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LM25019MRX データシート(PDF) 4 Page - Texas Instruments

部品番号 LM25019MRX
部品情報  100-mA Constant On-Time Synchronous Buck Regulator
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LM25019MRX データシート(HTML) 4 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
SNVS952E – DECEMBER 2012 – REVISED NOVEMBER 2015
www.ti.com
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.
4
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Copyright © 2012–2015, Texas Instruments Incorporated
Product Folder Links: LM25019


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