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参数资料
| 型号： | LTC1734ES6#TR-4.1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PDSO6 |
| 封装： | PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 4/8页 |
| 文件大小： | 140K |
| 代理商： | LTC1734ES6#TR-4.1 |
4
LTC1734
BLOCK DIAGRA
W
OPERATIO
U
–
+
–
+
–
+
2
5
UVLO
VOLTAGE
REFERENCE
SHUTDOWN
GND
1734 BD
4
PROG
RPROG
2.5V
10
F
A1
A2
A3
1.5V
–
+
C1
2.15V
3
A
BAT
IBAT
SINGLE
Li-Ion
CELL
6
DRIVE
1
ISENSE
VCC
1
F
VIN
IBAT/1000
TEMPERATURE AND
CURRENT LIMITING
60
0.06
3
OUTPUT
DRIVER
IBAT
The LTC1734 is a linear battery charger controller. Op-
eration can best be understood by referring to the Block
Diagram. Charging begins when VCC rises above the
UVLO (Undervoltage Lockout) threshold VUVLOI and an
external current programming resistor is connected be-
tween the PROG pin and ground. When charging, the
collector of the external PNP provides the charge current.
The PNP’s emitter current flows through the ISENSE pin
and through the internal 0.06
current sense resistor.
This current is close in magnitude, but slightly more than
the collector current since it includes the base current.
Amplifier A3, along with the P-channel FET, will force the
same voltage that appears across the 0.06
resistor to
appear across the internal 60
resistor. The scale factor
of 1000:1 in resistor values will cause the FET’s drain
current to be 1/1000 of the charge current and it is this
current that flows through the PROG pin. In the constant
current mode, amplifier A2 is used to limit the charge
current to the maximum that is programmed by RPROG.
The PROG pin current, which is 1/1000 of the charge
current, develops a voltage across the program resistor.
When this voltage reaches 1.5V, amplifier A1 begins
diverting current away from the output driver, thus limit-
ing the charge current. This is the constant current mode.
The constant charge current is 1000 (1.5V/RPROG).
As the battery accepts charge, its voltage rises. When it
reaches the preset float voltage of 4.2V (LTC1734-4.2
version), a precisely divided down version of this voltage
(2.5V) is compared to the 2.5V internal reference voltage
by amplifier A1. If the battery voltage attempts to exceed
4.2V (2.5V at amplifier A1’s input) the amplifier will divert
current away from the output driver thus limiting charge
current to that which will maintain 4.2V on the battery. This
is the constant voltage mode.
When in the constant voltage mode, the 1000:1 current
ratio still holds and the voltage on the PROG pin will indi-
cate the charge current as a proportion of the maximum
current set by the current programming resistor. The bat-
tery charge current is 1000 (VPROG/RPROG) amps. This
feature allows a microcontroller with an ADC to easily
monitor charging current and if desired, manually shut
down the charger at the appropriate time.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1734LES6-4.2 | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/NiCD/NiMH 50mA to 180mA 4.2V 6-Pin TSOT-23 |
| LTC1734LES6-4.2#PBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/NiCD/NiMH 50mA to 180mA 4.2V 6-Pin TSOT-23 |
| LTC1734LES6-4.2#TR | 功能描述:IC CHARGER BATT CONSTV/I SOT23-6 RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC1734LES6-4.2#TRM | 功能描述:IC CHARGER BATT LIN LI-ION SOT23 RoHS:否 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 |
| LTC1734LES6-4.2#TRMPBF | 功能描述:IC CHARGER BATT LIN LI-ION SOT23 RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
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