LMR23630_17 Datasheet, PDF (1/40 Pages) Texas Instruments – SIMPLE SWITCHER 36 V, 3 A Synchronous Step-Down Converter

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LMR23630
SNVSAH2B – DECEMBER 2015 – REVISED APRIL 2017
LMR23630 SIMPLE SWITCHER^® 36 V, 3 A Synchronous Step-Down Converter
1 Features
•1 4.5 V to 36 V Input Range
• 3 A Continuous Output Current
• Integrated Synchronous Rectification
• Current Mode Control
• Minimum Switch-On Time: 60 ns
• Internal Compensation for Ease of Use
• 400 kHz Switching Frequency With PFM and
Forced PWM Mode Options
• Frequency Synchronization to External Clock
• 75 µA Quiescent Current at No Load for PFM
Option
• 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
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 LMR23630 SIMPLE SWITCHER^® is an easy to
use 36 V, 3 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 constant frequency FPWM
mode to achieve small output voltage ripple at light
load. An extended family is available in 1 A
(LMR23610) and 2.5 A (LMR23625) load current
options in pin-to-pin compatible package 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)
LMR23630A
HSOIC (8)
4.89 mm x 3.90 mm
LMR23630AF
(FPWM Option)
HSOIC (8)
4.89 mm x 3.90 mm
(1) For detail part numbers for all available different options, 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
40
0.0001
0.001
0.01
0.1
I_OUT (A)
V_OUT = 5 V
V_OUT = 3.3 V
1
10
D001
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.