TPS61251

更新时间： 2024-11-15 08:38:51

品牌	Logo	应用领域
德州仪器 - TI		转换器电池升压转换器
页数	文件大小	规格书
21页	425K
描述
BOOST CONVERTER FOR BATTERY BACKUP CHARGING WITH ADJUSTABLE CONSTANT CURRENT AND SNOOZE MODE

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TPS61251 数据手册

TPS61251

www.ti.com

SLVSAF7 –SEPTEMBER 2010

BOOST CONVERTER FOR BATTERY BACKUP CHARGING WITH ADJUSTABLE

CONSTANT CURRENT AND SNOOZE MODE

Check for Samples: TPS61251

FEATURES

•

Load Disconnect and Reverse Current

Protection

•

Resistor Programmable Input Current Limit

•

Short Circuit Protection

–

±10% Current Accuracy at 500mA over Full

Temperature Range

Typical Operating Frequency 3.5 MHz

Available in a 2×2-mm QFN-8 Package

Programmable from 100mA up to 1500mA

•

Snooze Mode Draws Only 2 mA (typ.)

Quiescent Current

APPLICATIONS

•

Current Limited Applications With High Peak

Power Loads (SSD, PCMCIA Tx Bursts,

Memory, GPRS/GSM Tx)

Designed to Charge Large Capacitor Values in

the Farad Range

•

Up to 92% Efficiency

•

Li-Ion Applications

Battery Backup Applications

Audio Applications

RF-PA Buffer

Power Good Indicates Appropriate Output

Voltage Level even in Shut Down

•

V_INRange from 2.3V to 6.0V

Adjustable Output Voltage up to 6.5V

100% Duty-Cycle Mode When V_IN> V_OUT

DESCRIPTION

The TPS61251 device provides a power supply solution for products powered by either a three-cell, NiCd or

NiMH battery, or a one-cell Li-Ion or Li-polymer battery. The wide input voltage range is ideal to power portable

applications like mobile phones, solid state drives (SSD) and wireless modems. The converter is designed to

charge large capacitors in the Farad range to support battery back up applications. During capacitor charging the

TPS61251 is working as a constant current source until V_OUThas reached its programmed value. The charge

current can be programmed by an external resistor R_ILIMand provides a ±10% accuracy for the average input

current limit.

The TPS61251 in combination with a reservoir capacitor allows the converter to provide high current pules that

would exceed the capability of the suppling circuit (PC slot, USB) and keeps the slot power safely within its

capabilities. During light loads the device will automatically enters an enhanced power save mode (Snooze

Mode), which allows the converter to maintain the required output voltage, while only drawing 2 mA from the

battery. This will allow maximum efficiency at lowest quiescent currents.

TPS61251 allows the use of small inductors and input capacitors to achieve a small solution size. During

shutdown, the load is completely disconnected from the battery and will not discharge either the battery nor the

charged bulk capacitor. The TPS61251 is available in a 8-pin QFN package measuring 2×2 mm (DSG).

V_OUT

VOUT

1 μH

5.5 V

V_IN

1 MΩ

C_FF

1 nF

VIN

C_OUT

4.7 µF

C_BULK

>150 µF

2.3 V to

6.0 V

10 µF

1 MΩ

280 kΩ

ILIM

R_ILIM

20 kΩ

Power Good

Output

GND

TPS61251

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...21

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与TPS61251相关器件

型号	品牌	获取价格	描述	数据表
TPS61251DSGR	TI	获取价格	BOOST CONVERTER FOR BATTERY BACKUP CHARGING WITH ADJUSTABLE CONSTANT CURRENT AND SNOOZE MO
TPS61251DSGT	TI	获取价格	BOOST CONVERTER FOR BATTERY BACKUP CHARGING WITH ADJUSTABLE CONSTANT CURRENT AND SNOOZE MO
TPS61252	TAOS	获取价格	TINY 1.5-A BOOST CONVERTER WITH ADJUSTABLE INPUT CURRENT LIMIT
TPS61252	TI	获取价格	电流精度为 ±20%、具备可调节输入电流限制的 3.5MHz、1.5A、效率为 92% 的
TPS61252DSGR	TI	获取价格	电流精度为 ±20%、具备可调节输入电流限制的 3.5MHz、1.5A、效率为 92% 的
TPS61252DSGT	TI	获取价格	电流精度为 ±20%、具备可调节输入电流限制的 3.5MHz、1.5A、效率为 92% 的
TPS61253	TI	获取价格	3.5-MHz HIGH EFFICIENCY STEP-UP CONVERTER IN CHIP SCALE PACKAGING
TPS612531A	TI	获取价格	TPS61253A 3.8-MHz, 5-V / 4-A Boost Converter in 1.2-mm x 1.3-mm WCSP
TPS612532A	TI	获取价格	TPS61253A 3.8-MHz, 5-V / 4-A Boost Converter in 1.2-mm x 1.3-mm WCSP
TPS612532AYFFR	TI	获取价格	TPS61253A 3.8-MHz, 5-V / 4-A Boost Converter in 1.2-mm x 1.3-mm WCSP

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