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Texas Instruments LMR38020SQDDARQ1
- Part No.:
- LMR38020SQDDARQ1
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMR38020SQDDARQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,203
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Product details
Overview
LMR38020SQDDARQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 2A continuous output current across a 4.2V to 80V input range, featuring 40µA quiescent current, adjustable 200kHz–2.2MHz switching frequency, and integrated synchronous rectification for 48V mild-hybrid ECU bias supplies.
For engineers reviewing the LMR38020SQDDARQ1 datasheet, LMR38020SQDDARQ1 pinout, LMR38020SQDDARQ1 application, or LMR38020SQDDARQ1 equivalent, key selection criteria include VIN dropout capability down to 4.2V, ±1.0% reference voltage accuracy at 25°C, precision enable with 1.1V–1.25V logic thresholds, spread-spectrum EMI reduction, and thermal shutdown at 163°C.
Technical Context
The LMR38020SQDDARQ1 employs fixed-frequency peak-current mode control with internal compensation, supporting both PFM (for light-load efficiency) and FPWM (for constant frequency and low ripple) operation modes. It integrates high-side (303mΩ) and low-side (133mΩ) MOSFETs with 80ns minimum on-time and 190ns minimum off-time.
Its functional safety-capable architecture includes cycle-by-cycle current limiting, hiccup-mode short-circuit protection, power-good flag with 40µs glitch filtering, and UVLO with hysteresis. The device supports external synchronization (300kHz–2.1MHz) and spread-spectrum modulation to meet automotive EMI requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 80V - enables direct connection to 12V/24V/48V automotive batteries without pre-regulation |
| Output Current | 2A continuous - supports high-current bias rails for motor control gate drivers and BMS analog circuitry |
| Quiescent Current | 40µA - sustains ultra-low standby power in always-on vehicle modules |
| Switching Frequency | 200kHz to 2.2MHz - avoids AM band interference and allows optimization for size (high fSW) or efficiency (low fSW) |
| Reference Voltage Accuracy | ±1.0% at 25°C - ensures tight output regulation across temperature for sensitive ADC references |
| Duty Cycle Max | 97% - maintains regulation during cold-crank events where VIN dips to 4.2V |
| Thermal Shutdown | 163°C shutdown / 150°C recovery - protects against sustained overload in enclosed ECUs |
Pinout & Package
LMR38020SQDDARQ1 is housed in an 8-pin HSOIC package (4.89mm × 3.90mm) with PowerPAD™ thermal pad connected to PGND for enhanced heat dissipation in automotive under-hood environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and analog ground | Primary return path for all currents; must be connected directly to bypass capacitor and VIN with short wide traces |
| EN (Pin 2) | Enable input | Logic-controlled startup/shutdown; 1.1V–1.25V threshold enables direct VIN tie or precision UVLO divider |
| VIN (Pin 3) | Main input supply | Accepts 4.2V–80V; requires local ceramic bypass to GND for transient suppression |
| RT/SYNC (Pin 4) | Frequency programming or sync input | Configurable via resistor (200kHz–2.2MHz) or external clock (300kHz–2.1MHz); auto-switches between modes |
| FB (Pin 5) | Feedback input | Monitors output via resistor divider; 1.0V reference enables precise VOUT setting from 1V to 75V |
| PG (Pin 6) | Open-drain power-good flag | Indicates regulated output with 112%/92% hysteresis; includes 40µs glitch filter and EN-synchronized assertion |
| BOOT (Pin 7) | Bootstrap supply | Drives high-side MOSFET gate; requires 100nF capacitor to SW for charge replenishment |
| SW (Pin 8) | Switch node | Connects to power inductor; carries high dv/dt; layout critical for EMI control |
| EP (Thermal Pad) | Thermal ground | Must be soldered to PCB ground plane to achieve RθJA = 29°C/W on EVM |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Rectification | Eliminates external Schottky diode, reducing conduction losses and board area in 2A DC/DC designs |
| Precision Enable Input | Supports system-level sequencing and battery discharge protection via programmable UVLO using external resistors |
| Spread-Spectrum Modulation | Reduces peak EMI by ±8% frequency dithering-critical for CISPR 25 Class 5 compliance in automotive modules |
| Prebiased Output Startup | Allows safe start-up into existing output voltage without reverse current flow-essential for hot-swap applications |
| Internal Soft-Start | 4ms controlled ramp prevents inrush current and output overshoot during power-up sequences |
Applications
| Automotive Inverter Bias Supply | Automotive Battery Management System |
|---|---|
Use Scenario: Powers gate drivers and isolated ADCs in 400V–800V traction inverter control units. IC Role / Device Role / Timing Role: Primary 12V bias regulator converting 48V auxiliary bus to stable 12V/5V rails. Use Value: 97% max duty cycle maintains regulation during 48V cold-crank dips to 4.2V; 40µA IQ extends sleep-mode battery life. | Use Scenario: Supplies analog front-end, cell monitoring ICs, and CAN transceivers in high-voltage battery packs. IC Role / Device Role / Timing Role: High-reliability step-down converter for safety-critical BMS domain controllers. Use Value: AEC-Q100 Grade 1 qualification (–40°C to +125°C TA) and thermal shutdown ensure operation in under-battery environments. |
| Automotive 48V Mild Hybrid ECU | Automotive DC/DC Converter Module |
Use Scenario: Generates 3.3V/5V logic rails for engine control units interfacing with 48V starter-generator systems. IC Role / Device Role / Timing Role: Main DC/DC stage in compact 48V-to-low-voltage conversion subsystem. Use Value: Adjustable 200kHz–2.2MHz switching avoids noise-sensitive bands; spread spectrum meets OEM EMI limits. | Use Scenario: Serves as secondary regulator in multi-rail automotive infotainment head units requiring clean 1.8V/3.3V outputs. IC Role / Device Role / Timing Role: Synchronous buck converter providing tightly regulated intermediate voltage rails. Use Value: ±1.0% reference accuracy and power-good flag enable robust system reset coordination and fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR38020FSQDDARQ1 | Includes forced PWM (FPWM) mode; higher light-load ripple but constant frequency and tighter regulation | Better suited for noise-sensitive analog circuits requiring fixed-frequency operation | Select when low output voltage ripple and predictable EMI profile outweigh efficiency concerns at light load |
| LM61480QRNXTQ1 | 3.5A rating, 3.5V–36V input, 20µA IQ, 2.1MHz max fSW, smaller 3mm × 2mm QFN | Optimized for space-constrained 12V/24V systems-not rated for 48V+ input or cold-crank | Choose for compact 24V ECU designs where input range ≤36V and current >2A is required |
Compared with LMR38020SQDDARQ1, the LMR38020FSQDDARQ1 adds FPWM for stable frequency at light loads, while the LM61480QRNXTQ1 trades input voltage range and cold-crank capability for higher current and smaller footprint in lower-voltage applications.
Availability
LMR38020SQDDARQ1 is available at Aetrix Electronics and suitable for automotive inverter bias supplies, battery management systems, and 48V mild hybrid ECU designs requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LMR38020SQDDARQ1 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 for automotive, industrial, and communications markets.
The LMR38020SQDDARQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, engineered specifically for rugged 48V/60V/80V battery systems in mild-hybrid, battery management, and motor control applications.
FAQ
What is the maximum input voltage rating for the LMR38020SQDDARQ1?
The LMR38020SQDDARQ1 has an absolute maximum input voltage of 85V and a recommended operating input voltage range of 4.2V to 80V. This wide range supports direct connection to 48V automotive batteries-including cold-crank conditions-and eliminates the need for external surge suppression components in most applications. Operation above 80V is not recommended for reliable long-term performance.
Does the LMR38020SQDDARQ1 support external frequency synchronization?
Yes, the LMR38020SQDDARQ1 supports external frequency synchronization via the RT/SYNC pin, accepting clock signals from 300kHz to 2.1MHz. When an external clock is applied above the PLL upper threshold, the internal oscillator disables and synchronizes to the falling edge of the input signal. This feature enables EMI reduction through coordinated switching in multi-rail systems and avoids interference with sensitive RF or audio bands.
How does the LMR38020SQDDARQ1 handle startup into a prebiased output?
The LMR38020SQDDARQ1 supports startup into a prebiased output without reverse current flow, using internal circuitry that monitors the SW node voltage during enable assertion. This capability prevents damage to downstream capacitors and ensures safe hot-swap operation in redundant power architectures. No external components are required-the function is enabled by default and verified per AEC-Q100 testing.
What thermal performance can be expected from the LMR38020SQDDARQ1 in a typical automotive PCB layout?
In a standard evaluation module layout with the thermal pad soldered to a 2-layer 1oz copper ground plane, the LMR38020SQDDARQ1 achieves a junction-to-ambient thermal resistance (RθJA) of 29°C/W. With no airflow and 75°C ambient, the junction temperature remains below 150°C at full 2A load and 24V input-well within the AEC-Q100 Grade 1 specification. Proper thermal pad soldering and copper fill are essential to replicate this performance.
Is the LMR38020SQDDARQ1 qualified for functional safety applications?
Yes, the LMR38020SQDDARQ1 is functional safety-capable and documented to support ISO 26262 ASIL-B system development. Texas Instruments provides failure mode, effects, and diagnostic analysis (FMEDA) reports, safety manuals, and FIT rate data to aid in safety case development. While the device itself is not ASIL-certified, its architecture-including independent overcurrent, thermal, and UVLO protections-enables integration into ASIL-B compliant power domains.
LMR38020SQDDARQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LMR38020SQDDARQ1 FAQ
1.How can I place an order for LMR38020SQDDARQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR38020SQDDARQ1 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 LMR38020SQDDARQ1 reliable?
The price and inventory of LMR38020SQDDARQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR38020SQDDARQ1 is usually 5 days.
3.What payment methods are accepted for LMR38020SQDDARQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR38020SQDDARQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR38020SQDDARQ1?
LMR38020SQDDARQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR38020SQDDARQ1 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 LMR38020SQDDARQ1?
For technical support, including LMR38020SQDDARQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR38020SQDDARQ1 requirements.
6.How does Aetrix verify that LMR38020SQDDARQ1 is sourced from the original manufacturer or authorized distributors?
All LMR38020SQDDARQ1 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 LMR38020SQDDARQ1 meets industry standards.
7.What is the process for return or replacement of LMR38020SQDDARQ1?
All LMR38020SQDDARQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR38020SQDDARQ1, 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 LMR38020SQDDARQ1 part is unused and in its original packaging.
Return procedure for LMR38020SQDDARQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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