概览

优势和特点

  • 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

产品详情

The LTC®1700 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 RSENSETM 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.


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

产品生命周期 icon-recommended 量产

该产品系列中至少有一个型号已量产并可供采购。该产品适合用于新设计,但也可能有更新的替代产品。

评估套件 (1)

工具及仿真模型

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。

LTspice

LTspice中提供以下器件型号:

LTC1700

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