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| 型号： | TPS61251DSG |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 3500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 2 X 2 MM, PLASTIC, WSON-8 |
| 文件页数： | 1/21页 |
| 文件大小： | 446K |
| 代理商： | TPS61251DSG |
R4
1 M
C1
10 F
C
4.7 F
OUT
L
VIN
EN
ILIM
GND
VOUT
FB
PG
R
20 k
ILIM
C
1 nF
FF
V
IN
R2
280 k
L1
1 H
R1
1 M
C
>150 F
BULK
V
OUT
TPS61251
Power Good
Output
2.3 V to
6.0 V
5.5 V
www.ti.com
SLVSAF7 – SEPTEMBER 2010
BOOST CONVERTER FOR BATTERY BACKUP CHARGING WITH ADJUSTABLE
CONSTANT CURRENT AND SNOOZE MODE
Check for Samples: TPS61251
1
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
–
Programmable from 100mA up to 1500mA
Available in a 2×2-mm QFN-8 Package
Snooze Mode Draws Only 2 mA (typ.)
APPLICATIONS
Quiescent Current
Current Limited Applications With High Peak
Designed to Charge Large Capacitor Values in
Power Loads (SSD, PCMCIA Tx Bursts,
the Farad Range
Memory, GPRS/GSM Tx)
Up to 92% Efficiency
Li-Ion Applications
Power Good Indicates Appropriate Output
Battery Backup Applications
Voltage Level even in Shut Down
Audio Applications
VIN Range from 2.3V to 6.0V
RF-PA Buffer
Adjustable Output Voltage up to 6.5V
100% Duty-Cycle Mode When VIN > VOUT
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 VOUT has reached its programmed value. The charge
current can be programmed by an external resistor RILIM and 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).
1
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.
Copyright 2010, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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相关代理商/技术参数 |
参数描述 |
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| TPS61251DSGR | 功能描述:直流/直流开关调节器 3.5MHz1.5A Current Limit92% Eff Boost RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS61251DSGT | 功能描述:直流/直流开关调节器 3.5MHz1.5A Current Limit92% Eff Boost RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS61251DSGT | 制造商:Texas Instruments 功能描述:IC BOOST DC/DC CONV ADJ 3V-6.5V OUTPUT 制造商:Texas Instruments 功能描述:IC, BOOST DC/DC CONV, ADJ 3V-6.5V OUTPUT, 1.5A, 8-QFN |
| TPS61251EVM-517 | 功能描述:电源管理IC开发工具 TPS61251 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS61252 | 制造商:TAOS 制造商全称:TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS 功能描述:TINY 1.5-A BOOST CONVERTER WITH ADJUSTABLE INPUT CURRENT LIMIT |
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