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Texas Instruments LMR36503MSCQRPERQ1
- Part No.:
- LMR36503MSCQRPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR36503MSCQRPERQ1.pdf
- Description:
- IC REG BUCK ADJ 300MA 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,437
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Product details
Overview
LMR36503MSCQRPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering 0.3 A output at 3.3 V or 5 V fixed/adjustable voltages, operating from 3.0 V to 65 V input with 4 µA switching quiescent current and 2.2 MHz fixed-frequency operation in a 2-mm × 2-mm HotRod™ VQFN-HR (9-pin) package - optimized for ADAS power rails requiring cold-crank resilience and low EMI.
For engineers reviewing the LMR36503MSCQRPERQ1 datasheet, LMR36503MSCQRPERQ1 pinout, LMR36503MSCQRPERQ1 application, or LMR36503MSCQRPERQ1 equivalent, key selection criteria include its 70 V transient tolerance, PGOOD flag with 2.16 ms activation delay, MODE/SYNC pin for external clock synchronization, pseudo-random spread spectrum compliance with CISPR 25, and seamless FPWM-to-PFM transition enabling >70% efficiency at 5 mA load.
Technical Context
The LMR36503MSCQRPERQ1 implements peak current mode control with internal compensation, supporting stable regulation down to minimal output capacitance and enabling compact layout. Its MODE/SYNC pin allows user-selectable PFM/FPWM operation and synchronization to external clocks from 200 kHz to 2.2 MHz.
It features integrated high- and low-side MOSFETs (RDS(on) = 920 mΩ / 460 mΩ), thermal shutdown (158–180 °C rising), and a precision enable input with 1.263 V threshold and 0.35 V hysteresis - all qualified for junction temperatures from –40 °C to +150 °C per AEC-Q100.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V (falling) to 65 V - sustains regulation during automotive cold-crank sags down to 3.0 V |
| Output Current | 0.3 A continuous - supports low-power domain supplies in infotainment and body control modules |
| Switching Frequency | Fixed 2.2 MHz - enables compact magnetics and avoids AM-band interference |
| IQ (Switching) | 4 µA at 24 VIN/3.3 VOUT - extends battery runtime in always-on vehicle subsystems |
| Efficiency @ 5 mA | >70% - maintains usable conversion efficiency under ultra-light loads typical of sensor bias rails |
| PGOOD Delay | 1.956 ms typical - provides deterministic power-good assertion timing for system sequencing |
| Thermal Shutdown | Rising threshold 158–180 °C - protects against sustained overload or poor PCB thermal design |
| EMI Compliance | Pseudo-random spread spectrum - meets CISPR 25 Class 5 radiated emissions without external filters |
Pinout & Package
Package: VQFN-HR (9-pin), 2.00 mm × 2.00 mm, wettable flanks, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MODE/SYNC | Configurable digital interface | Selects PFM/FPWM mode or synchronizes switching to external clock (200 kHz–2.2 MHz) |
| 2 - PGOOD | Open-drain status flag | Asserts high when VOUT is within ±2.5% of target - eliminates need for external supervisor IC |
| 3 - EN/UVLO | Enable & undervoltage lockout | Starts regulation at 1.263 V; hysteresis ensures clean turn-on/turn-off during supply transients |
| 4 - VIN | Main power input | Accepts 3–65 V; withstands 70 V transients - suitable for direct battery connection |
| 5 - SW | Power switch node | Connects to external inductor; integrates high- and low-side MOSFETs with internal current sensing |
| 6 - BOOT | Bootstrap supply | Requires 100 nF capacitor to SW - enables high-side gate drive without external charge pump |
| 7 - VCC | Internal LDO output | 3.15 V regulated supply for control circuitry; not for external loading |
| 8 - VOUT/BIAS | Fixed-output voltage sense | Factory-trimmed for 3.3 V or 5 V output - no external feedback divider required |
| 9 - GND | Power ground | Low-inductance return path; must be connected to CIN with short, wide traces |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40 °C to +125 °C ambient operation - meets automotive reliability and lifetime requirements |
| Integrated spread spectrum | ±2% frequency dithering - reduces peak EMI by >10 dB without layout or BOM changes |
| HotRod™ packaging | Wettable flanks + corner anchor pins - enables automated optical inspection and improves solder joint reliability |
| Internal compensation | No external Type II/III compensation network needed - cuts bill-of-materials and simplifies layout |
| Ultra-low IQ in PFM | 4 µA at 24 VIN/3.3 VOUT - extends sleep-mode battery life in telematics and ADAS sensors |
| Seamless light-load transition | Automatic FPWM-to-PFM mode switching - maintains >70% efficiency from 5 mA to full load |
Applications
| ADAS Camera Power Supply | Automotive Infotainment Core Rail |
|---|---|
Use Scenario: Powers image sensor and ISP in forward-facing camera module exposed to engine bay temperature extremes and battery transients. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator with cold-crank hold-up and PGOOD sequencing signal for SoC reset management. Use Value: Withstands 3.0 V input sag during cranking and delivers >70% efficiency at 5 mA standby current - reducing thermal load on sealed camera housing. |
Use Scenario: Supplies 5 V core rail to display processor and audio codec in center-stack infotainment head unit. IC Role / Device Role / Timing Role: Fixed-output synchronous buck converter with MODE/SYNC pin synchronized to system clock tree to suppress beat frequencies. Use Value: 2.2 MHz fixed switching frequency avoids AM band interference; spread spectrum ensures CISPR 25 Class 5 compliance without shielding. |
| Body Control Module (BCM) Sensor Bias | LED Lighting Driver Auxiliary Supply |
Use Scenario: Generates stable 3.3 V bias for door module microcontroller, LIN transceiver, and position sensors. IC Role / Device Role / Timing Role: Always-on buck regulator with ultra-low IQ, EN-controlled wake-up, and PGOOD monitoring for MCU brownout detection. Use Value: 4 µA quiescent current minimizes parasitic drain on 12 V battery during vehicle sleep mode - extending key-off duration beyond 30 days. |
Use Scenario: Provides isolated 5 V auxiliary supply for LED driver IC logic and communication interface in adaptive front lighting system (AFS). IC Role / Device Role / Timing Role: Compact, high-input-voltage buck stage upstream of LED driver - handles 65 V load-dump transients per ISO 7637-2. Use Value: 70 V absolute maximum input rating and thermal shutdown protect against load-dump events without external TVS clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR36503MSC3RPERQ1 | 3.3 V fixed output; same MODE/SYNC pin, 2.2 MHz, spread spectrum | Identical pinout and feature set - differs only in factory-trimmed VOUT/BIAS pin for 3.3 V | Select when 3.3 V output is required without external feedback resistors |
| LMR36503MSC5RPERQ1 | 5 V fixed output; same MODE/SYNC pin, 2.2 MHz, spread spectrum | Same package, thermal specs, and EMI performance - differs only in factory-trimmed VOUT/BIAS pin for 5 V | Select when 5 V output is required and board layout must remain unchanged |
Compared with LMR36503MSC3RPERQ1 and LMR36503MSC5RPERQ1, the LMR36503MSCQRPERQ1 offers identical MODE/SYNC functionality and EMI performance but requires external feedback resistors for adjustable output - providing design flexibility where multiple output voltages share the same PCB footprint.
Availability
LMR36503MSCQRPERQ1 is available at Aetrix Electronics and suitable for advanced driver assistance systems (ADAS), body electronics and lighting, and infotainment and cluster applications requiring stable component supply across automotive production lifecycles.
Supply support for LMR36503MSCQRPERQ1 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 headquartered in Dallas, Texas, designing analog and embedded processing chips for industrial, automotive, and consumer markets since 1930.
The LMR36503MSCQRPERQ1 belongs to TI's automotive-grade LMR365xx-Q1 family - engineered specifically for space-constrained, EMI-sensitive automotive power rails where size, light-load efficiency, and transient robustness are critical.
FAQ
What is the input voltage range supported by the LMR36503MSCQRPERQ1?
The LMR36503MSCQRPERQ1 supports an input voltage range from 3.0 V (falling threshold) to 65 V, with 70 V absolute maximum rating. It remains functional during severe automotive cold-crank events down to 3.0 V and withstands ISO 7637-2 load-dump transients up to 70 V - making it suitable for direct battery connection in 12 V and 24 V vehicle architectures.
Does the LMR36503MSCQRPERQ1 require external compensation components?
No, the LMR36503MSCQRPERQ1 uses peak current mode control with internal compensation. This eliminates the need for external Type II or Type III compensation networks, reducing BOM count and PCB area - a key advantage over traditional buck controllers requiring complex loop tuning.
How does the MODE/SYNC pin function on the LMR36503MSCQRPERQ1?
The MODE/SYNC pin on the LMR36503MSCQRPERQ1 enables dual functionality: it selects between PFM (light-load) and FPWM (full-load) modes, and accepts an external clock signal (200 kHz–2.2 MHz) for synchronization - suppressing beat frequencies in multi-rail systems and improving EMI predictability in clustered power domains.
What is the purpose of the PGOOD pin on the LMR36503MSCQRPERQ1?
The PGOOD pin on the LMR36503MSCQRPERQ1 is an open-drain flag that asserts high when the output voltage is within ±2.5% of its target (e.g., 3.3 V or 5 V). With a typical 1.956 ms activation delay, it replaces external reset supervisors in automotive MCUs and SoCs - simplifying power sequencing and reducing system-level component count.
Is the LMR36503MSCQRPERQ1 qualified for automotive use?
Yes, the LMR36503MSCQRPERQ1 is AEC-Q100 Grade 1 qualified (–40 °C to +125 °C ambient), with junction temperature rated to +150 °C. It includes functional safety documentation support, spread spectrum EMI reduction, and thermal shutdown - meeting stringent reliability, safety, and EMC requirements for automotive ADAS, infotainment, and body electronics.
LMR36503MSCQRPERQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 9-PowerVFQFN
- 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):
- 3V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 65V
- Current - Output:
- 300mA
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 9-VQFN-HR (2x2)
LMR36503MSCQRPERQ1 FAQ
1.How can I place an order for LMR36503MSCQRPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36503MSCQRPERQ1 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 LMR36503MSCQRPERQ1 reliable?
The price and inventory of LMR36503MSCQRPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36503MSCQRPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR36503MSCQRPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36503MSCQRPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36503MSCQRPERQ1?
LMR36503MSCQRPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36503MSCQRPERQ1 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 LMR36503MSCQRPERQ1?
For technical support, including LMR36503MSCQRPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36503MSCQRPERQ1 requirements.
6.How does Aetrix verify that LMR36503MSCQRPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR36503MSCQRPERQ1 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 LMR36503MSCQRPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR36503MSCQRPERQ1?
All LMR36503MSCQRPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR36503MSCQRPERQ1, 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 LMR36503MSCQRPERQ1 part is unused and in its original packaging.
Return procedure for LMR36503MSCQRPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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