Texas Instruments LM5165YDRCR

Overview

LM5165YDRCR from Texas Instruments is a 3-V to 65-V input, 150-mA synchronous buck converter with ultra-low 10.5-µA no-load quiescent current, integrated 2-Ω PMOS high-side and 1-Ω NMOS low-side switches, and fixed 3.3-V output in a thermally enhanced 10-pin VSON package. It delivers regulated bias power for industrial sensors and automotive modules operating across wide input transients.

For engineers reviewing the LM5165YDRCR datasheet, LM5165YDRCR pinout, LM5165YDRCR application, or LM5165YDRCR equivalent, this device supports PFM/COT mode selection, programmable current limit (4 levels), monotonic start-up into prebiased outputs, active slew rate control for EMI reduction, and EN/UVLO with adjustable hysteresis - all without loop compensation.

Technical Context

The LM5165YDRCR implements a constant-on-time (COT) or pulse-frequency-modulation (PFM) control architecture with no external loop compensation required. Its integrated high-side PMOS enables true 100% duty cycle operation for ultra-low dropout, while the NMOS synchronous rectifier eliminates external diode losses.

Control is configured via RT (mode selection/on-time programming), ILIM (four-level peak current limit), SS (900-µs internal or capacitor-programmable soft-start), and HYS (UVLO hysteresis setting). The 1.223-V ±1% internal reference feeds the FB comparator, and PGOOD provides open-drain power-good signaling with 94%/87% rising/falling thresholds relative to VREF.

Key Specifications

Pinout & Package

LM5165YDRCR uses a 10-pin, 3-mm × 3-mm VSON package with exposed thermal pad (DRC suffix), optimized for high-power-density PCB layouts and thermal performance (R_θJB = 22.1°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5165DRCR and LM5166YDRCR, LM5165YDRCR uniquely combines fixed 3.3-V output, 150°C junction rating, and 10.5-µA IQ in a single 3-mm × 3-mm VSON package - making it optimal for space- and thermal-constrained 4–20 mA and automotive body electronics.

Availability

LM5165YDRCR is available at Aetrix Electronics and suitable for 4–20 mA loop-powered sensors, automotive body electronics, and industrial control I/O modules requiring stable component supply with long lifecycle assurance.

Supply support for LM5165YDRCR 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 power conversion.

The LM5165 product line delivers ultra-wide-input, ultra-low-IQ synchronous buck converters for harsh-environment applications including industrial automation, automotive subsystems, and battery-powered instrumentation.

FAQ

What is the output voltage tolerance of the LM5165YDRCR?

The LM5165YDRCR provides a fixed 3.3-V output with guaranteed tolerance of ±2.1% (3.23 V to 3.37 V) over temperature and line, based on its internal 1.223-V ±1% reference and trimmed feedback divider. This specification holds across the full –40°C to 150°C junction temperature range and 3-V to 65-V input voltage range, ensuring reliable logic-level compatibility in demanding environments.

Does the LM5165YDRCR require external compensation components?

No, the LM5165YDRCR does not require external compensation components. Its constant-on-time (COT) and pulse-frequency-modulation (PFM) control architectures are inherently stable across input voltage and load variations. This eliminates the need for compensation capacitors or resistors - simplifying design, reducing BOM count, and minimizing PCB area compared to traditional voltage-mode or current-mode controllers.

How is the current limit configured on the LM5165YDRCR?

The LM5165YDRCR current limit is configured using the ILIM pin: connecting a resistor from ILIM to GND selects one of four preset peak current thresholds (48 mA, 120 mA, 180 mA, or 240 mA), while shorting ILIM to GND enables the maximum 240-mA setting. These values are validated across temperature and input voltage, allowing precise inductor sizing for target output current and ripple requirements in the final LM5165YDRCR design.

Can the LM5165YDRCR operate with 100% duty cycle?

Yes, the LM5165YDRCR supports true 100% duty cycle operation due to its integrated high-side PMOS switch, which eliminates the need for a bootstrap capacitor. This enables ultra-low dropout performance - maintaining regulation even when input voltage approaches the 3.3-V output level - a critical capability for cold-crank scenarios in automotive applications and brownout conditions in industrial systems using the LM5165YDRCR.

What thermal performance can be expected from the LM5165YDRCR in a standard PCB layout?

In a standard 4-layer PCB with 2 oz copper and the exposed thermal pad fully soldered to an internal ground plane, the LM5165YDRCR achieves a junction-to-board thermal resistance (R_θJB) of 22.1°C/W. At 150 mA output and 12-V input, typical power dissipation is ~180 mW, resulting in ~4°C junction-to-board temperature rise - well within the –40°C to 150°C operating range and confirming robust thermal headroom for continuous operation in the LM5165YDRCR application.