LTC3832 High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation

The LTC®3832/LTC3832-1 are high power, high efficiency switching regulator controllers optimized for 3.3V-5V to 0.6V-3.xV step-down applications. A precision internal reference and feedback system provide ±1% output regulation over temperature, load current and line voltage variations. The LTC3832/LTC3832-1 use a synchronous switching architecture with N-channel MOSFETs. Additionally, the chip senses output current through the drain-source resistance of the upper N-channel MOSFET, providing an adjustable current limit without a current sense resistor.

The LTC3832/LTC3832-1 operate with an input supply voltage as low as 3V and with a maximum duty cycle of >91% over temperature. They include a fixed frequency PWM oscillator for low output ripple operation. The 300kHz free-running clock frequency can be externally adjusted or synchronized with an external signal from 100kHz to 500kHz. In shutdown mode, the LTC3832 supply current drops to <10µA. The LTC3832-1 is the SO-8 version without current limit, frequency adjustment and shutdown functions

产品特点 Features
  • VOUT as Low as 0.6V
  • High Power Switching Regulator Controller for 3.3V-5V to 0.6V-3.xV Step-Down Applications
  • No Current Sense Resistor Required
  • Low Input Supply Voltage Range: 3V to 8V
  • Maximum Duty Cycle >91% Over Temperature
  • All N-Channel External MOSFETs
  • Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
  • High Efficiency: Over 95% Possible
  • Adjustable or Fixed 2.5V Output (LTC3832)
  • Programmable Fixed Frequency Operation: 100kHz to 500kHz
  • External Clock Synchronization
  • Soft-Start
  • Low Shutdown Current: <10µA
  • Overtemperature Protection
  • Available in SO-8 and SSOP-16 Packages
应用
  • CPU Power Supplies
  • Multiple Logic Supply Generator
  • Distributed Power Applications
  • High Efficiency Power Conversion
典型应用图
LTC3832 典型应用
参数
LTC3832 参数
LTC3832 订购信息和价格参考Package Variations and Pricing
器件型号 封装 引脚 温度 价格 (以 1 ~ 99 片为批量) 价格 (以 1000 片为批量) *
LTC3832-1ES8 SO 8 E $4.20  $2.95 
LTC3832-1ES8#PBF SO 8 E $4.20  $2.95 
LTC3832-1ES8#TR SO 8 E $3.01 
LTC3832-1ES8#TRPBF SO 8 E $3.01 
LTC3832EGN SSOP 16 E $4.46  $3.10 
LTC3832EGN#PBF SSOP 16 E $4.46  $3.10 
LTC3832EGN#TR SSOP 16 E $3.16 
LTC3832EGN#TRPBF SSOP 16 E $3.16 
LTC3832 数据手册及相关资料下载
  1. 数据手册(英文) : LTC3832/LTC3832-1 - High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation.PDF
  2. 可靠性数据 : R320 Reliability Data .PDF