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）

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.

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

Chargers for NiCd, NiMH, Lead-Acid, Lithium Rechargeable Batteries

Switching Regulators with Precision Current Limit

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

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 - 32V_IN、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

• LTC1250 - LTC1250是Very Low Noise Zero-Drift Bridge Amplifier
• LTC1706-82 - LTC1706-82是VID Voltage Programmer for Intel VRM9.0/9.1
• LT1009CMS8 - LT1009CMS8是2.5V 基准
• LTC2493 - LTC2493是具 Easy Drive 输入电流抵消功能和 I2C 接口的 24 位、2 通道 / 4 通道 ΔΣ ADC
• LTC1657L - LTC1657L是并行 16 位轨至轨微功率 DAC
• RH117K - RH117K是Positive Adjustable Regulator
• LTC2755B-16 - LTC2755B-16是具并行 I/O 的四通道电流输出 12 位 SoftSpan DAC
• LTC5800-IPRA - LTC5800-IPRA是SmartMesh IP 网络管理器 2.4GHz 802.15.4e 无线管理器
• LTC5544 - LTC5544是4GHz 至 6GHz、高动态范围、下变频混频器
• LTC1407A - LTC1407A是具停机功能的串行、12 位、3Msps 同时采样 ADC