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LMR23625CFQDDAQ1 データシート(PDF) 10 Page - Texas Instruments

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部品番号 LMR23625CFQDDAQ1
部品情報  SIMPLE SWITCHER 36-V, 2.5-A Synchronous Step-Down Converter
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - 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
10
LMR23625-Q1
SNVSAR5B – DECEMBER 2016 – REVISED MARCH 2018
www.ti.com
Product Folder Links: LMR23625-Q1
Submit Documentation Feedback
Copyright © 2016–2018, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The LMR23625-Q1 SIMPLE SWITCHER® regulator is an easy-to-use synchronous step-down DC-DC converter
operating from a 4-V to 36-V supply voltage. It is capable of delivering up to 2.5-A, DC-load current with good
thermal performance in a small solution size. An extended family is available, for both the SOIC and WSON
packages, in multiple current options from 1 A to 3 A in pin-to-pin compatible packages.
The LMR23625-Q1 employs fixed-frequency peak-current-mode control. The device enters PFM mode at light
load to achieve high efficiency. A user-selectable FPWM option is provided to achieve low output voltage ripple,
tight output voltage regulation, and constant switching frequency. The device is internally compensated, which
reduces design time and requires few external components. The LMR23625-Q1 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 (UVLO), 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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