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reference designLMG708B0 | Demoboard LMG708B0-EVM2PH

Texas Instruments LMG708B0 | Demoboard LMG708B0-EVM2PH

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

Overview

TopologyBuck Converter
Input voltage24-65 V
Output 112 V / 40 A

Description

The LMG708B0-EVM2PH evaluation module (EVM) is designed to showcase the LMG708B0 GaN synchronous buck converter. The two-phase EVM operates over an input voltage range of 24V to 65V to deliver a 12V regulated output at up to 40A.

Features

  • GaN buck converter enables ultra-high efficiency
  • 97% at 48VIN, 12VOUT, 40A, 400kHz
  • Low dead-time switching minimizes power loss and temperature rise
  • Bias power derived from the 12V output
  • Maximum input voltage of 65V
  • VIN UVLO thresholds set at 21V (on), 19V (off)
  • 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 lower electromagnetic interference (EMI)
  • Electrolytic capacitor for parallel damping
  • Peak current-mode control architecture provides fast line and load transient response
  • Optional constant-current (CC) loop with adjustable setpoint (ISET) and seamless transition between CV and CC modes
  • Forced PWM (FPWM) or pulsed frequency modulation (PFM) modes of operation
  • Integrated protection features for robust design
  • Overcurrent protection (OCP) with low-loss shunt current sensing
  • Monotonic prebias output voltage start-up
  • Internal soft-start time set to 2.7ms
  • Power-good (PG) indicator
  • Current monitor (IMON) output
  • Fully assembled, tested and proven PCB layout with 3.3" × 3.3" (84mm × 84mm) total footprint

Typical applications

  • Test and measurement, robotics, Data center compute: power distribution board with 48V input, Data center networking: optical module

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
Simu­lation–
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Downloads3 files

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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Downloads7 files

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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744393665033
SPECWE-XHMI SMT Power Inductor, –, –
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
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Inductance3.3 µH
Performance Rated Current27.9 A
Saturation Current @ 30%30 A
DC Resistance4.6 mΩ
DC Resistance5.6 mΩ
Self Resonant Frequency16 MHz
MountSMT 
Width10 mm
Height6 mm
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744393605022
SPECWE-XHMI SMT Power Inductor, –, –
Simu­lation
Availability
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Downloads9 files

Status Activei| 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, –, –
Simu­lation
Availability
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Downloads9 files

Status Activei| 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 Activei| 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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