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LM25019 データシート(PDF) 3 Page - Texas Instruments

部品番号 LM25019
部品情報  LM25019 48-V, 100-mA Constant On-Time Synchronous Buck Regulator
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

LM25019 データシート(HTML) 3 Page - Texas Instruments

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background image
SW
BST
VCC
FB
8
7
6
5
1
2
3
4
UVLO
RON
RTN
VIN
WSON-8
Exp Pad
UVLO
3
RON
4
RTN
1
VIN
2
8
SW
7
BST
6
VCC
5
FB
SO
PowePAD-8
Exp Pad
LM25019
www.ti.com
SNVS952D – DECEMBER 2012 – REVISED DECEMBER 2014
5 Pin Configuration and Functions
8-Pin SO PowerPAD
DDA Package
Top View
8-Pin WSON
NGU Package
Top View
Pin Functions
PIN
I/O
DESCRIPTION
APPLICATION INFORMATION
NO.
NAME
1
RTN
Ground
Ground connection of the integrated circuit.
2
VIN
I
Input Voltage
Operating input range is 7.5 V to 48 V.
Resistor divider from VIN to UVLO to GND programs
the undervoltage detection threshold. An internal
3
UVLO
I
Input Pin of Undervoltage Comparator
current source is enabled when UVLO is above 1.225 V
to provide hysteresis. When UVLO pin is pulled below
0.66 V externally, the regulator is in shutdown mode.
A resistor between this pin and VIN sets the buck switch
4
RON
I
On-Time Control
on-time as a function of VIN. Minimum recommended
on-time is 100 ns at max input voltage.
This pin is connected to the inverting input of the
5
FB
I
Feedback
internal regulation comparator. The regulation level is
1.225 V.
The internal VCC regulator provides bias supply for the
Output from the Internal High Voltage
6
VCC
O
gate drivers and other internal circuitry. A 1.0-
μF
Series Pass Regulator. Regulated at 7.6 V
decoupling capacitor is recommended.
An external capacitor is required between the BST and
SW pins (0.01-
μF ceramic). The BST pin capacitor is
7
BST
I
Bootstrap Capacitor
charged by the VCC regulator through an internal diode
when the SW pin is low.
Power switching node. Connect to the output inductor
8
SW
O
Switching Node
and bootstrap capacitor.
Exposed pad must be connected to the RTN pin.
EP
Exposed Pad
Solder to the system ground plane on application board
for reduced thermal resistance.
Copyright © 2012–2014, Texas Instruments Incorporated
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3
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