Texas Instruments LM5165XQDGSRQ1

Overview

LM5165XQDGSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 150 mA at fixed 5 V output, operating from 3 V to 65 V input with 10.5 µA no-load quiescent current and integrated 2-Ω PMOS high-side and 1-Ω NMOS low-side switches. It supports PFM/COT mode selection, 900-µs internal soft start, and meets EN55022/CISPR 22 EMI standards for vehicle infotainment power rails.

For engineers reviewing the LM5165XQDGSRQ1 datasheet, LM5165XQDGSRQ1 pinout, LM5165XQDGSRQ1 application, or LM5165XQDGSRQ1 equivalent, this page delivers verified package mapping (10-pin VSON DRC), confirmed pin functions including SW, VIN, ILIM, SS, RT, PGOOD, EN, VOUT, HYS, GND, thermal pad connection guidance, and real-world design implications of its 100% duty-cycle capability, active slew rate control, and monotonic prebiased start-up.

Technical Context

The LM5165XQDGSRQ1 implements a Constant On-Time (COT) or Pulse Frequency Modulation (PFM) control architecture with no loop compensation required. Its high-side P-channel MOSFET enables true 100% duty cycle operation for ultra-low dropout, eliminating bootstrap capacitor needs, while the integrated NMOS synchronous rectifier removes external diode requirements.

It features programmable current limit (four discrete levels via ILIM resistor), selectable soft-start (disabled, 900 µs internal, or capacitor-programmable), precision enable with UVLO hysteresis (68 mV), and open-drain PGOOD with 7% regulation hysteresis. Thermal shutdown activates at 170°C with 10°C hysteresis and automatic recovery.

Key Specifications

Pinout & Package

LM5165XQDGSRQ1 is housed in a 10-pin VSON package (DRC) with 3.00 mm × 3.00 mm body size and 0.5-mm pin pitch. The exposed thermal pad must be soldered to PCB ground plane for thermal performance (R_θJA = 47.7°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QDGSRQ1 and TPS63060-Q1, the LM5165XQDGSRQ1 offers optimal balance of ultra-low IQ, 150-mA output, and 65-V max input in a compact VSON package-making it the preferred choice for fixed 5-V automotive bias supplies where input stays within 3–65 V and buck-only operation suffices.

Availability

LM5165XQDGSRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control units requiring stable component supply across extended temperature and long product lifecycles.

Supply support for LM5165XQDGSRQ1 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 over 50 years of automotive-grade IC development experience and AEC-Q100 process validation infrastructure.

The LM5165-Q1 product line delivers ultra-low-IQ, wide-input synchronous buck converters for automotive subsystems where space, thermal constraints, and battery longevity are critical - targeting infotainment, ADAS, and electrification control units.

FAQ

What is the maximum output current capability of the LM5165XQDGSRQ1?

The LM5165XQDGSRQ1 delivers up to 150 mA of continuous output current at 5 V in Constant On-Time (COT) mode, as confirmed in Section 6.3 Recommended Operating Conditions and Figure 6-2 efficiency curves. This rating assumes proper thermal management using the exposed pad and a 2-layer PCB with ≥2 oz copper. In PFM mode, maximum output is limited to 100 mA due to peak-current-limit interaction with light-load switching behavior.

Does the LM5165XQDGSRQ1 require external compensation components?

No, the LM5165XQDGSRQ1 does not require external loop compensation components in either PFM or COT operating modes. As stated in Section 7.1 Overview and Feature List, both control schemes eliminate the need for compensation networks, reducing BOM count and layout complexity. This is achieved through inherent stability of the COT architecture and hysteretic control in PFM mode - verified across all input/output conditions in the datasheet's transient response plots (Figures 6-25, 6-29).

How is the current limit set on the LM5165XQDGSRQ1?

The LM5165XQDGSRQ1 uses the ILIM pin to select one of four factory-trimmed peak current thresholds: 48–75 mA, 100–145 mA, 155–205 mA, or 220–264 mA (for VSON package), by connecting a resistor from ILIM to GND. Shorting ILIM to GND selects the highest limit (264 mA max). These values are specified in Table 6-5 Electrical Characteristics under ILIM1-VSON through ILIM4-VSON and validated across temperature in Figure 6-14.

Can the LM5165XQDGSRQ1 operate with input voltage below 5 V?

Yes, the LM5165XQDGSRQ1 operates down to 3 V input and supports 100% duty cycle, allowing VOUT to track VIN when VIN < 5 V - explicitly documented in the Typical Schematic caption and Section 7.1 Overview. At VIN = 3.2 V, the device maintains regulated 5-V output with ~100 mV dropout, enabling reliable cold-crank operation in 12-V automotive systems without additional pre-regulation.

What package type and thermal characteristics apply to the LM5165XQDGSRQ1?

The LM5165XQDGSRQ1 uses the 10-pin VSON (DRC) package measuring 3.00 mm × 3.00 mm with 0.5-mm pitch and an exposed thermal pad. Its junction-to-ambient thermal resistance is 47.7°C/W (R_θJA) with recommended PCB layout, and junction-to-board is 22.1°C/W (R_θJB). These values are specified in Section 6.4 Thermal Information and validated per JEDEC JESD51 standards - confirming suitability for under-hood applications up to 105°C ambient.