Datasheet > LP3945LDX

LP3945LDX

更新时间： 2024-11-15 19:38:35

品牌	Logo	应用领域
德州仪器 - TI		光电二极管
页数	文件大小	规格书
15页	337K
描述
IC,BATTERY MANAGEMENT,LLCC,14PIN,PLASTIC

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技术参数
数据手册

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LP3945LDX 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	SON, SOLCC14,.16,20	Reach Compliance Code：	unknown
风险等级：	5.92	JESD-30 代码：	R-PDSO-N14
JESD-609代码：	e0	端子数量：	14
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SON
封装等效代码：	SOLCC14,.16,20	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	电源：	5 V
认证状态：	Not Qualified	子类别：	Power Management Circuits
标称供电电压 (Vsup)：	5 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	NO LEAD	端子节距：	0.5 mm
端子位置：	DUAL	Base Number Matches：	1

LP3945LDX 数据手册

October 2003

LP3945/LP3946

Battery Charge Management System

General Description

Features

n Integrated pass transistor

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 I²C

interface. On the LP3946, these parameters are pro-

grammed at the factory per customer specification.

n Does not require external charge current setting or

sensing resistors

n I²C 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

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.

Key Specifications

n 1% charger voltage accuracy over 0˚C ≤ T_J≤ 85˚C

n 4.5V to 6.0V input voltage range

n LLP package power dissipation: 2.7W at T_A= 25˚C

Applications

n Cellular phones

n PDAs

n Digital cameras

n USB powered devices

n Programmable current sources

Typical Application Circuit

20066502

20066501

DS200665

www.national.com

12 3 4 5 6 7...15

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与LP3945LDX相关器件

型号	品牌	获取价格	描述	数据表
LP3946	NSC	获取价格	Battery Charge Management System
LP3946ILDX	NSC	获取价格	Battery Charge Management System
LP3946LD	NSC	获取价格	IC,BATTERY MANAGEMENT,LLCC,14PIN,PLASTIC
LP3946LDX	TI	获取价格	IC,BATTERY MANAGEMENT,LLCC,14PIN,PLASTIC
LP3947	NSC	获取价格	USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC
LP3947	TI	获取价格	USB/交流适配器，单节锂离子电池充电器 IC
LP3947ISD-09	TI	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14, WSON-14
LP3947ISD-09/NOPB	TI	获取价格	LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC
LP3947ISD-51	NSC	获取价格	IC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14, LLP-14, Power Management Circuit
LP3947ISD-51	TI	获取价格	LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC

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