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Texas Instruments LM73606RNPT
- Part No.:
- LM73606RNPT
- Manufacturer:
- Texas Instruments
- Package:
- 30-WFQFN Exposed Pad
- Datasheet:
-
LM73606RNPT.pdf
- Description:
- IC REG BUCK ADJ 6A 30WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,420
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Product details
Overview
LM73606RNPT from Texas Instruments is a 3.5-V to 36-V, 6-A synchronous step-down DC/DC converter in a 30-pin WQFN package with wettable flanks. It delivers up to 6 A continuous output current, features peak current-mode control, 53 mΩ high-side and 31 mΩ low-side MOSFETs, and supports adjustable switching frequency from 350 kHz to 2.2 MHz. It is used in industrial distributed power supplies requiring high efficiency across wide input voltage ranges.
For engineers reviewing the LM73606RNPT datasheet, LM73606RNPT pinout, LM73606RNPT application, or LM73606RNPT equivalent, key selection considerations include its 6-A load capability, auto/FPWM mode selection via SYNC/MODE pin, precision enable for programmable UVLO, internal compensation, and PGOOD flag for system monitoring.
Technical Context
The LM73606RNPT employs fixed-frequency peak current-mode control with configurable operation modes: auto mode (diode emulation at light loads) and forced PWM (constant frequency across full load range). Its minimum on-time of 60 ns and off-time of 70 ns enable high VIN/VOUT ratios, including 36 V input to 1 V output.
It integrates both high-side and low-side MOSFETs with RDS_ON_HS = 53 mΩ and RDS_ON_LS = 31 mΩ (typical), uses internal compensation to reduce external components, and supports synchronization to an external clock or resistor-programmed frequency via RT pin - enabling optimization for EMI, thermal performance, or solution size.
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 | 6 A continuous - enables single-chip replacement of dual-phase controllers in space-constrained designs |
| Switching Frequency | 350 kHz to 2.2 MHz - selectable via RT resistor or external sync clock for EMI compliance and layout optimization |
| Quiescent Current | 15 µA in active no-load mode - extends battery life in always-on systems |
| MOSFET RDS(on) | HS: 53 mΩ, LS: 31 mΩ - reduces conduction loss, especially critical at low VOUT (e.g., 3.3 V, 1.2 V) |
| Power-Good Flag | Open-drain PGOOD with 86–93% UV and 106–113% OV thresholds - enables reliable system sequencing and fault detection |
| Soft-Start | Adjustable via SS/TRK pin (2 µA charge current) - supports pre-biased start-up and voltage tracking for multi-rail systems |
Pinout & Package
LM73606RNPT is housed in 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 thermal dissipation (RθJB = 7.3 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–5, 22, 26 | SW | Switch node connecting integrated HS/LS FETs to inductor and CBOOT - requires low-inductance layout for EMI and efficiency |
| 6 | CBOOT | Bootstrap capacitor connection for HS gate driver - must use 470-nF ceramic capacitor tied directly to SW |
| 7 | VCC | Internal LDO output powering control circuitry - requires 2.2-µF bypass 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 |
| 9 | RT | Frequency setting input - resistor to AGND sets fSW; open-circuit defaults to ~500 kHz |
| 10 | SS/TRK | Soft-start and tracking control - 2-µA current source charges external capacitor; also accepts external ramp for sequencing |
| 11 | FB | Feedback input for output regulation - connects to resistor divider; VFB = 1.006 V (typ) sets VOUT = FB × (1 + RFBT/RFBB) |
| 16 | PGOOD | Open-drain power-good flag - asserts high when VOUT is within ±10% of target; requires pull-up resistor |
| 17 | SYNC/MODE | Mode selection and sync input - ground = auto mode, logic high = FPWM, external clock = synchronized FPWM |
| 18 | EN | Enable with precision UVLO - rising threshold 1.14–1.25 V; allows programmable input undervoltage lockout via resistor divider |
| 19 | AGND | Analog ground reference - star-point for FB, RT, SS/TRK; separate from PGND to minimize noise coupling |
| 20–21 | PVIN | Power input to internal bias LDO and HS FET - connects to main input rail and CIN; requires short, wide traces |
| 23–25 | PGND | Power ground - internal connection to LS FET source; must be low-impedance path to DAP and CIN/COUT grounds |
| EP/DAP | Thermal Pad | Exposed pad tied to AGND/PGND - primary heat dissipation path; requires ≥9 thermal vias to inner ground planes |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated 53 mΩ HS / 31 mΩ LS MOSFETs eliminate external diode losses and improve full-load efficiency by >3% vs. non-synchronous designs |
| Auto mode operation | Diode-emulation at light loads reduces switching losses; achieves <15 µA quiescent current and >90% efficiency at 10 mA output |
| Flexible soft-start | Configurable start-up into pre-biased loads, adjustable timing (via SS/TRK cap), and output voltage tracking for multi-rail sequencing |
| Robust protection suite | Cycle-by-cycle current limiting, hiccup-mode short-circuit response, thermal shutdown (160°C), and precise UVLO prevent system faults |
| Wettable flanks package | 30-pin WQFN with side-wettable leads enables automated optical inspection (AOI) of solder joints for high-reliability manufacturing |
Applications
| Industrial Distributed Power | Test & Measurement Equipment |
|---|---|
Use Scenario: 24-V factory floor bus powering multiple isolated 5-V/3.3-V rails for PLC I/O modules and sensors. IC Role / Device Role / Timing Role: Primary buck regulator delivering 6-A 5-V output; operates in auto mode to maintain >85% efficiency at partial loads during idle cycles. Use Value: Eliminates need for discrete MOSFETs and external compensation, reducing BOM count by 7 parts and PCB area by 35% vs. controller+MOSFET solution. | Use Scenario: Portable oscilloscope requiring ultra-low-noise 1.2-V core supply from 12-V battery with strict EMI limits. IC Role / Device Role / Timing Role: Synchronous buck generating clean 1.2-V rail; configured in FPWM mode with 1.8-MHz switching to move noise above sensitive analog bands. Use Value: Internal compensation and optimized layout reduce output ripple to <5 mVpp, meeting EN55022 Class B conducted EMI requirements without added filtering. |
| Automotive Body Control Module | General-Purpose Wide VIN Systems |
Use Scenario: BCM supplying 3.3-V microcontroller and CAN transceiver from 9–16-V battery with cold-crank tolerance down to 3.5 V. IC Role / Device Role / Timing Role: Input-stage buck converter; uses precision enable (VEN_VOUT_H = 1.14–1.25 V) to hold off startup until battery recovers above 6 V. Use Value: 3.5-V minimum input and 60-ns tON-MIN ensure regulation during cold-crank dips; PGOOD enables safe MCU reset sequencing. | Use Scenario: Field-deployable IoT gateway converting unregulated 12–36-V PoE++ or solar input to stable 5-V USB-C power. IC Role / Device Role / Timing Role: Main DC/DC stage supporting 6-A peak load for cellular modem bursts; uses BIAS pin tied to VOUT to sustain >92% efficiency at 36-V input. Use Value: Adjustable frequency (350 kHz–2.2 MHz) allows trade-off between inductor size (high-freq) and efficiency (low-freq) based on thermal constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM73605RNPT | Same pinout and feature set, but rated for 5-A max output current; lower RDS_ON_HS (53 mΩ) and RDS_ON_LS (31 mΩ) identical | Used where 5-A output suffices; slightly lower thermal stress at same load due to identical MOSFETs but lower current rating | Select LM73605RNPT when design load ≤5 A and board layout reuse is prioritized over headroom |
| LM61460RQWR | 60-V max input, 6-A output, lower IQ (1.5 µA shutdown), improved EMI via spread-spectrum and quieter gate drive | Better suited for 48-V industrial or HEV systems; lacks wettable flanks and has different pinout (no BIAS pin) | Choose LM61460RQWR for higher input voltage (>36 V), stricter EMI requirements, or lower standby power - but expect PCB redesign |
Compared with LM73605RNPT, LM73606RNPT provides 20% higher output current headroom in identical footprint; versus LM61460RQWR, it offers wettable flanks for AOI and BIAS pin flexibility at the cost of 24-V input limit and higher quiescent current.
Availability
LM73606RNPT is available at Aetrix Electronics and suitable for industrial distributed power, test and measurement equipment, and general-purpose wide VIN applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM73606RNPT 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 company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and system solutions for industrial, automotive, and personal electronics markets.
The LM73606RNPT belongs to TI's high-performance synchronous buck converter product line, engineered for compact, efficient, and easy-to-design DC/DC solutions in wide-input-voltage industrial and embedded systems.
FAQ
What is the maximum input voltage rating for LM73606RNPT?
The LM73606RNPT has an absolute maximum input voltage rating of 42 V on the PVIN pins, but its recommended operating input voltage range is 3.5 V to 36 V. Operation above 36 V risks exceeding electrical specifications and thermal limits, even if below the 42-V absolute maximum. Always refer to the Recommended Operating Conditions table in the official LM73606RNPT datasheet for validated performance boundaries.
Does LM73606RNPT support output voltage tracking?
Yes, LM73606RNPT 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 it, enabling coordinated power-up sequencing of multiple rails. This functionality is explicitly documented in the LM73606RNPT datasheet Section 7.3.2 and Figure 11, and requires no additional ICs or complex circuitry.
Can LM73606RNPT operate with a pre-biased output?
Yes, LM73606RNPT supports start-up into a pre-biased output. Its internal control architecture prevents reverse current flow during initial turn-on, avoiding output voltage collapse or damage to downstream circuitry. This behavior is confirmed in the LM73606RNPT datasheet Section 7.3.2 and is enabled by default - no external components or configuration are required.
What is the purpose of the BIAS pin on LM73606RNPT?
The BIAS pin on LM73606RNPT provides an optional external supply input for the internal gate drivers, improving conversion efficiency - especially at high input voltages. When VOUT is between 3.3 V and 18 V, TI recommends tying BIAS to VOUT; otherwise, connect to a clean 3.3-V or 5-V rail. The LM73606RNPT datasheet specifies that BIAS voltage must never exceed VIN, and grounding it disables the feature.
Is LM73606RNPT pin-compatible with LM73605RNPT?
Yes, LM73606RNPT is pin-to-pin compatible with LM73605RNPT. Both devices share identical 30-pin WQFN (RNP) packaging, identical pin functions, and identical PCB footprint. This allows direct substitution in existing designs when higher output current (6 A vs. 5 A) is required, provided thermal management and output capacitor ratings are verified for the increased load.
LM73606RNPT 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 30-WQFN (6x4)
LM73606RNPT FAQ
1.How can I place an order for LM73606RNPT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM73606RNPT 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 LM73606RNPT reliable?
The price and inventory of LM73606RNPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM73606RNPT is usually 5 days.
3.What payment methods are accepted for LM73606RNPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM73606RNPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM73606RNPT?
LM73606RNPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM73606RNPT 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 LM73606RNPT?
For technical support, including LM73606RNPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM73606RNPT requirements.
6.How does Aetrix verify that LM73606RNPT is sourced from the original manufacturer or authorized distributors?
All LM73606RNPT 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 LM73606RNPT meets industry standards.
7.What is the process for return or replacement of LM73606RNPT?
All LM73606RNPT units undergo pre-shipment inspection (PSI). If there is an issue with LM73606RNPT, 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 LM73606RNPT part is unused and in its original packaging.
Return procedure for LM73606RNPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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