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LM3253 Scheda tecnica(PDF) 3 Page - Texas Instruments

Il numero della parte LM3253
Spiegazioni elettronici  High-Current Step-Down Converter
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LM3253 Scheda tecnica(HTML) 3 Page - Texas Instruments

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LM3253
www.ti.com
SNVS791Q – FEBRUARY 2012 – REVISED MAY 2013
Pin Descriptions
Pin #
Name
Description
A1
PGND
Power Ground to the internal NFET switch.
B1
C1
SGND
Signal Analog and Control Ground (Low Current).
D1
VDD
Analog Supply Input.
A2
Switching Node connection to the internal PFET switch and NFET synchronous rectifier. Connect
SW
to an inductor with a saturation current rating that exceeds the ILIM,PFET,Steady State Current Limit
B2
specification of the LM3253.
Enable Input. Set this digital input HIGH for normal operation. For shutdown, set low. Pin has an
C2
EN
800 k
Ω internal pulldown resistor.
D2
VCON
Voltage Control Analog input. VOUT = 2.5 x VCON.
A3
PVIN
Power Supply Voltage Input to the internal PFET switch and ACB.
B3
Bypass Mode Input. Set the pin HIGH for forced Bypass mode operation. Set the pin LOW for
C3
BP
automatic Analog Bypass Mode (recommended).
PWM/PFM Mode Selection Input. Setting the pin HIGH allows for PFM or PWM, depending on
D3
MODE
the load current. Setting the pin LOW forces the part to be in PWM only.
A4
ACB
Analog Current Bypass. Connect to the output at the output filter capacitor.
B4
C4
BGND
Active Current assist and analog Bypass Ground (High Current).
D4
FB
Feedback Analog Input. Connect to the output at the output filter capacitor.
Copyright © 2012–2013, Texas Instruments Incorporated
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