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参数资料
| 型号： | LP3946ILD |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 文件页数： | 1/15页 |
| 文件大小： | 337K |
| 代理商： | LP3946ILD |
LP3945/LP3946
Battery Charge Management System
General Description
The LP3945 and LP3946 are complete charge management
systems that safely charge and maintain a Li-Ion battery or a
four-cell Ni-MH (LP3945 only) battery pack. The LP3945
offers the flexibility of programming charge current, battery
regulation voltage (4.1V/4.2V), battery type (Li-Ion/Ni-MH),
and End Of Charge (EOC) termination through the use of I
2C
interface. On the LP3946, these parameters are pro-
grammed at the factory per customer specification.
The pass transistor, charge current sensing resistor and
charge current setting resistors are all integrated inside the
LP3945 and LP3946. This eliminates the use of external
components and significantly reduces design time and board
space.
The LP3945 and LP3946 operate in four modes: pre-
qualification, constant current, constant voltage and mainte-
nance modes. The LP3945 features Ni-MH charging mode
as well. The charger has under-voltage and over-voltage
protection as well as an internal 5.6 hr timer to prevent
overcharging the battery. There are two open drain outputs
for status indication. An internal amplifier readily converts the
charge current into a voltage. Also, the charger can operate
in an LDO mode providing up to 1 Amp to the load.
Features
n
Integrated pass transistor
n
Does not require external charge current setting or
sensing resistors
n
I
2C interface (LP3945 only) — programmable charge
current, EOC current and battery regulation voltage
n
Near-depleted battery preconditioning
n
Built-in 5.6 hour timer
n
Under voltage and over voltage lockout on adaptor
n
Charge status indicators
n
Charge current monitor analog output
n
LDO mode operation can source 1 amp
n
Continuous over current/temperature protection
Key Specifications
n
1% charger voltage accuracy over 0C
≤ T
J
≤ 85C
n
4.5V to 6.0V input voltage range
n
LLP package power dissipation: 2.7W at T
A = 25C
Applications
n
Cellular phones
n
PDAs
n
Digital cameras
n
USB powered devices
n
Programmable current sources
Typical Application Circuit
20066502
20066501
October 2003
LP3945/LP3946
Battery
Charge
Management
System
2003 National Semiconductor Corporation
DS200665
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LP3946ILDX | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Battery Charge Management System |
| LP3946LD | 制造商:Rochester Electronics LLC 功能描述:STANDALONE CC/CV LIION BATTERY - Bulk |
| LP3946LD/NOPB | 功能描述:IC MANAGEMENT BATT CHARGE 14-LLP 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 |
| LP3947 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC |
| LP3947ISD-09 | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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