LMR23625_17 Datasheet, PDF (1/40 Pages) Texas Instruments – SIMPLE SWITCHER 36 V, 2.5 A Synchronous Step-Down Converter

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LMR23625
SNVSAH3B – DECEMBER 2015 – REVISED APRIL 2017
LMR23625 SIMPLE SWITCHER^® 36 V, 2.5 A Synchronous Step-Down Converter
1 Features
•1 4.5 V to 36 V Input Range
• 2.5 A Continuous Output Current
• Integrated Synchronous Rectification
• Current Mode Control
• Minimum Switch-On Time: 60 ns
• 2.1 MHz Switching Frequency With PFM and
Forced PWM Mode Options
• Frequency Synchronization to External Clock
• Internal Compensation for Ease of Use
• 75 µA Quiescent Current at No Load
• Soft-Start into a Pre-Biased Load
• High Duty Cycle Operation Supported
• Precision Enable Input
• Output Short-Circuit Protection with Hiccup Mode
• Thermal Protection
• 8-Pin HSOIC with PowerPAD™ Package
• Create a Custom Design Using the LMR23625
With the WEBENCH^® Power Designer
2 Applications
• Automotive Battery Regulation
• Industrial Power Supplies
• Telecom and Datacom Systems
• General Purpose Wide Vin Regulation
VIN up to 36 V
CIN
CVCC
Simplified Schematic
VIN
EN/SYNC
BOOT
AGND
SW
VCC
FB
PGND
CBOOT _L
RFBT
RFBB
VOUT
COUT
3 Description
The LMR23625 SIMPLE SWITCHER^® is an easy to
use 36 V, 2.5 A synchronous step down regulator.
With a wide input range from 4.5 V to 36 V, it is
suitable for various applications from industrial to
automotive for power conditioning from unregulated
sources. Peak current mode control is employed to
achieve simple control loop compensation and cycle-
by-cycle current limiting. A quiescent current of 75 μA
makes it suitable for battery powered systems. An
ultra-low 2 μA shutdown current can further prolong
battery life. Internal loop compensation means that
the user is free from the tedious task of loop
compensation design. This also minimizes the
external components. The device has option for fixed
frequency FPWM mode to achieve small output
voltage ripple at light load. An extended family is
available in 1 A (LMR23610) and 3 A (LMR23630)
load current options in pin-to-pin compatible
packages which allows simple, optimum PCB layout.
A precision enable input allows simplification of
regulator control and system power sequencing.
Protection features include cycle-by-cycle current
limit, hiccup mode short circuit protection and thermal
shutdown due to excessive power dissipation.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMR23625C
HSOIC (8)
4.89 mm x 3.90 mm
LMR23625CF
(FPWM Option)
HSOIC (8)
4.89 mm x 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Load
V_IN = 12 V, PFM Option
100
90
80
70
60
50
0.0001
0.001
0.01
0.1
I_OUT (A)
V_OUT = 5 V
V_OUT = 3.3 V
1
10
D000
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.