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LM25018 Fiches technique(PDF) 8 Page - Texas Instruments

No de pièce LM25018
Description  LM25018 48-V, 325-mA Constant On-Time Synchronous Buck Regulator
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

LM25018 Fiches technique(HTML) 8 Page - Texas Instruments

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background image
FB
VIN
VCC
SW
RTN
BST
1.225V
VILIM
LM25018
RON
ILIM
COMPARATOR
+
-
V UVLO
ON/OFF
TIMERS
COT CONTROL
LOGIC
1.225V
START-UP
REGULATOR
VIN
FEEDBACK
DISABLE
THERMAL
SHUTDOWN
UVLO
OVER-VOLTAGE
1.62V
UVLO
4.5V
SD
SHUTDOWN
VDD REG
BG REF
0.66V
20 µA
CURRENT
LIMIT
ONE-SHOT
LM25018
SNVS953D – DECEMBER 2012 – REVISED DECEMBER 2014
www.ti.com
7 Detailed Description
7.1 Overview
The LM25018 step-down switching regulator features all the functions needed to implement a low cost, efficient,
buck converter capable of supplying up to 325 mA to the load. This high voltage regulator contains 48 V,
N-channel buck and synchronous switches, is easy to implement, and is provided in thermally enhanced SO
PowerPAD-8 and WSON-8 packages. The regulator operation is based on a constant on-time control scheme
using an on-time inversely proportional to VIN. This control scheme does not require loop compensation. The
current limit is implemented with a forced off-time inversely proportional to VOUT. This scheme ensures short
circuit protection while providing minimum foldback.
The LM25018 device can be applied in numerous applications to efficiently regulate down higher voltages. This
regulator is well suited for 12-V and 24-V rails. Protection features include: thermal shutdown, Undervoltage
Lockout (UVLO), minimum forced off-time, and an intelligent current limit.
7.2 Functional Block Diagram
8
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Copyright © 2012–2014, Texas Instruments Incorporated
Product Folder Links: LM25018


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