LT1769 - LT1769是Constant-Current/Constant-Voltage 2A BatteryCharger with Input Current Limiting
LT1769是Linear公司的一款开关充电器产品，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相关的凌力尔特元器件型号供参考。
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 |
下面可能是您感兴趣的Linear Technology（凌力尔特）元器件
LT1513 - SEPIC 恒定或可编程电流 / 恒定电压电池充电器LT1510 - 恒定电压 / 恒定电流电池充电器LT1512 - SEPIC 恒定电流 / 恒定电压电池充电器LT3652 - 用于太阳能电源的功率跟踪 2A 电池充电器LTC4000 - 用于电池充电和电源管理的高电压、大电流控制器LT1511 - 具输入电流限制功能的恒定电流 / 恒定电压 3A 电池充电器LT3652HV - 功率跟踪 2A 电池充电器LTC4008 - 4A、高效率的多化学组成电池充电器LTM8062 / LTM8062A - 32VIN、2A μModule 功率跟踪电池充电器LT3796 - 具双电流检测的 100V 恒定电流和恒定电压控制器
下面可能是您感兴趣的Linear公司开关充电器元器件
RH137H - RH137H是Negative Adjustable RegulatorLTC5535 - LTC5535是具有可调增益和 12MHz 基带带宽的精准 600MHz 至 7GHz、RF 检波器LTC3868-1 - LTC3868-1是低 Iq、双通道、两相、同步降压型控制器LTC3823 - LTC3823是具差分输出检测、跟踪功能和 PLL 的快速、No Rsense 降压型同步 DC/DC 控制器LT1461CIS8-3 - LT1461CIS8-3是微功率、精准、低压差、串联电压基准系列LT1024 - LT1024是Dual, Matched Picoampere, Microvolt Input, Low Noise Op AmpLTC2392-16 - LTC2392-16是具 94dB SNR 的 16 位、500ksps、SAR ADCLTC4412HV - LTC4412HV是采用 ThinSOT 封装的 36V、低损耗 PowerPath? 控制器LTM8062 - LTM8062是32VIN、2A μModule 功率跟踪电池充电器LTC2280 - LTC2280是Dual 10-Bit, 105Msps Low Noise 3V ADC
