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LMR14206XMK Datasheet(PDF) 9 Page - Texas Instruments

No. de pieza LMR14206XMK
Descripción Electrónicos  LMR14206 SIMPLE SWITCHER 42Vin, 0.6A Step-Down Voltage Regulator in SOT-23
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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LMR14206XMK Datasheet(HTML) 9 Page - Texas Instruments

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FB
GND
SW
CB
SHDN
LMR14206
5V OUT
7V to 42V IN
L1
D1
60V 1A
R1
R2
5.62k
1.02k
VIN
CIN
CBOOT
COUT
47 PF
15 PH
2.2 PF
0.15 PF
FB
GND
SW
CB
SHDN
LMR14206
3.3V OUT
4.5V to 42V IN
L1
D1
60V 1A
R1
R2
3.4k
1.02k
VIN
CIN
CBOOT
COUT
47 PF
15 PH
0.15 PF
2.2 PF
LMR14206
www.ti.com
SNVS733D – OCTOBER 2011 – REVISED APRIL 2013
LAYOUT CONSIDERATIONS
To reduce problems with conducted noise pick up, the ground side of the feedback network should be connected
directly to the GND pin with its own connection. The feedback network, resistors R1 and R2, should be kept
close to the FB pin, and away from the inductor to minimize coupling noise into the feedback pin. The input
bypass capacitor CIN must be placed close to the VIN pin. This will reduce copper trace resistance which effects
input voltage ripple of the IC. The inductor L1 should be placed close to the SW pin to reduce EMI and capacitive
coupling. The output capacitor, COUT should be placed close to the junction of L1 and the diode D1. The L1, D1,
and COUT trace should be as short as possible to reduce conducted and radiated noise and increase overall
efficiency. The ground connection for the diode, CIN, and COUT should be as small as possible and tied to the
system ground plane in only one spot (preferably at the COUT ground point) to minimize conducted noise in the
system ground plane. For more detail on switching power supply layout considerations see Application Note AN-
1149: Layout Guidelines for Switching Power Supplies SNVA021.
Typical Applications
Figure 9. Application Circuit, 3.3V Output
Figure 10. Application Circuit, 5V Output
Copyright © 2011–2013, Texas Instruments Incorporated
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