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Texas Instruments LMR38020FSQDDARQ1
- Part No.:
- LMR38020FSQDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR38020FSQDDARQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,164
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Product details
Overview
LMR38020FSQDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 2A continuous output current across a 4.2V–80V input range, featuring 40µA quiescent current, FPWM mode for constant-frequency operation, and integrated spread-spectrum EMI reduction - deployed in 48V mild-hybrid ECU bias supplies.
For engineers reviewing the LMR38020FSQDDARQ1 datasheet, LMR38020FSQDDARQ1 pinout, LMR38020FSQDDARQ1 application, or LMR38020FSQDDARQ1 equivalent, key selection criteria include FPWM vs PFM mode trade-offs, RT/SYNC synchronization capability, thermal performance in HSOIC-8 PowerPAD™, and ±1.0% reference voltage accuracy over –40°C to +125°C.
Technical Context
The LMR38020FSQDDARQ1 implements fixed-frequency peak-current mode control with internal compensation, enabling stable regulation using minimal external 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 to maintain regulation at extreme duty cycles.
Its FPWM variant ensures constant switching frequency and low output ripple under light load, unlike PFM variants. The device integrates high-side (303mΩ) and low-side (133mΩ) MOSFETs, precision enable (1.10V–1.25V threshold), and a filtered open-drain power-good flag with 40µs glitch filter and 92%–112% VREF 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 without external suppressors. |
| Output Current | 2A continuous - sufficient for biasing microcontrollers, gate drivers, and sensors in automotive ECUs. |
| Quiescent Current | 40µA in non-switching state - enables always-on functionality in low-power wake-up circuits without draining battery. |
| Switching Frequency | 200kHz to 2.2MHz adjustable - allows optimization for efficiency (low fSW) or compact size (high fSW) and avoids noise-sensitive bands. |
| Reference Voltage Accuracy | ±1.0% at 25°C, ±1.5% over full temperature range - ensures tight output regulation for sensitive analog and digital loads. |
| Thermal Shutdown | 163°C shutdown / 150°C recovery - protects against sustained overload or poor heatsinking in enclosed automotive environments. |
| Package Thermal Resistance | RθJA = 42.9°C/W (HSOIC-8) - requires PCB copper pour under EP pad for reliable 2A operation at 125°C ambient. |
Pinout & Package
LMR38020FSQDDARQ1 uses an 8-pin HSOIC package with exposed thermal pad (DDA), measuring 4.89mm × 3.90mm. The PowerPAD™ enhances thermal dissipation and must be soldered to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and analog ground | Primary return path for VIN, SW, and FB; requires low-inductance connection to bypass capacitor and thermal pad. |
| EN (Pin 2) | Enable input | Logic-level control (1.10V–1.25V threshold); direct VIN tie enables self-start; floating prohibited. |
| VIN (Pin 3) | Main input supply | Accepts 4.2V–80V; requires local 10µF+ ceramic bypass capacitor placed adjacent to pin. |
| RT/SYNC (Pin 4) | Frequency programming/synchronization | Configures switching frequency via resistor to GND or accepts external clock (300kHz–2.1MHz) on falling edge. |
| FB (Pin 5) | Feedback input | Monitors output via resistor divider; 1.0V reference sets VOUT = 1.0V × (1 + RFBT/RFBB); leakage <2.1nA. |
| PG (Pin 6) | Open-drain power-good flag | Asserts high after soft-start (4ms delay) when VOUT is within 92%–112% of target; requires external pull-up. |
| BOOT (Pin 7) | Bootstrap supply | Drives high-side MOSFET gate; requires 100nF ceramic capacitor between BOOT and SW pins. |
| SW (Pin 8) | Switch node | Connects to power inductor; carries high di/dt; layout critical to minimize EMI and ringing. |
| EP (Thermal Pad) | Thermal and electrical ground | Must be soldered to large PCB ground plane for thermal conduction and low-impedance GND return. |
Key Features
| Feature | Design Value |
|---|---|
| FPWM Operation Mode | Enables constant switching frequency and low output voltage ripple at light load - essential for noise-sensitive ADAS and infotainment systems. |
| Spread Spectrum Modulation | Reduces peak EMI by ±8% frequency dithering - simplifies compliance with CISPR 25 Class 5 automotive EMC requirements. |
| Precision Enable Threshold | 1.10V–1.25V hysteresis enables robust system UVLO implementation using simple resistor dividers - eliminates need for external supervisors. |
| Integrated Synchronous Rectification | Eliminates external low-side diode; 303mΩ/133mΩ RDS(on) MOSFETs improve full-load efficiency and reduce BOM count and board area. |
| Prebiased Output Startup | Allows safe start-up into precharged output capacitors - prevents reverse current flow and protects downstream circuitry in hot-swap scenarios. |
| 97% Maximum Duty Cycle | Supports ultra-low dropout operation down to VIN ≈ VOUT (e.g., 5.2V input for 5V output), critical for 48V-to-12V/5V conversion in MHEV systems. |
Applications
| Automotive Inverter Bias Supply | 48V Mild-Hybrid ECU Power |
|---|---|
|
Use Scenario: Provides isolated 5V/3.3V bias to gate drivers and MCU in traction inverter control units operating from 48V bus. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering clean, regulated low-voltage rail with fast transient response to PWM-driven gate driver loads. Use Value: 40µA IQ extends sleep-mode battery life; FPWM mode prevents audible noise during low-load idle states; 80V rating handles inverter bus transients. |
Use Scenario: Powers communication interfaces, CAN transceivers, and sensor signal conditioning in 48V-based engine control modules. IC Role / Device Role / Timing Role: Main DC/DC converter stepping 48V down to 5V/3.3V with precise enable sequencing and power-good monitoring. Use Value: AEC-Q100 Grade 1 qualification ensures reliability at 125°C junction; spread spectrum reduces conducted EMI coupling into CAN/FlexRay buses. |
| Automotive Battery Management System | Automotive DC/DC Converter Auxiliary Rail |
|
Use Scenario: Supplies auxiliary 3.3V rail to BMS microcontroller, ADC reference, and cell monitoring ICs in high-voltage battery packs. IC Role / Device Role / Timing Role: High-input-voltage buck converter regulating from pack voltage (up to 75V) while maintaining tight output tolerance. Use Value: ±1.0% VREF accuracy ensures precise ADC measurements; thermal shutdown (163°C) safeguards against pack-level thermal runaway events. |
Use Scenario: Generates secondary 12V or 5V output in multi-rail automotive DC/DC converters where primary stage regulates 48V to 12V. IC Role / Device Role / Timing Role: Secondary-stage synchronous buck providing isolated, low-noise bias for analog front-ends and safety-critical logic. Use Value: 97% max duty cycle enables operation during cold-crank (VIN dip to 4.2V); RT/SYNC pin allows synchronization to master clock for EMI reduction. |
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 | Same 2A HSOIC-8 package and 4.2V–80V input, but operates in PFM mode only - no FPWM option. | Lacks constant-frequency operation; unsuitable where low-output-ripple or EMI predictability is required. | Select LMR38020SQDDARQ1 only if light-load efficiency is prioritized over ripple and noise control. |
| LM61480QRNXTQ1 | 3A rated, 3.5V–60V input, 2.1MHz max fSW, 15µA IQ, QFN-16 package - higher current, lower IQ, different footprint. | Requires PCB redesign; better suited for space-constrained, higher-current applications like ADAS domain controllers. | Choose LM61480QRNXTQ1 when >2A output or sub-20µA IQ is mandatory, accepting QFN thermal and layout complexity. |
Compared with LMR38020FSQDDARQ1, the PFM-only LMR38020SQDDARQ1 sacrifices ripple control for ultra-low IQ, while the LM61480QRNXTQ1 trades pin compatibility for higher current and lower quiescent draw - making LMR38020FSQDDARQ1 the optimal balance of FPWM stability, 2A capability, and HSOIC manufacturability in 48V automotive systems.
Availability
LMR38020FSQDDARQ1 is available at Aetrix Electronics and suitable for automotive inverter bias supplies, 48V mild-hybrid ECU power, and battery management system auxiliary rails requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LMR38020FSQDDARQ1 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 reliability and functional safety design.
The LMR38020FSQDDARQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, engineered specifically for rugged 48V and high-voltage battery systems in MHEV/EV applications where wide VIN, low IQ, and AEC-Q100 compliance are mandatory.
FAQ
What distinguishes LMR38020FSQDDARQ1 from the standard LMR38020-Q1?
The LMR38020FSQDDARQ1 is the FPWM-enabled variant of the LMR38020-Q1 family, meaning it maintains forced pulse-width modulation under all load conditions - unlike PFM versions that skip pulses at light load. This ensures constant switching frequency, minimal output voltage ripple, and predictable EMI behavior, which is critical for noise-sensitive automotive subsystems like radar and camera modules. The "F" in the part number explicitly denotes FPWM capability.
Does LMR38020FSQDDARQ1 support synchronization to an external clock?
Yes, LMR38020FSQDDARQ1 supports external clock synchronization via the RT/SYNC pin (Pin 4). When driven with a square wave between 300kHz and 2.1MHz, the internal PLL locks to the falling edge of the input clock. This enables EMI reduction through frequency alignment across multiple converters and eliminates beat frequencies in multi-rail systems - a key requirement in modern automotive domain controllers.
What is the minimum input voltage required for LMR38020FSQDDARQ1 to regulate?
The LMR38020FSQDDARQ1 requires a minimum input voltage of 4.2V to sustain regulation after startup. During startup, it can begin switching with as low as 3.8V on VIN, and its 97% maximum duty cycle allows operation even when VIN approaches VOUT - for example, regulating 5V output from a cold-cranked 48V bus dipping to 5.2V. This makes LMR38020FSQDDARQ1 especially suitable for automotive 48V systems experiencing wide dynamic voltage ranges.
How does the power-good (PG) flag behave during startup and fault conditions?
The LMR38020FSQDDARQ1 PG pin is an open-drain output that remains low for ~4ms after EN is asserted, then transitions high only when VOUT reaches 92% of target and remains stable. It pulls low again during overcurrent, thermal shutdown, or if VOUT falls below 92% of VREF. The internal 40µs glitch filter rejects short transients, and PG stays valid down to VIN = 2V even when EN is low - enabling robust system supervision in fail-safe architectures.
Can LMR38020FSQDDARQ1 be used with a prebiased output capacitor?
Yes, LMR38020FSQDDARQ1 supports start-up into a precharged output. Its control architecture prevents reverse current flow from VOUT to VIN during startup, protecting both the IC and downstream circuitry. This feature is essential in automotive systems where hot-swap or parallel power sources may leave output capacitors charged before the converter is enabled - eliminating the need for external reverse-current protection diodes or FETs.
LMR38020FSQDDARQ1 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:
- 2A
- 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
LMR38020FSQDDARQ1 FAQ
1.How can I place an order for LMR38020FSQDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR38020FSQDDARQ1 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 LMR38020FSQDDARQ1 reliable?
The price and inventory of LMR38020FSQDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR38020FSQDDARQ1 is usually 5 days.
3.What payment methods are accepted for LMR38020FSQDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR38020FSQDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR38020FSQDDARQ1?
LMR38020FSQDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR38020FSQDDARQ1 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 LMR38020FSQDDARQ1?
For technical support, including LMR38020FSQDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR38020FSQDDARQ1 requirements.
6.How does Aetrix verify that LMR38020FSQDDARQ1 is sourced from the original manufacturer or authorized distributors?
All LMR38020FSQDDARQ1 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 LMR38020FSQDDARQ1 meets industry standards.
7.What is the process for return or replacement of LMR38020FSQDDARQ1?
All LMR38020FSQDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR38020FSQDDARQ1, 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 LMR38020FSQDDARQ1 part is unused and in its original packaging.
Return procedure for LMR38020FSQDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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