- 您现在的位置：买卖IC网 > PDF目录15996 > LT1571EGN-5#TR (Linear Technology)IC CHARGER BATT CONST V/I 16SSOP PDF资料下载
参数资料
| 型号： | LT1571EGN-5#TR |
| 厂商： | Linear Technology |
| 文件页数： | 11/16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
For example, if 10% threshold is needed for the 1A charger
(see Figure 4), then with R PROG = 4.93k:
R 3 =
( R4 )( V BAT ? 2. 465 )
2 . 465
R CAP =
1.331 ? 4 .93k
0 . 20 – 0 . 10
= 65 . 6 k
Lithium-ion batteries typically require float voltage accu-
racy of 1% to 2%. Accuracy of the LT1571-1 V FB voltage
is ± 0.5% at 25 ° C and ± 1% over full temperature. This
Because of low level errors, as the threshold level is
reduced, the accuracy is also reduced. It is not recom-
mended to program a level less than 7.5%.
Preset Battery Voltage Settings
The LT1571-2 operates at 200kHz and is preset for 8.2V
battery voltage with SELECT pin floating and 8.4V with
SELECT pin grounded.
The LT1571-5 operates at 500kHz and is preset for 4.1V
battery voltage with SELECT pin floating and 4.2V with
SELECT pin grounded.
BAT2 pin is for Kelvin sensing the battery voltage and
should be connected to the battery.
Other Battery Voltage Settings
For battery voltages other than the preset voltages, the
LT1571-1 should be used. It operates at 200kHz and the
battery voltage is programmed with R3 and R4 divider at
V FB pin (Figure 6).
V BAT
leads to the possibility that very accurate (0.1%) resistors
might be needed for R3 and R4. Actually, the temperature
of the LT1571-1 rarely exceeds 50 ° C in float mode
because charge currents have tapered off to a low level, so
0.25% resistors normally provide the required level of
overall accuracy.
External Shutdown
The LT1571 can be externally shut down by pulling the V C
pin low with an open-drain N-FET, such as 2N7002. The V C
pin should be pulled below 0.6V to stop switching. When
V C is pulled below 40mV, LT1571 supply current drops to
typical 150 μ A.
Removing input power to the charger puts the LT1571 into
a sleep mode and draws only 5 μ A from the battery.
Nickel-Cadmium and Nickel-Metal-Hydride Charging
The circuit in Figure 7 uses the LT1571-1 to charge NiCd
or NiMH batteries up to 20V with charge currents of 0.5A
when Q1 is on and 50mA when Q1 is off.
For a 2-level charger, R1 and R2 are found from:
V FB
( 2000 )( 2 . 465 )
( 2 . 465 )( 2000 )
R3
LT1571-1
R4
1571 F06
Figure 6. Programming Other Battery Voltages
I BAT =
R 1 =
R PROG
I LOW
R 2 =
( 2 . 465 )( 2000 )
I HI ? I LOW
Current through the R3/R4 divider is set at a compromise
value of 25 μ A to minimize battery drain when the charger
is off. The V FB pin input current of 3nA contributes very
little output voltage error and can be neglected.
With divider current set at 25 μ A, R4 = 2.465/25 μ A = 100k
and,
All battery chargers with fast-charge rates require some
means to detect full charge in the battery and terminate the
high charge current. NiCd batteries are typically charged at
high current until the battery temperature begins to in-
crease or until the battery voltage reaches a peak and
begins to decrease (– dV/dt). This is an indication of near
full charge. The charge current is then reduced to a much
11
相关PDF资料 |
PDF描述 |
|---|---|
| MAX824MEUK+T | IC SUPERVISOR MPU SOT23-5 |
| 415-0014-030 | CABLE MCX/MCX 30" RG-178 |
| LTC4006EGN-4#TRPBF | IC CHARGER BATTERY 4A 16-SSOP |
| 415-0008-018 | CABLE SMB/SMB 18" RG-179 |
| MAX824REUK+T | IC SUPERVISOR MPU SOT23-5 |
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。