UCC3954

更新时间： 2024-11-10 04:27:03

品牌	Logo	应用领域
德州仪器 - TI		转换器电池
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

获取价格

数据手册

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UCC3954 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UCC3954相关器件

型号	品牌	获取价格	描述	数据表
UCC3954D	TI	获取价格	Single Cell Lithium-Ion to +3.3V Converter
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

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