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LT1769 - 典型应用图例：
LT1769典型应用图例一
LT1769 - 封装图解：
LT1769封装图解一
LT1769封装图解二
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LINEAR产品 - LT1769介绍

LT1769 - LT1769是Constant-Current/Constant-Voltage 2A BatteryCharger with Input Current Limiting

LT1769是LINEAR凌力尔特公司的一款开关充电器产品，LT1769是LT1769是Constant-Current/Constant-Voltage 2A BatteryCharger with Input Current Limiting，本站介绍了LT1769的封装应用图解、特点和优点、功能等，并给出了与LT1769相关的LINEAR元器件型号供参考。

LT1769 - LT1769是Constant-Current/Constant-Voltage 2A BatteryCharger with Input Current Limiting - 开关充电器 - 电源管理 - 凌力尔特

LT1769 - Constant-Current/Constant-Voltage 2A BatteryCharger with Input Current Limiting

LT1769 - Constant-Current/Constant-Voltage 2A BatteryCharger with Input Current Limiting - Linear Technology（凌力尔特）

功能描述
The LT1769 current mode PWM battery charger is a simple, efficient solution to fast charge modern rechargeable batteries including lithium-ion (Li-Ion), nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd) that require constant-current and/or constant-voltage charging. The internal switch is capable of delivering 2A** DC current (3A peak current). Charge current can be programmed by resistors or a DAC to within 5%. With 0.5% reference voltage accuracy, the LT1769 meets the critical constant-voltage charging requirement for Li-Ion cells.

A third control loop is provided to regulate the current drawn from the input AC adapter. This allows simultaneous operation of the equipment and battery charging without overloading the adapter. Charge current is reduced to keep the adapter current below specified levels.

The LT1769 can charge batteries ranging from 1V to 20V. Ground sensing of current is not required and the battery’s negative terminal can be tied directly to ground. A saturating switch running at 200kHz gives high charging efficiency and small inductor size. A blocking diode is not required between the chip and the battery because the chip goes into sleep mode and drains only 3µA when the wall adapter is unplugged.

特点
  • Simple Solution to Charge NiCd, NiMH and Lithium Rechargeable Batteries—Charging Current Programmed by Resistors or DAC
  • Adapter Current Limit Allows Maximum Possible Charging Current During System Use*
  • Precision 0.5% Accuracy for Voltage Mode Charging
  • High Efficiency Current Mode PWM with 3A Internal Switch
  • 5% Charge Current Accuracy
  • Adjustable Undervoltage Lockout
  • Automatic Shutdown When AC Adapter is Removed
  • Low Reverse Battery Drain Current: 3µA
  • Current Sensing Can Be at Either Terminal of the Battery
  • Charging Current Soft Start
  • Shutdown Control
  • Available in 20-Lead Exposed Pad TSSOP and 28-Lead Narrow SSOP Packages
    • 应用
  • Chargers for NiCd, NiMH, Lead-Acid, Lithium Rechargeable Batteries
  • Switching Regulators with Precision Current Limit
    • 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)
    LT1769CFE TSSOP-20 C $6.03 $5.10
    LT1769CFE#PBF TSSOP-20 C $6.03 $5.10
    LT1769CFE#TR TSSOP-20 C $5.22
    LT1769CFE#TRPBF TSSOP-20 C $5.22
    LT1769CGN SSOP-28 C $5.60 $4.95
    LT1769CGN#PBF SSOP-28 C $5.60 $4.95
    LT1769CGN#TR SSOP-28 C $5.05
    LT1769CGN#TRPBF SSOP-28 C $5.05
    LT1769IFE TSSOP-20 I $6.63 $5.60
    LT1769IFE#PBF TSSOP-20 I $6.63 $5.60
    LT1769IFE#TR TSSOP-20 I $5.72
    LT1769IFE#TRPBF TSSOP-20 I $5.72
    LT1769IGN SSOP-28 I $6.80 $6.00
    LT1769IGN#PBF SSOP-28 I $6.80 $6.00
    LT1769IGN#TR SSOP-28 I $6.10
    LT1769IGN#TRPBF SSOP-28 I $6.10
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  • LT3652HV - 功率跟踪 2A 电池充电器
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  • LT3796 - 具双电流检测的 100V 恒定电流和恒定电压控制器
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