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Texas Instruments LMR38025FSQDRRRQ1
- Part No.:
- LMR38025FSQDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR38025FSQDRRRQ1.pdf
- Description:
- IC REG BUCK ADJ 2.5A 12WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR38025FSQDRRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 2.5A continuous output current across a 4.2V–80V input range, featuring 40µA quiescent current, 200kHz–2.2MHz adjustable switching frequency, and integrated spread spectrum for EMI reduction - deployed in 48V mild hybrid ECU bias supplies and motor control systems.
For engineers reviewing the LMR38025FSQDRRRQ1 datasheet, LMR38025FSQDRRRQ1 pinout, LMR38025FSQDRRRQ1 application, or LMR38025FSQDRRRQ1 equivalent, key selection criteria include its FPWM mode support for low ripple, precision enable with ±1.5% reference tolerance over –40°C to +150°C, and wettable-flank WSON-12 package enabling CIPR25 Class 5 compliance.
Technical Context
The LMR38025FSQDRRRQ1 implements fixed-frequency peak-current mode control with internal compensation, supporting both PFM (for light-load efficiency) and forced PWM (FPWM) modes. Its high-side/low-side MOSFETs feature RDS(on) of 303mΩ and 133mΩ respectively, enabling stable regulation down to 1V output via external feedback divider.
It integrates functional safety documentation support, precision UVLO on EN (1.1V–1.4V enable threshold), and a glitch-filtered open-drain power-good flag with 90–114% FB voltage hysteresis. The RT/SYNC pin enables either resistor-programmed frequency (200kHz–2.2MHz) or external clock synchronization (300kHz–2.1MHz).
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 absolute max. |
| Output Current | 2.5A continuous - sufficient for biasing microcontrollers, gate drivers, and sensors in automotive ECUs without external current boosting. |
| IQ (Non-Switching) | 40µA - enables always-on subsystems (e.g., CAN wake-up circuits) to meet automotive low-power standby requirements. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor or external sync clock to avoid noise-sensitive bands (e.g., AM radio, radar). |
| Reference Voltage Tolerance | ±1.5% over –40°C to +150°C - ensures tight output regulation across full automotive junction temperature range. |
| Duty Cycle Max | 97% - allows operation near dropout (e.g., VIN = 4.5V → VOUT = 3.3V), critical for cold-crank scenarios in 12V/48V systems. |
| Thermal Shutdown | 163°C shutdown / 150°C recovery - protects against sustained overload or poor heatsinking in enclosed automotive enclosures. |
Pinout & Package
LMR38025FSQDRRRQ1 uses a 12-pin WSON (DRR) package with 3mm × 3mm footprint and wettable flanks for automated optical inspection (AOI). The exposed thermal pad (EP) must be soldered to PCB ground plane for optimal thermal performance (RθJA = 54.3°C/W, RθJC(bot) = 4.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 2) | Power and analog ground | Common return for VIN bypass, feedback, and PG; requires low-inductance connection to thermal pad. |
| EN (Pin 3) | Enable control input | Logic-level input (1.1V–1.4V threshold); connects directly to VIN for self-start or to MCU GPIO for sequencing. |
| NC (Pin 4) | No connect | Floating pin - must remain unconnected per datasheet; no internal circuitry attached. |
| VIN (Pins 5, 6) | Main input supply | High-current path for 4.2V–80V input; requires local 10µF+ ceramic capacitor placed adjacent to pins 5/6. |
| RT/SYNC (Pin 7) | Frequency programming or sync input | Configurable as resistor-to-GND (200kHz–2.2MHz) or high-Z clock input (300kHz–2.1MHz); internal PLL locks within 230µs. |
| FB (Pin 8) | Feedback reference node | Connects to mid-point of resistor divider; 1.0V internal reference enables precise adjustable outputs (1V–75V) with ±1.5% tolerance. |
| PG (Pin 9) | Open-drain power-good flag | Asserts low when VOUT drops below 90% or rises above 114% of target; includes 45µs glitch filter and internal 92Ω pull-down. |
| BOOT (Pin 10) | Bootstrap supply for high-side driver | Requires 100nF ceramic capacitor between BOOT and SW; enables NMOS high-side switch operation without external charge pump. |
| SW (Pins 11, 12) | Switch node | High dv/dt node connecting to power inductor; demands short, wide copper pour and minimized loop area to reduce EMI. |
| EP (Thermal Pad) | Thermal and electrical ground | Mandatory solder connection to PCB ground plane; accounts for >90% of heat dissipation in typical layout. |
Key Features
| Feature | Design Value |
|---|---|
| Functional Safety Documentation Support | Includes FIT rate data, failure mode analysis, and diagnostic coverage reports - accelerates ISO 26262 ASIL-B system certification. |
| Spread Spectrum Modulation | Reduces peak EMI emissions by up to 10dB across 150kHz–108MHz band - simplifies CIPR25 Class 5 compliance without added shielding. |
| Prebiased Output Startup | Allows safe startup into precharged output capacitors (e.g., backup rails), preventing reverse current flow and inrush damage. |
| Integrated Compensation Network | Eliminates need for external Type-II/III compensation components - reduces BOM count and design iteration time for stable loop response. |
| Hiccup Mode Short-Circuit Protection | Enters 500ms off-time after fault detection - limits average power dissipation during sustained shorts while enabling automatic recovery. |
Applications
| Automotive Inverter Bias Supply | 48V Mild Hybrid ECU Power |
|---|---|
Use Scenario: Powers gate drivers and isolated ADCs in traction inverter control units operating from 48V battery bus under transient load-dump conditions. IC Role / Device Role / Timing Role: Primary DC/DC regulator providing clean, regulated 3.3V/5V bias to safety-critical control logic and communication interfaces. Use Value: 97% max duty cycle maintains regulation during cold-crank (VIN dips to 4.5V); 40µA IQ extends battery life in sleep mode. | Use Scenario: Supplies auxiliary power to 48V domain ECUs (e.g., DC/DC controller, battery monitor) where space, thermal density, and EMI are constrained. IC Role / Device Role / Timing Role: High-efficiency step-down converter converting 48V nominal to 3.3V/5V for microcontroller and sensor subsystems. Use Value: Spread spectrum + low-parasitic WSON package meets CIPR25 Class 5; FPWM mode ensures <10mVpp ripple at light loads. |
| Automotive Battery Management System | Automotive DC/DC Converter Control Logic |
Use Scenario: Generates isolated bias for cell monitoring ICs and communication transceivers in high-voltage battery packs (up to 80V system voltage). IC Role / Device Role / Timing Role: Input-stage regulator feeding isolated flyback or transformer driver, ensuring robust start-up across wide battery SOC range. Use Value: 4.2V min input enables operation during deep discharge; ±1.5% VREF tolerance guarantees accurate ADC reference voltage over full temperature range. | Use Scenario: Powers control ICs, gate drivers, and status LEDs in multi-output automotive DC/DC modules used in ADAS domain controllers. IC Role / Device Role / Timing Role: Secondary regulator supplying stable 5V to digital logic and analog front-ends synchronized to main converter clock. Use Value: RT/SYNC pin enables frequency lock to master clock (300kHz–2.1MHz), eliminating beat frequencies and improving system-level EMI margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36520SQDRRRQ1 | Lower 65V max input, 2A output, 26µA IQ, same WSON-12 package | Better suited for 12V/24V systems with tighter space constraints; lacks FPWM mode and spread spectrum | Select when input voltage never exceeds 65V and ultra-low IQ is prioritized over EMI robustness. |
| TPS546D24RVFT | 60V max input, 6A output, PMBus interface, 45µA IQ, 16-pin QFN | Supports digital configuration and telemetry; higher current but larger footprint and no AEC-Q100 Grade 1 qualification | Choose for programmable features and telemetry in non-safety-critical 48V subsystems where layout space permits. |
Compared with LMR36520SQDRRRQ1 and TPS546D24RVFT, the LMR38025FSQDRRRQ1 uniquely balances 80V input capability, FPWM+spread spectrum EMI mitigation, and AEC-Q100 Grade 1 qualification - making it the only option qualified for direct integration into 48V mild hybrid main power domains requiring functional safety alignment.
Availability
LMR38025FSQDRRRQ1 is available at Aetrix Electronics and suitable for automotive inverter bias supplies, 48V mild hybrid ECU power, battery management systems, and DC/DC converter control logic requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LMR38025FSQDRRRQ1 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 LMR38025FSQDRRRQ1 belongs to TI's SIMPLE SWITCHER® automotive buck converter family, engineered specifically for high-reliability 48V and dual-battery vehicle architectures demanding wide-input operation, ultra-low quiescent current, and EMI-compliant packaging.
FAQ
What is the maximum input voltage rating for the LMR38025FSQDRRRQ1?
The LMR38025FSQDRRRQ1 has an absolute maximum input voltage rating of 85V across VIN to PGND, with recommended operating range from 4.2V to 80V. This 80V upper limit ensures reliable operation during load-dump transients common in 48V automotive systems while maintaining margin below the 85V absolute maximum.
Does the LMR38025FSQDRRRQ1 support forced PWM (FPWM) mode, and how is it enabled?
Yes, the LMR38025FSQDRRRQ1 supports forced PWM mode to maintain constant switching frequency and minimize output voltage ripple at light loads. FPWM is enabled by selecting the "FS" variant (as in LMR38025FSQDRRRQ1) - no external pin configuration is required. The device automatically operates in FPWM when enabled, unlike the base PFM-only variant.
What package type and thermal characteristics does the LMR38025FSQDRRRQ1 use?
The LMR38025FSQDRRRQ1 uses a 12-pin WSON (DRR) package with 3mm × 3mm footprint and wettable flanks. Its thermal metrics include RθJA = 54.3°C/W (standard JEDEC board), RθJC(bot) = 4.7°C/W, and RθJB = 21.7°C/W - confirming efficient heat transfer through the exposed thermal pad to the PCB ground plane.
How does the LMR38025FSQDRRRQ1 handle startup into a prebiased output?
LMR38025FSQDRRRQ1 supports prebiased output startup by disabling reverse current flow during soft-start. When VOUT is already charged, the low-side FET remains off until the output voltage ramps up, preventing destructive reverse conduction - a critical feature for redundant or hot-plug power domains in automotive ECUs.
Is the LMR38025FSQDRRRQ1 qualified for automotive safety applications, and what documentation is available?
Yes, the LMR38025FSQDRRRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +150°C TJ) and functionally safety-capable. Texas Instruments provides dedicated functional safety documentation including FIT rate calculations, failure mode effects analysis (FMEA), and diagnostic coverage reports - all accessible via the official product folder for ISO 26262 system development.
LMR38025FSQDRRRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 12-WFDFN Exposed Pad
- 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:
- 2.5A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 12-WSON (3x3)
LMR38025FSQDRRRQ1 FAQ
1.How can I place an order for LMR38025FSQDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR38025FSQDRRRQ1 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 LMR38025FSQDRRRQ1 reliable?
The price and inventory of LMR38025FSQDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR38025FSQDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LMR38025FSQDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR38025FSQDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR38025FSQDRRRQ1?
LMR38025FSQDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR38025FSQDRRRQ1 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 LMR38025FSQDRRRQ1?
For technical support, including LMR38025FSQDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR38025FSQDRRRQ1 requirements.
6.How does Aetrix verify that LMR38025FSQDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR38025FSQDRRRQ1 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 LMR38025FSQDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LMR38025FSQDRRRQ1?
All LMR38025FSQDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR38025FSQDRRRQ1, 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 LMR38025FSQDRRRQ1 part is unused and in its original packaging.
Return procedure for LMR38025FSQDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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