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Texas Instruments LM73605RNPT
- Part No.:
- LM73605RNPT
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM73605RNPT.pdf
- Description:
- IC REG BUCK ADJ 5A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:996
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Product details
Overview
LM73605RNPT 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 rails delivering 5 V or 3.3 V at up to 5 A.
For engineers reviewing the LM73605RNPT datasheet, LM73605RNPT pinout, LM73605RNPT application, or LM73605RNPT equivalent, key selection considerations 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 precision enable with adjustable UVLO.
Technical Context
The LM73605RNPT employs fixed-frequency peak current-mode control with internal compensation and configurable operation modes: auto mode enables diode emulation at light loads for ultra-low quiescent current (15 µA active, 0.8 µA shutdown), while forced PWM maintains constant frequency across load. It integrates both high-side and low-side MOSFETs with confirmed RDS(on) of 53 mΩ (HS) and 31 mΩ (LS) at 1 A, 3.3 V bias.
Key system-level behaviors include automated frequency foldback at extreme duty cycles, cycle-by-cycle current limiting (7.3 A HS limit), hiccup-mode short-circuit protection, and flexible soft-start with pre-biased load startup and voltage tracking. The device uses an external RT resistor or SYNC signal for frequency setting and supports external BIAS rail connection to improve efficiency when VOUT ≥ 3.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide industrial and automotive supply rails without pre-regulation |
| Output Current | 5 A continuous - delivers full rated load with thermal derating per RθJA = 34.3°C/W |
| Switching Frequency | 350 kHz to 2.2 MHz - set by RT resistor or external clock; enables optimization for size (high-f) or efficiency (low-f) |
| 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 |
| MOSFET RDS(on) | HS = 53 mΩ, LS = 31 mΩ - reduces conduction loss; critical for >90% efficiency at 5 A, 12 V→5 V |
| Quiescent Current | 15 µA (active, no load), 0.8 µA (shutdown) - extends battery life in always-on systems |
| Feedback Voltage | 1.006 V (typ) - sets output accuracy; used with resistor divider to program VOUT from 1 V to 95% of VIN |
Pinout & Package
LM73605RNPT is housed in a 30-pin WQFN (RNP) package with wettable flanks, 6.00 mm × 4.00 mm body size and 0.8 mm height. Exposed thermal pad (DAP) connects internally to AGND and serves as primary heat dissipation path; requires soldered ground plane and thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–5, 22, 26 SW | Switch node | Internally connects HS drain and LS source; drives external inductor and CBOOT; high dV/dt node requiring tight layout |
| 6 CBOOT | Bootstrap capacitor terminal | Supplies gate drive for HS FET; requires 470-nF ceramic cap to SW with minimal loop area |
| 7 VCC | Internal LDO output | Provides bias for control circuitry; must be decoupled with 2.2-µF capacitor to AGND; not for external loading |
| 8 BIAS | Optional external bias input | Improves efficiency when tied to VOUT (3.3–18 V) or clean 3.3/5 V rail; must not exceed VIN |
| 9 RT | Frequency setting input | Resistor-to-ground sets fSW; open = 500 kHz; 17.4 kΩ = 2.2 MHz; floating prohibited |
| 10 SS/TRK | Soft-start & tracking control | 2-µA current source charges external cap for adjustable ramp; connect to external voltage for output tracking |
| 11 FB | Feedback input | Monitors resistive divider; 1.006 V reference sets VOUT; never short to ground during operation |
| 16 PGOOD | Open-drain power-good flag | Active-low signal indicates regulation within ±10%; requires pull-up; asserts low if EN = 0 or VIN < 1.3 V |
| 17 SYNC/MODE | Mode selection & sync input | Tie to GND = auto mode; logic high = FPWM; external clock = synchronized FPWM; never float |
| 18 EN | Enable input | Logic-high enables regulator; precision UVLO threshold (1.14–1.25 V) allows programmable input undervoltage lockout |
| 19 AGND | Analog ground reference | Reference for FB, RT, SS/TRK, PGOOD; separate from PGND; connect directly to PCB ground plane |
| 20–22 PVIN | Main power input | Supplies HS FET and internal LDO; requires local CIN with short, wide traces to PGND pins |
| 23–26 PGND | Power ground | Source of LS FET; connects to DAP/EP; must tie to system ground, CIN, COUT, and AGND |
| EP (DAP) | Exposed thermal pad | Low-impedance connection to AGND; mandatory for thermal performance; requires solder and ≥6 thermal vias |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 53 mΩ HS / 31 mΩ LS MOSFETs eliminate external diode, enabling >95% efficiency at 5 A and reducing solution size |
| Auto mode operation | Diode emulation at light loads cuts quiescent current to 15 µA, extending runtime in battery-powered industrial sensors |
| Adjustable soft-start & tracking | Programmable ramp time and external voltage tracking support hot-swap and multi-rail sequencing in FPGA or ASIC power systems |
| Robust protection suite | Cycle-by-cycle current limiting (7.3 A HS), hiccup-mode short-circuit response, and thermal shutdown (160°C) ensure reliable field operation |
| Wettable flanks QFN | 30-pin RNP package enables automated optical inspection (AOI) of solder joints, improving manufacturing yield for high-reliability PCBs |
Applications
| Industrial Distributed Power | Test & Measurement Equipment |
|---|---|
Use Scenario: Powering isolated I/O modules, PLC backplanes, and sensor transmitters from 24-V DC rails in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 5-V/3.3-V point-of-load regulator delivering 5 A with high efficiency across 10–100% load and immunity to input ripple. Use Value: Wide 3.5–36-V input range eliminates need for upstream pre-regulators; auto mode sustains >85% efficiency down to 10 mA load. | Use Scenario: Supplying analog front-ends, ADC/DAC references, and FPGA core voltages in portable multimeters and oscilloscope channels. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 1.2-V or 1.8-V supply with precise enable and power-good signaling for controlled power sequencing. Use Value: 15-µA quiescent current preserves battery life; PGOOD flag enables firmware-controlled power-up validation before measurement sampling. |
| General-Purpose Wide VIN Systems | Automotive Body Electronics |
Use Scenario: Providing stable 5-V USB power and 3.3-V MCU rails in edge computing gateways operating from unregulated 12-V or 24-V vehicle or PoE-derived supplies. IC Role / Device Role / Timing Role: Main buck converter with programmable frequency (500 kHz–2.2 MHz) to avoid AM band interference and meet EMI Class B limits. Use Value: 60-ns minimum on-time supports 24-V→3.3-V conversion without pulse-skipping; wettable flanks aid AOI in high-volume assembly. | Use Scenario: Powering infotainment display controllers and ADAS camera modules in 12-V automotive subsystems with cold-crank tolerance. IC Role / Device Role / Timing Role: Input-UVLO-programmable buck regulator that remains functional down to 3.5 V input and recovers cleanly after cranking dips. Use Value: Precision enable (1.14–1.25 V threshold) allows custom UVLO hysteresis via resistor divider; thermal shutdown prevents latch-up during under-hood overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM73606RNPT | Same pinout, 6-A rating, higher HS/LS current limits (8.7 A/6.6 A), identical features and package | Used where 6-A output headroom or higher peak current margin is required; shares same PCB layout | Select LM73606RNPT when future-proofing for higher load or transient current demands without redesign |
| LM61460RQWR | 60-V max input, lower IQ (1.5 µA shutdown), improved EMI via spread-spectrum, different pinout and package (16-pin QFN) | Targeted at higher-input industrial or automotive applications requiring enhanced noise immunity and wider VIN range | Choose LM61460RQWR for new designs needing >36-V input, ultra-low standby power, or stricter CISPR-25 compliance |
Compared with LM73606RNPT, LM73605RNPT offers tighter current-limit thresholds and lower conduction loss at 5-A loads; compared with LM61460RQWR, it provides pin compatibility with existing LM736xx layouts but lacks spread-spectrum EMI reduction and 60-V rating.
Availability
LM73605RNPT 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 LM73605RNPT 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 technologies, with decades of expertise in high-reliability DC/DC conversion.
The LM7360x product line was designed for compact, efficient point-of-load regulation in industrial, test equipment, and automotive applications-emphasizing wide input range, low quiescent current, and robust thermal performance in leadless packages.
FAQ
What is the maximum input voltage rating for LM73605RNPT?
The absolute maximum input voltage (PVIN to PGND) for LM73605RNPT is 42 V, but the recommended operating range is 3.5 V to 36 V. Operation above 36 V risks exceeding safe junction temperature or violating recommended conditions, even if within absolute max ratings. TI specifies 36 V as the upper limit for guaranteed performance and reliability across –40°C to +125°C.
Does LM73605RNPT support output voltage tracking?
Yes, LM73605RNPT supports output voltage tracking via the SS/TRK pin. When an external ramp voltage is applied to this pin, the FB node follows it during startup, enabling coordinated sequencing of multiple rails. This feature is confirmed in the datasheet's "Flexible soft-start features" list and functional description, and applies directly to the LM73605RNPT variant.
What is the thermal resistance (RθJA) of LM73605RNPT in its standard PCB layout?
The junction-to-ambient thermal resistance (RθJA) for LM73605RNPT in the standard JEDEC High-K board layout is 34.3°C/W. This value assumes the exposed thermal pad (DAP) is fully soldered to a 2-layer 2-oz copper board with thermal vias, as specified in the Thermal Information table. Layout deviations will alter actual thermal performance.
Can LM73605RNPT operate with a 3.3-V output and 24-V input?
Yes, LM73605RNPT can regulate 3.3 V from a 24-V input. Its 60-ns minimum on-time and 97.5% maximum duty cycle enable high step-down ratios. At 24 V → 3.3 V with 500-kHz switching, the calculated duty cycle is ~13.8%, well within operational range. Efficiency remains >88% at 5 A per typical curves in the datasheet.
Is LM73605RNPT pin-compatible with LM73606RNPT?
Yes, LM73605RNPT is pin-to-pin compatible with LM73606RNPT. Both use the identical 30-pin WQFN (RNP) package, share identical pin functions and layout requirements, and differ only in current rating (5 A vs. 6 A) and corresponding current-limit thresholds. This allows direct replacement or scalable design reuse without PCB changes.
LM73605RNPT 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)
LM73605RNPT FAQ
1.How can I place an order for LM73605RNPT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM73605RNPT 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 LM73605RNPT reliable?
The price and inventory of LM73605RNPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM73605RNPT is usually 5 days.
3.What payment methods are accepted for LM73605RNPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM73605RNPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM73605RNPT?
LM73605RNPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM73605RNPT 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 LM73605RNPT?
For technical support, including LM73605RNPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM73605RNPT requirements.
6.How does Aetrix verify that LM73605RNPT is sourced from the original manufacturer or authorized distributors?
All LM73605RNPT 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 LM73605RNPT meets industry standards.
7.What is the process for return or replacement of LM73605RNPT?
All LM73605RNPT units undergo pre-shipment inspection (PSI). If there is an issue with LM73605RNPT, 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 LM73605RNPT part is unused and in its original packaging.
Return procedure for LM73605RNPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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