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LT1977 - 典型应用图例：
LT1977典型应用图例一
LT1977典型应用图例二
LT1977 - 封装图解：
LT1977封装图解一
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LINEAR产品 - LT1977介绍

LT1977 - LT1977是High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100μA Quiescent Current

LT1977是LINEAR凌力尔特公司的一款微功率降压产品，LT1977是LT1977是High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100μA Quiescent Current，本站介绍了LT1977的封装应用图解、特点和优点、功能等，并给出了与LT1977相关的LINEAR元器件型号供参考。

LT1977 - LT1977是High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100μA Quiescent Current - 微功率降压 - 电源管理 - 凌力尔特

LT1977 - High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100μA Quiescent Current

LT1977 - High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100μA Quiescent Current - Linear Technology（凌力尔特）

功能描述

The LT1977 is a 500kHz monolithic buck switching regulator that accepts input voltages up to 60V. A high efficiency 1.5A, 0.2? switch is included on the die along with all the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability.

Innovative design techniques along with a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by employing Burst Mode operation at low currents, utilizing the output to bias the internal circuitry, and by using a supply boost capacitor to fully saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range.* Shutdown reduces input supply current to less than 1μA. External synchronization can be implemented by driving the SYNC pin with logic-level inputs. A single capacitor from the CSS pin to the output provides a controlled output voltage ramp (soft-start). The device also has a power good flag with a programmable threshold and time-out and thermal shutdown protection.

The LT1977 is available in a 16-pin TSSOP package with exposed pad leadframe for low thermal resistance. The LT1976, a 200kHz reduced switch frequency version of the LT1977, is also available. See the Applications Information section for selection criteria between the LT1976 and LT1977.

*U.S. Patent 6,498,466 and 6,531,909
**See Burst Mode Operation section for conditions

特点
  • Wide Input Range: 3.3V to 60V
  • 1.5A Peak Switch Current
  • Burst Mode Operation: 100μA Quiescent Current**
  • Low Shutdown Current: IQ < 1μA
  • Power Good Flag with Programmable Threshold
  • Load Dump Protection to 60V
  • 500kHz Switching Frequency
  • Saturating Switch Design: 0.2 Ohm On-Resistance
  • Peak Switch Current Maintained Over Full Duty Cycle Range*
  • 1.25V Feedback Reference Voltage
  • Easily Synchronizable
  • Soft-Start Capability
  • Small 16-Pin Thermally Enhanced TSSOP Package
    • 应用
  • High Voltage Power Conversion
  • 14V and 42V Automotive Systems
  • Industrial Power Systems
  • Distributed Power Systems
  • Battery-Powered Systems
    • 以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）
    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)
    LT1977EFE TSSOP-16 E $4.76 $4.00
    LT1977EFE#PBF TSSOP-16 E $4.76 $4.00
    LT1977EFE#TR TSSOP-16 E $4.12
    LT1977EFE#TRPBF TSSOP-16 E $4.12
    LT1977IFE TSSOP-16 I $5.47 $4.60
    LT1977IFE#PBF TSSOP-16 I $5.47 $4.60
    LT1977IFE#TR TSSOP-16 I $4.72
    LT1977IFE#TRPBF TSSOP-16 I $4.72
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