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Texas Instruments LM73605RNPR
- Part No.:
- LM73605RNPR
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM73605RNPR.pdf
- Description:
- IC REG BUCK ADJ 5A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,164
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Product details
Overview
LM73605RNPR from Texas Instruments is a 3.5-V to 36-V, 5-A synchronous step-down DC/DC converter in a 30-pin WQFN (6 mm × 4 mm) wettable flanks package. It features peak current-mode control, 60 ns minimum on-time, 53 mΩ high-side and 31 mΩ low-side MOSFETs, and supports auto mode or forced PWM operation for industrial power supplies delivering 5 V or 3.3 V at up to 5 A.
For engineers reviewing the LM73605RNPR datasheet, LM73605RNPR pinout, LM73605RNPR application, or LM73605RNPR equivalent, key selection criteria include input voltage range (3.5–36 V), output current capability (5 A), thermal performance (RθJA = 34.3°C/W), programmable switching frequency (350 kHz–2.2 MHz), and support for pre-biased start-up and voltage tracking in compact PCB layouts.
Technical Context
The LM73605RNPR employs fixed-frequency peak current-mode control with internal compensation, eliminating external loop components. Its dual-mode operation-pin-selectable auto mode (diode emulation at light loads) and forced PWM (constant frequency across load)-enables optimization for efficiency or EMI-sensitive systems.
It integrates high- and low-side MOSFETs with confirmed RDS(on) values (53 mΩ HS / 31 mΩ LS at 1 A), supports external bias input (BIAS pin) to improve light-load efficiency, and includes cycle-by-cycle current limiting, hiccup-mode short-circuit protection, and thermal shutdown at 160°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide-input industrial, automotive, and test equipment rails without pre-regulation. |
| Output Current | 5 A continuous - delivers full rated load with ≤95% duty cycle and validated thermal derating per RθJA = 34.3°C/W. |
| Switching Frequency | 350 kHz to 2.2 MHz - adjustable via RT resistor or synchronizable to external clock for EMI compliance. |
| Min. On/Off Time | 60 ns / 70 ns - enables high VIN-to-VOUT conversion ratios (e.g., 24 V → 3.3 V) without pulse-skipping instability. |
| Quiescent Current | 15 µA active (no load) - extends battery life in always-on industrial sensors and portable instrumentation. |
| Feedback Reference | 1.006 V ±1.5% - ensures ±1% output regulation accuracy over line, load, and temperature with standard resistor dividers. |
| Power-Good Flag | Open-drain PGOOD with 86–93% UV and 106–113% OV thresholds - provides reliable system sequencing and fault detection. |
Pinout & Package
LM73605RNPR is housed in a 30-pin Wettable Flanks QFN (RNP) package measuring 6.00 mm × 4.00 mm × 0.8 mm, with exposed thermal pad (DAP) soldered to PCB ground for optimal heat dissipation (RθJC(bot) = 1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–5, 22, 26, SW | Switch node | Internally connects HS drain and LS source; routes high di/dt current to inductor and CBOOT; requires tight layout to minimize EMI. |
| 6, CBOOT | Bootstrap supply | Connects 470-nF ceramic capacitor to SW; enables gate drive for integrated high-side MOSFET. |
| 7, VCC | Internal bias rail | 3.27-V LDO output powering control logic; requires 2.2-µF bypass to AGND; not for external loading. |
| 8, BIAS | External bias input | Accepts 3.3 V or 5 V rail (or VOUT if 3.3–18 V) to reduce power loss in internal LDO and boost light-load efficiency. |
| 9, RT | Frequency set | Resistor-to-ground sets fSW from 350 kHz to 2.2 MHz; open circuit defaults to ~500 kHz. |
| 10, SS/TRK | Soft-start & tracking | 2-µA current source charges external cap for adjustable ramp; connect to external voltage for output tracking. |
| 11, FB | Voltage feedback | High-impedance input referenced to 1.006 V; connects resistor divider to set VOUT; never short to ground. |
| 16, PGOOD | Power-good flag | Open-drain output asserted high when VOUT is within ±10% of target; requires pull-up resistor to system rail. |
| 17, SYNC/MODE | Mode control | Ground = auto mode (PFM/DEM); logic high = forced PWM; external clock = sync; not floating. |
| 18, EN | Enable input | Logic-controlled ON/OFF with precision UVLO threshold (1.14–1.25 V rising); supports resistor-divider programmable input UVLO. |
| 19, AGND | Analog ground | Reference for FB, RT, SS/TRK, and internal circuits; must be star-connected to PGND near device. |
| 20–22, PVIN | Main power input | Supplies HS FET and internal bias LDO; requires local 10-µF ceramic CIN placed adjacent to pins and PGND. |
| 23–26, PGND | Power ground | Source connection of LS FET; ties to DAP, AGND, CIN, and COUT grounds; shortest possible path critical for stability. |
| EP/DAP | Thermal pad | Low-impedance AGND connection; must be soldered to large PCB ground plane with ≥9 thermal vias for thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 53 mΩ HS / 31 mΩ LS MOSFETs eliminate external diode losses, enabling >95% efficiency at 5 A (12 V → 5 V). |
| Wettable flanks package | 30-pin WQFN with side-wettable leads enables automated optical solder-joint inspection for high-reliability industrial assembly. |
| Flexible soft-start | Configurable fixed or adjustable ramp (via SS/TRK cap), pre-biased start-up, and output voltage tracking simplify multi-rail sequencing. |
| Auto/FPWM mode select | Pin-strapped operation: auto mode maximizes light-load efficiency via PFM/DEM; FPWM guarantees constant fSW for noise-sensitive applications. |
| Robust protection suite | Cycle-by-cycle current limiting, hiccup-mode short-circuit response, thermal shutdown (160°C), and UVLO prevent fault propagation in harsh environments. |
Applications
| Industrial Distributed Power | Test & Measurement Equipment |
|---|---|
Use Scenario: 24-V factory floor bus powering isolated 5-V/3.3-V rails for PLC I/O modules and fieldbus transceivers. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 5-A output with high efficiency across variable load profiles. Use Value: Wide 3.5–36-V input accommodates brownout and surge conditions; 60 ns tON-MIN ensures stable 24 V → 3.3 V conversion without dropout. | Use Scenario: Portable oscilloscope or multimeter requiring ultra-low-noise 3.3-V analog supply and clean 5-V digital rail from single Li-ion or 12-V adapter. IC Role / Device Role / Timing Role: Dual-output synchronous buck controller (with external L/C) generating precision low-noise rails with independent soft-start. Use Value: Forced PWM mode eliminates frequency modulation noise in sensitive analog front-ends; PGOOD enables safe processor boot sequencing. |
| General-Purpose Wide VIN Systems | Automotive Aftermarket Electronics |
Use Scenario: Universal power adapter for embedded gateways supporting 9–36-V DC inputs (e.g., PoE++, solar charge controllers, railway telemetry). IC Role / Device Role / Timing Role: High-efficiency primary DC/DC stage converting unregulated input to stable 5-V/12-V intermediate bus. Use Value: 350 kHz–2.2 MHz programmable fSW allows layout optimization: high fSW shrinks magnetics; low fSW improves efficiency at full load. | Use Scenario: In-vehicle infotainment display or ADAS camera module powered from 12-V battery with cold-crank (4.5 V) and load-dump (42 V) tolerance. IC Role / Device Role / Timing Role: Input-stage buck converter protecting downstream electronics with robust 42-V absolute max rating and thermal foldback. Use Value: Validated operation down to 3.5 V enables startup during cold cranking; 150°C max junction rating supports under-hood mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM73606RNPR | Same package and pinout; rated for 6 A output current; higher HS/LS current limits (7.4 A / 5.8 A vs. 6 A / 4.8 A). | Required where sustained >5 A load or higher peak current margin is needed; identical thermal design but higher current capability. | Select LM73606RNPR when future-proofing for 6-A loads or operating near LM73605RNPR's thermal limit at full 5 A. |
| LM61460RQWR | 60-V input rating; lower quiescent current (1.5 µA shutdown); improved EMI performance via spread-spectrum and optimized pinout. | Better suited for automotive (ISO 7637-2) or high-voltage industrial inputs; not drop-in due to different package (16-pin QFN) and pin assignment. | Choose LM61460RQWR for new designs needing >36-V input, ultra-low IQ, or stricter EMI requirements - not a pin-compatible replacement. |
Compared with LM73606RNPR, LM73605RNPR offers tighter current-limit margins and slightly lower thermal resistance at 5-A operation; versus LM61460RQWR, it trades higher input voltage range and lower IQ for proven 36-V robustness and direct pin compatibility in existing LM73605 footprints.
Availability
LM73605RNPR is available at Aetrix Electronics and suitable for industrial distributed power, test and measurement equipment, and general-purpose wide VIN systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM73605RNPR 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 power management ICs, with decades of expertise in high-reliability DC/DC conversion.
The LM73605RNPR belongs to TI's wide-input synchronous buck converter product line, designed specifically for industrial, test equipment, and automotive aftermarket applications demanding high efficiency, small solution size, and robust protection across 3.5–36-V input ranges.
FAQ
What is the maximum input voltage rating for LM73605RNPR?
The LM73605RNPR 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. Operation beyond 36 V is not advised for sustained use, though transient 42-V events (e.g., load dump) are tolerated per datasheet stress ratings. The device remains functional and protected within its specified 3.5–36-V operating window, and LM73605RNPR maintains regulation and protection features across this full range.
Does LM73605RNPR support output voltage tracking?
Yes, LM73605RNPR supports output voltage tracking via the SS/TRK pin. When an external ramp voltage is applied to this pin, the internal soft-start circuit follows that reference, enabling coordinated power-up sequencing of multiple rails. This feature is explicitly documented in the datasheet's "Soft-Start Control" section and verified in typical application schematics. LM73605RNPR implements tracking without additional ICs, simplifying multi-rail designs.
Can LM73605RNPR operate with a pre-biased output?
Yes, LM73605RNPR supports start-up into a pre-biased output, a feature confirmed in the datasheet's "Flexible Soft-Start Features" list and functional description. This capability prevents reverse current flow and output overshoot when the output capacitor is already charged, making LM73605RNPR suitable for hot-swap and redundant power systems. The internal control logic actively manages gate timing to avoid forcing current backward through the inductor.
What is the thermal resistance (RθJA) of LM73605RNPR in its standard layout?
The published junction-to-ambient thermal resistance (RθJA) for LM73605RNPR in the RNP (WQFN) package is 34.3°C/W, measured under JEDEC JESD51-7 standard PCB conditions (2s2p copper). This value assumes proper thermal design: DAP soldered to ≥1 in² ground plane with ≥9 thermal vias. LM73605RNPR achieves this performance only with recommended layout; inadequate copper or via count will degrade actual thermal performance.
Is LM73605RNPR pin-compatible with LM73606RNPR?
Yes, LM73605RNPR is pin-to-pin compatible with LM73606RNPR per TI's official device information table and functional descriptions. Both share identical 30-pin WQFN (RNP) packaging, pin configuration, and signal mapping - enabling current scalability by swapping devices without PCB revision. LM73605RNPR and LM73606RNPR differ only in current rating (5 A vs. 6 A) and corresponding current-limit thresholds, with no changes to pin function or electrical interface.
LM73605RNPR 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 30-WQFN (6x4)
LM73605RNPR FAQ
1.How can I place an order for LM73605RNPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM73605RNPR 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 LM73605RNPR reliable?
The price and inventory of LM73605RNPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM73605RNPR is usually 5 days.
3.What payment methods are accepted for LM73605RNPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM73605RNPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM73605RNPR?
LM73605RNPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM73605RNPR 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 LM73605RNPR?
For technical support, including LM73605RNPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM73605RNPR requirements.
6.How does Aetrix verify that LM73605RNPR is sourced from the original manufacturer or authorized distributors?
All LM73605RNPR 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 LM73605RNPR meets industry standards.
7.What is the process for return or replacement of LM73605RNPR?
All LM73605RNPR units undergo pre-shipment inspection (PSI). If there is an issue with LM73605RNPR, 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 LM73605RNPR part is unused and in its original packaging.
Return procedure for LM73605RNPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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