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Wide Input 4.5-V to 100-V, 1-A Synchronous Buck / Fly-Buck Converter

Availability: 3,439


Package | PIN: HTSSOP (PWP) | 14
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $4.61
10-24 $4.15
25-99 $3.88
100-249 $3.48
250-499 $3.24
500-749 $2.82
750-999 $2.44
1,000+ $2.39


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating TemperatureRange
    • Device HBM ESD Classification Level 2
    • Device CDM ESDClassification Level C5
  • Wide 4.5-V to 100-V Input Voltage Range
  • Integrated High-Side and Low-Side Switches
    • No Schottky Diode Required
  • 1-A Maximum Load Current
  • Constant ON-Time Control
    • No External Loop Compensation
    • Fast Transient Response
  • Selectable DCM Buck Operation at Light Load
  • CCM Option Supports Multi-Output Fly-Buck™
  • No External Ripple circuit needed (at FPWM = 0)
  • Nearly Constant Switching Frequency
  • Frequency Adjustable Up to 1 MHz
  • Programmable Soft-Start Time
  • Prebias Start-Up
  • Peak Current Limiting Protection
  • Adjustable Input UVLO and Hysteresis
  • ±1% Feedback Voltage Reference
  • Thermal Shutdown Protection
  • Create a Custom Design Using the LM5161-Q1 With the WEBENCH® Power Designer

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Texas Instruments  LM5161QPWPTQ1

The LM5161-Q1 is a 100-V, 1-A synchronous step-down converter with integrated high-sideand low-side MOSFETs. The constant-ON-time control scheme requires no loop compensation andsupports high step-down ratios with fast transient response. An internal feedback amplifiermaintains ±1% output voltage regulation over the entire operating temperature range. The ON-timevaries inversely with input voltage resulting in nearly constant switching frequency. Peak andvalley current limit circuits protect against overload conditions. The under-voltage lockout(EN/UVLO) circuit provides independently adjustable input undervoltage threshold and hysteresis.The FPWM input pin in LM5161-Q1 selects either the forced continuous conduction mode (CCM) underall load levels or the discontinuous conduction mode (DCM) under light or no load conditions. Whenoperating in forced CCM, the LM5161-Q1 supports the multiple output and isolated Fly-Buckapplications. When programmed for the DCM operation, the LM5161-Q1 provides a tightly regulatedbuck output without any additional external feedback ripple injection circuit.