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Texas Instruments LM73606QRNPRQ1
- Part No.:
- LM73606QRNPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM73606QRNPRQ1.pdf
- Description:
- IC REG BUCK ADJ 6A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,791
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Product details
Overview
LM73606QRNPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous step-down DC/DC converter delivering up to 6 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 supports pre-biased start-up and operates in automotive body control modules.
For engineers reviewing the LM73606QRNPRQ1 datasheet, LM73606QRNPRQ1 pinout, LM73606QRNPRQ1 application, or LM73606QRNPRQ1 equivalent, key selection considerations include its wettable-flank WQFN-30 package, auto/FPWM mode selection via SYNC/MODE pin, precision enable threshold (1.14–1.25 V), power-good flag with 90% UVLO/110% OV thresholds, and thermal shutdown at 160°C.
Technical Context
The LM73606QRNPRQ1 employs fixed-frequency peak current-mode control with internal compensation and supports both auto mode (diode emulation at light load) and forced PWM mode (constant frequency across load). Its architecture integrates high- and low-side MOSFETs with cycle-by-cycle current limiting, hiccup short-circuit protection, and thermal shutdown.
It features pin-selectable operation modes via SYNC/MODE, programmable soft-start via SS/TRK, external synchronization capability, and tracking functionality. The device uses a bootstrap gate drive for the high-side FET and includes an internal bias LDO (VCC) plus optional external BIAS input for efficiency optimization at 3.3–18 V output voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide automotive battery transients including cold-crank (≥3.5 V) and load-dump (≤36 V) |
| Output Current | 6 A continuous - enables single-chip supply for ADAS camera modules or domain controllers |
| Switching Frequency | 350 kHz to 2.2 MHz - selectable via RT resistor or external clock; higher frequencies reduce inductor size |
| Quiescent Current | 15 µA in active no-load mode - extends battery life in always-on automotive subsystems |
| Min On/Off Time | tON-MIN = 60 ns, tOFF-MIN = 70 ns - enables high VIN/VOUT ratios (e.g., 24 V → 3.3 V) without pulse-skipping instability |
| MOSFET RDS(on) | HS = 53 mΩ, LS = 31 mΩ - reduces conduction loss and thermal stress at full 6-A load |
| Thermal Shutdown | 160°C shutdown / 135°C recovery - protects against sustained overload or poor heatsinking |
Pinout & Package
LM73606QRNPRQ1 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 optimal heat dissipation. The package supports automated optical inspection (AOI) of solder joints via wettable flanks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1–5, 22, 26) | Switch node | Connects to inductor and CBOOT; carries high di/dt switching current; requires tight layout to minimize EMI |
| CBOOT (Pin 6) | Bootstrap capacitor connection | Supplies gate drive voltage for high-side MOSFET; requires 470-nF ceramic capacitor to SW |
| VCC (Pin 7) | Internal bias supply output | Powers internal control circuitry; requires 2.2-µF bypass capacitor to AGND; not for external loading |
| BIAS (Pin 8) | Optional external bias 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; open defaults to ~500 kHz; enables precise EMI band placement |
| SS/TRK (Pin 10) | Soft-start & tracking control | 2-µA current source charges external capacitor for adjustable ramp; also accepts external voltage for sequencing |
| FB (Pin 11) | Feedback input | Monitors output via resistor divider; reference voltage = 1.006 V typical; determines regulation accuracy |
| PGOOD (Pin 16) | Power-good flag | Open-drain output asserts high when VOUT within ±10% of target; requires pull-up for system monitoring |
| SYNC/MODE (Pin 17) | Mode selection & sync input | Ground = auto mode; logic high = FPWM; external clock = synchronized FPWM - defines light-load behavior |
| EN (Pin 18) | Enable input | Logic-high active; precision UVLO allows resistor-divider input voltage threshold tuning (1.14–1.25 V) |
| 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 bypass placed adjacent to pins and PGND |
| PGND (Pins 23–26) | Power ground | Source of LS FET; connects to DAP, AGND, CIN/COUT grounds; shortest possible trace to PVIN critical |
| DAP/EP | Exposed thermal pad | Low-impedance path to AGND; must be soldered to PCB ground plane with thermal vias for 1 °C/W junction-to-board RθJB |
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 |
| Wettable flanks WQFN package | Enables AOI-compatible solder joint inspection - improves manufacturing yield and field reliability |
| Auto mode with diode emulation | Reduces light-load quiescent current to 15 µA and eliminates reverse inductor current - maximizes battery runtime |
| Adjustable soft-start & tracking | Prevents inrush current and enables power-rail sequencing with external voltage sources - critical for multi-rail systems |
| Integrated cycle-by-cycle current limit | HS limit = 7.4–9.85 A, LS limit = 5.8–7.25 A - provides robust short-circuit protection without external sensing |
| Power-good flag with hysteresis | UVLO = 90% VFB, OV = 110% VFB, hysteresis = 1.2% - ensures clean system reset and fault detection |
Applications
| ADAS Camera Power Supply | Automotive Infotainment SoC Core Rail |
|---|---|
Use Scenario: Powers 3.3-V image sensor and ISP in forward-facing ADAS camera module operating from 9–16-V vehicle battery. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 3.3 V at up to 6 A with pre-biased start-up support during hot-swap events. Use Value: 53 mΩ/31 mΩ MOSFETs and 60 ns tON-MIN enable high efficiency (>92% at 3 A) and stable regulation during cold-crank (6.5 V input). | Use Scenario: Supplies core voltage (0.8–1.2 V) to automotive-grade application processor in head-unit, requiring tight transient response and sequencing with DDR memory rails. IC Role / Device Role / Timing Role: Intermediate bus converter generating 1.0 V from 5-V rail, with tracking enabled via SS/TRK pin for controlled power-up ramp. Use Value: Adjustable soft-start and output voltage tracking ensure monotonic startup and prevent latch-up in multi-rail SoC domains. |
| Body Control Module (BCM) Subsystem | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: Powers microcontroller, CAN transceiver, and LIN interface in centralized BCM handling door locks, lighting, and HVAC controls. IC Role / Device Role / Timing Role: Main 5-V or 3.3-V supply with precision enable (1.14–1.25 V threshold) enabling controlled wake-up from ultra-low-power sleep states. Use Value: 0.8 µA shutdown current and auto mode extend battery life during extended vehicle-off periods while maintaining fast wake-up capability. | Use Scenario: Supplies isolated 5-V and 3.3-V rails to torque and position sensors in EPS system, subject to high EMI and thermal stress near motor. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with thermal shutdown (160°C) and hiccup-mode short-circuit protection for safety-critical sensor interfaces. Use Value: Wettable-flank WQFN package and integrated current limiting eliminate need for external fault management circuitry - simplifies ASIL-B compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM73605QRNPRQ1 | 5-A rated; identical pinout and package; lower RDS(on) not specified in datasheet but typically 58 mΩ HS / 34 mΩ LS | Lower max output current limits use in 5-A subsystems only; same thermal design applies | Select when 5-A capability suffices and cost optimization is prioritized over 6-A headroom |
| TPS546B24RVFT | 6-A, 4.5–18-V input; PMBus-enabled; 3.5-mm × 3.5-mm VQFN; no wettable flanks; higher IQ (25 µA) | Requires digital configuration; suited for programmable power systems with telemetry needs | Choose when dynamic margining, telemetry, or tighter output voltage tolerance (±0.5%) is required |
Compared with LM73605QRNPRQ1, the LM73606QRNPRQ1 offers 20% higher current capacity and slightly lower MOSFET resistance, while TPS546B24RVFT adds digital control at the expense of analog simplicity and automotive AOI compatibility.
Availability
LM73606QRNPRQ1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, body control units, and electric power steering sensor interfaces requiring stable component supply under AEC-Q100 conditions.
Supply support for LM73606QRNPRQ1 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 specializing in analog and embedded processing technologies, with leadership in automotive power management ICs and broad portfolio of AEC-Q100 qualified devices.
The LM7360x-Q1 product line delivers highly integrated synchronous buck converters optimized for automotive distributed power architectures, emphasizing low EMI, wettable-flank packaging, and robust protection for safety-critical subsystems.
FAQ
What is the maximum input voltage rating for LM73606QRNPRQ1?
The LM73606QRNPRQ1 has an absolute maximum input voltage rating of 42 V on the PVIN pin, with recommended operating range from 3.5 V to 36 V. This allows reliable operation during automotive load-dump transients up to 36 V while maintaining functional safety margins per AEC-Q100 requirements.
Does LM73606QRNPRQ1 support pre-biased start-up?
Yes, LM73606QRNPRQ1 supports start-up into a pre-biased output. This feature prevents reverse current flow during hot-insertion scenarios common in automotive domain controllers and ensures stable regulation even when VOUT is initially non-zero before EN assertion.
How is switching frequency set on LM73606QRNPRQ1?
Switching frequency on LM73606QRNPRQ1 is set using an external resistor from the RT pin to AGND. With RT open, default frequency is ~500 kHz; values from 17.4 kΩ (2.2 MHz) to 115 kΩ (350 kHz) adjust frequency linearly. Alternatively, an external clock applied to SYNC/MODE pin synchronizes operation within the same range.
What thermal performance can be expected from LM73606QRNPRQ1 in a standard 4-layer PCB?
In a standard 4-layer PCB with 2-oz copper, thermal vias under the DAP, and 1-in² ground pour, LM73606QRNPRQ1 achieves a junction-to-board thermal resistance (RθJB) of 7.3 °C/W. At 6-A load and 12-V input, this yields ~35°C temperature rise above board temperature, well below the 160°C shutdown threshold.
Is LM73606QRNPRQ1 pin-compatible with any other TI buck regulators?
Yes, LM73606QRNPRQ1 is pin-to-pin compatible with LM73605QRNPRQ1, differing only in current rating (6 A vs. 5 A) and minor MOSFET RDS(on) values. This enables scalable design reuse across platforms - e.g., upgrading from LM73605QRNPRQ1 to LM73606QRNPRQ1 for higher-current variants without layout changes.
LM73606QRNPRQ1 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:
- 6A
- 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)
LM73606QRNPRQ1 FAQ
1.How can I place an order for LM73606QRNPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM73606QRNPRQ1 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 LM73606QRNPRQ1 reliable?
The price and inventory of LM73606QRNPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM73606QRNPRQ1 is usually 5 days.
3.What payment methods are accepted for LM73606QRNPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM73606QRNPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM73606QRNPRQ1?
LM73606QRNPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM73606QRNPRQ1 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 LM73606QRNPRQ1?
For technical support, including LM73606QRNPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM73606QRNPRQ1 requirements.
6.How does Aetrix verify that LM73606QRNPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM73606QRNPRQ1 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 LM73606QRNPRQ1 meets industry standards.
7.What is the process for return or replacement of LM73606QRNPRQ1?
All LM73606QRNPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM73606QRNPRQ1, 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 LM73606QRNPRQ1 part is unused and in its original packaging.
Return procedure for LM73606QRNPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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