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Texas Instruments LMR38015FS5QDRRRQ1
- Part No.:
- LMR38015FS5QDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR38015FS5QDRRRQ1.pdf
- Description:
- IC REG BUCK 5V 1.5A 12WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LMR38015FS5QDRRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 1.5A continuous output at fixed 5V, operating from 4.2V to 80V input with 40µA quiescent current and FPWM mode for constant-frequency light-load operation - used in 48V mild-hybrid ECU bias supplies.
For engineers reviewing the LMR38015FS5QDRRRQ1 datasheet, LMR38015FS5QDRRRQ1 pinout, LMR38015FS5QDRRRQ1 application, or LMR38015FS5QDRRRQ1 equivalent, key selection criteria include its 97% max duty cycle for cold-crank support, spread-spectrum EMI reduction, integrated compensation, and wettable-flank WSON-12 package for automated optical inspection.
Technical Context
The LMR38015FS5QDRRRQ1 implements fixed-frequency peak-current mode control with internal compensation, enabling stable regulation across wide VIN (4.2–80V) and load (0–1.5A) ranges without external loop components. Its FPWM mode enforces constant 200–2.2MHz switching frequency down to zero load, eliminating PFM-induced output voltage ripple and frequency modulation artifacts.
It integrates high-side (303mΩ) and low-side (133mΩ) NMOS power switches, precision enable with 1.1–1.4V hysteresis, open-drain power-good flag with 45µs glitch filter, and RT/SYNC pin supporting both resistor-programmed frequency and external clock synchronization from 300kHz to 2.1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2V to 80V - supports automotive 12V/24V/48V battery systems including cold-crank dips to 4.2V. |
| Output Voltage | Fixed 5.0V ±1.5% over –40°C to +150°C - eliminates external feedback resistors; enables direct microcontroller I/O rail supply. |
| Continuous Output Current | 1.5A - sufficient for powering multiple automotive ECUs, sensors, and CAN transceivers from a single regulator. |
| Quiescent Current | 40µA in non-switching PFM mode - extends battery life during vehicle sleep modes without compromising wake-up response. |
| Switching Frequency | 200kHz to 2.2MHz adjustable via RT resistor or external SYNC clock - avoids AM radio band and enables compact magnetics. |
| Max Duty Cycle | 97% - sustains regulation during deep input voltage sags (e.g., 48V system dropping to ~5V), critical for MHEV start-stop events. |
| Thermal Shutdown | 163°C shutdown / 150°C recovery - protects against sustained overload or poor heatsinking in under-hood environments. |
Pinout & Package
LMR38015FS5QDRRRQ1 uses a 12-pin WSON (DRR) package with 3mm × 3mm footprint and wettable flanks for solder-joint inspection. The PowerPAD™ thermal pad (EP) must be connected to PCB ground for thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 2) | Power and analog ground reference | Primary return path for input/output currents and feedback reference; requires low-inductance connection to bulk capacitors. |
| EN (Pin 3) | Enable control input | Logic-level input with 1.1–1.4V hysteresis; connects directly to VIN for self-start or to MCU GPIO for sequencing. |
| NC (Pin 4) | No-connect terminal | Must remain unconnected; no internal circuitry or bond wire attached. |
| VIN (Pins 5, 6) | Main input power supply | High-current input node requiring local 10µF+ ceramic bypass capacitor placed within 3mm of pins. |
| RT/SYNC (Pin 7) | Frequency programming or sync input | Configurable as resistor-to-GND (200–2200kHz) or high-Z clock input (300–2100kHz); internal PLL locks in <230µs. |
| FB (Pin 8) | Feedback reference input | Internally tied to 5V output for fixed-version operation; must connect directly to VOUT pin - no external divider needed. |
| PG (Pin 9) | Open-drain power-good flag | Asserts high after soft-start completion when VOUT reaches 92–112% of nominal; includes 45µs glitch filter. |
| BOOT (Pin 10) | High-side gate driver bootstrap | Requires 100nF X7R ceramic capacitor between BOOT and SW; critical for reliable high-side MOSFET turn-on. |
| SW (Pins 11, 12) | Power switch node | Connects to power inductor; carries high di/dt switching current - demands short, wide copper traces and ground plane clearance. |
| EP (Thermal Pad) | Exposed thermal and ground connection | Mandatory solder connection to large PCB ground plane; improves θJA by >30°C/W vs. no-pad layout. |
Key Features
| Feature | Design Value |
|---|---|
| FPWM operation mode | Enables constant switching frequency and tight output voltage regulation (<±1.5%) at all loads - essential for noise-sensitive automotive sensors and ADC references. |
| Spread-spectrum modulation | Reduces peak EMI emissions by up to 8% - simplifies compliance with CISPR 25 Class 5 requirements without added shielding or filtering. |
| Integrated synchronous rectification | Eliminates external Schottky diode; achieves >90% efficiency at 1A/5V from 12V input - reduces BOM count and thermal footprint. |
| Precision enable with UVLO hysteresis | Provides clean startup/shutdown sequencing with 1.1–1.4V threshold window - prevents brown-out oscillation during battery voltage recovery. |
| Internal soft-start (4.2ms) | Controls inrush current during power-up; eliminates output overshoot and stress on downstream capacitors and ICs. |
| Pre-biased output start-up support | Allows safe turn-on even when VOUT is pre-charged (e.g., back-fed from other rails) - prevents reverse current damage to internal FETs. |
Applications
| Automotive Inverter Bias Supply | 48V Mild-Hybrid ECU Power Rail |
|---|---|
|
Use Scenario: Supplies isolated gate drivers and MCU cores in traction inverter control units exposed to under-hood temperatures up to +150°C. IC Role / Device Role / Timing Role: Primary 5V bias regulator converting 48V battery to logic-level rail; maintains regulation during 4.2V cold-crank events. Use Value: 97% max duty cycle and AEC-Q100 Grade 1 qualification ensure uninterrupted operation during engine cranking and thermal stress. |
Use Scenario: Powers communication interfaces (CAN FD, LIN), sensor signal conditioners, and safety monitors in 48V MHEV battery management modules. IC Role / Device Role / Timing Role: Fixed-output synchronous buck providing low-noise 5V rail with FPWM mode to suppress switching artifacts near high-resolution ADCs. Use Value: 40µA IQ extends sleep-mode battery life; spread spectrum meets CISPR 25 Class 5 without added EMI filters. |
| Automotive DC/DC Converter Auxiliary Rail | Automotive Battery Management System (BMS) |
|
Use Scenario: Generates auxiliary 5V rail for supervisory circuits, EEPROM, and real-time clocks in multi-output automotive DC/DC converters. IC Role / Device Role / Timing Role: Secondary regulator fed from main converter's intermediate bus; operates independently across full input range. Use Value: Wide 4.2–80V input range accommodates variable bus voltages; integrated compensation reduces design iteration time. |
Use Scenario: Supplies power to cell monitoring ICs, isolation barriers, and fault-detection logic in high-voltage battery packs. IC Role / Device Role / Timing Role: Safety-critical bias supply with power-good flag confirming valid 5V before enabling cell balancing or communication. Use Value: Open-drain PG output with built-in delay provides reliable system status indication - eliminates need for external supervisor IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR38015S5QDRRRQ1 | Same 5V fixed output, but PFM-only (no FPWM mode); lacks forced PWM capability. | Suitable for non-noise-sensitive loads where light-load efficiency > ripple control; cannot maintain constant frequency below 100mA. | Select when lowest possible IQ dominates over output voltage stability and EMI predictability. |
| LMR36515QDRRRQ1 | Lower 3.5–36V input range; same 1.5A/5V output; 26µA IQ; no spread spectrum or SYNC capability. | Targeted at 12V/24V-only systems; insufficient for 48V MHEV applications requiring 80V absolute max rating. | Choose only for cost-optimized 12V automotive modules without 48V compatibility or EMI certification needs. |
Compared with LMR38015S5QDRRRQ1 and LMR36515QDRRRQ1, the LMR38015FS5QDRRRQ1 uniquely combines 80V input capability, FPWM mode for deterministic noise behavior, and spread-spectrum EMI reduction - making it the only option qualified for demanding 48V mild-hybrid bias rail designs requiring functional safety support.
Availability
LMR38015FS5QDRRRQ1 is available at Aetrix Electronics and suitable for automotive inverter bias supplies, 48V mild-hybrid ECU power rails, and battery management system auxiliary power requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LMR38015FS5QDRRRQ1 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 ICs, with decades of AEC-Q100 qualification experience and functional safety documentation support.
The LMR38015-Q1 family was designed specifically for rugged automotive power conversion - targeting 48V mild-hybrid, battery management, and motor control applications where wide-input, low-IQ, and EMI-compliant operation are mandatory.
FAQ
What is the maximum input voltage rating for the LMR38015FS5QDRRRQ1?
The LMR38015FS5QDRRRQ1 has an absolute maximum input voltage rating of 85V, with recommended operating range from 4.2V to 80V. This allows robust operation during 48V system transients and cold-crank events while maintaining regulation down to 4.2V input - a key requirement for automotive MHEV applications.
Does the LMR38015FS5QDRRRQ1 require external feedback resistors for its 5V output?
No. The LMR38015FS5QDRRRQ1 is the fixed 5V version - its FB pin is internally connected to the output, eliminating the need for external feedback resistors. Pin 8 (FB) must be connected directly to the VOUT net per datasheet guidance; adding external dividers will disrupt regulation.
How does FPWM mode improve system performance compared to PFM in the LMR38015FS5QDRRRQ1?
FPWM mode in the LMR38015FS5QDRRRQ1 forces constant switching frequency across all load conditions, eliminating PFM-induced output voltage ripple and frequency modulation. This ensures predictable EMI behavior, tighter output regulation (±1.5%), and compatibility with noise-sensitive automotive sensors and high-resolution ADCs.
Can the LMR38015FS5QDRRRQ1 synchronize to an external clock, and what are the timing requirements?
Yes - the RT/SYNC pin supports external clock synchronization from 300kHz to 2.1MHz. Valid clock signals require high level ≥2.0V, low level ≤0.6V, and minimum high pulse width ≥50ns. The internal PLL locks within 230µs, and the pin automatically reverts to resistor-programmed mode if clock stops.
What thermal performance can be expected from the LMR38015FS5QDRRRQ1 in a typical automotive PCB layout?
In a standard 4-layer PCB with 2oz copper and 200mm² thermal pad copper area, the LMR38015FS5QDRRRQ1 achieves ~23°C/W effective junction-to-ambient thermal resistance. With proper thermal pad soldering and ground plane connectivity, it sustains 1.5A continuous output at +125°C ambient without thermal shutdown.
LMR38015FS5QDRRRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- 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)
LMR38015FS5QDRRRQ1 FAQ
1.How can I place an order for LMR38015FS5QDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR38015FS5QDRRRQ1 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 LMR38015FS5QDRRRQ1 reliable?
The price and inventory of LMR38015FS5QDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR38015FS5QDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LMR38015FS5QDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR38015FS5QDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR38015FS5QDRRRQ1?
LMR38015FS5QDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR38015FS5QDRRRQ1 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 LMR38015FS5QDRRRQ1?
For technical support, including LMR38015FS5QDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR38015FS5QDRRRQ1 requirements.
6.How does Aetrix verify that LMR38015FS5QDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR38015FS5QDRRRQ1 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 LMR38015FS5QDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LMR38015FS5QDRRRQ1?
All LMR38015FS5QDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR38015FS5QDRRRQ1, 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 LMR38015FS5QDRRRQ1 part is unused and in its original packaging.
Return procedure for LMR38015FS5QDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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