The LT1505CG#PBF is a PWM constant-current/voltage high efficiency Battery Charger that charges fast multiple battery chemistries including Li-ion (Li-ion), nickel-metal-hydride (NiMH) and nickel-cadmium (NiCd) using constant-current or constant-voltage control. Maximum current can be easily programmed by resistors or a DAC. The constant-voltage output can be selected for 3 or 4 series Li-ion cells with 0.5% accuracy. A third control loop limits the current drawn from the AC adapter during charging. This allows simultaneous operation of the equipment and fast battery charging without overloading the AC adapter. The LT1505 can charge batteries ranging from 2.5V to 20V with dropout voltage as low as 0.5V. Synchronous N-channel FETs switching at 200kHz give high efficiency and allow small inductor size. A diode is not required in series with the battery because the charger automatically enters a 10μA sleep mode when the wall adapter is unplugged.
- Simple charging of Li-ion, NiMH and NiCd batteries
- Very high efficiency up to 97%
- Precision 0.5% charging voltage accuracy
- 5% Charging current accuracy
- Charging current programmed by resistor or DAC
- AC adapter current limit maximizes charging rate
- Flag indicates Li-ion charge completion
- Auto shutdown with adapter removal
- Only 10μA battery drain when idle
- Synchronizable up to 280kHz
计算机和计算机周边, 便携式器材, 消费电子产品, 电源管理
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