My Inquiry
My Account
Texas Instruments LM73605QURNPRQ1
- Part No.:
- LM73605QURNPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM73605QURNPRQ1.pdf
- Description:
- IC REG BUCK ADJ 5A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM73605QURNPRQ1 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 supports pre-biased start-up and operates in automotive body control modules and ADAS power rails.
For engineers reviewing the LM73605QURNPRQ1 datasheet, LM73605QURNPRQ1 pinout, LM73605QURNPRQ1 application, or LM73605QURNPRQ1 equivalent, key selection criteria include its non-wettable-flank WQFN-30 package, auto/FPWM mode selectability, precision enable with UVLO threshold of 1.14 V, and integrated cycle-by-cycle current limiting with 7.3 A typical high-side trip point.
Technical Context
The LM73605QURNPRQ1 employs fixed-frequency peak current-mode control with internal compensation, enabling stable regulation across wide VIN–VOUT ratios. Its architecture integrates both high-side and low-side power MOSFETs, supports external clock synchronization, and implements automated frequency foldback at extreme duty cycles to maintain regulation.
It features dual operating modes: auto mode (diode emulation at light loads for ultra-low quiescent current of 15 µA) and forced PWM mode (constant frequency, negative inductor current capability). The device includes precision enable with hysteresis, programmable soft-start via SS/TRK pin, and tracking functionality for multi-rail sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 3.5 V to 36 V - supports direct battery connection in 12-V and 24-V automotive systems without pre-regulation |
| Output current | Up to 5 A - sufficient for powering microcontrollers, sensors, and CAN transceivers in distributed ECUs |
| Switching frequency | 350 kHz to 2.2 MHz - selectable via RT resistor or external SYNC signal; enables optimization for EMI or efficiency |
| Quiescent current | 15 µA in active no-load mode - extends battery life in always-on vehicle subsystems |
| HS/LS RDS(on) | 53 mΩ / 31 mΩ - reduces conduction losses and thermal stress at full load in compact layouts |
| tON-MIN/tOFF-MIN | 60 ns / 70 ns - enables high step-down ratios (e.g., 24 V → 3.3 V) at 2.2 MHz without pulse skipping |
| Thermal shutdown | 160 °C shutdown / 135 °C recovery - protects against sustained overload or poor heatsinking in sealed enclosures |
Pinout & Package
The LM73605QURNPRQ1 is housed in a 30-pin non-wettable-flank WQFN package (6.00 mm × 4.00 mm × 0.8 mm), optimized for automotive thermal and EMI performance with exposed DAP connected to AGND for low-impedance heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1–5, 22, 26) | Power switch node | Internally connects HS drain and LS source; requires direct routing to inductor and CBOOT with minimal loop area |
| CBOOT (Pin 6) | Bootstrap capacitor terminal | Supplies gate drive for HS FET; must use 470-nF ceramic capacitor tied to SW pin |
| VCC (Pin 7) | Internal bias LDO output | Powers internal control circuitry; requires 2.2-µF bypass capacitor to PGND; not for external loading |
| BIAS (Pin 8) | Optional auxiliary supply input | Improves efficiency when tied to VOUT (3.3–18 V) or external 3.3/5 V rail; must not exceed VIN |
| RT (Pin 9) | Frequency setting input | Resistor-to-ground sets fSW; open-circuit defaults to ~500 kHz; enables precise EMI band placement |
| SS/TRK (Pin 10) | Soft-start and tracking control | 2-µA current source charges external capacitor for adjustable ramp; also accepts external voltage for rail tracking |
| FB (Pin 11) | Feedback reference input | Senses output via resistor divider; 1.006 V typical reference enables accurate VOUT programming (e.g., 3.3 V ±1%) |
| PGOOD (Pin 16) | Open-drain power-good flag | Signals regulation status (high = OK); active below 1.3 V input; includes 1.2% hysteresis for noise immunity |
| SYNC/MODE (Pin 17) | Mode selection and sync input | GND = auto mode; logic high = FPWM; external clock = synchronized FPWM; critical for multi-converter noise control |
| EN (Pin 18) | Enable with precision UVLO | Turns regulator on/off; rising threshold 1.14 V (±50 mV hysteresis); supports adjustable input UVLO via resistor divider |
| AGND (Pin 19) | Analog ground reference | Reference for FB, RT, SS/TRK, and internal circuits; must be star-connected to PGND near DAP |
| PVIN (Pins 20–22) | Main power input | Supplies HS FET and internal LDO; requires low-ESR CIN placed adjacent to PVIN and PGND pins |
| PGND (Pins 23–26) | Power ground return | Source of LS FET; must be solid copper plane tied to DAP and CIN/COUT grounds with multiple thermal vias |
| DAP/EP | Exposed thermal pad | Low-impedance path to AGND; mandatory for thermal performance; requires ≥9 solder mask openings and ≥6 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 |
| Integrated HS/LS MOSFETs | Eliminates external diode and driver; reduces BOM count by ≥4 components and PCB area by >30% vs discrete buck |
| Auto mode with PFM | Reduces light-load IQ to 15 µA while maintaining regulation-critical for always-on telematics and gateway modules |
| Pre-biased start-up support | Enables safe turn-on into powered outputs (e.g., hot-swap systems or cascaded regulators) without output voltage reversal |
| Internal compensation | Removes need for external Type II/III compensation network-cuts design time and layout sensitivity to parasitics |
| Programmable soft-start & tracking | SS/TRK pin allows single-capacitor soft-start or coordinated ramping with other rails-essential for FPGA/CPU power sequencing |
Applications
| Automotive Body Control Module (BCM) | ADAS Camera Power Supply |
|---|---|
|
Use Scenario: Powers MCU, LIN transceivers, and LED drivers in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V point-of-load regulator with precise enable sequencing and low-noise operation. Use Value: Delivers 5 A at 92% efficiency (12 V → 5 V, 500 kHz), meets CISPR-25 Class 5 EMI limits via spread-spectrum-capable SYNC pin. |
Use Scenario: Supplies image sensor and ISP in rear-view or surround-view camera systems. IC Role / Device Role / Timing Role: High-PSRR, low-ripple buck converter with tracking for analog and digital rail coordination. Use Value: Achieves <15 mVpp output ripple at 3 A load using internal compensation and 2.2-MHz switching-minimizes sensor noise artifacts. |
| Automotive Telematics Gateway | Electric Power Steering (EPS) ECU |
|
Use Scenario: Provides isolated 3.3-V rail for cellular modem and GNSS receiver in connected car platforms. IC Role / Device Role / Timing Role: Always-on buck with ultra-low 15-µA quiescent current and wake-up via precision EN pin. Use Value: Extends battery hold-up time beyond 120 days during vehicle sleep mode while supporting fast wake-up response. |
Use Scenario: Generates 5-V supply for motor control MCU and CAN FD transceiver in EPS actuator units. IC Role / Device Role / Timing Role: Robust, fault-tolerant buck with hiccup-mode short-circuit protection and thermal shutdown. Use Value: Withstands 42-V load-dump transients and sustains 5-A continuous load at 105°C ambient-validated per ISO 7637-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM73606QURNPRQ1 | Same pinout, 6-A rating, higher RDS(on) (HS: 45 mΩ typ, LS: 27 mΩ typ), identical features and package | Preferred where >5 A peak load or higher thermal margin is required; shares same PCB footprint | Select LM73606QURNPRQ1 if future-proofing for higher current or derating headroom is needed; no layout change required |
| TPS54560QDGQRQ1 | Non-synchronous, 60-V max input, 5-A output, external diode, higher QG and larger solution size | Better suited for cost-sensitive, lower-efficiency designs where 40-V transients dominate over EMI constraints | Choose TPS54560QDGQRQ1 only when input voltage exceeds 36 V or wettable flanks are unnecessary; requires diode and extra layout area |
Compared with LM73606QURNPRQ1, the LM73605QURNPRQ1 offers tighter current-limit matching for 5-A systems and slightly lower light-load IQ; versus TPS54560QDGQRQ1, it delivers superior efficiency, smaller footprint, and integrated EMI reduction-making it optimal for space-constrained, noise-sensitive automotive modules.
Availability
LM73605QURNPRQ1 is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera power supplies, and telematics gateway designs requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM73605QURNPRQ1 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 expertise.
The LM7360x-Q1 product line delivers high-current, wide-input synchronous buck converters engineered specifically for demanding automotive power rails-including BCM, ADAS, and infotainment systems-where reliability, thermal performance, and EMI control are critical.
FAQ
What is the maximum input voltage rating for the LM73605QURNPRQ1?
The LM73605QURNPRQ1 has an absolute maximum PVIN-to-PGND rating of 42 V, but its recommended operating input voltage range is 3.5 V to 36 V. Operation above 36 V may trigger internal protection or reduce reliability; for 42-V transient tolerance, external clamping or TVS devices are advised. The LM73605QURNPRQ1 is validated per ISO 7637-2 for load-dump immunity when properly designed.
Does the LM73605QURNPRQ1 support pre-biased start-up?
Yes, the LM73605QURNPRQ1 supports pre-biased start-up, allowing safe turn-on when the output rail is already energized (e.g., from another regulator or backup source). This prevents reverse current flow and output voltage overshoot. The feature is enabled by default and requires no configuration-verified across –40°C to +125°C ambient per AEC-Q100 requirements.
How does the auto mode vs. forced PWM mode affect efficiency in the LM73605QURNPRQ1?
In auto mode, the LM73605QURNPRQ1 enters diode emulation (PFM) at light loads, reducing switching losses and achieving 15 µA quiescent current-ideal for always-on automotive modules. In forced PWM mode, it maintains constant frequency regardless of load, improving EMI predictability but increasing light-load losses due to negative inductor current and fixed gate drive. Efficiency divergence begins below ~100 mA output.
What is the purpose of the BIAS pin on the LM73605QURNPRQ1?
The BIAS pin on the LM73605QURNPRQ1 provides an optional auxiliary supply path to improve conversion efficiency. When tied to VOUT (for 3.3–18 V outputs) or an external 3.3/5 V rail, it powers the high-side gate driver directly-reducing VCC LDO losses and boosting full-load efficiency by up to 2%. If unused, the BIAS pin must be grounded per datasheet guidelines.
Can the LM73605QURNPRQ1 be synchronized to an external clock?
Yes, the LM73605QURNPRQ1 can be synchronized to an external clock via the SYNC/MODE pin, accepting TTL/CMOS-compatible signals from 350 kHz to 2.2 MHz. This enables deterministic EMI reduction in multi-converter systems (e.g., camera + radar modules) and eliminates beat frequencies. External sync overrides the RT resistor setting and forces FPWM operation with tight timing alignment.
LM73605QURNPRQ1 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)
LM73605QURNPRQ1 FAQ
1.How can I place an order for LM73605QURNPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM73605QURNPRQ1 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 LM73605QURNPRQ1 reliable?
The price and inventory of LM73605QURNPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM73605QURNPRQ1 is usually 5 days.
3.What payment methods are accepted for LM73605QURNPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM73605QURNPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM73605QURNPRQ1?
LM73605QURNPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM73605QURNPRQ1 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 LM73605QURNPRQ1?
For technical support, including LM73605QURNPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM73605QURNPRQ1 requirements.
6.How does Aetrix verify that LM73605QURNPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM73605QURNPRQ1 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 LM73605QURNPRQ1 meets industry standards.
7.What is the process for return or replacement of LM73605QURNPRQ1?
All LM73605QURNPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM73605QURNPRQ1, 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 LM73605QURNPRQ1 part is unused and in its original packaging.
Return procedure for LM73605QURNPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM73605QURNPRQ1 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
