LT1505 Constant-Current/Voltage High Efficiency Battery Charger

The LT®1505 PWM battery charger controller fast charges multiple battery chemistries including lithium-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. A logic output indicates Li-Ion full charge when current drops to 20% of the programmed value.

The LT1505 is available in a 28-pin SSOP package

产品特点 Features

Simple Charging of Li-Ion, NiMH and NiCd Batteries
Very High Efficiency: Up to 97%
Precision 0.5% Charging Voltage Accuracy
Preset Battery Voltages: 12.3V, 12.6V, 16.4V and 16.8V
5% Charging Current Accuracy
Charging Current Programmed by Resistor or DAC
0.5V Dropout Voltage, Duty Cycle > 99.5%
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

应用

Notebook Computers
Portable Instruments
Chargers for Li-Ion, NiMH, NiCd and Lead Acid Rechargeable Batteries

典型应用图

参数

LT1505 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LT1505CG	SSOP	28	C	$5.65	$4.80
LT1505CG#PBF	SSOP	28	C	$5.65	$4.80
LT1505CG#TR	SSOP	28	C		$4.90
LT1505CG#TRPBF	SSOP	28	C		$4.90
LT1505CG-1	SSOP	28	C	$5.15	$4.60
LT1505CG-1#PBF	SSOP	28	C	$5.15	$4.60
LT1505CG-1#TR	SSOP	28	C		$4.70
LT1505CG-1#TRPBF	SSOP	28	C		$4.70

LT1505 数据手册及相关资料下载

数据手册(英文) : LT1505 - Constant-Current/Voltage High Efficiency Battery Charger.PDF
设计要点 (英文) : DN242 - Li-Ion Charge Termination IC Interfaces with PWM Switchers.PDF
设计要点 (英文) : DN244 - Simple Li-Ion Charge Termination Using the LT1505.PDF
可靠性数据 : R324 Reliability Data .PDF