LTC3240

量产

3.3V/2.5V 升压/降压型充电泵 DC/DC 转换器

数据手册 产品选型表
产品技术资料帮助

ADI公司所提供的资料均视为准确、可靠。但本公司不为用户在应用过程中侵犯任何专利权或第三方权利承担任何责任。技术指标的修改不再另行通知。本公司既没有含蓄的允许，也不允许借用ADI公司的专利或专利权的名义。本文出现的商标和注册商标所有权分别属于相应的公司。
Viewing:

概述

  • 升压/降压型充电泵产生了固定的 3.3V 或 2.5V 输出
  • VIN 范围：1.8V 至 5.5V
  • 输出电流高达 150mA
  • 自动模式切换
  • 在升压模式中执行恒定频率 (1.2MHz) 操作
  • 在降压模式中执行低压差稳压器操作
  • 低无负载静态电流：IQ = 65µA
  • 内置软起动功能可减小涌入电流
  • 停机功能可使负载与输入断接
  • 停机电流 < 1µA
  • 短路/热保护
  • 采用 6 引脚 (2mm x 2mm) DFN 封装

LTC®3240-3.3/LTC3240-2.5 是升压/降压型充电泵 DC/DC 转换器，可在很宽的输入电压范围内 (1.8V 至 5.5V) 产生一个固定的已调输出电压 (3.3V 或 2.5V)。

当输入电压高于已调输出电压时，LTC3240 起一个低压差稳压器的作用。一旦输入电压降至比已调输出电压高出的幅度不到 100mV 时，该器件将自动切换至升压模式。在升压模式中，LTC3240 起一个恒定频率 (1.2MHz) 倍压充电泵的作用。

LTC3240-3.3/LTC3240-2.5 具有很低的无负载工作电流 (典型值为 65µA)，并在停机模式中具有超低的工作电流 (< 1µA)。内置软起动电路可防止在启动期间产生过大的涌入电流。热停机和电流限制电路使得该器件能够承受 VOUT 至 GND 的连续短路。

LTC3240-3.3/LTC3240-2.5 仅需 3 个纤巧的外部陶瓷电容器，以实现超小的应用占板面积。LTC3240-3.3/LTC3240-2.5 采用 6 引脚 (2mm x 2mm) DFN 封装。

Applications

  • 两节 AA 电池至 2.5V
  • 2 - 3 节 AA 电池/锂离子电池至 3.3V
  • 面向众多手持式产品中的照相机、I/O 电源、音频、PC 卡、各种逻辑电路等的低功率电源
LTC3240
3.3V/2.5V 升压/降压型充电泵 DC/DC 转换器
Li-Ion to 3.3V at Up to 150mA Output Voltage vs Input Voltage (Full Range) Product Package 1
添加至 myAnalog

将产品添加到myAnalog 的现有项目或新项目中（接收通知）。

创建新项目
提问

参考资料

数据手册 1

可靠性数据 1

用户手册 1

技术文章 1

了解更多
添加至 myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

创建新项目

软件资源

找不到您所需的软件或驱动?

申请驱动/软件

工具及仿真模型

LTspice 2

LTspice中提供以下器件型号：

  • LTC3240-2.5
  • LTC3240-3.3
LTspice

LTspice®是一款强大高效的免费仿真软件、原理图采集和波形观测器，为改善模拟电路的仿真提供增强功能和模型。

评估套件

eval board
schematic 1
DC903A-B

LTC3240EDC-2.5 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 2.5V @ Up to 150mA

立即购买 更多内容

产品详情

Demonstration circuit 903 is a step-up/step-down charge pump dc-dc converter. It comes with two assembly versions, DC903A-A and DC903A-B featuring the 150mA output current LTC3240-3.3 (3.3V output) and LTC3240-2.5 (2.5V output) respectively, each in a tiny 2mm x 2mm DFN package. The DC903A-A and DC903A-B operate with an input voltage from 1.8V to 5.5V.


When using the DC903A-A, the output current can reach up to 150mA when the input voltage is above 2.5V. The maximum output current of the DC903A-B is 60mA with a 1.8V input voltage. The DC903A optimizes the output efficiency by operating in the LDO step-down mode during the time the input is higher than the output voltage. When the input voltage drops low enough, The LTC3240 automatically switches to charge-pump doubling mode to extend system run-time. Built-in soft-start limits inrush current at turn-on, and short-circuit current limit/thermal protection help the part survive a continuous short-circuit.


Additionally, the DC903A features Automatic Burst Mode operation at light load to achieve low supply current (65µA, no load).

eval board
schematic 2
DC903A-A

LTC3240EDC-3.3 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 3.3V @ Up to 150mA

立即购买 更多内容

产品详情

Demonstration circuit 903 is a step-up/step-down charge pump dc-dc converter. It comes with two assembly versions, DC903A-A and DC903A-B featuring the 150mA output current LTC3240-3.3 (3.3V output) and LTC3240-2.5 (2.5V output) respectively, each in a tiny 2mm x 2mm DFN package. The DC903A-A and DC903A-B operate with an input voltage from 1.8V to 5.5V.


When using the DC903A-A, the output current can reach up to 150mA when the input voltage is above 2.5V. The maximum output current of the DC903A-B is 60mA with a 1.8V input voltage. The DC903A optimizes the output efficiency by operating in the LDO step-down mode during the time the input is higher than the output voltage. When the input voltage drops low enough, The LTC3240 automatically switches to charge-pump doubling mode to extend system run-time. Built-in soft-start limits inrush current at turn-on, and short-circuit current limit/thermal protection help the part survive a continuous short-circuit.


Additionally, the DC903A features Automatic Burst Mode operation at light load to achieve low supply current (65µA, no load).

DC903A-B
LTC3240EDC-2.5 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 2.5V @ Up to 150mA
DC903A-A - Schematic
DC903A-A
LTC3240EDC-3.3 Demo Board | Regulated Buck-Boost Charge Pump, 1.8V ≤ VIN ≤ 5.5V, VOUT = 3.3V @ Up to 150mA
DC903A-A - Schematic

最新评论

需要发起讨论吗？ 没有关于 LTC3240的相关讨论？是否需要发起讨论？

在EngineerZone®上发起讨论

近期浏览