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LM5165YDRCR

150mA sync buck, 4.5-65V in, COT control, 13uA Iq, SOT-23-6

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Manufacturer Part：

LM5165YDRCR

Package：

SOT-23-6 (2.9 x 1.6 x 1.1 mm)

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Description

Product Overview

The LM5165YDRCR from Texas Instruments is a 150mA synchronous buck converter with 4.5V to 65V input in a SOT-23-6 package. Using constant on-time (COT) control with integrated high-side and low-side MOSFETs, it requires no external compensation and achieves up to 92% efficiency.

Key Specifications

Input Voltage 4.5V ~ 65V
Output Current 150mA
Output Voltage 1V ~ VIN x 0.9 adjustable
Switching Frequency ~600kHz (adaptive)
Quiescent Current 13uA (standby)
Integrated MOSFETs Yes (high-side + low-side)
Package SOT-23-6
Operating Temperature -40°C to +150°C (TJ)

Features

  • 4.5V to 65V wide input voltage range
  • Integrated synchronous MOSFETs
  • 13uA standby quiescent current
  • Constant on-time (COT) control – no compensation needed
  • Adjustable output with precision feedback
  • Internal soft-start and current limit protection

Applications

  • Industrial 24V/48V to low-voltage POL
  • Building automation and HVAC power
  • Telecom 48V bus power conversion
  • Battery-powered instrumentation
  • Automotive auxiliary power rails

The LM5165YDRCR from Texas Instruments is a 150mA synchronous buck converter in a tiny SOT-23-6 package supporting 4.5V to 65V input. Using constant on-time (COT) control with integrated high-side and low-side MOSFETs, it requires no external compensation components. The 13uA standby quiescent current extends battery life in always-on applications. The adaptive on-time maintains near-constant switching frequency while providing excellent transient response. Internal soft-start prevents inrush current, and cycle-by-cycle current limit provides robust overload protection. The device is ideal for high-voltage industrial bus to low-voltage POL conversion.

The LM5165YDRCR uses constant on-time (COT) control, a hysteretic-derived topology where the high-side MOSFET is turned on for a fixed on-time when the output voltage drops below the regulation threshold. The on-time is proportional to VOUT/VIN to maintain approximately constant switching frequency. During the on-time, current flows from VIN through the inductor to VOUT. When the on-time expires, the high-side MOSFET turns off and the low-side MOSFET turns on, allowing inductor current to freewheel. When the output voltage again drops below the threshold, the cycle repeats. In Eco-mode at light loads, the low-side MOSFET turns off when inductor current reaches zero, enabling discontinuous conduction mode (DCM) with higher efficiency.

Pin Name Type Function
1 FB Input Output voltage feedback
2 GND Power Ground
3 EN Input Enable (internal pull-up)
4 SW Power Switch node (inductor connection)
5 VIN Power Input voltage (4.5-65V)
6 VCC Power Internal 3.3V LDO output (bypass cap)
  • 24V/48V industrial bus to 3.3V/5V POL conversion
  • Building automation HVAC sensor power supply
  • Telecom -48V bus to low-voltage regulation
  • Battery-powered field instrumentation
  • Automotive 12V/24V auxiliary power rails
Manufacturer Part Number Package Notes
TI LM5164YDRRR SOT-23-6 100mA, 100V, higher voltage
TI LM5166YDRRR SOT-23-6 300mA, 65V, higher current
Monolithic Power MP8714DN SOT-23-6 150mA, 60V sync buck
ADI LTC3630EMSE MSOP-12 500mA, 65V, higher current
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Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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