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LM5019
  • LM5019
  • LM5019
  • LM5019
  • LM5019

LM5019

ACTIVE

7.5-100V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator

Texas Instruments LM5019 Product Info

1 April 2026 4

Parameters

Rating

Catalog

Topology

Buck, Flybuck

Iout (max) (A)

0.1

Vin (max) (V)

100

Vin (min) (V)

7.5

Vout (max) (V)

90

Vout (min) (V)

1.25

Switch current limit (typ) (A)

0.3

Features

Enable, Synchronous rectification, UVLO adjustable

Control mode

Constant on-time (COT)

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.00005

Duty cycle (max) (%)

90

Package

HSOIC (DDA)-8-29.4 mm² 4.9 x 6

Features

  • Wide 7.5-V to 100-V input range
  • Integrated 100-mA high-side and low-side switches
  • No schottky required
  • Constant on-time control
  • No loop compensation required
  • Ultra-fast transient response
  • Nearly constant operating frequency
  • Intelligent peak current limit
  • Adjustable output voltage from 1.225 V
  • Precision 2% feedback reference
  • Frequency adjustable to 1 MHz
  • Adjustable undervoltage lockout
  • Remote shutdown
  • Thermal shutdown
  • Packages:
    • 8-Pin WSON
    • 8-Pin SO PowerPAD
  • Create a custom design using the LM5019 with the WEBENCH Power Designer
  • Wide 7.5-V to 100-V input range
  • Integrated 100-mA high-side and low-side switches
  • No schottky required
  • Constant on-time control
  • No loop compensation required
  • Ultra-fast transient response
  • Nearly constant operating frequency
  • Intelligent peak current limit
  • Adjustable output voltage from 1.225 V
  • Precision 2% feedback reference
  • Frequency adjustable to 1 MHz
  • Adjustable undervoltage lockout
  • Remote shutdown
  • Thermal shutdown
  • Packages:
    • 8-Pin WSON
    • 8-Pin SO PowerPAD
  • Create a custom design using the LM5019 with the WEBENCH Power Designer

Description

The LM5019 is a 100-V, 100-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant-on-time (COT) control scheme employed in the LM5019 requires no loop compensation, provides excellent transient response, and enables very low step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high-voltage start-up regulator provides bias power for internal operation of the IC and for integrated gate drivers.

A peak current limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed. Other protection features include thermal shutdown and bias supply undervoltage lockout.

The LM5019 device is available in WSON-8 and SO PowerPAD-8 plastic packages.

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