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

LM5642

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具有振荡器同步功能的 4.5-36V、电流模式双路同步降压控制器

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LM25143 正在供货 具有超低 IQ 的 3.5V 至 42V 双路输出、可堆叠、同步降压直流/直流控制器 Optimized for radiated and conducted EMI requirements with a smaller footprint.

LM5642

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产品详情

Vin (min) (V) 4.5 Vin (max) (V) 36 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode current mode Rating Catalog Vout (min) (V) 1.236 Vout (max) (V) 34 Iq (typ) (A) 0.0011 Duty cycle (max) (%) 99
Vin (min) (V) 4.5 Vin (max) (V) 36 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Control mode current mode Rating Catalog Vout (min) (V) 1.236 Vout (max) (V) 34 Iq (typ) (A) 0.0011 Duty cycle (max) (%) 99
HTSSOP (PWP) 28 62.08 mm² 9.7 x 6.4 TSSOP (PW) 28 62.08 mm² 9.7 x 6.4
  • Two Synchronous Buck Regulators
  • 180° Out of Phase Operation
  • 200 kHz Fixed Nominal Frequency: LM5642
  • 375 kHz Fixed Nominal Frequency: LM5642X
  • Synchronizable Switching Frequency from 150 kHz to 250 kHz for the LM5642 and 200 kHz to 500 kHz for the LM5642X
  • 4.5V to 36V Input Range
  • 50 µA Shutdown Current
  • Adjustable Output from 1.3V to 90% of Vin
  • 0.04% (Typical) Line and Load Regulation Accuracy
  • Current Mode Control with or without a Sense Resistor
  • Independent Enable/Soft-start Pins Allow Simple Sequential Startup Configuration.
  • Configurable for Single Output Parallel Operation.
  • Adjustable Cycle-by-cycle Current Limit
  • Input Under-voltage Lockout
  • Output Over-voltage Latch Protection
  • Output Under-voltage Protection with Delay
  • Thermal Shutdown
  • Self Discharge of Output Capacitors when the Regulator is OFF
  • TSSOP and HTSSOP (Exposed PAD) Packages

All trademarks are the property of their respective owners.

  • Two Synchronous Buck Regulators
  • 180° Out of Phase Operation
  • 200 kHz Fixed Nominal Frequency: LM5642
  • 375 kHz Fixed Nominal Frequency: LM5642X
  • Synchronizable Switching Frequency from 150 kHz to 250 kHz for the LM5642 and 200 kHz to 500 kHz for the LM5642X
  • 4.5V to 36V Input Range
  • 50 µA Shutdown Current
  • Adjustable Output from 1.3V to 90% of Vin
  • 0.04% (Typical) Line and Load Regulation Accuracy
  • Current Mode Control with or without a Sense Resistor
  • Independent Enable/Soft-start Pins Allow Simple Sequential Startup Configuration.
  • Configurable for Single Output Parallel Operation.
  • Adjustable Cycle-by-cycle Current Limit
  • Input Under-voltage Lockout
  • Output Over-voltage Latch Protection
  • Output Under-voltage Protection with Delay
  • Thermal Shutdown
  • Self Discharge of Output Capacitors when the Regulator is OFF
  • TSSOP and HTSSOP (Exposed PAD) Packages

All trademarks are the property of their respective owners.

The LM5642 series consists of two current mode synchronous buck regulator controllers operating 180° out of phase with each other at a normal switching frequency of 200kHz for the LM5642 and at 375kHz for the LM5642X.

Out of phase operation reduces the input RMS ripple current, thereby significantly reducing the required input capacitance. The switching frequency can be synchronized to an external clock between 150 kHz and 250 kHz for the LM5642 and between 200 kHz and 500 kHz for the LM5642X. The two switching regulator outputs can also be paralleled to operate as a dual-phase, single output regulator.

The output of each channel can be independently adjusted from 1.3V to 90% of Vin. An internal 5V rail is also available externally for driving bootstrap circuitry.

Current-mode feedback control assures excellent line and load regulation and wide loop bandwidth for excellent response to fast load transients. Current is sensed across either the Vds of the top FET or across an external current-sense resistor connected in series with the drain of the top FET.

The LM5642 features analog soft-start circuitry that is independent of the output load and output capacitance making the soft-start behavior more predictable and controllable than traditional soft-start circuits.

Over-voltage protection is available for both outputs. A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage event.

The LM5642 series consists of two current mode synchronous buck regulator controllers operating 180° out of phase with each other at a normal switching frequency of 200kHz for the LM5642 and at 375kHz for the LM5642X.

Out of phase operation reduces the input RMS ripple current, thereby significantly reducing the required input capacitance. The switching frequency can be synchronized to an external clock between 150 kHz and 250 kHz for the LM5642 and between 200 kHz and 500 kHz for the LM5642X. The two switching regulator outputs can also be paralleled to operate as a dual-phase, single output regulator.

The output of each channel can be independently adjusted from 1.3V to 90% of Vin. An internal 5V rail is also available externally for driving bootstrap circuitry.

Current-mode feedback control assures excellent line and load regulation and wide loop bandwidth for excellent response to fast load transients. Current is sensed across either the Vds of the top FET or across an external current-sense resistor connected in series with the drain of the top FET.

The LM5642 features analog soft-start circuitry that is independent of the output load and output capacitance making the soft-start behavior more predictable and controllable than traditional soft-start circuits.

Over-voltage protection is available for both outputs. A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage event.
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类型 标题 下载最新的英语版本 日期
* 数据表 LM5642/42X High V, Dual Sync Buck Converter w/Oscil Sync 数据表 (Rev. K) 2013年 4月 4日
选择指南 电源管理指南 2018 (Rev. K) 2018年 7月 31日
选择指南 电源管理指南 2018 (Rev. R) 2018年 6月 25日
模拟设计期刊 Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016年 7月 21日
EVM 用户指南 AN-1292 LM5642 Evaluation Board (Rev. B) 2013年 4月 25日
应用手册 Power Management Considerations for FPGAs and ASICs 2007年 3月 22日

设计和开发

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评估板

LM5642EVAL-KIT — 具有振荡器同步的高电压、双路同步降压转换器

High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization

用户指南: PDF
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计算工具

LM5642MATHCAD-CALC — LM5642 Mathcad 设计工具

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封装 引脚 下载
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TSSOP (PW) 28 查看选项
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订购和质量

包含信息：
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息：
  • 制造厂地点
  • 封装厂地点

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