Texas Instruments LMR36501P5RPER

Overview

LMR36501P5RPER from Texas Instruments is a 3-V to 65-V, 100-mA synchronous buck DC/DC converter in a 2-mm × 2-mm HotRod™ VQFN-HR (RPE) package, delivering fixed 5-V output with ±1.5% accuracy in FPWM mode, 80%+ peak efficiency at 1 MHz, and operation across –40°C to +150°C junction temperature - deployed in field transmitters and HVAC sensors where compact size and input transient resilience are critical.

For engineers reviewing the LMR36501P5RPER datasheet, LMR36501P5RPER pinout, LMR36501P5RPER application, or LMR36501P5RPER equivalent, key selection considerations include its 70-V input transient rating, RT-pin programmable 200 kHz–2.2 MHz switching frequency, PGOOD flag with glitch filtering, precision EN/UVLO thresholds (1.16–1.36 V enable high), and internal compensation eliminating external loop components.

Technical Context

The LMR36501P5RPER uses peak current mode control with internal compensation, enabling stable regulation with minimal output capacitance and eliminating external compensation networks. Its architecture supports automatic frequency foldback during input transients or dropout, maintaining regulation down to 3.0-V falling input threshold while sustaining <5-µA quiescent current in PFM light-load mode.

It integrates a high-side MOSFET (2.2 Ω R_DS(on)) and low-side MOSFET (1 Ω R_DS(on)), precision reference (0.985–1.01 V), thermal shutdown (158–180°C), and a dedicated PGOOD output with 1.7–2.16 ms activation delay and built-in 15–40 µs glitch filter - all optimized for rugged industrial power rails requiring EMI robustness and long-term reliability.

Key Specifications

Pinout & Package

VQFN-HR (RPE) package: 2.0 mm × 2.0 mm body, 9-pin layout with wettable flanks and corner anchor pads for enhanced manufacturability and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMR36501P5RPER, LMR36501P3RPER delivers lower output voltage for 3.3-V systems without redesign, while LMR36502P5RPER provides 50% more current headroom within identical footprint - both retain full functional compatibility including PGOOD timing, EN thresholds, and RT-programmable frequency range.

Availability

LMR36501P5RPER is available at Aetrix Electronics and suitable for factory automation sensors, building HVAC controllers, and portable power tools requiring stable component supply, long-lifecycle assurance, and automotive-grade reliability without qualification overhead.

Supply support for LMR36501P5RPER 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 industrial-grade product validation and broad distribution infrastructure.

The LMR3650x product line was designed specifically for space-constrained, high-reliability industrial power rails - emphasizing ultra-small HotRod™ packaging, wide-input resilience, and simplified design through internal compensation and integrated PGOOD.

FAQ

What is the maximum input voltage transient the LMR36501P5RPER can survive without damage?

The LMR36501P5RPER is rated to withstand input voltage transients up to 70 V without damage or functional interruption. This is validated per absolute maximum ratings (Section 7.1), where VIN to GND is specified from –0.3 V to +70 V. The device continues regulating during such transients due to automatic frequency foldback and robust internal FETs - making it suitable for 24-V and 48-V industrial buses exposed to load dump or inductive kickback.

Does the LMR36501P5RPER require external compensation components?

No, the LMR36501P5RPER does not require external compensation components. It uses an internally compensated peak current mode control architecture optimized for stability with minimal output capacitance. This eliminates the need for external Type II or Type III compensation networks, reducing BOM count, PCB area, and design validation effort - a key differentiator versus traditional buck controllers requiring manual loop tuning.

What is the typical quiescent current of the LMR36501P5RPER at no load?

The typical quiescent current of the LMR36501P5RPER is 4 µA when operating at VIN = 24 V, VOUT = 5 V, IOUT = 0 A, and in PFM mode (Section 7.6). At VIN = 13.5 V under identical conditions, it draws 6.5 µA. These ultra-low values enable multi-year battery life in always-on industrial sensors and IoT edge nodes powered by primary lithium cells or energy harvesters.

Can the LMR36501P5RPER be synchronized to an external clock?

No, the LMR36501P5RPER does not support external clock synchronization. It is an RT-pin programmable variant only - frequency is set via a resistor from RT to GND, covering 200 kHz to 2.2 MHz. For external sync capability, TI offers the MODE/SYNC variants (e.g., LMR36502PS5RPER), which accept an external clock signal on the MODE/SYNC pin. The LMR36501P5RPER lacks this pin and associated circuitry.

What is the purpose of the PGOOD pin on the LMR36501P5RPER, and how is it implemented?

The PGOOD pin on the LMR36501P5RPER is an open-drain power-good flag that signals valid regulation with built-in glitch filtering and delayed release. It asserts high after a 1.7–2.16 ms delay once output reaches 90% of target (Section 7.5), includes a 15–40 µs glitch filter to reject noise-induced false triggers, and deasserts immediately upon EN low or output fault. This eliminates the need for external voltage supervisors in most industrial applications, reducing system cost and complexity.