LMR23615 Datasheet, PDF (1/32 Pages) Texas Instruments – SIMPLE SWITCHER 36-V, 1.5-A Synchronous Step-Down Converter

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LMR23615
SNVSAV8 – JUNE 2017
LMR23615 SIMPLE SWITCHER^® 36-V, 1.5-A Synchronous Step-Down Converter
1 Features
•1 4-V to 36-V Input Range
• 1.5-A Continuous Output Current
• Integrated Synchronous Rectification
• Current-Mode Control with internal compensation
• Minimum Switch ON Time: 60 ns
• Adjustable Switching Frequency
• PFM Mode at Light Load
• Frequency Synchronization to External Clock
• 75-µA Quiescent Current
• Soft-Start into a Pre-Biased Load
• High-Duty-Cycle Operation Supported
• Output Short-Circuit Protection With Hiccup Mode
• Thermal Protection
• 12-Pin WSON Wettable Flanks Package With
PowerPAD™
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
space
Simplified Schematic
VIN up to 36 V
CIN
CVCC
VIN
EN/SYNC
BOOT
AGND
SW
VCC
FB
PGND
CBOOT _L
RFBT
RFBB
VOUT
COUT
Copyright © 2017, Texas Instruments Incorporated
3 Description
The LMR23615 SIMPLE SWITCHER^® is an easy-to-
use 36-V, 1.5-A synchronous step-down regulator.
With a wide input range from 4 V to 36 V, the device
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 and also minimizes the external
components needed. An extended family is available
in 2.5-A (LMR23625) and 3-A (LMR23630) load-
current options in pin-to-pin compatible packages,
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)
LMR23615
WSON (12) 3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Load, V_IN = 12 V
100
90
80
70
60
50
VOUT = 5 V
VOUT = 3.3 V
40
1E-5 0.0001 0.001 0.01
0.1
1
10
IOUT (A)
LMR2
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. ADVANCE INFORMATION for pre-production products; subject to
change without notice.