主页 电源管理 AC/DC & DC/DC converters (integrated FET)
主页
电源管理
AC/DC & DC/DC converters (integrated FET)

LM3281

正在供货

3.3V、1.2A、6MHz 微型降压直流/直流转换器

立即订购
数据表

LM3281

正在供货
数据表 立即订购

产品详情

Iout (max) (A) 1.2 Vin (min) (V) 3 Vin (max) (V) 5.5 Type Converter Switching frequency (min) (kHz) 5400 Switching frequency (max) (kHz) 6600
Iout (max) (A) 1.2 Vin (min) (V) 3 Vin (max) (V) 5.5 Type Converter Switching frequency (min) (kHz) 5400 Switching frequency (max) (kHz) 6600
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.).
open-in-new 查找其他 AC/DC & DC/DC converters (integrated FET)
下载 观看带字幕的视频 视频

技术文档

star =有关此产品的 TI 精选热门文档
未找到结果。请清除搜索并重试。
查看全部 2
类型 标题 下载最新的英语版本 日期
* 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
用户指南 Using the LM3281 Evaluation Module 2014年 11月 24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）。

评估板

LM3281EVM — LM3281EVM 具有模拟旁路模式的 1.2A、3.3V 微型降压 DC-DC 转换器

LM3281EVM 有助于评估 LM3281 1.2A 3.3V 微型降压直流/直流转换器 IC。此转换器是一种高效低噪声降压转换器，经专门优化，适合为噪声敏感型无线连接芯片组和射频前端模块 (FEM) 供电。独特的模拟旁路功能可保持对于最大输入电压范围的调整，直至由于输入电压低于调整目标而出现完全旁路。旁路模式还可提供 60mv 典型值 (600mA) 的极低压差。极低静态电流使得 LM3281 非常适合“始终运行”的应用，而其较小的解决方案尺寸对于空间受限的移动应用非常具有吸引力。此 EVM 板上提供标准的香蕉插孔来方便评估。

用户指南: PDF
TI.com 上无现货
参考设计

TIDA-00718 — 用于 CMOS 图像传感器的小型、低噪声、高 PSRR 电源参考设计

TIDA-00718 参考设计提供小尺寸和高强度的输入电压纹波抑制电源，从而为 CMOS 图像传感器提供稳定的电压源。在该设计中，将来自电池的 5V 主电源轨、以太网供电 (PoE) 或直流适配器向下调节至三个电压轨：3.3V、1.8V 和 1.2V。

可以在消费类电子产品和商业应用中将该解决方案用作 IP 网络摄像机、模拟安全摄像机、可视门铃、互联网摄像头等。

设计指南: PDF
原理图: PDF
参考设计

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

TIDA-00532 是一种适用于 WLAN 应用的小型高效率低噪声电源。
设计指南: PDF
原理图: PDF
封装 引脚 下载
DSBGA (YFQ) 6 查看选项
应遵守 TI 评估类商品的标准条款与条件。

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

支持和培训

视频