LT1307B Single Cell Micropower 600kHz PWM DC/DC Converters

The LT™1307/LT1307B are micropower, fixed frequency DC/DC converters that operate from an input voltage as low as 1V. First in the industry to achieve true current mode PWM performance from a single cell supply, the LT1307 features automatic shifting to power saving Burst Mode operation at light loads. High efficiency is maintained over a broad 100µA to 100mA load range. The LT1307B does not shift into Burst Mode operation at light loads, eliminating low frequency output ripple at the expense of light load efficiency. The devices contain a low-battery detector with a 200mV reference and shut down to less than 5µA. No load quiescent current of the LT1307 is 50µA and the internal NPN power switch handles a 500mA current with a voltage drop of just 295mV.

Unlike competitive devices, large electrolytic capacitors are not required with the LT1307/LT1307B in single cell applications. The high frequency (600kHz) switching allows the use of tiny surface mount multilayer ceramic (MLC) capacitors along with small surface mount inductors. The devices work with just 10µF of output capacitance and require only 1µF of input bypassing.

The LT1307/LT1307B are available in 8-lead MSOP, PDIP and SO packages

产品特点 Features
  • Uses Small Ceramic Capacitors
  • 50µA Quiescent Current (LT1307)
  • 1mA Quiescent Current (LT1307B)
  • Operates with VIN as Low as 1V
  • 600kHz Fixed Frequency Operation
  • Starts into Full Load
  • Low Shutdown Current: 3µA
  • Low-Battery Detector
  • 3.3V at 75mA from a Single Cell
  • Automatic Burst Mode® Operation at Light Load (LT1307)
  • Continuous Switching at Light Load (LT1307B)
  • Low VCESAT Switch: 295mV at 500mA
参数
LT1307 参数
应用
  • Pagers
  • Cordless Telephones
  • GPS Receivers
  • Battery Backup
  • Portable Electronic Equipment
  • Glucose Meters
  • Diagnostic Medical Instrumentation
典型应用图
LT1307 典型应用
LT1307B 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) *
LT1307BCMS8 MSOP 8 C $3.15  $2.40 
LT1307BCMS8#PBF MSOP 8 C $3.15  $2.40 
LT1307BCMS8#TR MSOP 8 C $2.46 
LT1307BCMS8#TRPBF MSOP 8 C $2.46 
LT1307BCS8 SO 8 C $2.75  $2.05 
LT1307BCS8#PBF SO 8 C $2.75  $2.05 
LT1307BCS8#TR SO 8 C $2.11 
LT1307BCS8#TRPBF SO 8 C $2.11 
LT1307BIS8 SO 8 I $3.50  $2.60 
LT1307BIS8#PBF SO 8 I $3.50  $2.60 
LT1307BIS8#TR SO 8 I $2.66 
LT1307BIS8#TRPBF SO 8 I $2.66 
LT1307CMS8 MSOP 8 C $3.15  $2.40 
LT1307CMS8#PBF MSOP 8 C $3.15  $2.40 
LT1307CMS8#TR MSOP 8 C $2.46 
LT1307CMS8#TRPBF MSOP 8 C $2.46 
LT1307CN8 PDIP 8 C $2.75  $2.05 
LT1307CN8#PBF PDIP 8 C $2.75  $2.05 
LT1307CS8 SO 8 C $2.75  $2.05 
LT1307CS8#PBF SO 8 C $2.75  $2.05 
LT1307CS8#TR SO 8 C $2.11 
LT1307CS8#TRPBF SO 8 C $2.11 
LT1307IS8 SO 8 I $3.50  $2.60 
LT1307IS8#PBF SO 8 I $3.50  $2.60 
LT1307B 数据手册及相关资料下载
  1. 数据手册(英文) : LT1307/LT1307B - Single Cell Micropower 600kHz PWM DC/DC Converters.PDF
  2. 应用指南 (英文) : AN67 - linear Technology Magazine Circuit Collection, Volume III.PDF
  3. 应用指南 (英文) : AN84 - linear Technology Magazine Circuit Collection, Volume IV .PDF
  4. 设计要点 (英文) : DN128 - LT1307 Single-Cell Micropower Fixed-Frequency DC/DC Converter Needs No Electrolytic Capacitors.PDF
  5. 可靠性数据 : R303 Reliability Data .PDF
  6. LT Journal : May 2002 Small, Portable Altimeter Operates from a Single Cell.PDF