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reference designLM5122-Q1

Texas Instruments LM5122-Q1

LM5122/-Q1 Wide-Input Synchronous Boost Controller With Multiple Phase Capability

Overview

TopologyBoost Converter
Input voltage9-20 V
Switching frequency400-975 kHz
Output 124 V / 4.5 A
Output 228 V / 7 A
IC revisionG

Description

The LM5122 is a multiphase capable synchronous boost controller intended for high-efficiency synchronous boost regulator applications. The controlmethod is based upon peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation.

The switching frequency is programmable up to 1MHz. Higher efficiency is achieved by two robust Nchannel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode also enables discontinuous mode operation for improved efficiency at light load conditions.

An internal charge pump allows 100% duty cycle for high-side synchronous switch (Bypass operation). A 180º phase shifted clock output enables easy multi-phase interleaved configuration. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.

Features

  • AEC-Q100 Grade 1 (TA = –40°C to 125°C)
  • Maximum Input Voltage : 65 V
  • Min Input Voltage : 3.0 V (4.5 V for startup)
  • Output Voltage up to 100 V
  • Bypass (VOUT = VIN) Operation
  • 1.2 V Reference with ±1.0% Accuracy
  • Free-Run/Synchronizable Switching to 1 MHz
  • Peak Current Mode Control
  • Robust 3 A Integrated Gate Drivers
  • Adaptive Dead-Time Control
  • Optional Diode Emulation Mode
  • Programmable Cycle-by-Cycle Current Limit
  • Hiccup Mode Overload Protection
  • Programmable Line UVLO
  • Programmable Soft-Start
  • Thermal Shutdown Protection
  • Low Shutdown Quiescent Current: 9 µA
  • Programmable Slope Compensation
  • Programmable Skip Cycle Mode Reduces Standby Power
  • Allows External VCC Supply
  • Inductor DCR Current Sensing Capability
  • Multiphase Capability
  • Thermally Enhanced 20-Pin HTSSOP

Remarks:1)fSW2 Switching frequency 2 is choosed due to max value

2)From Figure 38. Non-Isolated Synchronous Flyback Converter Simplified SchematicOnly I/O is given, but it's a coupled inductor(transformer)

Typical applications

  • High Current Boost Power Supply
  • 12 V, 24 V, and 48 V Power Systems
  • Automotive Start-Stop
  • Audio Power Supply

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
C
Tol. C
VR(V (DC))
Size
Operating Temperature
DF(%)
RISO
Ceramic Type
L(mm)
W(mm)
H(mm)
Fl(mm)
Packaging
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Samples
885012207025
WCAP-CSGP MLCCs 10 V(DC), 4.7 µF, ±10%
Simu­lation
Downloads9 files

EDA models: Components ZIP

CAD files ZIP

Electric models ZIP

Download all 9 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 10 V(DC)
Capacitance4.7 µF
Capacitance±10% 
Rated Voltage10 V (DC)
Size0805 
Operating Temperature -55 °C up to +125 °C
Dissipation Factor10 %
Insulation Resistance0.02 GΩ
Ceramic TypeX7R Class II 
Length2 mm
Width1.25 mm
Height1.25 mm
Pad Dimension0.5 mm
Packaging7" Tape & Reel 
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74435561100
WE-HCI SMT Flat Wire High Current Inductor, –, –
Simu­lation
Downloads9 files

EDA models: Components ZIP

CAD files ZIP

Electric models ZIP

Download all 9 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
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Size1890 
Operating Temperature -40 °C up to +150 °C
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Length18.3 mm
Width18.2 mm
Height8.9 mm
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Inductance10 µH
Performance Rated Current16.5 A
Saturation Current @ 10%10 A
Saturation Current @ 30%21.5 A
DC Resistance6.9 mΩ
Self Resonant Frequency14 MHz
MaterialWE-PERM 2