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Texas Instruments LMR38015SQDRRRQ1
- Part No.:
- LMR38015SQDRRRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LMR38015SQDRRRQ1.pdf
- Description:
- IC REG BUCK ADJ 1.5A 12WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,076
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Product details
Overview
LMR38015SQDRRRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 1.5A continuous output current, operating from 4.2V to 80V input, with 40µA quiescent current and adjustable 200kHz–2.2MHz switching frequency. It integrates high- and low-side MOSFETs (RDS(on) = 303mΩ / 133mΩ), supports prebiased start-up, and targets 48V mild-hybrid ECU bias supplies.
For engineers reviewing the LMR38015SQDRRRQ1 datasheet, LMR38015SQDRRRQ1 pinout, LMR38015SQDRRRQ1 application, or LMR38015SQDRRRQ1 equivalent, key selection criteria include its ultra-low IQ, spread-spectrum EMI reduction, precision enable with UVLO control, and integrated power-good flag with glitch filtering - all validated for –40°C to +150°C junction operation.
Technical Context
The LMR38015SQDRRRQ1 employs fixed-frequency peak-current mode control with internal compensation, enabling stable regulation across wide VIN and VOUT ranges without external loop components. Its dual-mode operation (PFM for light-load efficiency, FPWM for constant frequency and low ripple) is selected via configuration - this specific variant (LMR38015SQDRRRQ1) is the adjustable-output, spread-spectrum-enabled, non-FPWM version.
It features a high-voltage EN pin (1.1V–1.4V logic thresholds), RT/SYNC pin supporting both resistor-programmed frequency (200kHz–2.2MHz) and external clock synchronization (300kHz–2.1MHz), and a true open-drain PG flag with 92%–112% VFB thresholds and 45µs glitch filter. Thermal shutdown triggers at 163°C with 13°C 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 load-dump transients up to 85V absolute max. |
| Output Current | 1.5A continuous - rated across full –40°C to +150°C TJ; derating applies above 200kHz or elevated ambient. |
| Quiescent Current | 40µA - enables always-on systems (e.g., vehicle wake-up circuits) with minimal battery drain in sleep mode. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor or external SYNC clock; avoids AM band and enables compact magnetics. |
| Feedback Reference | 1.0V ±1.5% over temperature - sets precise output voltage via external resistor divider; enables 1V–75V adjustable VOUT. |
| Power-Good Flag | Open-drain PG with 92%–112% VFB thresholds and 45µs glitch filter - provides reliable system status indication without external supervisor IC. |
| Thermal Shutdown | 163°C shutdown / 150°C recovery - protects against sustained overload or poor heatsinking in confined automotive enclosures. |
Pinout & Package
LMR38015SQDRRRQ1 uses a 12-pin WSON (DRR) package with 3mm × 3mm footprint and wettable flanks for automated optical inspection. The exposed thermal pad (EP) must be soldered to PCB ground for thermal performance (RθJA = 54.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 2) | Power and analog ground | Primary return path for input/output currents and feedback reference; requires low-inductance connection to VIN and FB bypass capacitors. |
| EN (Pin 3) | Enable control input | Logic-level input (1.1V–1.4V threshold); connects directly to VIN for self-start or to MCU for sequencing; not floatable. |
| NC (Pin 4) | No-connect | Internally unconnected; must remain floating - no routing or soldering required. |
| VIN (Pins 5, 6) | Main input power supply | High-current input node; requires local 10µF+ ceramic capacitor placed adjacent to pins with short, wide traces to GND. |
| RT/SYNC (Pin 7) | Frequency programming or sync input | Configures switching frequency via RT-to-GND resistor (e.g., 64.9kΩ for 400kHz) or accepts external 300kHz–2.1MHz clock signal. |
| FB (Pin 8) | Feedback voltage sense | Monitors VOUT via resistor divider; 1.0V reference enables precise output setting; leakage <2.1nA minimizes divider error. |
| PG (Pin 9) | Open-drain power-good flag | Asserts low during fault (OVP/UVP/thermal/shutdown); requires external pull-up; glitch-filtered to ignore transient excursions. |
| BOOT (Pin 10) | Bootstrap supply for high-side driver | Connects via 100nF ceramic capacitor to SW; critical for proper high-side NMOS gate drive; sensitive to layout parasitics. |
| SW (Pins 11, 12) | Switch node | High dv/dt node connecting internal HS/LS FETs to external inductor; requires minimized loop area to reduce EMI and ringing. |
| EP (Thermal Pad) | Thermal and electrical ground | Must be soldered to solid GND plane; accounts for >90% of heat dissipation; improves RθJB to 21.7°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | Reduces peak EMI emissions by spreading oscillator energy across ±8% bandwidth - aids CIPR25 Class 5 compliance without added filters. |
| Prebiased output start-up | Allows safe turn-on when VOUT is already biased (e.g., by backup rail), preventing reverse current flow into the output capacitor. |
| Integrated synchronous rectification | Eliminates external Schottky diode; achieves >90% efficiency at 1A/5V (400kHz) while reducing BOM count and board space. |
| Precision enable with UVLO | EN pin thresholds (1.1V–1.4V) enable accurate system-level undervoltage lockout using simple resistor divider - no external comparator needed. |
| Internal soft-start | 4.2ms monotonic ramp prevents inrush current and output overshoot during power-up - eliminates need for external soft-start circuitry. |
| Low parasitic WSON package | Wettable flank 12-pin WSON minimizes trace inductance on VIN, SW, and BOOT nodes - critical for stable high-frequency operation and EMI control. |
Applications
| Automotive Inverter Bias Supply | 48V Mild-Hybrid ECU Power |
|---|---|
|
Use Scenario: Powers gate drivers and MCU in 400V/800V traction inverter control units where input is tapped from 48V auxiliary bus. IC Role / Device Role / Timing Role: Primary 5V/3.3V point-of-load regulator supplying isolated gate-driver bias and microcontroller core voltage. Use Value: 4.2V–80V input range handles cold-crank dips and load-dump surges; 40µA IQ extends battery standby time between ignition cycles. |
Use Scenario: Supplies 3.3V/5V rails for battery management system (BMS) controllers and CAN transceivers in 48V MHEV architectures. IC Role / Device Role / Timing Role: High-reliability DC/DC converter delivering regulated bias power to safety-critical monitoring and communication subsystems. Use Value: AEC-Q100 Grade 1 qualification and 150°C TJ rating ensure operation in under-hood environments; spread spectrum reduces interference with sensitive ADCs and sensors. |
| Automotive DC/DC Converter Stage | Motor Control Module Power |
|
Use Scenario: Serves as intermediate stage converting 48V to 12V for legacy infotainment and lighting loads in multi-rail vehicle architectures. IC Role / Device Role / Timing Role: Efficient step-down regulator enabling scalable power distribution without discrete high-voltage MOSFETs and controllers. Use Value: 97% max duty cycle supports dropout operation down to 4.2V input - maintains 12V output during deep battery discharge events. |
Use Scenario: Provides isolated 5V supply for position sensor interfaces and motor phase current sensing amplifiers in EPS and HVAC blower modules. IC Role / Device Role / Timing Role: Compact, EMI-optimized power source for analog front-end circuitry requiring low noise and tight regulation. Use Value: Integrated PG flag replaces external supervisor IC; ±1.5% VREF tolerance ensures consistent sensor bias accuracy across temperature. |
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 | Fixed 5V output; same 4.2V–80V input, 1.5A, spread-spectrum, non-FPWM | Eliminates FB resistor divider; suited for single-rail 5V systems without output adjustability | Select when output voltage is fixed and board space for feedback network must be minimized. |
| LMR38025SQDRRRQ1 | 2.5A output current; identical package, input range, IQ, and feature set | Supports higher-power ECUs (e.g., ADAS domain controllers) requiring >1.5A at 3.3V/5V | Select when load current exceeds 1.5A but layout and thermal constraints require same 3mm×3mm footprint. |
Compared with LMR38015SQDRRRQ1, the LMR38015S5QDRRRQ1 removes output adjustability to simplify design for fixed 5V use cases, while the LMR38025SQDRRRQ1 scales current capability to 2.5A within identical thermal and layout boundaries - enabling drop-in power upgrades without redesign.
Availability
LMR38015SQDRRRQ1 is available at Aetrix Electronics and suitable for automotive inverter bias supplies, 48V mild-hybrid ECU power, and motor control module designs requiring stable component supply across extended temperature and long lifecycle commitments.
Supply support for LMR38015SQDRRRQ1 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.
The LMR38015SQDRRRQ1 belongs to TI's SIMPLE SWITCHER® automotive power converter family, designed specifically for rugged, high-input-voltage DC/DC conversion in engine bay and chassis-mounted electronic control units.
FAQ
What is the maximum input voltage rating for the LMR38015SQDRRRQ1?
The LMR38015SQDRRRQ1 has an absolute maximum input voltage rating of 85V, with recommended operating range from 4.2V to 80V. This allows it to withstand automotive load-dump transients while maintaining regulation during cold-crank events down to 4.2V - making it suitable for 48V mild-hybrid systems. The device remains functional across its full –40°C to +150°C junction temperature range under these conditions.
Does the LMR38015SQDRRRQ1 support external frequency synchronization?
Yes, the LMR38015SQDRRRQ1 supports external clock synchronization via the RT/SYNC pin, accepting square-wave inputs from 300kHz to 2.1MHz. When driven above the PLL upper threshold (~2V), the internal oscillator disables and the pin becomes a high-impedance clock input synchronized on falling edges. The LMR38015SQDRRRQ1 also retains resistor-programmable frequency (200kHz–2.2MHz) when not synchronized.
How does the power-good (PG) flag behave during startup and fault conditions?
The LMR38015SQDRRRQ1 PG pin is an open-drain output that remains low during soft-start and asserts high only after VOUT reaches regulation (within 92%–112% of target). It pulls low during faults including thermal shutdown, overcurrent hiccup, or output undervoltage/overvoltage. A built-in 45µs glitch filter prevents false triggering from transient line/load disturbances - ensuring robust system monitoring without external supervision.
Can the LMR38015SQDRRRQ1 operate with a prebiased output voltage?
Yes, the LMR38015SQDRRRQ1 supports prebiased output start-up, allowing safe turn-on when the output capacitor is already charged (e.g., by a backup rail or another converter). During start-up, the device prevents reverse current flow into the output by controlling gate drive timing - eliminating risk of damage or instability. This feature is enabled by default and requires no external configuration.
What thermal performance can be expected from the LMR38015SQDRRRQ1 in a typical automotive PCB layout?
In a standard 4-layer PCB with 2oz copper and the thermal pad fully soldered to an internal GND plane, the LMR38015SQDRRRQ1 achieves RθJA ≈ 23.0°C/W (effective) and RθJB = 21.7°C/W. At 1.5A output and 24V input, typical power dissipation is ~0.5W, resulting in ~11.5°C rise above ambient - well within the 150°C max junction limit. Layout best practices (short high-current paths, thermal vias under EP) are essential to maintain this performance.
LMR38015SQDRRRQ1 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:
- 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:
- 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)
LMR38015SQDRRRQ1 FAQ
1.How can I place an order for LMR38015SQDRRRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR38015SQDRRRQ1 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 LMR38015SQDRRRQ1 reliable?
The price and inventory of LMR38015SQDRRRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR38015SQDRRRQ1 is usually 5 days.
3.What payment methods are accepted for LMR38015SQDRRRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR38015SQDRRRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR38015SQDRRRQ1?
LMR38015SQDRRRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR38015SQDRRRQ1 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 LMR38015SQDRRRQ1?
For technical support, including LMR38015SQDRRRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR38015SQDRRRQ1 requirements.
6.How does Aetrix verify that LMR38015SQDRRRQ1 is sourced from the original manufacturer or authorized distributors?
All LMR38015SQDRRRQ1 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 LMR38015SQDRRRQ1 meets industry standards.
7.What is the process for return or replacement of LMR38015SQDRRRQ1?
All LMR38015SQDRRRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR38015SQDRRRQ1, 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 LMR38015SQDRRRQ1 part is unused and in its original packaging.
Return procedure for LMR38015SQDRRRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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