1
SNVU623B – October 2018 – Revised April 2020
Copyright © 2018–2020, Texas Instruments Incorporated
LM5143-Q1 EVM User's Guide
User's Guide
SNVU623B – October 2018 – Revised April 2020
LM5143-Q1 EVM User's Guide
With an input operating voltage as low as 3.5 V and up to 100 V as specified in
, the
LM5140/1/3/6-Q1 family of automotive synchronous buck controllers from TI provides flexibility, scalability,
and optimized solution size for a range of applications. These controllers enable DC/DC solutions with
high density, low EMI, and increased flexibility. All controllers are rated for a maximum operating junction
temperature of 150°C and have AEC-Q100 grade 1 qualification.
Table 1. Automotive Synchronous Buck DC/DC Controller Family
DC/DC
CONTROLLER
SINGLE or
DUAL
V
IN
RANGE
CONTROL METHOD
GATE DRIVE
VOLTAGE
SYNC OUTPUT
PROGRAMMABLE
DITHER
Dual
3.8 V to 65 V
Peak current mode
5 V
180° phase shift
N/A
Single
3.8 V to 65 V
Peak current mode
5 V
N/A
Yes
Single
3.8 V to 42 V
Peak current mode
5 V
N/A
Yes
Dual
3.5 V to 65 V
Peak current mode
5 V
90° phase shift
Yes
Single
5.5 V to 100 V
Voltage mode
7.5 V
180° phase shift
N/A
The
evaluation module (EVM) is a dual-channel synchronous buck DC/DC
regulator that employs synchronous rectification to achieve high conversion efficiency in a small footprint.
It operates over a wide input voltage range of 5.5 V to 36 V, providing regulated outputs of 5 V and 3.3 V.
The output voltages have better than 1% setpoint accuracy and are adjustable by modifying the feedback
resistor values, permitting the user to customize the output voltage from 2.5 V to 8 V as needed.
The module design uses the
synchronous buck controller with the following features:
•
Wide input voltage (wide V
IN
) range of 3.5 V to 65 V
•
Wide duty cycle range with low t
ON(min)
and t
OFF(min)
•
Ultra-low shutdown and no-load standby quiescent currents
•
Multi-phase capability
•
Peak current-mode control loop architecture
•
Integrated, high-current MOSFET gate drivers
•
Cycle-by-cycle overcurrent protection with programmable hiccup
•
Optional spread spectrum modulation for lower EMI
•
The free-running switching frequency of the EVM is 2.1 MHz and is synchronizable to a higher or lower
frequency if required. Moreover, a synchronization output signal (SYNCOUT) 90° phase-shifted relative to
the internal clock is available for master-slave configurations. VCC and gate drive UVLO protects the
regulator at low input voltage conditions, and EN pins for each channel support application-specific power-
up and power-down requirements.
The
is available in a 40-pin VQFNP package with 6-mm × 6-mm footprint to enable DC/DC
solutions with high density and low component count. See the
Synchronous Buck DC/DC Controller
data sheet for more information. Use the LM5143-Q1 with
to create a custom regulator design. To optimize component selection and
examine predicted efficiency performance across line and load ranges, download the
.
