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参数资料
| 型号： | LT1571EGN-5 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Constant-Current/ Constant-Voltage Battery Charger with Preset Voltage and Termination Flag |
| 中文描述： | 2 A BATTERY CHARGE CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件页数： | 9/16页 |
| 文件大小： | 201K |
| 代理商： | LT1571EGN-5 |
9
LT1571 Series
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
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
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
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,
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
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
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:
Threshold
R
R
or
R
R
Threshold
PROG
CAP
CAP
PROG
=
=
0 20
.
– (1 331
0 20
.
)
(1 331
)
–
R
PROG
is the charge current setting resistor.
Figure 5. Reducing Charge Termination Threshold
Figure 4. 200kHz Charging Lithium Batteries (Efficiency at 1A > 87%)
SW
V
CC
PROG
4.93k
100k
V
11V
TO 26V
+
1571 F04
C1
0.22
μ
F
C
IN
*
10
μ
F
L1**
33
μ
H
LT1571-2
D1
MBRM120T3
D3
MBRM120T3
D2
MMBD914L
SELECT
SENSE
GND
CAP
C
OUT
22
F
TANT
8.4V
0.3
μ
F
0.1
μ
F
1k
1
μ
F
NOTE: COMPLETE LITHIUM-ION CHARGER, NO TERMINATION REQUIRED
*
COILTRONICS CTX33-2
BOOST
+
V
C
BAT
BAT2
FLAG
300
R
CAP
CAP
0.1
μ
F
LT1571
1571 F05
APPLICATIOU
W
U
U
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|---|---|
| LT1571-1 | CAP 47UF 4V ELECT HB SMD |
| LT1571-2 | Constant-Current/ Constant-Voltage Battery Charger with Preset Voltage and Termination Flag |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1571EGN-5#PBF | 功能描述:IC CHARGER BATT CONST V/I 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:2,000 系列:Impedance Track™ 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.4 V ~ 2.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:带卷 (TR) 产品目录页面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名称:296-21665-2 |
| LT1571EGN-5#TR | 功能描述:IC CHARGER BATT CONST V/I 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1571EGN-5#TRPBF | 功能描述:IC CHARGER BATT CONST V/I 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| 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 |
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