My Inquiry
My Account
Texas Instruments LMR38025FS3QDRRRQ1
- Part No.:
- LMR38025FS3QDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR38025FS3QDRRRQ1.pdf
- Description:
- IC REG BUCK 3.3V 2.5A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,728
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMR38025FS3QDRRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 2.5A continuous output at fixed 3.3V, operating from 4.2V to 80V input with 40µA quiescent current and 200kHz–2.2MHz adjustable switching frequency. It integrates synchronous rectification, spread-spectrum EMI reduction, and precision enable for 48V mild-hybrid ECU bias supplies.
For engineers reviewing the LMR38025FS3QDRRRQ1 datasheet, LMR38025FS3QDRRRQ1 pinout, LMR38025FS3QDRRRQ1 application, or LMR38025FS3QDRRRQ1 equivalent, key selection criteria include its FPWM mode for low ripple, 97% max duty cycle enabling deep dropout operation, ±1.5% reference tolerance over –40°C to +150°C, and WSON-12 wettable flank package for automated optical inspection in automotive production.
Technical Context
The LMR38025FS3QDRRRQ1 implements fixed-frequency peak-current mode control with internal compensation, supporting both resistor-programmed (RT pin) and external clock synchronization (300kHz–2.1MHz). Its high-side/low-side MOSFETs feature RDS(on) of 303mΩ and 133mΩ respectively, enabling efficient regulation across wide VIN ranges.
It incorporates precision enable with UVLO thresholds (1.10V–1.25V rising), open-drain power-good flag with 45µs glitch filter and 90–94% falling threshold, thermal shutdown at 163°C with 13°C hysteresis, and hiccup-mode short-circuit protection-designed specifically for automotive transients and start-stop cycling.
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 Voltage | Fixed 3.3V ±1.5% over –40°C to +150°C - eliminates external feedback resistors and reduces BOM count for bias rail applications. |
| Continuous Output Current | 2.5A - sustains full load at TJ = 150°C with proper PCB thermal design using the exposed PowerPAD™. |
| Quiescent Current | 40µA in PFM mode - enables always-on functionality in automotive modules without excessive battery drain. |
| Switching Frequency | 200kHz to 2.2MHz - avoids AM radio band and allows optimization between efficiency (low fSW) and size (high fSW). |
| Duty Cycle Range | Up to 97% - maintains regulation during cold-crank events where VIN dips to 4.2V while delivering 3.3V output. |
| EMI Reduction | Pseudorandom spread spectrum - lowers peak emissions to meet CISPR 25 Class 5 requirements with minimal filtering. |
Pinout & Package
LMR38025FS3QDRRRQ1 uses a 12-pin WSON (DRR) package with 3mm × 3mm footprint and wettable flanks for solder joint inspection. The exposed thermal pad (EP) must be connected to system ground for thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 2) | Power and analog ground | Reference node for all electrical parameters; requires low-inductance connection to input/output capacitors and thermal pad. |
| EN (Pin 3) | Enable input | Logic-controlled startup: high ≥1.25V enables regulator; low ≤0.95V disables with 3µA shutdown current. |
| NC (Pin 4) | No connect | Must remain unconnected; no internal function or bonding wire. |
| VIN (Pins 5, 6) | Main input supply | Accepts 4.2V–80V; requires local 10µF ceramic bypass capacitor placed adjacent to pins 5/6 and GND. |
| RT/SYNC (Pin 7) | Frequency programming/synchronization | Resistor-to-GND sets fSW (200kHz–2.2MHz); external clock (300kHz–2.1MHz) overrides for system-level timing alignment. |
| FB (Pin 8) | Feedback input | Internally tied to 3.3V output for fixed version - must be shorted directly to VOUT pin per datasheet configuration. |
| PG (Pin 9) | Open-drain power-good flag | Asserts high when VOUT is within 90–114% of nominal; includes 45µs glitch filter and automatic hold-low during soft-start. |
| BOOT (Pin 10) | Bootstrap supply | Drives high-side gate; requires 100nF ceramic capacitor between BOOT and SW pins with minimal loop area. |
| SW (Pins 11, 12) | Switch node | Connects to power inductor; high dv/dt node requiring tight layout and separation from sensitive analog traces. |
| EP (Thermal Pad) | Thermal and ground connection | Exposed copper pad under package - must be soldered to ≥4-layer PCB ground plane with ≥4 thermal vias for RθJA = 23.0°C/W (EVM). |
Key Features
| Feature | Design Value |
|---|---|
| FPWM operation mode | Enables constant switching frequency and low output voltage ripple at light loads - critical for noise-sensitive automotive microcontrollers. |
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing conduction losses and board area while improving efficiency by >5% at 1A load. |
| Prebiased output startup support | Allows safe turn-on even when output capacitor is precharged - prevents reverse current flow into the IC during system power sequencing. |
| Wettable flank WSON-12 package | Enables automated optical inspection (AOI) of solder joints on bottom-side terminations - essential for zero-defect automotive manufacturing. |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage data - accelerates ISO 26262 ASIL-B system-level certification. |
Applications
| Automotive Inverter Bias Supply | 48V Mild-Hybrid ECU Power |
|---|---|
Use Scenario: Powers gate drivers and sensors in traction inverter control units exposed to 125°C ambient and load-dump transients. IC Role / Device Role / Timing Role: Primary 3.3V bias rail regulator with 97% duty cycle enabling operation during cold-crank (VIN = 4.2V). Use Value: Eliminates need for external surge suppressors due to 80V operating range and integrated thermal/short-circuit protection. | Use Scenario: Supplies MCU, CAN transceivers, and ADCs in 48V battery management ECUs operating continuously in engine bay environments. IC Role / Device Role / Timing Role: Always-on 3.3V regulator with 40µA IQ ensuring <10µA system standby current in sleep mode. Use Value: Wettable flank WSON-12 package ensures AOI-compatible assembly for zero-defect automotive production requirements. |
| Automotive DC/DC Converter Core | Automotive Battery Management System |
Use Scenario: Serves as secondary stage in multi-rail power architecture converting 12V or 48V to isolated 3.3V for communication interfaces. IC Role / Device Role / Timing Role: Fixed-output buck controller with FPWM mode maintaining stable 3.3V under dynamic CAN FD bus loading. Use Value: Spread-spectrum EMI reduction meets CISPR 25 Class 5 without added ferrite beads or shielding. | Use Scenario: Provides regulated 3.3V to cell monitoring ICs and isolation barriers in high-voltage battery packs (up to 800V total). IC Role / Device Role / Timing Role: High-input-voltage buck regulator with AEC-Q100 Grade 1 qualification for under-hood deployment. Use Value: ±1.5% reference tolerance over –40°C to +150°C ensures accurate ADC reference voltage across full automotive temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR38025FS5QDRRRQ1 | Fixed 5V output; identical FPWM, spread-spectrum, and package | Used where 5V logic rails or USB-powered peripherals require regulation | Select when system architecture mandates 5V bias instead of 3.3V - no layout changes required. |
| LMR36520S3QDRRRQ1 | Lower 65V max VIN, 2A output, 26µA IQ, same WSON-12 package | Suitable for 12V/24V systems without 48V compatibility needs | Choose for cost-optimized 24V automotive modules where 80V rating is unnecessary and lower IQ is prioritized. |
Compared with LMR38025FS5QDRRRQ1, the LMR38025FS3QDRRRQ1 provides tighter regulation for 3.3V logic domains; compared with LMR36520S3QDRRRQ1, it delivers higher current and wider input range essential for 48V MHEV platforms - making it the only option qualified for full 48V cold-crank and load-dump compliance.
Availability
LMR38025FS3QDRRRQ1 is available at Aetrix Electronics and suitable for automotive inverter bias supplies, 48V mild-hybrid ECU power, and battery management system applications requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LMR38025FS3QDRRRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive-grade power management ICs and functional safety solutions.
The LMR38025-Q1 product line delivers high-voltage synchronous buck converters optimized for automotive 48V architectures, featuring AEC-Q100 Grade 1 qualification, spread-spectrum EMI control, and robust transient response for engine bay and battery pack environments.
FAQ
What is the output voltage configuration of the LMR38025FS3QDRRRQ1?
The LMR38025FS3QDRRRQ1 is factory-configured for fixed 3.3V output. Unlike adjustable variants, its FB pin is internally connected to the output, eliminating external feedback resistors. This configuration achieves ±1.5% output tolerance over –40°C to +150°C junction temperature and simplifies layout for automotive bias rail applications.
Does the LMR38025FS3QDRRRQ1 support synchronization to an external clock?
Yes, the LMR38025FS3QDRRRQ1 supports external clock synchronization via the RT/SYNC pin. When driven with a square wave between 300kHz and 2.1MHz, the internal oscillator locks to the external signal's falling edge. This capability enables precise timing alignment across multiple converters in automotive domain controllers, reducing beat-frequency noise and easing EMI compliance testing.
How does the LMR38025FS3QDRRRQ1 handle cold-crank conditions in 48V automotive systems?
The LMR38025FS3QDRRRQ1 maintains regulation during cold-crank events by operating up to 97% duty cycle when input voltage drops to 4.2V. Its wide 4.2V–80V input range and ability to sustain 2.5A output at minimum VIN ensure uninterrupted 3.3V supply to critical ECUs - a requirement verified under AEC-Q100 Grade 1 test conditions from –40°C to +150°C.
What thermal management provisions are required for the LMR38025FS3QDRRRQ1 in automotive applications?
The LMR38025FS3QDRRRQ1 requires connection of its exposed thermal pad (EP) to a multilayer PCB ground plane using ≥4 thermal vias. With this implementation, effective junction-to-ambient thermal resistance drops to 23.0°C/W (per EVM data), enabling full 2.5A output at +125°C ambient. Failure to implement proper thermal relief risks triggering 163°C thermal shutdown during sustained high-load operation.
Is the LMR38025FS3QDRRRQ1 compatible with WEBENCH® Power Designer?
Yes, the LMR38025FS3QDRRRQ1 is fully supported in TI's WEBENCH® Power Designer tool. Engineers can generate complete schematic and bill-of-materials, simulate efficiency and thermal performance, optimize loop stability, and export design files directly - including validated layouts for the 3mm × 3mm WSON-12 package and recommended component values for 3.3V fixed-output operation.
LMR38025FS3QDRRRQ1 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 80V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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)
LMR38025FS3QDRRRQ1 FAQ
1.How can I place an order for LMR38025FS3QDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR38025FS3QDRRRQ1 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 LMR38025FS3QDRRRQ1 reliable?
The price and inventory of LMR38025FS3QDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR38025FS3QDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LMR38025FS3QDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR38025FS3QDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR38025FS3QDRRRQ1?
LMR38025FS3QDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR38025FS3QDRRRQ1 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 LMR38025FS3QDRRRQ1?
For technical support, including LMR38025FS3QDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR38025FS3QDRRRQ1 requirements.
6.How does Aetrix verify that LMR38025FS3QDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR38025FS3QDRRRQ1 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 LMR38025FS3QDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LMR38025FS3QDRRRQ1?
All LMR38025FS3QDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR38025FS3QDRRRQ1, 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 LMR38025FS3QDRRRQ1 part is unused and in its original packaging.
Return procedure for LMR38025FS3QDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR38025FS3QDRRRQ1 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
