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LMR23630DRRT Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza LMR23630DRRT
Descripción Electrónicos  SIMPLE SWITCHER 36-V, 3-A Synchronous Step-Down Converter
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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LMR23630DRRT Datasheet(HTML) 11 Page - Texas Instruments

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EA
REF
EN/SYNC
SW
CBOOT
VCC
Internal
SS
OV/UV
Detector
Oscillator
Precision
Enable
LDO
PFM
Detector
Slope
Comp
PWM CONTROL LOGIC
UVLO
TSD
Freq
Foldback
Zero
Cross
HICCUP
Detector
VIN
Rc
Cc
PGND
FB
LS I Sense
HS I Sense
FB
VCC
Enable
SYNC
Detector
SYNC Signal
SYNC Signal
AGND
(PGOOD)
Copyright © 2016, Texas Instruments Incorporated
(RT)
11
LMR23630
www.ti.com
SNVSAH2C – DECEMBER 2015 – REVISED JUNE 2017
Product Folder Links: LMR23630
Submit Documentation Feedback
Copyright © 2015–2017, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The LMR23630 SIMPLE SWITCHER® regulator is an easy-to-use synchronous step-down DC-DC converter
operating from 4.5-V (HSOIC) and 4-V (WSON) to 36-V supply voltage. The device delivers up to 3-A DC load
current with good thermal performance in a small solution size. For both the HSOIC and WSON packages, an
extended family is available in multiple current options from 1 A to 3 A in pin-to-pin compatible packages.
The LMR23630 employs constant frequency peak-current-mode control. The device enters PFM mode at light
load to achieve high efficiency. A user-selectable FPWM version is provided to achieve low output voltage ripple,
tight output voltage regulation, and constant switching frequency. The switching frequency is 400 kHz for the
fixed-frequency version. For the version which has RT pin, the switching frequency is adjustable from 200 kHz to
2.2 MHz. The device is internally compensated, which reduces design time and requires few external
components. The LMR23630 is capable of synchronization to an external clock within the range of 200 kHz to
2.2 MHz.
Additional features such as precision enable, power-good flag, and internal soft-start provide a flexible and easy-
to-use solution for a wide range of applications. Protection features include thermal shutdown, VIN and VCC
undervoltage lockout, cycle-by-cycle current limit, and hiccup-mode short-circuit protection.
The family requires very few external components and has a pinout designed for simple, optimum PCB layout.
8.2 Functional Block Diagram


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