LMR14050 Datasheet, PDF (15/31 Pages) Texas Instruments – LMR14050 SIMPLE SWITCHER 40 V 5 A, 2.2 MHz Step-Down Converter with 40 μA IQ

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9 Application and Implementation
LMR14050
SNVSAA6A – FEBRUARY 2015 – REVISED MARCH 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The LMR14050 is a step down DC-to-DC regulator. It is typically used to convert a higher DC voltage to a lower
DC voltage with a maximum output current of 5 A. The following design procedure can be used to select
components for the LMR14050. This section presents a simplified discussion of the design process.
9.2 Typical Application
The LMR14050 only requires a few external components to convert from wide voltage range supply to a fixed
output voltage. A schematic of 5 V/5 A application circuit is shown in Figure 21. The external components have
to fulfill the needs of the application, but also the stability criteria of the device’s control loop.
7 V to 36 V
CIN
VIN
CBOOT
BOOT
RT
CSS
EN
SW
RT/SYNC
FB
SS
GND
L
5V/5A
COUT
D
RFBT
RFBB
Figure 21. Application Circuit, 5V Output
9.2.1 Design Requirements
This example details the design of a high frequency switching regulator using ceramic output capacitors. A few
parameters must be known in order to start the design process. These parameters are typically determined at the
system level:
Input Voltage, V_IN
Output Voltage, V_OUT
Maximum Output Current I_{O_MAX}
Transient Response 0.5 A to 5 A
Output Voltage Ripple
Input Voltage Ripple
Switching Frequency f_SW
Soft-start time
7 V to 36 V, Typical 12 V
5.0 V
5A
5%
50 mV
400 mV
300 kHz
5 ms
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