Texas Instruments LM5165XDRCR

Overview

LM5165XDRCR 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 5-V output in a thermally enhanced 3-mm × 3-mm VSON-10 package. It delivers regulated bias power for industrial sensors and automotive modules operating across wide input transients.

For engineers reviewing the LM5165XDRCR datasheet, LM5165XDRCR pinout, LM5165XDRCR application, or LM5165XDRCR equivalent, this page provides verified technical context, validated pin functions, confirmed EMI compliance (EN55022/CISPR 22), real-world efficiency curves at 5 V/150 mA, and precise soft-start and current-limit configuration details.

Technical Context

The LM5165XDRCR implements Constant On-Time (COT) or Pulse Frequency Modulation (PFM) control without loop compensation, using an internal 1.223-V ±1% reference and adaptive dead-time for synchronous rectification. Its high-side PMOS supports true 100% duty cycle operation, eliminating bootstrap capacitor requirements and enabling ultra-low dropout under high VIN-to-VOUT ratios.

Current limit is programmable across four discrete levels (48–264 mA) via resistor on ILIM, while soft-start timing is selectable as disabled (SS shorted), fixed 900 µs (SS floating), or externally programmable (capacitor on SS). PGOOD provides open-drain fault reporting with 7% hysteresis relative to FB threshold.

Key Specifications

Pinout & Package

LM5165XDRCR uses a 10-pin, 3-mm × 3-mm VSON package with exposed thermal pad (DRC suffix), optimized for high-power-density layouts and efficient PCB heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5165XDRCR, LM5166XDRCT offers deeper sleep current and broader temperature support but omits formal EMI validation, while TPS63060DSCR provides buck-boost flexibility at the cost of voltage range and quiescent performance - making LM5165XDRCR optimal for fixed 5-V, high-input-voltage, EMI-sensitive industrial applications.

Availability

LM5165XDRCR is available at Aetrix Electronics and suitable for 4–20 mA loop-powered sensors, automotive body control modules, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LM5165XDRCR 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 and embedded processing technologies, with decades of expertise in power management ICs for industrial, automotive, and communications markets.

The LM5165 family was designed specifically for high-input-voltage, ultra-low-IQ DC-DC conversion in space-constrained, thermally demanding environments - targeting industrial sensors, automotive subsystems, and distributed control systems.

FAQ

What is the maximum continuous output current of the LM5165XDRCR?

The LM5165XDRCR delivers up to 150 mA of continuous output current in Constant On-Time (COT) mode at 5 V output, as validated across the full –40°C to 150°C junction temperature range with proper PCB thermal design. In Pulse Frequency Modulation (PFM) mode, the rated output is 100 mA due to reduced switching activity at light loads. The actual achievable current depends on input voltage, ambient temperature, and heatsinking - with thermal shutdown activating at 170°C junction temperature.

Does the LM5165XDRCR require external compensation components?

No, the LM5165XDRCR does not require external loop compensation components in either PFM or COT operating modes. Its control architecture is inherently stable due to the internal 1.223-V reference, predictive on-time generation, and zero-crossing detection - eliminating the need for compensation capacitors or resistors and reducing total solution size by up to 30% compared to traditional voltage-mode buck controllers.

How is the current limit configured on the LM5165XDRCR?

The LM5165XDRCR current limit is configured via a resistor connected between the ILIM pin and GND, selecting one of four factory-calibrated peak current thresholds: 48 mA (R ≥ 100 kΩ), 100 mA (R = 56.2 kΩ), 155 mA (R = 24.9 kΩ), or 220 mA (ILIM shorted to GND). This allows precise inductor sizing for target output current and transient response - for example, a 24.9-kΩ resistor enables full 150-mA operation in COT mode with margin.

Can the LM5165XDRCR operate with 100% duty cycle?

Yes, the LM5165XDRCR supports true 100% duty cycle operation using its integrated high-side PMOS switch, enabling minimum dropout voltage (typically <100 mV at 150 mA) and uninterrupted regulation during low-VIN conditions - such as 5.5-V input to 5-V output. This eliminates the need for a bootstrap capacitor and simplifies design versus NMOS-based controllers that require auxiliary charge-pump circuitry.

What package type and thermal characteristics does the LM5165XDRCR use?

The LM5165XDRCR uses the DRC package: a 10-pin, 3-mm × 3-mm VSON with exposed thermal pad. Its thermal resistance is characterized as R_θJA = 47.7°C/W (junction-to-ambient, standard JEDEC 2S2P board) and R_θJB = 22.1°C/W (junction-to-board), enabling reliable 150-mA operation at 85°C ambient when the thermal pad is soldered to a ≥100-mm² copper pour. The exposed pad must be electrically and thermally connected to GND.