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Texas Instruments LM73606QRNPTQ1
- Part No.:
- LM73606QRNPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM73606QRNPTQ1.pdf
- Description:
- IC REG BUCK ADJ 6A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,130
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Product details
Overview
LM73606QRNPTQ1 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 - deployed in ADAS power rails and infotainment domain controllers.
For engineers reviewing the LM73606QRNPTQ1 datasheet, LM73606QRNPTQ1 pinout, LM73606QRNPTQ1 application, or LM73606QRNPTQ1 equivalent, key selection criteria include wettable-flank WQFN-30 thermal performance, auto/FPWM mode configurability, pre-biased start-up capability, and precision enable with adjustable UVLO for battery-supplied automotive subsystems.
Technical Context
The LM73606QRNPTQ1 implements peak current-mode control with internal compensation, enabling stable regulation across wide VIN/VOUT ratios without external loop components. Its tON-MIN = 60 ns and tOFF-MIN = 70 ns support high step-down ratios (e.g., 24 V → 3.3 V) while maintaining PWM operation down to 1% duty cycle.
It integrates dual power MOSFETs with RDS_ON_HS = 53 mΩ and RDS_ON_LS = 31 mΩ (typ), supports external bias (BIAS pin) for efficiency optimization at VOUT ≥ 3.3 V, and features programmable soft-start (SS/TRK), output voltage tracking, and cycle-by-cycle current limiting with hiccup recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports direct connection to automotive battery (cold-crank down to 3.5 V) and compatibility with 12 V/24 V systems. |
| Output Current | 6 A continuous - sufficient for powering multi-core SoCs, radar MMICs, or display controllers without external current sharing. |
| Switching Frequency | 350 kHz to 2.2 MHz - selectable via RT resistor or external SYNC clock; enables EMI reduction (low-freq) or compact filter design (high-freq). |
| Quiescent Current | 15 µA in active no-load mode - extends battery runtime in always-on vehicle modules such as telematics or gateway ECUs. |
| MOSFET RDS_ON | HS: 53 mΩ, LS: 31 mΩ (typ @ 1 A) - minimizes conduction loss at full load; enables >92% efficiency at 5 V/6 A with 12 V input. |
| Thermal Resistance | RθJA = 34.3°C/W (WQFN-30) - validated for 125°C ambient operation with standard 2-layer PCB and DAP soldered to ground plane. |
| Protection Features | Cycle-by-cycle current limit, hiccup short-circuit response, thermal shutdown (160°C), input UVLO, and PGOOD flag - ensures robustness in unregulated automotive environments. |
Pinout & Package
LM73606QRNPTQ1 uses a 30-pin Wettable Flanks QFN (WQFN) package, 6.00 mm × 4.00 mm × 0.8 mm, with exposed thermal pad (DAP) soldered to PCB ground for enhanced heat dissipation and solder-joint inspection capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–5, 22, 26, SW | Power switch node | Internally connects HS drain and LS source; drives external inductor and CBOOT capacitor - requires tight layout with minimal trace inductance. |
| 6, CBOOT | Bootstrap supply | Connects 470-nF ceramic capacitor to SW; supplies gate drive for high-side MOSFET - critical for reliable HS turn-on. |
| 7, VCC | Internal bias LDO output | Provides regulated ~3.2 V supply for control circuitry; requires 2.2-µF bypass capacitor to AGND - not intended for external loading. |
| 8, BIAS | Optional auxiliary supply input | Accepts external 3.3 V/5 V rail or VOUT to improve light-load efficiency; must not exceed VIN - enables <15 µA IQ in battery-critical modes. |
| 9, RT | Frequency setting | Resistor-to-ground sets fSW from 350 kHz to 2.2 MHz; floating defaults to ~500 kHz - allows EMI tuning without changing inductors. |
| 10, SS/TRK | Soft-start & tracking | Sources 2 µA current for external capacitor-based ramp; also accepts external voltage for output voltage sequencing - prevents inrush and enables multi-rail coordination. |
| 11, FB | Voltage feedback input | Monitors resistive divider output; 1.006 V reference enables precise VOUT programming (e.g., 1.0 V ±1% for core rails). |
| 16, PGOOD | Power-good flag | Open-drain output asserts high when VOUT is within ±5% of target; deglitched with 140 µs delay - used for processor reset or system enable sequencing. |
| 17, SYNC/MODE | Mode selection & sync input | Ground = auto mode (PFM/CCM); logic high = forced PWM; external clock = synchronized FPWM - determines noise profile and light-load behavior. |
| 18, EN | Precision enable | Adjustable UVLO threshold (1.14–1.25 V rising); hysteresis improves noise immunity - supports controlled startup from weak battery sources. |
| 19, AGND | Analog ground reference | Reference for FB, RT, SS/TRK, and internal circuits; must be star-connected to PGND near device - essential for voltage accuracy and stability. |
| 20–22, PVIN | Main input power | Supplies HS FET and internal LDO; requires local 10–22 µF ceramic CIN with short, wide traces to PGND - critical for EMI suppression and transient response. |
| 23–26, PGND | Power ground return | Source node of LS FET; must be low-inductance path to CIN, COUT, AGND, and DAP - primary current return for high di/dt switching currents. |
| EP/DAP | Thermal pad | Low-impedance connection to AGND/PGND; mandatory for thermal performance and reliability - requires ≥9 thermal vias to inner ground layers. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2 kV / CDM ±750 V ESD robustness - meets automotive functional safety requirements. |
| Wettable flanks WQFN-30 package | Enables automated optical inspection (AOI) of solder joints and improves board-level reliability in thermal cycling environments. |
| Auto mode with PFM frequency foldback | Reduces switching losses at light loads by lowering fSW below 500 kHz - achieves 15 µA IQ and >85% efficiency at 10 mA output. |
| Pre-biased start-up capability | Allows safe startup into powered outputs (e.g., shared VDD rails) without reverse current or output overshoot - eliminates need for external diodes. |
| Internal compensation | Eliminates external Type-II/III compensation network - reduces BOM count and layout sensitivity while maintaining phase margin >45°. |
| Pin-selectable FPWM/auto mode | Configured via SYNC/MODE pin; avoids software configuration overhead and supports deterministic timing in real-time systems. |
Applications
| ADAS Camera Power Supply | Infotainment Domain Controller |
|---|---|
Use Scenario: Powers image sensor, ISP, and MIPI interface in front-facing camera module with strict EMI limits and cold-crank survival. IC Role / Device Role / Timing Role: Primary 3.3 V/6 A buck regulator with pre-biased start-up and PGOOD sequencing for SoC reset. Use Value: 60 ns tON-MIN enables stable 3.3 V output from 6 V cold-crank input; wettable flanks ensure field-reliable solder joints under vibration. |
Use Scenario: Supplies 1.0 V core and 1.8 V I/O rails for quad-core ARM-based infotainment SoC in head unit. IC Role / Device Role / Timing Role: High-current synchronous buck with tracking (SS/TRK) for coordinated multi-rail power-up. Use Value: Internal compensation and 350–2200 kHz fSW range allow optimized filter size/noise trade-off; BIAS pin improves efficiency at 1.8 V output. |
| Telematics Control Unit (TCU) | Automotive Gateway ECU |
Use Scenario: Powers LTE modem, GNSS receiver, and CAN FD transceivers in always-on cellular connectivity module. IC Role / Device Role / Timing Role: Low-IQ buck converter with precision enable and adjustable UVLO for wake-from-sleep functionality. Use Value: 15 µA active no-load IQ extends battery backup time; EN hysteresis prevents false wake-ups during battery ripple. |
Use Scenario: Generates 5 V intermediate rail for multiple CAN, LIN, and Ethernet PHYs in zonal architecture gateway. IC Role / Device Role / Timing Role: Wide-VIN buck with SYNC input to align switching edges across multiple converters and reduce conducted EMI peaks. Use Value: Synchronization capability enables deterministic noise spectrum; RDS_ON_HS/LS values minimize thermal rise at 5 V/4 A load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM73605QRNPTQ1 | Same WQFN-30 package and pinout; rated for 5 A max output current; identical feature set except lower current capability. | Suitable where 5 A suffices and board reuse is prioritized; shares same layout and bill-of-materials except output inductor and COUT sizing. | Select when system load is ≤5 A and cost optimization is required without redesign. |
| TPS546B24RVFT | 6 A, 4.5–18 V input, PMBus-enabled; requires external compensation and digital configuration; no wettable flanks. | Used where telemetry, margining, or dynamic voltage scaling is needed; lacks AEC-Q100 Grade 1 qualification and automotive thermal specs. | Choose only if digital control and telemetry outweigh analog simplicity and automotive qualification. |
Compared with LM73605QRNPTQ1 and TPS546B24RVFT, LM73606QRNPTQ1 delivers higher current in a drop-in automotive-qualified package with zero-config analog operation - making it optimal for cost-sensitive, high-reliability 12 V/24 V subsystems where digital overhead is unnecessary.
Availability
LM73606QRNPTQ1 is available at Aetrix Electronics and suitable for automotive ADAS, infotainment, telematics, and gateway applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LM73606QRNPTQ1 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 delivers high-efficiency, small-footprint synchronous buck converters designed specifically for demanding automotive power rails - emphasizing thermal robustness, EMI control, and functional safety readiness.
FAQ
What is the maximum input voltage rating for LM73606QRNPTQ1?
The absolute maximum input voltage (PVIN to PGND) for LM73606QRNPTQ1 is 42 V, but the recommended operating range is 3.5 V to 36 V. Operation above 36 V risks exceeding thermal limits or violating safe operating area margins, especially at high ambient temperatures. TI specifies 36 V as the upper limit for continuous reliable operation per AEC-Q100 stress testing protocols. Always maintain input transient clamping within this envelope for automotive deployment.
Does LM73606QRNPTQ1 support start-up into a pre-biased output?
Yes, LM73606QRNPTQ1 supports start-up into a pre-biased output without reverse current or output overshoot. This is achieved through internal control of the low-side MOSFET during soft-start, preventing discharge of the output capacitor. The feature is enabled by default and requires no external components - critical for use in multi-rail systems where downstream regulators may already be powered.
What package type and thermal characteristics does LM73606QRNPTQ1 have?
LM73606QRNPTQ1 uses a 30-pin Wettable Flanks QFN (WQFN) package measuring 6.00 mm × 4.00 mm. Its thermal metrics include RθJA = 34.3°C/W (JEDEC-standard 2-layer board), RθJC(bot) = 1°C/W, and junction-to-board ψJB = 7.1°C/W. The exposed thermal pad (DAP) must be soldered to a solid ground plane with ≥9 thermal vias for compliance with AEC-Q100 Grade 1 thermal requirements up to +125°C ambient.
How is switching frequency configured on LM73606QRNPTQ1?
Switching frequency on LM73606QRNPTQ1 is configured either by connecting a resistor from the RT pin to AGND (350 kHz to 2.2 MHz), leaving RT floating (~500 kHz default), or applying an external clock signal to the SYNC/MODE pin. The device synchronizes to the rising edge of the external clock and maintains forced PWM operation - enabling deterministic EMI reduction in multi-converter systems.
What protection features are integrated into LM73606QRNPTQ1?
LM73606QRNPTQ1 integrates cycle-by-cycle overcurrent limiting (HS/LS thresholds), hiccup-mode short-circuit recovery, thermal shutdown (160°C trip, 135°C recovery), input undervoltage lockout (UVLO), and power-good (PGOOD) monitoring. All protections are hardware-based with no software dependency - ensuring fail-safe behavior during fault conditions in automotive environments.
LM73606QRNPTQ1 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)
LM73606QRNPTQ1 FAQ
1.How can I place an order for LM73606QRNPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM73606QRNPTQ1 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 LM73606QRNPTQ1 reliable?
The price and inventory of LM73606QRNPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM73606QRNPTQ1 is usually 5 days.
3.What payment methods are accepted for LM73606QRNPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM73606QRNPTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM73606QRNPTQ1?
LM73606QRNPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM73606QRNPTQ1 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 LM73606QRNPTQ1?
For technical support, including LM73606QRNPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM73606QRNPTQ1 requirements.
6.How does Aetrix verify that LM73606QRNPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM73606QRNPTQ1 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 LM73606QRNPTQ1 meets industry standards.
7.What is the process for return or replacement of LM73606QRNPTQ1?
All LM73606QRNPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM73606QRNPTQ1, 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 LM73606QRNPTQ1 part is unused and in its original packaging.
Return procedure for LM73606QRNPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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