LMR23625-Q1_16 Datasheet, PDF (11/37 Pages) Texas Instruments – SIMPLE SWITCHER 36 V, 2.5 A Synchronous Step-Down Converter

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8 Detailed Description
LMR23625-Q1
SNVSAR5 – DECEMBER 2016
8.1 Overview
The LMR23625-Q1 SIMPLE SWITCHER^® regulator is an easy to use synchronous step-down DC-DC converter
operating from 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. For both SOIC and WSON package, an extended family is
available 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
under-voltage lockout, cycle-by-cycle current limit, and hiccup mode short-circuit protection.
The family requires very few external components and has a pin-out designed for simple, optimum PCB layout.
8.2 Functional Block Diagram
EN/SYNC
VCC
SYNC Signal
SYNC
Detector
Internal
SS
VCC
Enable
Precision
Enable
LDO
VIN
HS I Sense
CBOOT
REF
EA
Rc
Cc
TSD
UVLO
(PGOOD)
AGND
OV/UV
Detector _FB
SYNC Signal
Oscillator
PFM
PWM CONTROL LOGIC
SW
Detector
Slope
Comp
Freq
Foldback
Zero
Cross
HICCUP
Detector
LS I Sense
FB
PGND
Copyright © 2016, Texas Instruments Incorporated
Copyright © 2016, Texas Instruments Incorporated
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