- 您现在的位置：买卖IC网 > PDF目录15996 > LT1571EGN-5#TRPBF (Linear Technology)IC CHARGER BATT CONST V/I 16SSOP PDF资料下载
参数资料
| 型号： | LT1571EGN-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT CONST V/I 16SSOP |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 铅酸，锂离子，镍镉，镍氢 |
| 电源电压： | 8 V ~ 26 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
LT1571 Series
APPLICATIO S I FOR ATIO
Lithium-Ion Charging
The circuit in Figure 4 uses the 28-pin LT1571-2 to charge
lithium-ion batteries at a constant 1A until the battery
voltage reaches 8.4V preset battery voltage. The charger
will then automatically go into a constant-voltage mode
with current decreasing to near zero over time as the
battery reaches full charge.
Lithium-Ion Charge Completion
CAP pin to filter out the switching noise and a pull-up
resistor is also needed at FLAG pin.
Charge Termination Flag Threshold Setting
The charge termination flag threshold can be reduced
from the default 20% level to as low as 7.5% of the
programmed full charge current. This is done by adding a
resistor R CAP from the CAP pin to ground (see Figure 5).
The formula for selecting the R CAP resistor is:
Some battery manufacturers recommend termination of
constant-voltage float mode after charge current has
dropped below a specified level (typically around 10% to
20% of the full current) and a further time-out period of 30
Threshold = 0 . 20 – ( 1 . 331 )
or
R PROG
R CAP
minutes to 90 minutes has elapsed. Check with manufac-
turer for details. The LT1571 provides a signal at the FLAG
pin when the charger is in voltage mode and charge
R CAP =
( 1 . 331 ) R PROG
0 . 20 – Threshold
current has reduced to approximately 20% of full current.
Note that full current is (2.465V × 2000)/R PROG . Compara-
tor E6 in the Block Diagram compares the charge current
sample I PROG to the output current I VA voltage amplifier
VA. When the charge current drops to 20% of full current,
R PROG is the charge current setting resistor.
LT1571
CAP
I PROG will be equal to 0.25 I VA and the open-collector
output V FLAG will go low. This signal can be used to start
0.1 μ F
R CAP
an external timer or to terminate the charge. When this
feature is used, a capacitor of at least 0.1 μ F is required at
1571 F05
Figure 5. Reducing Charge Termination Threshold
D1
MBRM120T3
D3
MBRM120T3
V IN
C1
0.22 μ F
SW
LT1571-2
V CC
C IN *
10 μ F
11V
TO 26V
L1**
33 μ H
D2
MMBD914L
BOOST
PROG
0.3 μ F
1 μ F
4.93k
100k
SENSE
CAP
V C
1k
300 ?
0.1 μ F
SELECT
GND
FLAG
BAT
BAT2
+
C OUT
22 μ F
+
8.4V
TANT
NOTE: COMPLETE LITHIUM-ION CHARGER
* TOKIN OR MARCON CERAMIC SURFACE MOUNT
** COILTRONICS CTX33-2
1571 F04
Figure 4. 200kHz Charging Lithium Batteries (Efficiency at 1A > 87%)
10
相关PDF资料 |
PDF描述 |
|---|---|
| 415-0009-030 | CABLE SMB-RA/SMB-RA 30" RG-179 |
| 63RX30330MG412.5X25 | CAP ALUM 330UF 63V 20% RADIAL |
| LT1571EGN-5#TR | IC CHARGER BATT CONST V/I 16SSOP |
| MAX824MEUK+T | IC SUPERVISOR MPU SOT23-5 |
| 415-0014-030 | CABLE MCX/MCX 30" RG-178 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1572 | 制造商:LINER 制造商全称:Linear Technology 功能描述:100kHz, 1.25A Switching Regulator with Catch Diode |
| LT1572CS | 功能描述:IC REG MULTI CONFIG 1.25A 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1572CS#PBF | 功能描述:IC REG MULTI CONFIG 1.25A 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1572CS#TR | 功能描述:IC REG MULTI CONFIG 1.25A 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT1572CS#TRPBF | 功能描述:IC REG MULTI CONFIG 1.25A 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
发布紧急采购，3分钟左右您将得到回复。