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Texas Instruments LM73605QRNPRQ1
- Part No.:
- LM73605QRNPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM73605QRNPRQ1.pdf
- Description:
- IC REG BUCK ADJ 5A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,623
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Product details
Overview
LM73605QRNPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 5 A output current from a 3.5 V to 36 V input, featuring 53 mΩ high-side and 31 mΩ low-side MOSFETs, 60 ns minimum on-time, and adjustable 350 kHz–2.2 MHz switching frequency. It targets front-end power conversion in ADAS camera modules and infotainment head units.
For engineers reviewing the LM73605QRNPRQ1 datasheet, LM73605QRNPRQ1 pinout, LM73605QRNPRQ1 application, or LM73605QRNPRQ1 equivalent, key selection criteria include its wettable-flank WQFN-30 package for automated optical inspection, precision enable with UVLO threshold of 1.14 V, PGOOD flag with 90% undervoltage threshold, and pin-selectable auto/FPWM mode for battery-aware efficiency optimization.
Technical Context
The LM73605QRNPRQ1 employs peak current-mode control with internal compensation, enabling stable regulation across wide VIN/VOUT ratios without external loop components. Its integrated high- and low-side MOSFETs support both continuous conduction mode (CCM) and diode-emulation mode (DEM) in auto mode, with cycle-by-cycle current limiting based on sensed HS/LS currents.
It features programmable soft-start via SS/TRK pin (2 µA charge current), synchronization capability via SYNC/MODE pin (compatible with 350 kHz–2.2 MHz external clocks), and thermal shutdown at 160°C with 25°C hysteresis. The device supports pre-biased start-up and output voltage tracking through the same pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports full automotive battery range including cold-crank (4.5 V) and load-dump (36 V) transients. |
| Output Current | 5 A continuous - sufficient for powering SoCs, image sensors, and CAN transceivers in automotive ECUs. |
| Switching Frequency | 350 kHz to 2.2 MHz - selectable via RT resistor or external clock; enables optimization for EMI (lower fSW) or compact size (higher fSW). |
| MOSFET RDS(on) | HS: 53 mΩ, LS: 31 mΩ - reduces conduction loss at 5 A, improving full-load efficiency and thermal margin. |
| Quiescent Current | 15 µA in active no-load mode - extends battery runtime in always-on vehicle subsystems like telematics. |
| Min. On/Off Time | tON-MIN = 60 ns, tOFF-MIN = 70 ns - enables high step-down ratios (e.g., 24 V → 3.3 V at 500 kHz) without pulse-skipping instability. |
| PGOOD Threshold | Undervoltage: 90% of FB reference; Overvoltage: 110% - provides precise ±10% output monitoring for safety-critical rail validation. |
| Enable Threshold | VEN_H = 1.14 V, VEN_L = 1.196 V - allows accurate input UVLO setting using external resistor divider for system-level brownout protection. |
Pinout & Package
LM73605QRNPRQ1 is housed in a 30-pin Wettable Flanks QFN (WQFN) package measuring 6.00 mm × 4.00 mm × 0.8 mm, with exposed thermal pad (DAP) soldered to PCB ground for enhanced thermal dissipation (RθJB = 7.3°C/W). The wettable flanks enable reliable automated optical inspection (AOI) of solder joints in automotive production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–5, 22, 26, SW | Switch node | Internally connects HS drain and LS source; requires low-inductance connection to power inductor and CBOOT. |
| 6, CBOOT | Bootstrap capacitor terminal | Connects 470 nF ceramic cap to SW; supplies gate drive for HS FET during high-side conduction. |
| 7, VCC | Internal bias LDO output | Provides 3.27 V supply to control circuitry; requires 2.2 µF bypass cap to AGND; not for external loading. |
| 8, BIAS | Optional auxiliary LDO input | Improves light-load efficiency when tied to VOUT (3.3–18 V) or external 3.3/5 V rail; must not exceed VIN. |
| 9, RT | Frequency set input | Resistor-to-ground sets fSW; open = 500 kHz default; supports 350 kHz–2.2 MHz tuning for EMI/solution-size trade-offs. |
| 10, SS/TRK | Soft-start & tracking input | 2 µA internal current charges external cap for adjustable ramp; also accepts external voltage for output tracking. |
| 11, FB | Feedback input | Monitors resistive divider output; 1.006 V typical reference enables precise VOUT programming (e.g., 1.2 V, 3.3 V, 5 V). |
| 12–15, 27–30, NC | No-connect | Internally unconnected; tie to ground plane to improve thermal conduction and mechanical reliability. |
| 16, PGOOD | Open-drain power-good flag | Asserts high when VOUT is within ±10%; requires pull-up resistor; signals MCU when rail is stable. |
| 17, SYNC/MODE | Mode selection & sync input | Tie to GND = auto mode (PFM/CCM); logic high = forced PWM; external clock = synchronized FPWM operation. |
| 18, EN | Enable input | Logic-high active; precision threshold (1.14 V) enables programmable input UVLO; supports sequencing with other rails. |
| 19, AGND | Analog ground reference | Ground return for FB, RT, SS/TRK, EN; must be star-connected to PGND near DAP to minimize noise coupling. |
| 20–21, PVIN | Main power input | Supplies HS FET and internal LDO; requires low-ESR CIN placed adjacent to pins with short, wide traces. |
| 23–25, PGND | Power ground | Source of LS FET; connect directly to DAP, AGND, CIN, and COUT ground planes with minimal trace length. |
| EP, DAP | Exposed thermal pad | Low-impedance path to AGND; must be soldered to large copper area with thermal vias for junction temp control. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation - meets automotive power supply requirements for engine bay and cabin modules. |
| Wettable flanks WQFN-30 package | Enables AOI-compatible solder joint inspection - critical for zero-defect manufacturing in safety-relevant automotive electronics. |
| Pin-selectable auto/FPWM mode | Auto mode delivers ultra-low IQ (15 µA) at light loads; FPWM ensures constant fSW for EMI-sensitive systems like radar or audio. |
| Integrated current-limit protection | HS current limit = 7.3 A typ, LS = 5.5 A typ - provides robust short-circuit response with hiccup recovery (46 ms delay) to prevent thermal runaway. |
| Pre-biased start-up & tracking | Starts safely into pre-charged output; SS/TRK pin supports voltage sequencing with master rails - essential for multi-rail SoC power domains. |
| Low EMI design architecture | Controlled slew-rate drivers, optimized pinout, and integrated MOSFETs reduce high-frequency ringing - simplifies compliance with CISPR 25 Class 5. |
Applications
| ADAS Camera Module Power | Infotainment Head Unit Core Rail |
|---|---|
|
Use Scenario: Powers 3.3-V image sensor, ISP, and MIPI interface in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Primary buck regulator converting 12-V battery to clean, low-noise 3.3-V rail with fast transient response. Use Value: 5-A capability handles peak sensor burst currents; 60-ns tON-MIN enables stable 12 V → 3.3 V conversion at 2.2 MHz for compact filter design. |
Use Scenario: Supplies 1.2-V core voltage to ARM-based application processor in automotive infotainment systems. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with precision enable and PGOOD for safe processor boot sequencing. Use Value: Auto mode achieves <15 µA IQ during standby; PGOOD confirms rail stability before releasing processor reset. |
| Telematics Control Unit (TCU) | Body Control Module (BCM) Subsystem |
|
Use Scenario: Generates 5-V USB power and 3.3-V MCU rail in cellular-connected TCU operating continuously on vehicle battery. IC Role / Device Role / Timing Role: Dual-output capable (with external feedback resistors) buck converter supporting always-on functionality. Use Value: 0.8 µA shutdown current minimizes parasitic drain; BIAS pin improves light-load efficiency when tied to 5-V output. |
Use Scenario: Provides regulated 5-V supply for LIN transceivers, EEPROM, and LED drivers in door module or lighting ECU. IC Role / Device Role / Timing Role: Robust front-end regulator handling load-dump (36 V) and cold-crank (4.5 V) conditions per ISO 7637-2. Use Value: 36-V max input and thermal shutdown (160°C) ensure reliability in under-hood environments with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM73606QRNPRQ1 | Same pinout and package; rated for 6 A output current; higher HS/LS RDS(on) (53/31 mΩ vs. 48/27 mΩ in LM73606-Q1). | Preferred where future-proofing for higher load or margin is required; identical layout compatibility enables easy current scaling. | Select LM73606QRNPRQ1 if peak load exceeds 5 A or if thermal headroom is constrained in high-ambient environments. |
| TPS54560QDGQRQ1 | Non-synchronous buck; 60-V max input; 5-A output; external diode required; higher dropout and lower efficiency at 5 A. | Suitable for cost-sensitive, non-EMI-critical applications where board space is less constrained and efficiency >90% is not mandatory. | Choose TPS54560QDGQRQ1 only when input voltage may exceed 36 V (e.g., commercial truck 24-V systems with 60-V transients). |
Compared with LM73606QRNPRQ1, the LM73605QRNPRQ1 offers tighter current rating alignment for 5-A designs and slightly better light-load efficiency due to optimized gate drive; versus TPS54560QDGQRQ1, it delivers superior thermal performance, integrated FETs, and automotive-grade EMI behavior - making it the preferred choice for space-constrained, high-reliability automotive buck applications.
Availability
LM73605QRNPRQ1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment head units, and telematics control units requiring stable component supply with AEC-Q100 compliance and full production traceability.
Supply support for LM73605QRNPRQ1 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 ICs, with decades of experience in power management innovation and functional safety certification.
The LM7360x-Q1 product line was designed specifically for automotive distributed power architectures, emphasizing AEC-Q100 reliability, low EMI, and seamless integration into ASIL-B/C system designs.
FAQ
What is the maximum input voltage rating for LM73605QRNPRQ1?
The LM73605QRNPRQ1 has an absolute maximum input voltage rating of 42 V on the PVIN pin, but its recommended operating input voltage range is 3.5 V to 36 V. This 36-V upper limit ensures reliable operation during automotive load-dump events per ISO 7637-2, while maintaining specified electrical performance and thermal safety margins across the full AEC-Q100 Grade 1 temperature range.
Does LM73605QRNPRQ1 support pre-biased output start-up?
Yes, the LM73605QRNPRQ1 supports start-up into a pre-biased output. Its control architecture prevents reverse current flow during initial switching, allowing safe activation even when the output capacitor is already charged to the target voltage. This feature is essential for hot-swap scenarios and power rail sequencing in multi-supply automotive systems where the LM73605QRNPRQ1 may be enabled after other regulators.
How is the switching frequency configured on LM73605QRNPRQ1?
The switching frequency of LM73605QRNPRQ1 is configured either by connecting a resistor from the RT pin to ground (350 kHz to 2.2 MHz range) or by applying an external clock signal to the SYNC/MODE pin. With RT open, the default frequency is 500 kHz. The device maintains tight frequency accuracy (±10%) across temperature and input voltage, enabling predictable EMI filtering and consistent thermal performance in the LM73605QRNPRQ1 design.
What thermal management features does LM73605QRNPRQ1 include?
The LM73605QRNPRQ1 incorporates thermal shutdown at 160°C with automatic recovery at 135°C, plus junction-to-board thermal resistance of 7.3°C/W when properly mounted on a 4-layer PCB with thermal vias under the DAP. Its wettable-flank WQFN-30 package enhances solder joint reliability and heat spreading, while internal current limiting and frequency foldback reduce power dissipation during overload conditions - all critical for sustained operation in automotive under-hood environments.
Is LM73605QRNPRQ1 pin-compatible with any other devices in its family?
Yes, the LM73605QRNPRQ1 is pin-to-pin compatible with the LM73606QRNPRQ1, differing only in output current rating (5 A vs. 6 A) and minor MOSFET RDS(on) values. This compatibility allows direct replacement or scalable design reuse - for example, using LM73605QRNPRQ1 in initial prototypes and upgrading to LM73606QRNPRQ1 for production variants requiring higher current headroom, without PCB layout changes.
LM73605QRNPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 30-WFQFN 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):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 34.2V
- Current - Output:
- 5A
- Frequency - Switching:
- 350kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 30-WQFN (6x4)
LM73605QRNPRQ1 FAQ
1.How can I place an order for LM73605QRNPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM73605QRNPRQ1 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 LM73605QRNPRQ1 reliable?
The price and inventory of LM73605QRNPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM73605QRNPRQ1 is usually 5 days.
3.What payment methods are accepted for LM73605QRNPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM73605QRNPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM73605QRNPRQ1?
LM73605QRNPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM73605QRNPRQ1 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 LM73605QRNPRQ1?
For technical support, including LM73605QRNPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM73605QRNPRQ1 requirements.
6.How does Aetrix verify that LM73605QRNPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM73605QRNPRQ1 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 LM73605QRNPRQ1 meets industry standards.
7.What is the process for return or replacement of LM73605QRNPRQ1?
All LM73605QRNPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM73605QRNPRQ1, 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 LM73605QRNPRQ1 part is unused and in its original packaging.
Return procedure for LM73605QRNPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM73605QRNPRQ1 Tags
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