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LM2831

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高频 1.5A 负载 - 降压直流/直流稳压器

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TPS628502 正在供货 采用 SOT583 封装的 2.7V 至 6V、2A 可调频率降压转换器 This product has higher efficiency, lower EMI and a smaller solution size.

产品详情

Vin (min) (V) 3 Vin (max) (V) 5.5 Vout (min) (V) 0.6 Vout (max) (V) 4.5 Iout (max) (A) 1.5 Iq (typ) (mA) 2.8 Switching frequency (min) (kHz) 550 Switching frequency (max) (kHz) 3000 Features Enable, Light Load Efficiency, Light load efficiency Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 94 Type Converter
Vin (min) (V) 3 Vin (max) (V) 5.5 Vout (min) (V) 0.6 Vout (max) (V) 4.5 Iout (max) (A) 1.5 Iq (typ) (mA) 2.8 Switching frequency (min) (kHz) 550 Switching frequency (max) (kHz) 3000 Features Enable, Light Load Efficiency, Light load efficiency Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 94 Type Converter
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8 WSON (NGG) 6 9 mm² 3 x 3
  • Space-Saving SOT-23 Package
  • Input Voltage Range of 3 V to 5.5 V
  • Output Voltage Range of 0.6 V to 4.5 V
  • 1.5-A Output Current
  • High Switching Frequencie
    • 1.6 MHz (LM2831X)
    • 0.55 MHz (LM2831Y)
    • 3 MHz (LM2831Z)
  • 130-mΩ PMOS Switch
  • 0.6-V, 2% Internal Voltage Reference
  • Internal Soft Start
  • Current Mode, PWM Operation
  • Thermal Shutdown
  • Overvoltage Protection
  • Space-Saving SOT-23 Package
  • Input Voltage Range of 3 V to 5.5 V
  • Output Voltage Range of 0.6 V to 4.5 V
  • 1.5-A Output Current
  • High Switching Frequencie
    • 1.6 MHz (LM2831X)
    • 0.55 MHz (LM2831Y)
    • 3 MHz (LM2831Z)
  • 130-mΩ PMOS Switch
  • 0.6-V, 2% Internal Voltage Reference
  • Internal Soft Start
  • Current Mode, PWM Operation
  • Thermal Shutdown
  • Overvoltage Protection

The LM2831 regulator is a monolithic, high-frequency, PWM step-down DC-DC converter in a 5-pin SOT-23 and a 6-Pin WSON package. The LM2831 provides all the active functions to provide local DC-DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM2831 is easy to use. The ability to drive 1.5-A loads with an internal 130-mΩ PMOS switch using state-of-the-art 0.5-µm BiCMOS technology results in the best power density available. The world-class control circuitry allows on-times as low as 30 ns, thus supporting exceptionally high frequency conversion over the entire 3 V to 5.5 V input operating range, down to the minimum output voltage of 0.6 V. Switching frequency is internally set to 550 kHz, 1.6 MHz, or 3 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is high, efficiencies of up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low standby current of 30 nA. The LM2831 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.

The LM2831 regulator is a monolithic, high-frequency, PWM step-down DC-DC converter in a 5-pin SOT-23 and a 6-Pin WSON package. The LM2831 provides all the active functions to provide local DC-DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM2831 is easy to use. The ability to drive 1.5-A loads with an internal 130-mΩ PMOS switch using state-of-the-art 0.5-µm BiCMOS technology results in the best power density available. The world-class control circuitry allows on-times as low as 30 ns, thus supporting exceptionally high frequency conversion over the entire 3 V to 5.5 V input operating range, down to the minimum output voltage of 0.6 V. Switching frequency is internally set to 550 kHz, 1.6 MHz, or 3 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is high, efficiencies of up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low standby current of 30 nA. The LM2831 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.

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技术文档

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类型 标题 下载最新的英语版本 日期
* 数据表 LM2831 High-Frequency 1.5-A Load — Step-Down DC-DC Regulator 数据表 (Rev. D) PDF | HTML 2015年 9月 30日
EVM 用户指南 AN-1550 LM2831X 6-Pin LLP Demo Board (Rev. A) 2013年 4月 25日

设计和开发

如需其他信息或资源,请点击以下任一标题进入详情页面查看(如有)。

仿真模型

LM2831X PSpice Transient Model

SNVM187.ZIP (192 KB) - PSpice Model
仿真模型

LM2831X Unencrypted PSpice Transient Model

SNVM853.ZIP (2 KB) - PSpice Model
仿真模型

LM2831Y PSpice Transient Model

SNVM188.ZIP (192 KB) - PSpice Model
仿真模型

LM2831Y Unencrypted PSpice Transient Model

SNVM852.ZIP (2 KB) - PSpice Model
仿真模型

LM2831Z PSpice Transient Model

SNVM189.ZIP (189 KB) - PSpice Model
仿真模型

LM2831Z Unencrypted PSpice Transient Model

SNVM851.ZIP (2 KB) - PSpice Model
模拟工具

PSPICE-FOR-TI — 适用于 TI 设计和模拟工具的 PSpice®

PSpice® for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence® 的模拟分析引擎。PSpice for TI 可免费使用,包括业内超大的模型库之一,涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

借助 PSpice for TI 的设计和仿真环境及其内置的模型库,您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案,然后再进行布局和制造,可缩短产品上市时间并降低开发成本。

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参考设计

PMP9487 — 用于信息娱乐系统中的汽车仪表板的 CISPR 25 5 类额定功率多路输出电源

PMP9487 是采用 LM5001 稳压器 IC(用作 SEPIC)、LM46002(用作降压)和 LM2831Y 稳压器 IC(用作降压)的传导 EMI 优化 (CISPR 25) 8W SEPIC 转换器,适用于广泛输入电压汽车信息娱乐仪表盘应用。此设计接受 6.5Vin 至 20Vin 输入电压,可提供 12V (250mA)、3.3V (1.2A) 和 1.8V (500mA) 输出。此器件采用小型尺寸,是使用升压转换器和线性稳压器的价格低廉且更高效的解决方案。在汽车仪表盘中,整个电源树设计只使用一个差分滤波器。
测试报告: PDF
原理图: PDF
封装 引脚 下载
SOT-23 (DBV) 5 查看选项
WSON (NGG) 6 查看选项

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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