- 您现在的位置：买卖IC网 > PDF目录65797 > LTC1734ES6#TR-4.1 (LINEAR TECHNOLOGY CORP) BATTERY CHARGE CONTROLLER, PDSO6 PDF资料下载
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： | 5/8页 |
| 文件大小： | 140K |
| 代理商： | LTC1734ES6#TR-4.1 |
5
LTC1734
OPERATIO
U
APPLICATIONS INFORMATION
WU
U
When VCC is applied, the charger can be manually shut
down by floating the otherwise grounded end of RPROG.
An internal 3
A current source pulls the PROG pin above
the 2.15V threshold of voltage comparator C1 initiating
shutdown.
For charging NiMH or NiCd batteries, the LTC1734 can be
turned into a constant current source by grounding the
BAT pin. This will prevent amplifier A1 from trying to limit
charging current and only A2 will control the current.
Fault conditions such as overheating of the die or exces-
sive PNP base current drive are monitored and limited.
When input power is removed or manual shutdown is
entered, the charger will drain only tiny leakage currents
from the battery, thus maximizing battery standby time.
With VCC removed the external PNP’s base is connected to
the battery by the charger. In manual shutdown the base
is connected to VCC by the charger.
Charging Operation
Charging begins when an input voltage is present that
exceeds the undervoltage lockout threshold (VUVLOI), a
Li-Ion battery is connected to the charger output and a
program resistor is connected from the PROG pin to
ground. During the first portion of the charge cycle, when
the battery voltage is below the preset float voltage, the
charger is in the constant current mode. As the battery
voltage rises and approaches the preset float voltage, the
charge current begins to decrease and the constant
voltage portion of the charge cycle begins. The charge
current will continue to decrease exponentially as the
battery approaches a fully charged condition.
Should the battery be removed during charging, a built-in
protection circuit will prevent BAT from rising above 5V.
Manual Shutdown
Floating the program resistor shuts down the charger. In
this mode, a small current is drawn from the supply (ISMS)
while only a negligible leakage current is delivered to the
battery load (IBMS).
Sleep Mode
When the input supply is disconnected, the IC enters the
sleep mode. In this mode, the battery drain current (IBSL)
is a negligible leakage current, allowing the battery to
remain connected to the charger for an extended period of
time without discharging the battery. The leakage current
is due to the reverse-biased B-E junction of the external
PNP transistor.
Undervoltage Lockout
Undervoltage lockout (UVLO) keeps the charger off until
the input voltage exceeds a predetermined threshold level
(VUVLOI) of 4.56V. Approximately 150mV of hysteresis is
built in to prevent oscillation around the threshold level. In
undervoltage lockout, battery drain current is very low
(< 1
A).
Programming Constant Current
When in the constant current mode, the full-scale current
is programmed using a single external resistor between
the PROG pin and ground. The charge current will be 1000
times greater than the current through the program
resistor. The program resistor value is selected by divid-
ing the voltage forced across the resistor (1.5V) by the
desired resistor current. Different charge currents can be
programmed using a DAC, or using a PWM output from
a microcontroller or by switching in different program
resistors.
The LTC1734 is designed for a maximum current of
approximately 700mA. This translates to a maximum
PROG pin current of 700
A and a minimum program
resistor of approximately 2.1k. Because the PROG pin is in
a closed-loop signal path, the pole frequency must be kept
high enough to maintain adequate AC stability. See the
Stability section for more details.
Monitoring Charge Current
The voltage on the PROG pin indicates the charge current
as a proportion of the maximum current set by the
相关PDF资料 |
PDF描述 |
|---|---|
| LTC201CJ | QUAD 1-CHANNEL, SGL POLE SGL THROW SWITCH, CDIP16 |
| LTC201MJ/883B | QUAD 1-CHANNEL, SGL POLE SGL THROW SWITCH, CDIP16 |
| LTC201CN | QUAD 1-CHANNEL, SGL POLE SGL THROW SWITCH, PDIP16 |
| LTC3830DICE#PBF | SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, UUC |
| LTC3830DWF | SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, UUC |
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 |
发布紧急采购，3分钟左右您将得到回复。