LT1776 - Wide Input Range, High Efficiency, Step-Down Switching Regulator

The LT®1776 is a wide input range, high efficiency Buck (step-down) switching regulator. The monolithic die includes all oscillator, control and protection circuitry. The part can accept input voltages as high as 60V and contains an output switch rated at 700mA peak current. Current mode control delivers excellent dynamic input supply rejection and short-circuit protection.

The LT1776 contains several features to enhance efficiency. The internal control circuitry is normally powered via the VCC pin, thereby minimizing power drawn directly from the VIN supply (see Applications Information). The action of the LT1776 switch circuitry is also load dependent. At medium to high loads, the output switch circuitry maintains fast rise time for good efficiency. At light loads, rise time is deliberately reduced to avoid pulse skipping behavior.

The available SO-8 package and 200kHz switching frequency allow for minimal PC board area requirements.

特点
  • Wide Input Range: 7.4V to 40V
  • Tolerates Input Transients to 60V
  • 700mA Peak Switch Rating
  • Adaptive Switch Drive Maintains Efficiency at High Load Without Pulse Skipping at Light Load
  • True Current Mode Control
  • 200kHz Fixed Operating Frequency
  • Synchronizable to 400kHz
  • Low Supply Current in Shutdown: 30µA
  • Available in 8-Pin SO and PDIP Packages
典型应用
LT1776 Typical Application
LT1776 Typical Application
应用
  • Automotive DC/DC Converters
  • Cellular Phone Battery Charger Accessories
  • IEEE 1394 Step-Down Converters
封装信息
LT1776 Package Drawing
Order Information 订购型号
器件型号封装温度价格 (以 1 ~ 99 片为批量)价格 (以 1000 片为批量) *
LT1776CN8#PBFN-8C$3.05$2.50
LT1776CS8#PBFSO-8C$3.15$2.60
LT1776CS8#TRPBFSO-8C$2.66
LT1776IN8#PBFN-8I$3.55$2.85
LT1776IS8#PBFSO-8I$3.60$3.00
LT1776IS8#TRPBFSO-8I$3.06
演示电路板
器件型号描述价格
DC204A-BLT1776CS8 | High Voltage, High Eff., Step Down Switching Regulator, 7V to 60Vin, 3.3V and 5V @ 0.5A Out (thru-hole input cap)$75.00
数据表
设计要点
可靠性数据
LT Journal
CAD 符号
相关产品
LT1776 - Wide Input Range, High Efficiency, Step-Down Switching Regulator
DN191 - The LT1776 Provides Power for the IEEE1394 Fire Wire
DN202 - 60V, High Efficiency Buck Switching Regulators in SO-8
R012 Reliability Data
Nov 1998 Wide Input Range, High Efficiency Step-Down Switching Regulators
LT1776 Footprints and Symbols