LMR23625 Datasheet, PDF (1/9 Pages) Texas Instruments – SIMPLE SWITCHER 36 V, 2.5 A Synchronous Step-Down Converter

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LMR23625
SNVSAH3 – DECEMBER 2015
LMR23625 SIMPLE SWITCHER^® 36 V, 2.5 A Synchronous Step-Down Converter
1 Features
•1 4 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 and Overvoltage 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
C1
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 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. 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 3 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.
The LMR23625 is available in an 8-pin HSOIC
package with exposed pad for low thermal resistance.
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
Vout = 5 V
100
90
80
70
60
50
40
0.0001
0.001
0.01
0.1
I_OUT (A)
PFM, V_IN = 24 V
PFM, V_IN = 12 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. PRODUCT PREVIEW Information. Product in design phase of
development. Subject to change or discontinuance without notice.