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LM25017 Datenblatt(PDF) 3 Page - Texas Instruments

Teilenummer LM25017
Bauteilbeschribung  LM25017 48-V, 650-mA Constant On-Time Synchronous Buck Regulator
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM25017 Datenblatt(HTML) 3 Page - Texas Instruments

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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
LM25017
www.ti.com
SNVS951D – DECEMBER 2012 – REVISED DECEMBER 2014
5 Pin Configuration and Functions
8-Pin HSOP
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 current
3
UVLO
I
Input Pin of Undervoltage Comparator
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 internal
5
FB
I
Feedback
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. Solder
EP
Exposed Pad
to the system ground plane on application board for
reduced thermal resistance.
Copyright © 2012–2014, Texas Instruments Incorporated
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