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AC/DC & DC/DC controllers (external FET)

LM5121

現行

具中斷連線切換控制的 3-65V 大範圍 VIN 電流模式同步升壓

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產品規格表

LM5121

現行
產品規格表 立即訂購

產品詳細資料

Vin (min) (V) 3 Vin (max) (V) 65 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost, Flyback, Forward, SEPIC Rating Catalog Vout (min) (V) 3 Vout (max) (V) 100 Iq (typ) (A) 0.004 Duty cycle (max) (%) 100
Vin (min) (V) 3 Vin (max) (V) 65 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost, Flyback, Forward, SEPIC Rating Catalog Vout (min) (V) 3 Vout (max) (V) 100 Iq (typ) (A) 0.004 Duty cycle (max) (%) 100
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • 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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類型 標題 日期
* Data sheet LM5121/-Q1 Wide Input Synchronous Boost Controller with Disconnection Switch Control datasheet (Rev. C) PDF | HTML 2016年 6月 14日
Analog Design Journal Designing the front-end DC/DC conversion stage to withstand automotive transient 2017年 1月 18日
Application note Designing Fault Protection Circuits Using Wide VIN LM5121 2015年 1月 12日
White paper How to design boost, SEPIC or flyback regulators with wide VIN power ICs 2014年 7月 29日
Application note Practical Feedback Loop Analysis for Current-Mode Boost Converter 2014年 3月 7日
Application note Automated Frequency Response Analyzer 2013年 10月 9日
EVM User's guide LM5121EVM Evaluation Module 2013年 8月 23日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

LM5121EVM — 具有中斷連線切換的廣泛 Vin 同步升壓控制器評估模組

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 (...)
使用指南: PDF
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模擬型號

LM5121 PSpice Transient Model (Rev. A)

SNVM505A.ZIP (115 KB) - PSpice Model
下載
模擬型號

LM5121 TINA-TI Transient Reference Design

SNVMA48.TSC (192 KB) - TINA-TI Reference Design
下載
模擬型號

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

SNVMA47A.ZIP (53 KB) - TINA-TI Spice Model
下載
模擬型號

LM5121 Unencrypted PSpice Transient Model

SNVM962.ZIP (7 KB) - PSpice Model
下載
參考設計

PMP11422 — 高密度 72W 電池供電同步升壓參考設計

PMP11422 is a synchronous boost power supply using the LM5121 controllers. The design accepts an input voltage of 5Vin to 8.6Vin, and boosts a 12Vout rail capable of sourcing 6A continuous current. The LM5121 integrates an input disconnection switch feature which allows boost short circuit (...)
Test report: PDF
電路圖: PDF
參考設計

PMP10092 — 採用 LM5121 的 8V @ 7A 同步升壓參考設計

The PMP10092 reference design is a synchronous boost converter that can operate over a 3V to 8V input range and produce an 8V output at 7A load. The circuit has an output disconnection switch for safety. Due to the synchronous design a high efficiency of 97% can be achieved.
Test report: PDF
電路圖: PDF
參考設計

PMP8673 — 採用 LM5121 的 150W 升壓轉換器參考設計

The PMP8673 reference design is a synchronous boost converter optimized for high efficiency while maintaining a small form factor. This reference design has a voltage input range of 34.5-37.5V (35V nominal) and provides an output voltage of 55.5V. The synchronous boost topology enables efficiencies (...)
Test report: PDF
電路圖: PDF
參考設計

PMP9372 — 單相 60W 音訊放大器參考設計

PMP9372 is a single-phase synchronous boost converter, which utilizes the LM5121 controller. Inrush limiting is set to 11A nominal, which allows startup into a 4700μF output capacitor. The TPS3700DDC is used as an output voltage monitor, which provides Power Good signaling of output over-voltage (...)
Test report: PDF
電路圖: PDF
參考設計

PMP9297 — 適用於 GaN 音訊應用的 150W 雙通道同步升壓

PMP9297 is a dual channel synchronous boost for GaN audio amplifier applications. It converts 35V input to an adjustable 38V to 55V output at 150W per channel. The solution size fits in a 45mm x 34 mm board area. Additional input and output bulk capacitors are included outside of the solution size (...)
Test report: PDF
電路圖: PDF
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