LM5165-Q1

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Automotive, 3V-65V, 150mA Synchronous Buck Converter With Ultra-Low IQ

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Product details

Parameters

Vin (Min) (V) 3 Vin (Max) (V) 65 Vout (Min) (V) 1.23 Vout (Max) (V) 65 Iout (Max) (A) 0.15 Iq (Typ) (mA) 0.01 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 600 Features Adjustable Current Limit, Enable, Light Load Efficiency, Over Current Protection, Power Good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 150 Rating Automotive Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VSON (DRC) 10 9 mm² 3 x 3 VSSOP (DGS) 10 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)

Features

  • AEC-Q100 Qualified for Automotive Applications
    • Device Temperature Grade 1: –40ºC to 125ºC Ambient Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C5
  • Wide Input Voltage Range of 3 V to 65 V
  • Fixed (3.3-V, 5-V) or Adjustable Output Voltages
  • Maximum Output Current as High as 150 mA
  • 10.5-µA No Load Quiescent Current
  • –40°C to 150°C Junction Temperature Range
  • Selectable PFM or COT Mode Operation
  • Active Slew Rate Control for Low EMI
  • Integrated 2-Ω PMOS Buck Switch
    • Supports 100% Duty Cycle for Low Dropout
  • Integrated 1-Ω NMOS Synchronous Rectifier
    • Eliminates External Rectifier Diode
  • Programmable Current Limit Setpoint (4 Levels)
  • 1.223-V Internal Voltage Reference
  • 900-µs Internal or Programmable Soft Start
  • Monotonic Start-Up into Prebiased Output
  • No Loop Compensation or Bootstrap Components
  • Precision Enable and Input UVLO With Hysteresis
  • Thermal Shutdown Protection With Hysteresis
  • 10-Pin VSON and VSSOP Packages
  • Create a Custom Regulator Design Using WEBENCH® Power Designer

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Description

The LM5165-Q1 device is a compact, easy-to-use, 3-V to 65-V, ultra-low IQ synchronous buck converter with high efficiency over wide input voltage and load current ranges. With integrated high-side and low-side power MOSFETs, up to 150-mA of output current can be delivered at either fixed output voltages of 3.3 V or 5 V or at an adjustable output. The converter is designed to simplify implementation while providing options to optimize the performance for the target application. Pulse Frequency Modulation (PFM) mode is selected for optimal light-load efficiency or Constant On-Time (COT) control for nearly constant operating frequency. Both control schemes do not require loop compensation while providing excellent line and load transient response and short PWM on-time for large step-down conversion ratios.

The high-side P-channel MOSFET can operate at 100% duty cycle for lowest dropout voltage and does not require a bootstrap capacitor for gate drive. Also, the current limit setpoint is adjustable to optimize inductor selection for a particular output current requirement. Selectable and adjustable start-up timing options include minimum delay (no soft start), internally fixed (900 µs), and externally programmable soft start using a capacitor. An open-drain PGOOD indicator can be used for sequencing, fault reporting, and output voltage monitoring. The LM5165-Q1 is qualified to automotive AEC-Q100 grade 1 and is available in 10-pin VSON and VSSOP packages with 0.5-mm pin pitch.

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Technical documentation

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$49.00
Description
The LM5165EVM-HD-C50X high density evaluation module (EVM) is designed to showcase the performance of the LM5165 high performance, exceptionally small, synchronous buck DC/DC buck converter with ultralow IQ. The module-style design is packaged in a miniature footprint with low component count. It (...)
Features
  • Tightly-regulated output voltage of 5 V with 2% setpoint accuracy
  • Wide input voltage operating range of 3 V to 65 V
  • Ultra-high power conversion efficiency: >90% at 5 V ouptut voltage and 150 mA load
  • No-load supply current as low as 12 μA
  • Fully assembled, tested and proven PCB layout with 15.5-mm x (...)
EVALUATION BOARDS Download
document-generic User guide
$29.00
Description

The LM5165EVM-HD-P50A high density evaluation module (EVM) is designed to showcase the performance of the LM5165 high performance, exceptionally small, synchronous buck DC/DC buck converter with ultralow IQ. The module-style design is packaged in a miniature footprint with low component count. It (...)

Features
  • Tightly-regulated output voltage of 5 V with 2% setpoint accuracy, adjustable from 1.223 V to VIN
  • Wide input voltage operating range of 3 V to 65 V
  • Ultra-high power conversion efficiency: >90% at an output of 5 V and above 1 mA load (input voltage 12 V)
  • No-load supply current as low as 12 μA
  • Fully (...)

Design tools & simulation

SIMULATION MODELS Download
SNVMAH3B.ZIP (133 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAJ5A.ZIP (95 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAJ6A.ZIP (90 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAK3A.ZIP (4 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAK4A.ZIP (4 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAK5B.ZIP (4 KB) - PSpice Model
CALCULATION TOOLS Download
LM5165 DC/DC Converter Design Tool
LM5165DESIGN-CALC — Welcome to the LM5165 quickstart design tool. This standalone tool facilitates and assists the power supply engineer with design of a DC/DC buck converter based on the LM5165 low IQ synchronous buck DC/DC regulator. As such, the user can expeditiously arrive at an optimized design to meet the (...)
Features
  • Determine filter inductance and input and output filter capacitances for a given operating mode (PFM or COT)
  • Optimize the design using efficiency and solution size as key performance metrics
  • Select components for soft-start, input UVLO, output voltage setpoint, current limit and switching frequency
  • (...)

Reference designs

REFERENCE DESIGNS Download
Adjustable output voltage, 200-W SEPIC power supply reference design
PMP22270 — This 200-W SEPIC converter reference design supplies a non-isolated adjustable 5-V to 200-V output voltage with a maximum output current of 4 A. Output voltage is set using a 0% to 100% duty-cycle, pulse-width-modulation (PWM) input.
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VSON (DRC) 10 View options
VSSOP (DGS) 10 View options

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