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IC manufacturers Texas Instruments

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reference designLM5122ZA

Texas Instruments LM5122ZA

3-V to 65-V wide VIN, current mode synchronous boost controller with multiphase capability

Overview

TopologyFlyback Converter
Input voltage4.5-65 V
Switching frequency50-1000 kHz
Output 124 V / 4.5 A
IC revisionA

Description

The LM5122ZA is a multi-phase capable synchronous boost controller intended for high-efficiency synchronous boost regulator applications. The control method 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 1 MHz. Higher efficiency is achieved by two robust N-channel 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 180° 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

  • Maximum Input Voltage: 65 V
  • Minimum Input Voltage: 3 V (4.5 V for Start-Up)
  • Output Voltage up to 100 V
  • Bypass (VOUT = VIN) Operation
  • 1.2-V Reference with ±1% Accuracy
  • Free-Run and 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
  • Multi-phase Capability
  • Thermally Enhanced 24-Pin HTSSOP

Typical applications

  • 12-V, 24-V, and 48-V Power Systems, Audio Power Supply, High-Current Boost Power Supply
  • Wireless Infrastructure

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L1(µH)
L2(µH)
IR(A)
IR 2(A)
ISAT(A)
RDC1 typ(mΩ)
RDC2 typ(mΩ)
RDC1 max(mΩ)
RDC2 max(mΩ)
SamplesAvailability & Sample
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744851101
SPECWE-DCT Toroidal Double Power Choke, 10 µH, 10 µH
Simu­lation
Availability
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Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-DCT Toroidal Double Power Choke
Inductance 110 µH
Inductance 210 µH
Rated Current5.3 A
Rated Current 25.3 A
Saturation Current8 A
DC Resistance 118.4 mΩ
DC Resistance 218.4 mΩ
DC Resistance 122 mΩ
DC Resistance 222 mΩ
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