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Texas Instruments LM73605QRNPTQ1
- Part No.:
- LM73605QRNPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM73605QRNPTQ1.pdf
- Description:
- IC REG BUCK ADJ 5A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:684
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Product details
Overview
LM73605QRNPTQ1 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 wettable-flank WQFN-30 (6 mm × 4 mm) packaging for automated optical inspection in automotive power rails.
For engineers reviewing the LM73605QRNPTQ1 datasheet, LM73605QRNPTQ1 pinout, LM73605QRNPTQ1 application, or LM73605QRNPTQ1 equivalent, key selection criteria include its 350 kHz–2.2 MHz adjustable switching frequency, auto/FPWM mode selection via SYNC/MODE pin, precision enable with UVLO hysteresis, PGOOD flag with 10% OV/UV thresholds, and thermal shutdown at 160°C - all validated for under-hood automotive environments.
Technical Context
The LM73605QRNPTQ1 implements fixed-frequency peak current-mode control with internal compensation, enabling stable regulation across wide VIN/VOUT ratios. Its dual-mode operation-auto mode (diode emulation at light loads) and forced PWM (constant frequency across load)-is selected via the SYNC/MODE pin, supporting both high-efficiency battery operation and EMI-sensitive systems.
It integrates high- and low-side MOSFETs with confirmed RDS_ON_HS = 53 mΩ (typ) and RDS_ON_LS = 31 mΩ (typ), supports pre-biased start-up and output voltage tracking via SS/TRK, and features cycle-by-cycle current limiting with hiccup recovery (128 cycles, 46 ms retry delay) and precision feedback reference (1.006 V ±11 mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports 12 V and 24 V automotive batteries with 42 V transient tolerance. |
| Output Current | Up to 5 A - sufficient for ADAS camera modules, infotainment SoCs, and body control units. |
| Switching Frequency | 350 kHz to 2.2 MHz - adjustable via RT resistor or external clock; enables compact magnetics or low-noise layout. |
| Quiescent Current | 15 µA (active, no load) - extends battery life in always-on vehicle subsystems. |
| Feedback Reference | 1.006 V ±11 mV - enables accurate output regulation across temperature (−40°C to +125°C). |
| Thermal Shutdown | 160°C shutdown / 135°C recovery - protects against sustained overload or poor heatsinking in sealed enclosures. |
| ESD Rating | HBM ±2 kV, CDM ±750 V - meets AEC-Q100 stress requirements for automotive assembly and field operation. |
Pinout & Package
The LM73605QRNPTQ1 uses 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 optimal thermal performance (RθJB = 7.3°C/W). Wettable flanks enable AOI-compatible solder joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1–5, 22, 26) | Power switch node | Connects to inductor and CBOOT; carries full switching current; requires tight layout to minimize ringing and EMI. |
| CBOOT (Pin 6) | Bootstrap capacitor connection | Supplies gate drive for high-side MOSFET; requires 470 nF ceramic capacitor directly to SW pin. |
| VCC (Pin 7) | Internal bias LDO output | Powers internal control circuitry; requires 2.2 µF ceramic capacitor to AGND; not for external loading. |
| BIAS (Pin 8) | Optional external bias supply input | Improves efficiency when tied to VOUT (3.3–18 V) or external rail; must not exceed VIN. |
| RT (Pin 9) | Frequency setting input | Resistor-to-ground sets fSW from 350 kHz to 2.2 MHz; floating defaults to ~500 kHz. |
| SS/TRK (Pin 10) | Soft-start and tracking control | 2 µA current source charges external capacitor for programmable ramp; supports voltage sequencing with external ramp. |
| FB (Pin 11) | Feedback input | Monitors output via resistor divider; 1.006 V reference enables precise VOUT adjustment (e.g., 3.3 V, 5 V, 12 V). |
| PGOOD (Pin 16) | Open-drain power-good flag | Signals regulation status (high = OK); requires pull-up; asserts low during UV/OV/fault or EN = low. |
| SYNC/MODE (Pin 17) | Mode selection and sync input | GND = auto mode (PFM at light load); logic high = FPWM; external clock = synchronized FPWM. |
| EN (Pin 18) | Enable input | Logic-controlled ON/OFF; precision UVLO threshold (1.14–1.25 V rising) allows custom input voltage turn-on. |
| AGND (Pin 19) | Analog ground reference | Reference for FB, RT, SS/TRK; must be connected to system ground with low-impedance path. |
| PVIN (Pins 20–22) | Main power input | Supplies HS FET and internal LDO; requires local CIN placement with short, wide traces to PGND. |
| PGND (Pins 23–26) | Power ground | Source of LS FET; connects to DAP, AGND, CIN/COUT grounds; critical for thermal and EMI performance. |
| DAP (EP) | Exposed thermal pad | Low-impedance path to AGND; must be soldered to PCB ground plane with thermal vias for heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation - suitable for engine bay and transmission control units. |
| Wettable flanks WQFN-30 | Enables automated optical inspection of solder joints - improves manufacturing yield and field reliability in automotive production. |
| Adjustable frequency & external sync | 350 kHz–2.2 MHz tuning range plus synchronization capability - reduces EMI by avoiding sensitive frequency bands. |
| Pre-biased start-up and tracking | Supports hot-plug and multi-rail sequencing - essential for complex automotive ECUs with staggered power-up requirements. |
| Integrated high- and low-side MOSFETs | 53 mΩ HS / 31 mΩ LS RDS_ON - eliminates external diode losses and simplifies BOM for compact, high-efficiency 5 A solutions. |
| Internal compensation | Reduces external component count to only inductor, input/output capacitors, and feedback resistors - accelerates design and validation. |
Applications
| ADAS Camera Power Supply | Automotive Infotainment SoC Rail |
|---|---|
Use Scenario: Powers 3.3 V or 5 V imaging sensor and ISP in forward-facing driver assistance cameras exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated, low-noise, high-reliability power with PGOOD monitoring and thermal protection. Use Value: Delivers 5 A continuous current with 15 µA quiescent current to extend sleep-mode battery life while maintaining AEC-Q100 compliance. | Use Scenario: Supplies core voltage (e.g., 1.1 V @ 4 A) and I/O rail (3.3 V @ 2 A) for multimedia SoCs in head units and digital clusters. IC Role / Device Role / Timing Role: Synchronous step-down converter with tracking and soft-start for coordinated multi-rail power sequencing. Use Value: Enables precise voltage ramp control and pre-biased start-up to prevent latch-up during hot insertion or reset events. |
| Body Control Module (BCM) Core Rail | Electric Power Steering (EPS) Auxiliary Supply |
Use Scenario: Generates 5 V or 3.3 V for microcontroller, CAN transceivers, and sensor interfaces in centralized body electronics. IC Role / Device Role / Timing Role: Main DC/DC converter with precision enable and UVLO hysteresis for controlled wake-up from low-power states. Use Value: Supports cold-cranking down to 3.5 V input and handles 42 V load-dump transients without latch-up or shutdown. | Use Scenario: Provides isolated auxiliary 12 V or 5 V rail for EPS motor drivers, position sensors, and safety monitoring circuits. IC Role / Device Role / Timing Role: High-reliability buck converter with hiccup-mode short-circuit protection and thermal shutdown. Use Value: Ensures fail-safe operation under fault conditions with 128-cycle hiccup detection and 46 ms retry delay to prevent thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM73606QRNPTQ1 | 6 A output rating; identical pinout, package, and feature set; higher RDS_ON_HS (53 mΩ → 45 mΩ typ) and RDS_ON_LS (31 mΩ → 26 mΩ typ). | Used where >5 A peak load current is required (e.g., high-power radar modules); same PCB layout but higher current capability. | Select LM73606QRNPTQ1 when peak load exceeds 5 A; otherwise LM73605QRNPTQ1 offers optimal cost/performance balance for ≤5 A systems. |
| TPS54560QDGQRQ1 | 5 A, 3.5–60 V input; external MOSFETs; no integrated power stage; higher BOM count; 100 ns tON-MIN vs. 60 ns. | Suitable for ultra-wide VIN (>36 V) or high-temp derating scenarios where discrete FETs allow custom thermal management. | Choose TPS54560QDGQRQ1 only if input exceeds 36 V or discrete FET control is mandatory; LM73605QRNPTQ1 provides superior integration and EMI performance for standard 12/24 V automotive rails. |
Compared with LM73606QRNPTQ1, the LM73605QRNPTQ1 trades 1 A output capacity for tighter thermal margin and lower gate charge in the same footprint; versus TPS54560QDGQRQ1, it delivers lower solution size, reduced layout complexity, and better light-load efficiency due to integrated FETs and auto-mode operation.
Availability
LM73605QRNPTQ1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power rails, and body control module core supplies requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM73605QRNPTQ1 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 high-reliability power management solutions.
The LM7360x-Q1 product line was designed specifically for automotive distributed power architectures, emphasizing AEC-Q100 qualification, wettable-flank packaging for process control, and integrated high-efficiency conversion in minimal board area.
FAQ
What is the maximum input voltage rating for the LM73605QRNPTQ1?
The LM73605QRNPTQ1 has an absolute maximum PVIN-to-PGND rating of 42 V, with recommended operating input range from 3.5 V to 36 V. This allows robust operation during automotive load-dump transients while maintaining regulation across cold-crank (down to 3.5 V) and nominal 12 V/24 V battery conditions. The device remains functional and protected within these limits per its AEC-Q100 qualification.
Does the LM73605QRNPTQ1 support output voltage tracking?
Yes, the LM73605QRNPTQ1 supports output voltage tracking via the SS/TRK pin. When an external ramp signal is applied to this pin, the device synchronizes its soft-start ramp to match another power rail's rise time - enabling precise sequencing in multi-voltage systems like automotive infotainment SoCs. Tracking is implemented without additional external components beyond the ramp source.
How does the auto mode versus forced PWM mode affect efficiency in the LM73605QRNPTQ1?
In auto mode, the LM73605QRNPTQ1 enters diode emulation (PFM) at light loads, reducing switching frequency to minimize losses - achieving 15 µA quiescent current and >90% efficiency at 10 mA output. In forced PWM mode, it maintains constant frequency regardless of load, sacrificing light-load efficiency for predictable EMI and ripple behavior. Selection is made via the SYNC/MODE pin.
What thermal performance can be expected from the LM73605QRNPTQ1 in a typical 4-layer PCB layout?
With proper layout - including full DAP soldering to inner ground planes and ≥6 thermal vias - the LM73605QRNPTQ1 achieves RθJB = 7.3°C/W. At 5 A output into 5 V, typical power dissipation is ~0.5 W, resulting in ~12°C junction-to-board temperature rise above ambient. This enables reliable operation up to +125°C ambient without forced airflow, meeting AEC-Q100 Grade 1 requirements.
Is the LM73605QRNPTQ1 pin-compatible with any other devices in the same family?
Yes, the LM73605QRNPTQ1 is pin-to-pin compatible with the LM73606QRNPTQ1, differing only in output current rating (5 A vs. 6 A) and minor MOSFET RDS_ON values. Both share identical WQFN-30 packaging, pin functions, thermal pad layout, and feature set - enabling scalable current design with no PCB revision required when upgrading from LM73605QRNPTQ1 to LM73606QRNPTQ1.
LM73605QRNPTQ1 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)
LM73605QRNPTQ1 FAQ
1.How can I place an order for LM73605QRNPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM73605QRNPTQ1 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 LM73605QRNPTQ1 reliable?
The price and inventory of LM73605QRNPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM73605QRNPTQ1 is usually 5 days.
3.What payment methods are accepted for LM73605QRNPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM73605QRNPTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM73605QRNPTQ1?
LM73605QRNPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM73605QRNPTQ1 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 LM73605QRNPTQ1?
For technical support, including LM73605QRNPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM73605QRNPTQ1 requirements.
6.How does Aetrix verify that LM73605QRNPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM73605QRNPTQ1 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 LM73605QRNPTQ1 meets industry standards.
7.What is the process for return or replacement of LM73605QRNPTQ1?
All LM73605QRNPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM73605QRNPTQ1, 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 LM73605QRNPTQ1 part is unused and in its original packaging.
Return procedure for LM73605QRNPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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