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LM3281

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3.3V、1.2A、6MHz 微型降压直流/直流转换器

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LM3281

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产品详情

Rating Catalog Topology Buck Iout (max) (A) 1.2 Vin (max) (V) 5.5 Vin (min) (V) 3 Vout (max) (V) 3.3 Vout (min) (V) 3.3 Features Enable, Light Load Efficiency, Light load efficiency Control mode Voltage mode Operating temperature range (°C) -30 to 90 Iq (typ) (A) 0.000015 Duty cycle (max) (%) 100
Rating Catalog Topology Buck Iout (max) (A) 1.2 Vin (max) (V) 5.5 Vin (min) (V) 3 Vout (max) (V) 3.3 Vout (min) (V) 3.3 Features Enable, Light Load Efficiency, Light load efficiency Control mode Voltage mode Operating temperature range (°C) -30 to 90 Iq (typ) (A) 0.000015 Duty cycle (max) (%) 100
DSBGA (YFQ) 6 1.4000000000000001 mm² 1.4000000000000001 x 1
  • Operates from a Single Li-Ion Cell (3 V to 5.5 V)
  • 6-MHz (typ.) PWM Switching Frequency
  • Fixed Output Voltage: 3.3 V
  • Up to 1.2-A Maximum Load Capability
  • High Efficiency: 94% (typ.) with 3.8-V VIN at 300 mA
  • Analog Bypass: 60-mV (typ.) Drop-Out at 600 mA
  • Low IQ: 16 µA typical, 25 µA maximum
  • Automatic ECO/PWM/Bypass Mode Change
  • Forced PWM Mode for Low Output-Voltage Ripple
  • Soft-Start Limits Input Current on Start-Up
  • Current Overload Protection
  • Thermal Overload Protection
  • Small Total Solution Size: < 7.5 mm2
  • Operates from a Single Li-Ion Cell (3 V to 5.5 V)
  • 6-MHz (typ.) PWM Switching Frequency
  • Fixed Output Voltage: 3.3 V
  • Up to 1.2-A Maximum Load Capability
  • High Efficiency: 94% (typ.) with 3.8-V VIN at 300 mA
  • Analog Bypass: 60-mV (typ.) Drop-Out at 600 mA
  • Low IQ: 16 µA typical, 25 µA maximum
  • Automatic ECO/PWM/Bypass Mode Change
  • Forced PWM Mode for Low Output-Voltage Ripple
  • Soft-Start Limits Input Current on Start-Up
  • Current Overload Protection
  • Thermal Overload Protection
  • Small Total Solution Size: < 7.5 mm2

The LM3281 is a high-efficiency low-noise miniature DC-DC converter optimized for powering noise-sensitive wireless connectivity chipsets and RF Front End Modules (FEMs) from a single Lithium-Ion cell. The LM3281 is ideal for “always on” applications with very low unloaded quiescent current of 16 µA (typ.).

The LM3281 steps down an input supply voltage to a fixed output voltage of 3.3 V with output current up to 1200 mA. Five different modes of operation are used to optimize efficiency and minimize battery drain. In Pulse Width Modulation (PWM) mode, the device operates at a fixed frequency of 6 MHz which minimizes RF interference when driving medium-to-heavy loads. At light load, the device automatically enters into Economy (ECO) mode with reduced quiescent current. In a low-battery voltage condition, a bypass mode reduces the voltage dropout to 60 mV (typ.) at 600 mA. If very low output voltage ripple is desired at light loads, the device can also be forced into PWM mode. Shutdown mode turns the device off and reduces battery consumption to 0.1 µA (typ.).

The LM3281 is a high-efficiency low-noise miniature DC-DC converter optimized for powering noise-sensitive wireless connectivity chipsets and RF Front End Modules (FEMs) from a single Lithium-Ion cell. The LM3281 is ideal for “always on” applications with very low unloaded quiescent current of 16 µA (typ.).

The LM3281 steps down an input supply voltage to a fixed output voltage of 3.3 V with output current up to 1200 mA. Five different modes of operation are used to optimize efficiency and minimize battery drain. In Pulse Width Modulation (PWM) mode, the device operates at a fixed frequency of 6 MHz which minimizes RF interference when driving medium-to-heavy loads. At light load, the device automatically enters into Economy (ECO) mode with reduced quiescent current. In a low-battery voltage condition, a bypass mode reduces the voltage dropout to 60 mV (typ.) at 600 mA. If very low output voltage ripple is desired at light loads, the device can also be forced into PWM mode. Shutdown mode turns the device off and reduces battery consumption to 0.1 µA (typ.).
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* 数据表 LM3281 3.3-V, 1.2-A, 6-MHz Miniature Step-Down DC-DC Converter for Wireless Connectivity Solutions 数据表 PDF | HTML 2014年 11月 24日

设计与开发

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评估板

LM3281EVM — 具有模拟旁路的 LM3281EVM 1.2A、3.3V 小型压降 DC/DC 转换器

LM3281EVM 有助于评估 LM3281 1.2A、3.3V 微型降压 DC/DC 转换器 IC。  它是一款高效低噪声降压转换器，经过优化，可为噪声敏感型无线连接芯片组和射频前端模块 (FEM) 供电。  独特的模拟旁路特性可保持针对最长输入电压范围的调节，直到由于输入电压降至调节目标以下而发生完全旁路。  旁路模式还在 600mA 下提供 60mV（典型值）的极低压降。  由于具有极低的静态电流，LM3281 成为“常开型”应用的理想之选，并且其小尺寸解决方案非常有利于空间受限的移动应用。EVM 板上提供了标准香蕉插孔，以便于评估。

用户指南: PDF
TI.com 上无现货
参考设计

TIDA-00718 — 用于 CMOS 图像传感器的小尺寸、低噪声和高 PSRR 电源参考设计

TIDA-00718 参考设计可提供小尺寸和高输入电压纹波抑制电源，为 CMOS 图像传感器提供稳定且纯净的电压源。该设计将电池、以太网供电 (PoE) 或直流适配器提供的 5V 主电源轨向下调节为三个电压轨：3.3V、1.8V 和 1.2V。

此解决方案可用作消费类电子产品和商业应用中的 IP 网络摄像头、模拟安全摄像头、可视门铃、网络摄像头等。

设计指南: PDF
原理图: PDF
参考设计

TIDA-00532 — 用于 WLAN 前端模块和收发器的高效率低噪声降压转换器参考设计

TIDA-00532 是一款适用于 WLAN 应用的微型、高效率、低噪声电源。
设计指南: PDF
原理图: PDF
封装 引脚 CAD 符号、封装和 3D 模型
DSBGA (YFQ) 6 Ultra Librarian
适用于评估类项目的 TI 标准条款与条件。

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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