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Texas Instruments LMR36503MSC5RPERQ1
- Part No.:
- LMR36503MSC5RPERQ1
- Manufacturer:
- Texas Instruments
- Package:
- 9-PowerVFQFN
- Datasheet:
-
LMR36503MSC5RPERQ1.pdf
- Description:
- IC REG BUCK 5V 300MA 9VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,252
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Product details
Overview
LMR36503MSC5RPERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade synchronous buck converter delivering 5 V fixed output at up to 0.3 A, with 3.0–65 V input range, 2.2 MHz fixed switching frequency, and 4 µA quiescent current in switching mode (VIN = 24 V → VOUT = 3.3 V). It integrates internal compensation, PGOOD flag, and spread-spectrum EMI reduction for ADAS power rails.
For engineers reviewing the LMR36503MSC5RPERQ1 datasheet, LMR36503MSC5RPERQ1 pinout, LMR36503MSC5RPERQ1 application, or LMR36503MSC5RPERQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and ESD specs, and real-world application constraints - all aligned to TI's production data sheet SNVSBB5B (Rev. B, Sep 2020).
Technical Context
The LMR36503MSC5RPERQ1 uses peak current-mode control with internal compensation and supports seamless FPWM-to-PFM transition for light-load efficiency. Its MODE/SYNC pin enables external clock synchronization and selectable PFM/FPWM operation, while pseudo-random spread spectrum reduces peak EMI emissions per CISPR 25 Class 5.
It operates across –40°C to +125°C ambient (–40°C to +150°C junction), withstands 70 V input transients, and features integrated high- and low-side MOSFETs with RDS(on) of 560–920 mΩ (HS) and 280–460 mΩ (LS). The device includes thermal shutdown (158–180°C rising), precise enable thresholds (VEN-VOUT = 1.16–1.36 V), and a 2.2 MHz fixed oscillator (RT pin unconnected, factory-trimmed).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V (falling threshold) to 65 V - sustains regulation during cold-crank sags down to 3.0 V and handles load-dump transients up to 70 V. |
| Output Voltage | Fixed 5.0 V ±1.5% (FPWM mode) - eliminates external feedback divider; initial accuracy ensures stable MCU/ASIC bias without calibration. |
| Max Output Current | 0.3 A continuous DC - rated for sustained operation with derating above 125°C junction temperature. |
| Quiescent Current | 4 µA (switching, VIN = 24 V → 3.3 V) - enables >70% efficiency at 5 mA load, critical for always-on automotive modules. |
| Switching Frequency | Fixed 2.2 MHz - avoids AM band interference; enables compact 1.0 µH inductor and small ceramic output capacitors. |
| EMI Performance | Pseudo-random spread spectrum (±2% span, ~1.2 Hz pattern) - meets CISPR 25 Class 5 without common-mode chokes or shielding. |
| Package | VQFN-HR (RPE), 2 mm × 2 mm, 9-pin, wettable flanks - supports automated optical inspection and robust solder joint reliability in automotive reflow profiles. |
Pinout & Package
VQFN-HR (RPE) package: 2.00 mm × 2.00 mm body, 9-pin, exposed thermal pad, wettable flanks. Pin 1 is trimmed and factory-set for MODE/SYNC variant (not RT); Pin 8 is factory-set for fixed 5 V output (VOUT/BIAS).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MODE/SYNC | Configurable digital interface | Selects PFM/FPWM mode or synchronizes to external clock (0.2–2.2 MHz); must not be floated. |
| 2 - PGOOD | Open-drain status flag | Signals valid output (106–110% / 93–96.5% thresholds); replaces external supervisor IC in most systems. |
| 3 - EN/UVLO | Enable & undervoltage lockout | Starts regulation when VIN ≥ 3.5 V (rising) and EN ≥ 1.16 V; shuts down below 0.4 V (wake threshold). |
| 4 - VIN | Main power input | Accepts 3–65 V; requires local high-quality bypass capacitor directly to GND for transient immunity. |
| 5 - SW | Power switch node | Connects to inductor; carries high di/dt; layout demands short, wide traces to minimize EMI and voltage spikes. |
| 6 - BOOT | Bootstrap supply | Drives high-side MOSFET gate; requires 100 nF ceramic capacitor between BOOT and SW. |
| 7 - VCC | Internal LDO output | Supplies internal logic (3.125–3.22 V); decouple with 1 µF to GND; do not load externally. |
| 8 - VOUT/BIAS | Fixed-output voltage sense | Internally connected to 5 V regulator output; used for feedback in fixed-VOUT variants (no external resistor needed). |
| 9 - GND | Power ground | Primary return path; connect to CIN with short, wide trace; tie to system ground plane under thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with full electrical test coverage per automotive stress requirements. |
| Integrated PGOOD with delay filter | 2.16 ms activation delay (tPGOOD_ACT) and 25 µs glitch rejection (tRESET_FILTER) eliminate need for external reset IC. |
| Ultra-low light-load IQ | 4 µA switching IQ enables >70% efficiency at 5 mA - extends battery life in always-on vehicle modules like door ECUs. |
| HotRod™ flip-chip packaging | No bond wires reduce parasitic inductance; wettable flanks enable AOI; corner anchor pins improve mechanical reliability under thermal cycling. |
| Internal compensation | Eliminates external Type II/III compensation network - reduces BOM count and design iteration time for 5 V fixed-output use cases. |
Applications
| ADAS Camera Power Supply | Body Control Module (BCM) Sensor Rail |
|---|---|
|
Use Scenario: Powers image sensor, ISP, and interface logic in forward-facing monocular camera operating across cold-crank (3.0 V) and load-dump (70 V) conditions. IC Role / Device Role / Timing Role: Primary 5 V buck regulator providing clean, regulated power with PGOOD sequencing for SoC boot and fault reporting. Use Value: Fixed 5 V output eliminates feedback resistor errors; 2.2 MHz switching allows <1.5 mm² solution size; spread spectrum meets CISPR 25 Class 5 without added filtering. |
Use Scenario: Supplies 5 V to LIN transceivers, door lock actuators, and ambient light sensors in centralized BCM with 12 V battery input. IC Role / Device Role / Timing Role: Always-on auxiliary regulator maintaining low IQ during sleep mode while supporting fast wake-up via EN pin. Use Value: 4 µA IQ extends vehicle-off battery life; AEC-Q100 qualification ensures 15-year field reliability; wettable-flank package passes automotive vibration testing. |
| Infotainment Display Backlight Bias | Digital Cluster Microcontroller Core Rail |
|
Use Scenario: Generates stable 5 V bias for LED driver ICs powering TFT display backlight in head-unit infotainment systems. IC Role / Device Role / Timing Role: Secondary power stage downstream of main 12 V–5 V conversion; synchronized via MODE/SYNC to avoid beat frequencies. Use Value: External clock sync (0.2–2.2 MHz) eliminates audible noise in display power; 65 V max input tolerates alternator ripple and transients. |
Use Scenario: Delivers 5 V core power to ARM Cortex-M7 microcontroller in digital instrument cluster with strict startup timing and fault reporting. IC Role / Device Role / Timing Role: Regulator with soft-start (2.58 ms tSS) and PGOOD assertion (1.96 ms tPGOOD_ACT) for deterministic boot sequence. Use Value: Precise enable thresholds (1.16–1.36 V) enable direct connection to MCU GPIO; thermal shutdown (158–180°C) protects against enclosure overheating. |
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 | Fixed 3.3 V output; identical pinout, package, and feature set except VOUT/BIAS pin factory-set to 3.3 V. | Used where 3.3 V logic rail is required instead of 5 V - no change to PCB layout or external components. | Select when target SoC or peripheral requires 3.3 V instead of 5 V; same thermal, EMI, and efficiency profile. |
| LMR36506MSC5RPERQ1 | 65 V, 0.6 A version; pin-compatible with LMR36503MSC5RPERQ1 but higher current capability and different RDS(on) (HS: 320–520 mΩ). | Suitable for higher-power loads (e.g., radar SoCs) where 0.3 A is insufficient; requires verification of thermal margin and inductor saturation. | Choose when load current exceeds 0.3 A; retains same footprint and MODE/SYNC functionality but doubles output capability. |
Compared with LMR36503MSC3RPERQ1, the LMR36503MSC5RPERQ1 provides +1.7 V higher output for 5 V peripherals without changing layout; compared with LMR36506MSC5RPERQ1, it offers lower cost and smaller thermal footprint for sub-300 mA applications, trading current headroom for optimized size and light-load efficiency.
Availability
LMR36503MSC5RPERQ1 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, AEC-Q100 compliance, and long-term automotive lifecycle support.
Supply support for LMR36503MSC5RPERQ1 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 and manufacturing analog and embedded processing chips for industrial, automotive, and consumer markets.
The LMR36503MSC5RPERQ1 belongs to TI's LMR3650x-Q1 family of automotive-grade buck converters, engineered specifically for space-constrained, low-IQ, high-EMI-immunity power rails in ADAS, body control, and infotainment systems.
FAQ
What is the maximum input voltage the LMR36503MSC5RPERQ1 can withstand?
The LMR36503MSC5RPERQ1 has an absolute maximum input voltage rating of 70 V and operates continuously from 3.0 V (falling threshold) to 65 V. It is designed to survive automotive load-dump transients and cold-crank sags without latch-up or damage, making it suitable for 12 V and 24 V battery systems with harsh voltage excursions.
Does the LMR36503MSC5RPERQ1 require external compensation components?
No, the LMR36503MSC5RPERQ1 uses internal compensation optimized for minimal output capacitance. For the fixed 5 V output variant, no external compensation network is needed - only input and output ceramic capacitors, inductor, BOOT capacitor, and optional EN pull-up resistor are required.
How does the PGOOD function work on the LMR36503MSC5RPERQ1?
The LMR36503MSC5RPERQ1 PGOOD pin is an open-drain flag that asserts high when output voltage reaches 106–110% of nominal 5 V and deasserts low when falling below 93–96.5%. With a 2.16 ms activation delay and 25 µs glitch filter, it replaces external supervisors in most automotive designs, simplifying power sequencing and fault detection.
Can the LMR36503MSC5RPERQ1 be synchronized to an external clock?
Yes - the MODE/SYNC pin on the LMR36503MSC5RPERQ1 accepts an external clock signal from 0.2 MHz to 2.2 MHz, enabling synchronization to system clocks to avoid beat frequencies and reduce EMI peaks. When not synchronized, it operates in user-selectable PFM/FPWM mode with automatic light-load efficiency optimization.
What is the thermal performance of the LMR36503MSC5RPERQ1 in a typical 4-layer PCB layout?
In a standard JEDEC 4-layer board simulation, the LMR36503MSC5RPERQ1 exhibits a junction-to-board thermal resistance (RθJB) of 26.1°C/W and junction-to-ambient (RθJA) of 84.4°C/W. With proper copper pour under the thermal pad and 2 oz. inner layers, it sustains 0.3 A continuous output at +85°C ambient without thermal shutdown.
LMR36503MSC5RPERQ1 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 65V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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)
LMR36503MSC5RPERQ1 FAQ
1.How can I place an order for LMR36503MSC5RPERQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR36503MSC5RPERQ1 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 LMR36503MSC5RPERQ1 reliable?
The price and inventory of LMR36503MSC5RPERQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR36503MSC5RPERQ1 is usually 5 days.
3.What payment methods are accepted for LMR36503MSC5RPERQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR36503MSC5RPERQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR36503MSC5RPERQ1?
LMR36503MSC5RPERQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR36503MSC5RPERQ1 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 LMR36503MSC5RPERQ1?
For technical support, including LMR36503MSC5RPERQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR36503MSC5RPERQ1 requirements.
6.How does Aetrix verify that LMR36503MSC5RPERQ1 is sourced from the original manufacturer or authorized distributors?
All LMR36503MSC5RPERQ1 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 LMR36503MSC5RPERQ1 meets industry standards.
7.What is the process for return or replacement of LMR36503MSC5RPERQ1?
All LMR36503MSC5RPERQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LMR36503MSC5RPERQ1, 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 LMR36503MSC5RPERQ1 part is unused and in its original packaging.
Return procedure for LMR36503MSC5RPERQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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