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reference designLMG708B0-EVM12V | Demoboard LMG708B0-EVM12V

Texas Instruments LMG708B0-EVM12V | Demoboard LMG708B0-EVM12V

5V to 80V, 20A synchronous step-down converter with integrated GaN FETs for ultra-high efficiency

Overview

TopologyBuck Converter
Input voltage24-72 V
Switching frequency320-480 kHz
Output 112.1 V / 20 A

Description

The LMG708B0-EVM12V evaluation module (EVM) is designed to illustrate the synchronous GaN step-down converter LMG708B0. The EVM operates over an input voltage range of 24 V to 72 V to provide a regulated 12 V output of up to 20 A.

Features

  • Maximum input voltage of 72V– VIN UVLO thresholds set at 21V (on), 19V (off)
  • Regulated output voltage of 12V rated at 20A
  • GaN buck converter enables ultra-high efficiency– 97% at 48VIN, 12VOUT, 20A, 400kHz– Low dead-time switching minimizes power lossand temperature rise– Bias power derived from the 12V output
  • Switching frequency of 400kHz synchronizable±20% with an external clock signal
  • Input π-stage EMI filter helps meet CISPR 32– Spread spectrum (DRSS) option for lowerelectromagnetic interference (EMI)– Electrolytic capacitor for parallel damping
  • Peak current-mode control architecture providesfast line and load transient response– Optional constant-current (CC) loop withadjustable setpoint (ISET) and seamlesstransition between CV and CC modes– Forced PWM (FPWM) or pulsed frequencymodulation (PFM) modes of operation
  • Integrated protection features for robust design– Overcurrent protection (OCP) with low-lossshunt current sensing– Monotonic prebias output voltage start-up– Internal soft-start time set to 2.75ms, adjustablewith the VSET input– Power-good (PG) indicator– Current monitor (IMON) output
  • Fully assembled, tested and proven PCB layoutwith 3.9" × 2.5" (99mm × 63mm) total footprint

Typical applications

  • Industrial: factory automation and control, robotics
  • Personal electronics: computer peripherals
  • Enterprise systems: high-performance computing
  • Communications systems: wireless infrastructure

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
Screw
Wire Cross Section(mm²)
L(µH)
IRP,40K(A)
ISAT,30%(A)
RDC typ.(mΩ)
RDC max.(mΩ)
fres(MHz)
Mount
W(mm)
H(mm)
Ti
Tl(mm)
Pins
SamplesAvailability & Sample
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5580510
SPECWA-CLUG Tubular Cable Lugs, M5, 10 mm²
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWA-CLUG Tubular Cable Lugs
ScrewM5 
Wire Cross Section10 mm²
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Width12 mm
Height1.8 mm
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74655095
SPECWP-THRBU REDCUBE THR with internal through-hole thread, –, –
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWP-THRBU REDCUBE THR with internal through-hole thread
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MountTHR 
Width10 mm
Height4 mm
Inner ThreadM5 
Thread Length3.5 mm
Pins8 
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744393465033
SPECWE-XHMI SMT Power Inductor, –, –
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Downloads9 files

Status Newi| Product is new in our portfolio and production is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
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Inductance3.3 µH
Performance Rated Current20.4 A
Saturation Current @ 30%15.6 A
DC Resistance6 mΩ
DC Resistance6.5 mΩ
Self Resonant Frequency21 MHz
MountSMT 
Width6.4 mm
Height6.1 mm
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744393605022
SPECWE-XHMI SMT Power Inductor, –, –
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Downloads9 files

Status Newi| Product is new in our portfolio and production is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
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Inductance2.2 µH
Performance Rated Current29.5 A
Saturation Current @ 30%42.5 A
DC Resistance1.9 mΩ
DC Resistance2.6 mΩ
Self Resonant Frequency26 MHz
MountSMT 
Width10 mm
Height10 mm
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744393605033
SPECWE-XHMI SMT Power Inductor, –, –
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Downloads9 files

Status Newi| Product is new in our portfolio and production is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
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Inductance3.3 µH
Performance Rated Current28.7 A
Saturation Current @ 30%41.5 A
DC Resistance2.7 mΩ
DC Resistance3.4 mΩ
Self Resonant Frequency20 MHz
MountSMT 
Width10 mm
Height10 mm
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744393605047
SPECWE-XHMI SMT Power Inductor, –, –
Simu­lation
Availability
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Downloads9 files

Status Newi| Product is new in our portfolio and production is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
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Inductance4.7 µH
Performance Rated Current27.9 A
Saturation Current @ 30%28 A
DC Resistance3.8 mΩ
DC Resistance4.5 mΩ
Self Resonant Frequency15 MHz
MountSMT 
Width10 mm
Height10 mm
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