Texas Instruments LM73606RNPR

Overview

LM73606RNPR from Texas Instruments is a 3.5-V to 36-V, 6-A synchronous step-down DC/DC converter with peak current-mode control, 53 mΩ high-side and 31 mΩ low-side MOSFETs, and 60 ns minimum on-time - enabling high-efficiency 5 V or 3.3 V conversion in industrial power supplies and test equipment.

For engineers reviewing the LM73606RNPR datasheet, LM73606RNPR pinout, LM73606RNPR application, or LM73606RNPR equivalent, key selection factors include its wettable-flank WQFN-30 package, auto/FPWM mode selectability, 350 kHz–2.2 MHz adjustable switching frequency, precision enable for UVLO programming, and integrated power-good flag with 1.006 V feedback reference.

Technical Context

The LM73606RNPR employs fixed-frequency peak current-mode control with internal compensation and automated frequency foldback at extreme duty cycles. It supports both auto mode (diode emulation at light loads) and forced PWM (constant frequency across full load range), selected via SYNC/MODE pin logic level.

Its dual MOSFET integration enables cycle-by-cycle peak and valley current limiting, hiccup-mode short-circuit protection, and pre-biased soft-start. The BIAS pin accepts external 3.3 V or 5 V supply to reduce quiescent current and improve efficiency when VOUT is ≥3.3 V.

Key Specifications

Pinout & Package

LM73606RNPR is housed in a 30-pin Wettable Flanks QFN (WQFN-RNP) package measuring 6.00 mm × 4.00 mm × 0.8 mm, with exposed thermal pad (DAP) soldered to PCB ground for optimal thermal performance (R_θJB = 7.3°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with LM73605RNPR, LM73606RNPR provides 20% higher output current in identical footprint and thermal interface; versus LM61460RQWR, it offers proven 36 V operation with simpler layout but lacks spread-spectrum EMI reduction and 60 V rating.

Availability

LM73606RNPR is available at Aetrix Electronics and suitable for industrial distributed power, test and measurement equipment, and automotive body control modules requiring stable component supply with full production lifecycle support.

Supply support for LM73606RNPR 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 over 90 years of innovation in high-reliability electronics.

The LM73606RNPR belongs to TI's high-performance synchronous buck converter product line, designed specifically for compact, efficient, and robust DC/DC conversion in industrial, test, and automotive applications demanding wide input range and precise regulation.

FAQ

What is the maximum input voltage rating for the LM73606RNPR?

The LM73606RNPR 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. Exceeding 36 V continuously may trigger overvoltage protection or reduce long-term reliability; transient spikes up to 42 V are tolerated per absolute maximum ratings, but system design should limit exposure duration.

Does the LM73606RNPR support output voltage tracking?

Yes, the LM73606RNPR supports output voltage tracking via the SS/TRK pin. By connecting this pin to an external voltage ramp (e.g., from another regulator's soft-start node), the LM73606RNPR's output follows that ramp with matched slew rate - enabling controlled power sequencing in multi-rail systems without additional circuitry.

How does the BIAS pin improve efficiency in the LM73606RNPR?

The BIAS pin on the LM73606RNPR allows connection to an external 3.3 V or 5 V supply (or to VOUT if 3.3 V ≤ VOUT ≤ 18 V), reducing internal LDO loading and cutting operating quiescent current by up to 50%. This directly increases light-load efficiency - especially valuable in battery-powered instrumentation where standby current dominates lifetime energy use.

Can the LM73606RNPR start up into a pre-biased output?

Yes, the LM73606RNPR supports safe startup into a pre-biased output. Its internal control architecture prevents reverse current flow during soft-start by disabling the low-side MOSFET until the internal reference ramps - making it suitable for hot-swap applications, redundant power systems, and FPGA/ASIC power sequencing where output capacitors may retain charge.

What thermal performance can be expected from the LM73606RNPR in a standard 4-layer PCB layout?

In a standard 4-layer PCB with 2 oz copper, thermal vias under the DAP, and 200 mm² of 1 oz ground copper connected to the exposed pad, the LM73606RNPR achieves R_θJB ≈ 7.3°C/W. At 6 A output with 12 V_IN/5 V_OUT, this yields ~35°C junction-to-board rise - keeping T_J well below 125°C derating limits under typical ambient conditions.