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LM25019SDE Datasheet(PDF) 9 Page - Texas Instruments

Part # LM25019SDE
Description  100-mA Constant On-Time Synchronous Buck Regulator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM25019SDE Datasheet(HTML) 9 Page - Texas Instruments

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background image
FB
VIN
VCC
SW
RTN
BST
1.225V
VILIM
LM25019
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
LM25019
www.ti.com
SNVS952E – DECEMBER 2012 – REVISED NOVEMBER 2015
7 Detailed Description
7.1 Overview
The LM25019 step-down switching regulator features all the functions needed to implement a low-cost, efficient,
buck converter that can supply up to 100 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 simplified block diagram of the LM25019 device is shown in Figure 10.
The LM25019 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, minimum forced off-time, and an intelligent current limit.
7.2 Functional Block Diagram
Figure 10. Functional Block Diagram
Copyright © 2012–2015, Texas Instruments Incorporated
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