LMR23630_017 Datasheet, PDF (1/42 Pages) Texas Instruments – SIMPLE SWITCHER 36-V, 3-A Synchronous Step-Down Converter

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LMR23630
SNVSAH2C – DECEMBER 2015 – REVISED JUNE 2017
LMR23630 SIMPLE SWITCHER^® 36-V, 3-A Synchronous Step-Down Converter
1 Features
•1 4.5-V to 36-V Input Range (HSOIC)
• 4-V to 36-V Input Range (WSON)
• 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 and Adjustable
Frequency Options
• 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 HHSOIC with PowerPAD™ Package
• 12-Pin WSON Wettable Flanks Package with
PowerPAD™
• Create a Custom Design Using the LMR23625
With the WEBENCH^® Power Designer
2 Applications
• Programmable Logic Controller Power Supply
• Multi-Function Printers
• HVAC Systems
• Industrial Power Supplies
• GSM, GPRS Modules for Fleet Management,
Smart Grids, and Security
VIN up to 36 V
Simplified Schematic
CIN
VIN
EN/SYNC
BOOT
AGND
SW
CVCC
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 (HSOIC) and 4
V to 36 V (WSON), it is suitable for various industrial
applications 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 the device 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
an option for constant frequency FPWM mode to
achieve small output-voltage ripple at light load. An
extended family (HSOIC) is available in 1-A
(LMR23610) and 2.5-A (LMR23625) load-current
options in a pin-to-pin compatible package allowing
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)
LMR23630
HSOIC (8)
WSON (12)
4.89 mm × 3.90 mm
3.00 mm × 3.00 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.