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LM5121

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具有断开开关控制的 3V 至 65V 宽输入电压、电流模式同步升压

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LM5121

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产品详情

Rating Catalog Topology Boost, Flyback, Forward, SEPIC Vin (max) (V) 65 Vin (min) (V) 3 Vout (max) (V) 100 Vout (min) (V) 3 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light-load efficiency, Synchronous rectification, UVLO adjustable Duty cycle (max) (%) 100 Iq (typ) (A) 0.004 Operating temperature range (°C) -40 to 125
Rating Catalog Topology Boost, Flyback, Forward, SEPIC Vin (max) (V) 65 Vin (min) (V) 3 Vout (max) (V) 100 Vout (min) (V) 3 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light-load efficiency, Synchronous rectification, UVLO adjustable Duty cycle (max) (%) 100 Iq (typ) (A) 0.004 Operating temperature range (°C) -40 to 125
HTSSOP (PWP) 20 41.6 mm² (6.5 mm × 6.4 mm)
  • AEC-Q100 Qualified with the following results:
    • Device Temperature Grade 1: –40°C to +125°C
      Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C6
  • 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 up to 1 MHz
  • Peak Current Mode Control
  • Robust Integrated 3-A Gate Drivers
  • Adaptive Dead-Time Control
  • Optional Diode Emulation Mode
  • Programmable Cycle-by-Cycle Current Limit
  • 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
  • Supports External VCC Bias Supply Option
  • Load Disconnection in Shutdown Mode (True
    Shutdown)
  • Inrush Current Limiting
  • Hiccup Mode Short Circuit/Overload Protection
  • Circuit Breaker Function
  • Capable of Input Transient Suppression
  • Capable of Reverse Battery Protection
  • Thermally Enhanced 20-Pin HTSSOP
  • AEC-Q100 Qualified with the following results:
    • Device Temperature Grade 1: –40°C to +125°C
      Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C6
  • 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 up to 1 MHz
  • Peak Current Mode Control
  • Robust Integrated 3-A Gate Drivers
  • Adaptive Dead-Time Control
  • Optional Diode Emulation Mode
  • Programmable Cycle-by-Cycle Current Limit
  • 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
  • Supports External VCC Bias Supply Option
  • Load Disconnection in Shutdown Mode (True
    Shutdown)
  • Inrush Current Limiting
  • Hiccup Mode Short Circuit/Overload Protection
  • Circuit Breaker Function
  • Capable of Input Transient Suppression
  • Capable of Reverse Battery Protection
  • Thermally Enhanced 20-Pin HTSSOP

The LM5121 is a synchronous boost controller intended for high-efficiency, high-power 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 using two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions.

The LM5121 provides disconnection switch control which completely disconnects the output from the input during an output short or a shutdown condition. During start-up sequence, inrush current is limited by the disconnection switch control.

An internal charge pump allows 100% duty cycle operation of the high-side synchronous switch (Bypass operation). Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.

The LM5121 is a synchronous boost controller intended for high-efficiency, high-power 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 using two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions.

The LM5121 provides disconnection switch control which completely disconnects the output from the input during an output short or a shutdown condition. During start-up sequence, inrush current is limited by the disconnection switch control.

An internal charge pump allows 100% duty cycle operation of the high-side synchronous switch (Bypass operation). Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.
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顶层文档 类型 标题 格式选项 下载最新的英语版本 日期
* 数据表 LM5121/-Q1 Wide Input Synchronous Boost Controller with Disconnection Switch Control 数据表 (Rev. C) PDF | HTML 2016-6-14
模拟设计期刊 Designing the front-end DC/DC conversion stage to withstand automotive transient 2017-1-18
应用手册 Designing Fault Protection Circuits Using Wide VIN LM5121 2015-1-12
白皮书 How to design boost, SEPIC or flyback regulators with wide VIN power ICs 2014-7-29
应用手册 Practical Feedback Loop Analysis for Current-Mode Boost Converter 2014-3-7
应用手册 Automated Frequency Response Analyzer 2013-10-9

设计与开发

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评估板

LM5121EVM — 带断开开关评估模块的宽输入电压同步升压控制器

The LM5121EVM evaluation module (EVM) provides the design engineer with a fully functional synchronous boost converter to evaluate the Texas Instruments LM5121 synchronous boost controller IC including disconnection switch control. The EVM provides 12V output at up to 2A current from a 3.0V (5.7V (...)
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仿真模型

LM5121 PSpice Transient Model (Rev. A)

SNVM505A.ZIP (115 KB) - PSpice 模型
支持的产品和硬件
仿真模型

LM5121 TINA-TI Transient Reference Design

SNVMA48.TSC (192 KB) - TINA-TI 参考设计
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仿真模型

LM5121 TINA-TI Transient Spice Model (Rev. A)

SNVMA47A.ZIP (53 KB) - TINA-TI Spice 模型
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仿真模型

LM5121 Unencrypted PSpice Transient Model

SNVM962.ZIP (7 KB) - PSpice 模型
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参考设计

PMP11422 — 高密度 72W 电池供电型同步升压参考设计

PMP11422 是一款采用 LM5121 控制器的同步升压电源。该设计接受 5Vin 至 8.6Vin 的输入电压，并对能够提供 6A 连续电流的 12Vout 电源轨进行升压。LM5121 集成了输入断开开关功能，可实现升压短路保护，并且在发生短路事件时关闭开关。

支持的产品和硬件
参考设计

PMP8673 — 采用 LM5121 的 150W 升压转换器参考设计

PMP8673 参考设计是一款经过优化可实现高效率的同步升压转换器，同时保持小巧的外形。该参考设计的电压输入范围为 34.5V 至 37.5V（标称值 35V），可提供 55.5V 的输出电压。同步升压拓扑可在 2A 至 3A 负载范围内实现 97% 以上的效率。开关频率设置为 400kHz，从而允许使用更小的外部元件和小于 60 平方厘米的总电路板面积。

支持的产品和硬件
参考设计

PMP9297 — 适用于 GaN 音频应用的 150W 双通道同步升压

PMP9297 是一种适用于 GaN 音频放大器应用的双通道同步升压拓扑。它将 35V 输入转换为 38V 至 55V 可调节输出，每通道功率为 150W。解决方案的尺寸适合 45mm x 34mm 电路板面积。在解决方案尺寸区域之外还包含额外输入和输出大容量电容器。此设计使用 TLP0202 双通道数字电位器，通过 SPI 总线对输出电压进行编程。LMP8481-S 高侧电流检测放大器可以实现输出电流监测。NTC 热敏电阻支持测量高侧 MOSFET 的温度
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封装 引脚 CAD 符号、封装和 3D 模型
HTSSOP (PWP) 20 Ultra Librarian
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