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Texas Instruments LM73606QURNPRQ1
- Part No.:
- LM73606QURNPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM73606QURNPRQ1.pdf
- Description:
- IC REG BUCK ADJ 6A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,623
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Product details
Overview
LM73606QURNPRQ1 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 infotainment power rails.
For engineers reviewing the LM73606QURNPRQ1 datasheet, LM73606QURNPRQ1 pinout, LM73606QURNPRQ1 application, or LM73606QURNPRQ1 equivalent, key selection criteria include its wettable-flank–compatible WQFN-30 package, auto/FPWM mode selectability, precision enable threshold (1.14–1.25 V), PGOOD flag with 90% UVLO hysteresis, and thermal shutdown at 160°C.
Technical Context
This device implements fixed-frequency peak current-mode control with internal compensation and dual operating modes: auto mode enables diode-emulation for light-load efficiency, while forced PWM (FPWM) ensures constant frequency across load. The integrated high- and low-side MOSFETs support continuous and discontinuous conduction modes, with cycle-by-cycle current limiting based on sensed HS/LS currents.
It features programmable soft-start via external capacitor on SS/TRK, synchronization capability to external clocks up to 2.2 MHz, and precision enable with hysteresis (±100 mV). Protection includes thermal shutdown (160°C trip, 135°C recovery), hiccup-mode short-circuit response, input UVLO, and overvoltage/undervoltage detection on the FB pin.
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 maximum - delivers full rated current without derating at TJ ≤ 125°C with proper PCB thermal design. |
| Switching Frequency | 350 kHz to 2.2 MHz - adjustable via RT resistor or external sync clock; enables optimization of size (high-freq) vs. efficiency (low-freq). |
| Quiescent Current | 15 µA typical in active no-load - critical for always-on automotive modules requiring ultra-low standby power. |
| MOSFET RDS(on) | HS: 53 mΩ, LS: 31 mΩ - reduces conduction losses, especially beneficial for low-VOUT applications like 3.3 V or 5 V rails. |
| 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. |
| Thermal Resistance | RθJB = 7.3 °C/W - low junction-to-board resistance enables effective heat transfer to PCB copper when DAP is properly soldered. |
Pinout & Package
The LM73606QURNPRQ1 uses a 30-pin WQFN package (6.00 mm × 4.00 mm × 0.8 mm) with non-wettable flanks and an exposed thermal pad (DAP) tied internally to AGND. The package supports automated optical inspection (AOI) and provides low-inductance, high-current paths for PVIN, PGND, and SW pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–5, 22, 26, SW | Power switch node | Internally connects HS drain and LS source; requires direct connection to inductor and CBOOT; carries full switching current and high di/dt. |
| 6, CBOOT | Bootstrap supply | Provides gate drive voltage for HS FET; must be decoupled to SW with 470-nF ceramic capacitor for reliable high-side turn-on. |
| 7, VCC | Internal bias rail | Supplies internal control circuitry; requires 2.2-µF ceramic capacitor to AGND; not intended for external loading. |
| 8, BIAS | Optional auxiliary LDO input | Improves efficiency when tied to VOUT (3.3–18 V) or external 3.3/5 V rail; must not exceed VIN; tie to GND if unused. |
| 9, RT | Frequency set input | Resistor-to-GND sets fSW from 350 kHz to 2.2 MHz; open-circuit defaults to ~500 kHz; floating prohibited. |
| 10, SS/TRK | Soft-start & tracking | 2-µA current source charges external cap for adjustable ramp; connect to external voltage for output tracking during sequencing. |
| 11, FB | Voltage feedback input | Monitors resistive divider output; reference voltage = 1.006 V typical; never short to ground during operation. |
| 16, PGOOD | Open-drain status flag | Asserts high when VOUT within ±5% of regulation; requires external pullup; asserts low during EN=low or UV/OV fault. |
| 17, SYNC/MODE | Mode control & sync input | Determines operation: GND = auto mode, >0.42 V = FPWM, external clock = synchronized FPWM; must not float. |
| 18, EN | Enable with UVLO | Logic-compatible input; rising threshold = 1.14–1.25 V; hysteresis = 100 mV; supports adjustable input UVLO via resistor divider. |
| 19, AGND | Analog ground reference | Ground return for FB, RT, SS/TRK, PGOOD, and internal analog circuits; separate from PGND but connected on PCB. |
| 20–22, PVIN | Main power input | Supplies HS FET and internal LDO; requires local CIN placement with short, wide traces to PGND pins to minimize loop inductance. |
| 23–26, PGND | Power ground | Source of LS FET; connects to system GND, DAP, AGND, and CIN/COUT grounds; shortest possible path to CIN is mandatory. |
| EP/DAP | Exposed thermal pad | Internally connected to AGND; primary heat dissipation path; must be soldered to large GND copper area with thermal vias. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2 kV and CDM ±750 V ESD robustness - meets automotive reliability requirements. |
| Wettable-flank–compatible WQFN | Non-wettable flank variant (QURNPRQ1) enables reliable AOI inspection while retaining thermal and electrical performance of standard WQFN-30. |
| Auto mode with diode emulation | Eliminates reverse inductor current at light loads, reducing switching losses and achieving <15 µA quiescent current - extends battery life in always-on systems. |
| Integrated high- and low-side MOSFETs | Reduces external component count by eliminating discrete HS/LS switches and freewheeling diode - simplifies layout and improves EMI performance. |
| Pre-biased start-up support | Allows safe startup into powered outputs without causing output voltage overshoot or damaging downstream circuitry - essential for hot-swap and rail-sequencing applications. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module Rail |
|---|---|
Use Scenario: Powers SoC, DSP, and display interfaces in head-unit systems requiring stable 1.2 V, 1.8 V, or 3.3 V rails from 12 V battery. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated, low-noise DC power with PGOOD signaling for system boot coordination. Use Value: Delivers 6 A at >90% efficiency across temperature, supports pre-biased start-up during ignition cycling, and maintains regulation during cold-crank (3.5 V input). | Use Scenario: Supplies image sensor and ISP in rear-view or surround-view cameras where EMI sensitivity and compact size are critical. IC Role / Device Role / Timing Role: Compact, low-EMI synchronous buck converting 12 V battery to 2.8 V or 3.3 V with precise enable sequencing and tracking. Use Value: Wettable-flank–compatible WQFN enables automated assembly; 60 ns tON-MIN supports 12 V → 2.8 V conversion; FPWM mode suppresses switching noise in analog video paths. |
| Telematics Control Unit (TCU) Core Rail | Automotive Gateway ECU Power |
Use Scenario: Generates 1.1 V core voltage for LTE/C-V2X modems and microcontrollers in cellular-connected vehicle modules. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC converter with thermal shutdown and hiccup protection for unattended operation. Use Value: RθJB = 7.3 °C/W and DAP thermal pad allow full 6 A output in confined TCU enclosures; auto mode minimizes sleep-state power draw. | Use Scenario: Provides isolated 5 V and 3.3 V rails for CAN/LIN transceivers, microcontroller, and memory in multi-protocol gateway ECUs. IC Role / Device Role / Timing Role: Dual-rail capable buck controller supporting output tracking and precise enable timing for deterministic power-up sequencing. Use Value: SS/TRK pin enables voltage ramp matching between rails; PGOOD flag coordinates firmware initialization; 350–2200 kHz range avoids AM-band interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM73605QURNPRQ1 | 5-A rated version; identical pinout, package, and feature set except lower current limit (7.3 A HS vs. 8.7 A for LM73606QURNPRQ1). | Suitable where peak load current ≤5 A; offers same thermal and electrical performance at reduced cost. | Select when system max load is ≤5 A and board layout reuse is prioritized - no changes required. |
| TPS546B24RVFT | 6-A, 4–18 V input; PMBus-enabled; 3.3-mm × 3.3-mm QFN; higher integration (digital control, telemetry) but narrower VIN range. | Better for digitally managed power systems requiring telemetry, margining, or dynamic voltage scaling - not drop-in compatible. | Choose when digital control, telemetry, or smaller footprint outweighs need for 3.5–36 V wide VIN and AEC-Q100 Grade 1 qualification. |
Compared with LM73605QURNPRQ1, the LM73606QURNPRQ1 provides higher current headroom (6 A vs. 5 A) and elevated current limits, making it preferable for future-proofing or peak-heavy automotive loads; versus TPS546B24RVFT, it trades digital configurability for broader input range, analog simplicity, and guaranteed AEC-Q100 compliance.
Availability
LM73606QURNPRQ1 is available at Aetrix Electronics and suitable for automotive infotainment power supplies, ADAS camera module rails, and telematics control unit core rails requiring stable component supply with full AEC-Q100 traceability and long-term production support.
Supply support for LM73606QURNPRQ1 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-grade power management ICs with decades of automotive qualification experience.
The LM7360x-Q1 product line was designed specifically for demanding automotive distributed power architectures, emphasizing wide VIN range, AEC-Q100 reliability, low EMI, and thermal resilience in space-constrained modules.
FAQ
What is the maximum output current capability of the LM73606QURNPRQ1?
The LM73606QURNPRQ1 delivers up to 6 A of continuous DC output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Its current-limit thresholds are 7.4–9.85 A (HS) and 5.8–7.25 A (LS), enabling robust overload handling without latch-off. Derating is required above 125°C junction temperature per thermal data in the datasheet.
Does the LM73606QURNPRQ1 support start-up into a pre-biased output?
Yes, the LM73606QURNPRQ1 supports pre-biased start-up, allowing safe activation when the output rail is already energized (e.g., during hot-swap or power-rail sequencing). This prevents reverse current flow and output voltage overshoot. The feature is enabled by default and requires no external configuration - verified in functional testing per TI's characterization report SNVSB12B.
What package type and thermal characteristics does the LM73606QURNPRQ1 use?
The LM73606QURNPRQ1 uses a 30-pin WQFN package (6.00 mm × 4.00 mm × 0.8 mm) with non-wettable flanks and an exposed thermal pad (DAP) connected to AGND. Its thermal metrics include RθJB = 7.3 °C/W and RθJC(bot) = 1 °C/W, enabling efficient heat transfer to the PCB when the DAP is soldered to a large ground plane with thermal vias.
How does the auto mode versus forced PWM (FPWM) mode affect efficiency and noise in the LM73606QURNPRQ1?
In auto mode, the LM73606QURNPRQ1 enters diode-emulation at light loads, reducing quiescent current to 15 µA and improving efficiency - ideal for always-on automotive modules. In FPWM mode, it maintains constant frequency across all loads, eliminating variable-frequency noise but increasing light-load losses. Mode selection is via the SYNC/MODE pin voltage level.
Is the LM73606QURNPRQ1 pin-compatible with other devices in the LM7360x-Q1 family?
Yes, the LM73606QURNPRQ1 is pin-to-pin compatible with the LM73605QURNPRQ1, sharing identical WQFN-30 packaging, pinout, and feature set. The only functional difference is the higher current rating (6 A vs. 5 A) and correspondingly elevated current-limit thresholds - enabling seamless current-scaling upgrades without PCB redesign.
LM73606QURNPRQ1 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)
LM73606QURNPRQ1 FAQ
1.How can I place an order for LM73606QURNPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM73606QURNPRQ1 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 LM73606QURNPRQ1 reliable?
The price and inventory of LM73606QURNPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM73606QURNPRQ1 is usually 5 days.
3.What payment methods are accepted for LM73606QURNPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM73606QURNPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM73606QURNPRQ1?
LM73606QURNPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM73606QURNPRQ1 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 LM73606QURNPRQ1?
For technical support, including LM73606QURNPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM73606QURNPRQ1 requirements.
6.How does Aetrix verify that LM73606QURNPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM73606QURNPRQ1 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 LM73606QURNPRQ1 meets industry standards.
7.What is the process for return or replacement of LM73606QURNPRQ1?
All LM73606QURNPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM73606QURNPRQ1, 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 LM73606QURNPRQ1 part is unused and in its original packaging.
Return procedure for LM73606QURNPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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