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LMZ31503RUQT Scheda tecnica(PDF) 6 Page - Texas Instruments

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Il numero della parte LMZ31503RUQT
Spiegazioni elettronici  3A SIMPLE SWITCHER Power Module with 4.5V-14.5V Input in QFN Package
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Homepage  http://www.ti.com
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LMZ31503
SNVS992 – JULY 2013
www.ti.com
PIN DESCRIPTIONS
TERMINAL
DESCRIPTION
NAME
NO.
1
2
Zero VDC reference for the analog control circuitry. Connect AGND to PGND at a single point. Connect near
AGND
the output capacitors. See for a recommended layout.
34
45
8
Inhibit and UVLO adjust pin. Use an open drain or open collector output logic to control the INH function. A
INH/UVLO
resistor divider between this pin, AGND and VIN adjusts the UVLO voltage. Tie both pins together when
9
using this control.
3
4
5
15
16
18
Do Not Connect. Do not connect these pins to AGND, to another DNC pin, or to any other voltage. These
DNC
19
pins are connected to internal circuitry. Each pin must be soldered to an isolated pad.
20
22
23
30
31
32
36
Common ground connection for the PVIN, VIN, and VOUT power connections. See for a recommended
PGND
37
layout.
38
10
11
12
Phase switch node. These pins should be connected to a small copper island under the device for thermal
PH
13
relief. Do not place any external component on this pin or tie it to a pin of another function.
14
17
46
PWRGD
33
Power good fault pin. Asserts low if the output voltage is low. A pull-up resistor is required.
39
Input switching voltage. This pin supplies voltage to the power switches of the converter. See for a
PVIN
40
recommended layout.
41
This pin automatically selects between RT mode and CLK mode. An external timing resistor adjusts the
RT/CLK
35
switching frequency of the device. In CLK mode, the device synchronizes to an external clock.
Remote sense connection. Connect this pin to VOUT at the load for improved regulation. This pin must be
SENSE+
44
connected to VOUT at the load, or at the module pins.
Slow-start and tracking pin. Connecting an external capacitor to this pin adjusts the output voltage rise time.
SS/TR
6
A voltage applied to this pin allows for tracking and sequencing control.
Slow-start or track feature select. Connect this pin to AGND to enable the internal SS capacitor with a SS
STSEL
7
interval of approximately 1.1 ms. Leave this pin open to enable the TR feature.
VADJ
43
Connecting a resistor between this pin and AGND sets the output voltage.
VIN
42
Input bias voltage pin. Supplies the control circuitry of the power converter. See for a recommended layout.
6
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Copyright © 2013, Texas Instruments Incorporated
Product Folder Links: LMZ31503


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