LTC1700

量产

No RSENSE Synchronous Step-Up DC/DC Controller

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

  • High Efficiency: Up to 95%
  • No Current Sense Resistor Required
  • Constant Frequency 530kHz Operation Allows Small Size, Surface Mount Inductors
  • OPTI-LOOP® Compensation Minimizes COUT
  • Selectable Burst Mode® Operation
  • Minimum Start-Up Voltage as Low as 0.9V
  • Synchronizable Between 400kHz and 750kHz
  • Micropower Shutdown: 10µA
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Soft-Start Reduces Supply Current Transients
  • 1.5% Output Voltage Accuracy
  • Uses Low Value, Small Size, Surface Mount Inductors
  • Available in 10-Lead MSOP Package

The LTC1700 is a current mode synchronous step-up DC/DC controller that drives external N-channel and P-channel power MOSFETs using a constant frequency PWM architecture. Current limiting is provided by sensing the voltage drop across the main MOSFET, eliminating the need of a sense resistor. This No RSENSE technique helps the LTC1700 maintain high efficiency at heavy loads while Burst Mode operation ensures high efficiency at light loads, thus providing high efficiencies over a wide range of load currents.

The LTC1700 operates at a minimum input voltage as low as 0.9V. The device boasts a ±1.5% output voltage accuracy and consumes only 200µA of quiescent current. In shutdown, it only draws 10µA.

To prevent inductor current runaway, the duty cycle is limited to 90%. Overvoltage protection is also provided which shuts both the external MOSFETs off when tripped.

High constant operating frequency of 530kHz allows the use of small inductors and output capacitors. The LTC1700 can also be synchronized between 400kHz to 750kHz. Burst Mode operation is inhibited when the device is externally clocked or when the SYNC/MODE pin is pulled low to reduce noise and RF interference.

Applications

  • Cellular Telephones
  • Wireless Modems
  • RF Communications
  • 2.5V to 3.3V, 2.5V to 5V Converters
  • Battery-Powered Equipment
  • Telecom/Network Systems

LTC1700
No RSENSE Synchronous Step-Up DC/DC Controller
Figure 1. High Efficiency Step-Up Converter Efficiency, Power Loss vs Load Current 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

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

硬件生态系统

部分模型 产品周期 描述
振荡器 2
LTC6908 具扩频调制功能、采用电阻器设定频率的 SOT-23 封装振荡器
LTC6909 量产 采用扩频调制、可提供 1 至 8 个输出的多相硅振荡器
Modal heading
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

工具及仿真模型

LTspice


LTspice中提供以下器件型号:

  • LTC1700
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
DC349B

LTC1700EMS | 无 RSENSE, 2.5VIN 至 3.3VOUT (1A)或 5.0VOUT (800mA)

产品详情

演示电路DC349B展示了采用LTC1700控制器的同步升压DC/DC转换器。LTC1700是一款电流模式无RSENSE™同步升压控制器,效率可高达95%。适合的应用包括2.5V至3.3V或5V转换器、2.5V至5V转换器、单节锂离子提供5V应用或两节AA电池提供3.3V或5V应用。LTC1700的550kHz工作频率支持使用小型电感和电容。该器件还可同步至400kHz至750kHz频率。DC349B提供3.3V或5V(跳线可选)输出电压。

DC349B
LTC1700EMS | 无 RSENSE, 2.5VIN 至 3.3VOUT (1A)或 5.0VOUT (800mA)
DC349B - Schematic

最新评论

需要发起讨论吗? 没有关于 LTC1700的相关讨论?是否需要发起讨论?

在EngineerZone®上发起讨论

近期浏览