Texas Instruments LM25018 Handleiding

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LM25018 48-V, 325-mA Constant On-Time Synchronous Buck/Fly-Buck™ Regulator

1 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

2 Applications

•Industrial equipment

•Smart power meters

•Telecommunication systems

•Isolated bias supply (Fly-Buck

™

)

3 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.

Device Information

PART NUMBERPACKAGEBODY SIZE (NOM)

LM25018

SO PowerPAD (8)4.89 mm × 3.90 mm

WSON (8)4.00 mm × 4.00 mm

+

+

+

V

IN

BST

RON

RTN

SW

VCC

FB

VIN

VOUT

R

FB1

R

R

C

UV1

R

ON

C

OUT

C

C

BST

IN

R

FB2

R

UV2

L1

UVLO

+

C

VCC

LM25018

7.5 V - 48 V

1

2

3

4

5

6

8

7

SD

Typical Application

LM25018

SNVS953G – DECEMBER 2012 – REVISED MAY 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Product specificaties