LM25018 7.5-48V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator | TI.com

LM25018 (ACTIVE) 7.5-48V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator

 

Description

The LM25018 device is a 48-V, 325-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25018 device requires no loop compensation, provides excellent transient response, and enables very high 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 startup 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 LM25018 device is available in WSON-8 and SO Power PAD-8 plastic packages.

Features

  • Wide 7.5-V to 48-V Input Range
  • Integrated 325-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
  • Create a Custom Design Using the LM25018 With the WEBENCH® Power Designer

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Topology Option
  Min   Max Range
Vin  V 7 to 42V
Vout  V 1.225 to 30V
Iout  A 0 to 2.5A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Switching frequency (Max) (kHz) Soft start Features Operating temperature range (C) Topology
LM25018 Order now 7.5     48     1.25     40     1000     Adjustable     Over Current Protection
Synchronous Rectification
UVLO Adjustable    
-40 to 125     Buck
Inverting Buck-Boost