LMR23630 Datasheet, PDF (1/9 Pages) Texas Instruments – SIMPLE SWITCHER 36 V, 3 A Synchronous Step-Down Converter

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LMR23630
SNVSAH2 – DECEMBER 2015
LMR23630 SIMPLE SWITCHER^® 36 V, 3 A Synchronous Step-Down Converter
1 Features
•1 4 V to 36 V Input Range
• 3 A Continuous Output Current
• Integrated Synchronous Rectification
• 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
• Minimum Switch-On Time: 60 ns
• High Duty Cycle Operation Supported
• Precision Enable Input
• Output Short-Circuit Protection with Hiccup Mode
• Thermal and Overvoltage Protection
• 8-Pin HSOIC with PowerPAD™ Package
2 Applications
• Automotive Battery Regulation
• Industrial Power Supplies
• Telecom and Datacom Systems
• Battery Powered System
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 V to 36 V, it’s 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. The regulator’s quiescent current is 75 μA
makes it suitable for battery powered systems. An
ultra-low 2 μA current in shutdown mode can further
prolong battery life. The switching frequency options
allow either efficiency or solution size to be optimized.
Internal loop compensation means that the user is
free from the tedious task of loop compensation
design. This also minimizes the external components
of the device. The device has option for fixed
frequency FPWM mode to eliminate frequency
variation to minimize EMI. An extended family is
available in 1 A and 2 A 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.
VIN up to 36 V
CIN
C1
Simplified Schematic
VIN
EN/SYNC
BOOT
AGND
SW
VCC
FB
PGND
CBOOT _L
RFBT
RFBB
VOUT
COUT
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 all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Load
100
90
80
70
60
50
40
0.0001
0.001
0.01
I_OUT (A)
PFM, V_IN = 12 V
PFM, V_IN = 24 V
0.1
13
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. PRODUCT PREVIEW Information. Product in design phase of
development. Subject to change or discontinuance without notice.