UCC3954D

更新时间： 2024-11-10 04:27:03

品牌	Logo	应用领域
德州仪器 - TI		转换器稳压器开关式稳压器或控制器电源电路电池开关式控制器光电二极管信息通信管理
页数	文件大小	规格书
10页	332K
描述
Single Cell Lithium-Ion to +3.3V Converter

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中文翻译

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技术参数
数据手册

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UCC3954D 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Obsolete	零件包装代码：	SOIC
包装说明：	SOP, SOP8,.25	针数：	8
Reach Compliance Code：	not_compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.92
Is Samacsys：	N	模拟集成电路 - 其他类型：	BATTERY CHARGE CONTROLLER
控制模式：	VOLTAGE-MODE	控制技术：	PULSE WIDTH MODULATION
最大输入电压：	4.2 V	最小输入电压：	2.5 V
标称输入电压：	3.5 V	JESD-30 代码：	R-PDSO-G8
长度：	4.89 mm	功能数量：	1
端子数量：	8	最高工作温度：	70 °C
最低工作温度：		最大输出电流：	0.2 A
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP8,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
认证状态：	Not Qualified	座面最大高度：	1.75 mm
子类别：	Switching Regulator or Controllers	表面贴装：	YES
切换器配置：	BUCK-BOOST	最大切换频率：	200 kHz
技术：	BICMOS	温度等级：	COMMERCIAL
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3.9 mm	Base Number Matches：	1

UCC3954D 数据手册

UCC3954

PRELIMINARY INFORMATION

Single Cell Lithium-Ion to +3.3V Converter

FEATURES

DESCRIPTION

• Converts Lithium-Ion Cell to The UCC3954, along with a few external components, develops a regulated +3.3V

+3.3V at 700mA Load

Current

from a single lithium-ion battery whose terminal voltage can vary between 2.5V and

4.2V. The UCC3954 employs a simple flyback (Buck-Boost) technique to convert the

battery energy to +3.3V. This is accomplished by referencing the lithium-ion cell’s

positive terminal to system ground. The negative terminal of the battery is the return

point for the UCC3954. This approach enables the converter to maintain constant fre-

quency operation whether the cell voltage is above or below the output voltage. An

additional benefit of this technique is its inherent ability to disconnect the battery from

the load in shutdown mode.

• Load Disconnect in

Shutdown

• High Efficiency Flyback

Operation

• Internal 0.15Ω Switch

• Low Battery LED Driver

• Internal 2A Current Limit

• Internal 200kHz Oscillator

The UCC3954 operates as a fixed 200kHz switching frequency voltage mode flyback

converter. The oscillator time base and ramp are internally generated by the

UCC3954 and require no external components. A 2A current limit for the internal

0.15Ω power switch provides protection in the case of an output short circuit. When

left open, an internal 100kΩ resistor pulls the SD pin to BAT–, which puts the

UCC3954 in shutdown mode, and thereby reduces power consumption to sub-µA lev-

els. A low battery detect function will drive the LOWBAT pin low (minimum of 5mA

sink current) when the battery has been discharged to within 200mV of the prede-

fined lockout voltage. The LOWBAT pin is intended for use with an external LED to

provide visual warning that the battery is nearly exhausted. The lockout mode is acti-

vated when the battery is discharged to 2.55V. In lockout mode, the part consumes

15µA. Once the UCC3954 has entered lockout mode, the user must insert a fresh

battery whose open circuit voltage is greater than 3.1V. This prevents a system-level

oscillation of the lockout function due to the lithium-ion battery’s large equivalent se-

ries resistance.

• 8 Pin D, N, 14 Pin PW

Packages

Additional features of the UCC3954 include a trimmed –1.1V reference and internal

feedback scaling resistors, a precision error amplifier, low quiescent current drain in

shutdown mode, and a softstart function. The UCC3954 is offered in the 8 pin D,

14 pin PW (surface mount), and N (through hole) packages.

BLOCK DIAGRAM

UDG-96137-1

6/98

12 3 4 5 6 7...10

中文翻译

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与UCC3954D相关器件

型号	品牌	获取价格	描述	数据表
UCC3954DTR	TI	获取价格	Single Cell Lithium-Ion to +3.3V Converter
UCC3954N	TI	获取价格	Single Cell Lithium-Ion to +3.3V Converter
UCC3954PW	ETC	获取价格	Voltage-Mode SMPS Controller
UCC3956	TI	获取价格	Switch Mode Lithium-Ion Battery Charger Controller
UCC3956DW	TI	获取价格	SWITCH-MODE LITHIUM-ION BATTERY CHARGE CONTROLLER
UCC3956DWTR	ETC	获取价格	Battery Management
UCC3956DWTRG4	TI	获取价格	0.6A BATTERY CHARGE CONTROLLER, 110kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, SOIC-20
UCC3956N	ETC	获取价格	Battery Management
UCC3956NG4	TI	获取价格	Switch-mode Lead-Acid Battery Charger with Differential Current Sense 20-PDIP -20 to 70
UCC3957	TI	获取价格	Three - Four Cell Lithium-Ion Protector Circuit

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