitoring ICs and isolation interfaces in high-voltage EV battery packs. IC Role / Device Role / Timing Role: Input-stage buck converter stepping down 48V–80V pack voltage to stable 12V for analog front-end and communication circuits. Use Value: Wide VIN range eliminates need for pre-regulator stages; integrated PG flag enables real-time health monitoring of auxiliary power integrity. | Use Scenario: Supplies 5V/12V bias to CAN transceivers, LIN controllers, and sensor interfaces in multi-rail automotive DC/DC converters. IC Role / Device Role / Timing Role: Secondary regulation stage providing noise-immune, low-ripple power to communication and sensing subsystems. Use Value: FPWM mode ensures constant switching frequency and <1% output ripple - prevents interference with sensitive analog and digital bus signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR38020SQDDARQ1 | 2A output current rating; identical pinout, package, and feature set except higher current capability. | Suitable for higher-power ECUs requiring >1A bias rails; same thermal design but higher current headroom. | Select when future-proofing for increased load or parallel operation; shares same PCB footprint and layout. |
| TPS543B20RVFT | 3.5V–20V input range; 15A output; PMBus interface; no spread spectrum; different package (20-pin QFN). | Targeted at high-current, digitally controlled point-of-load applications - not drop-in compatible. | Choose only for systems requiring telemetry, dynamic voltage scaling, or >2A loads; requires new layout and firmware integration. |
Compared with LMR38020SQDDARQ1, the LMR38010SQDDARQ1 offers optimal cost and thermal performance for 1A applications without overdesign; versus TPS543B20RVFT, it delivers superior input voltage range and automotive qualification at lower complexity and BOM count.
Availability
LMR38010SQDDARQ1 is available at Aetrix Electronics and suitable for automotive inverter bias supplies, 48V mild hybrid ECU power rails, and battery management system auxiliary converters requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LMR38010SQDDARQ1 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 solutions with decades of automotive qualification expertise.
The LMR38010SQDDARQ1 belongs to TI's SIMPLE SWITCHER® automotive buck converter family, engineered specifically for rugged 48V/60V/80V battery systems in MHEV/EV powertrain and chassis control units.
FAQ
What is the absolute maximum input voltage rating for the LMR38010SQDDARQ1?
The LMR38010SQDDARQ1 has an absolute maximum input voltage rating of 85V between VIN and PGND. This exceeds its recommended operating range of 4.2V to 80V and accommodates transient surges such as ISO 7637-2 pulse 5a (load dump). Operation beyond 85V risks permanent damage per the datasheet's Absolute Maximum Ratings table.
Does the LMR38010SQDDARQ1 support synchronization to an external clock source?
Yes, the LMR38010SQDDARQ1 supports external clock synchronization via its RT/SYNC pin. When driven with a square wave between 300kHz and 2.1MHz, the internal PLL locks to the falling edge of the input clock. The device automatically reverts to resistor-programmed mode if the external clock stops, ensuring fail-safe operation in automotive systems.
How does the LMR38010SQDDARQ1 handle start-up with a precharged output capacitor?
The LMR38010SQDDARQ1 supports prebiased output start-up, allowing safe turn-on when the output capacitor is already charged. During this condition, the controller disables the low-side switch initially and ramps the high-side duty cycle gradually to avoid reverse current flow and potential damage to downstream circuitry - a critical feature for redundant power systems.
What is the purpose of the >1.5mm distance between VIN and GND pins on the LMR38010SQDDARQ1 package?
The >1.5mm creepage distance between VIN and GND pins on the LMR38010SQDDARQ1's HSOIC package satisfies reinforced insulation requirements for automotive safety-critical applications per ISO 26262. This spacing prevents arcing and ensures long-term reliability under high humidity, contamination, and voltage transients typical in under-hood environments.
Can the LMR38010SQDDARQ1 operate in forced PWM (FPWM) mode, and how is it enabled?
The LMR38010SQDDARQ1 is the PFM-only variant; FPWM capability is exclusive to the LMR38010FSQDDARQ1. The LMR38010SQDDARQ1 automatically enters PFM at light loads to maximize efficiency, with no user-selectable FPWM mode. For constant-frequency operation, the FPWM variant must be selected - they share identical pinout and package but differ in internal configuration.
LMR38010SQDDARQ1 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
LMR38010SQDDARQ1 FAQ
1.How can I place an order for LMR38010SQDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR38010SQDDARQ1 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 LMR38010SQDDARQ1 reliable?
The price and inventory of LMR38010SQDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR38010SQDDARQ1 is usually 5 days.
3.What payment methods are accepted for LMR38010SQDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR38010SQDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR38010SQDDARQ1?
LMR38010SQDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR38010SQDDARQ1 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 LMR38010SQDDARQ1?
For technical support, including LMR38010SQDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR38010SQDDARQ1 requirements.
6.How does Aetrix verify that LMR38010SQDDARQ1 is sourced from the original manufacturer or authorized distributors?
All LMR38010SQDDARQ1 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 LMR38010SQDDARQ1 meets industry standards.
7.What is the process for return or replacement of LMR38010SQDDARQ1?
All LMR38010SQDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR38010SQDDARQ1, 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 LMR38010SQDDARQ1 part is unused and in its original packaging.
Return procedure for LMR38010SQDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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