- 您现在的位置：买卖IC网 > PDF目录68613 > TPS60252RTETG4 (TEXAS INSTRUMENTS INC) 0.65 A SWITCHED CAPACITOR CONVERTER, 750 kHz SWITCHING FREQ-MAX, PQCC16 PDF资料下载
参数资料
| 型号： | TPS60252RTETG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.65 A SWITCHED CAPACITOR CONVERTER, 750 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, QFN-16 |
| 文件页数： | 25/25页 |
| 文件大小： | 762K |
| 代理商： | TPS60252RTETG4 |
APPLICATION INFORMATION
APPLICATION OVERVIEW
OPERATING PRINCIPLE
www.ti.com............................................................................................................................................................ SLVS769C – APRIL 2007 – REVISED APRIL 2008
Most of the current handsets fall into one of three categories. First is the clamshell design, with a main display on
the inside, a secondary display on the outside and a keypad backlight. Second is the bar design, with a main
display and a keypad backlight. Third is the slide type (slide-up and slide-down) design, with a main display and
two keypad banks (inside and outside). The TPS60250/2 are well suited for use in these three major phone
designs because the devices have 7 individually regulated white LED current paths that drive up to five white
LEDs in the main display and up to two white LEDs in sub display with regulated constant current for uniform
intensity. The main and sub display LED channels drive up to 25 mA and the auxiliary LED output (DM5) that
drives up to 80 mA can be assigned to keypad backlight, torch light, or low cost/weak camera flash application
using the I2C interface.
The TPS60250/2 circuits use only 4 external components: the input/output capacitors and 2 charge pump flying
capacitors. The few external components combined with the small 3mm
× 3mm QFN package provide for a small
total solution size. By combining independent control of three separate banks of backlight LEDs with low cost and
weak flash capability, the TPS60250/2 help designers minimize power consumption especially in the case of a
light load condition while reducing component count and package size.
Charge pumps are becoming increasingly attractive in battery-operated applications where board space and
maximum height of the converter are critical constraints. The major advantage of a charge pump is the use of
only capacitors as storage elements. The TPS60250/2 charge pumps provide regulated LED current from a 3 V
to 6 V input source. The devices operate in two modes. The 1
× mode, where the input is connected to the output
through a pass element, and a high efficiency 1.5
× charge pump mode. The IC maximizes power efficiency by
operating in 1
× and 1.5× modes as input voltage and LED current conditions require. The mode of operation is
automatically selected by comparing the forward voltage of the WLED plus the voltage of current sink for each
LED with the input voltage. The IC starts up in 1
× mode, and automatically transitions to 1.5× if the voltage at
any current sink input (DM_or DS_) falls below the 100 mV transition voltage. The IC returns to 1
× mode as the
input rises. Figure 13 provides a visual explanation of the 1
× to 1.5× transition.
In 1.5
× mode, the internal oscillator determines the charge/discharge cycles for the flying capacitors. During a
charge cycle, the flying capacitors are connected in series and charged up to the input voltage. After the on-time
of the internal oscillator expires, the flying capacitors are reconfigured to be in parallel and then connected in
series to the input voltage. This provides an output of 1.5
× the input voltage. After the off-time of the internal
oscillator expires, another charge cycle initiates and the process repeats.
Copyright 2007–2008, Texas Instruments Incorporated
9
相关PDF资料 |
PDF描述 |
|---|---|
| TPS60252RTET | 0.65 A SWITCHED CAPACITOR CONVERTER, 750 kHz SWITCHING FREQ-MAX, PQCC16 |
| TPS61097-33DBVT | 0.475 A BATTERY CHARGE CONTROLLER, PDSO5 |
| TPS61097-18DBVR | 0.475 A BATTERY CHARGE CONTROLLER, PDSO5 |
| TPS61097-01DBVT | 0.475 A BATTERY CHARGE CONTROLLER, PDSO6 |
| TPS61097-50DBVR | 0.475 A BATTERY CHARGE CONTROLLER, PDSO5 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS60255 | 制造商:TI 制造商全称:Texas Instruments 功能描述:HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs DRIVER WITH 1 WIRE INTERFACE |
| TPS60255EVM-262 | 功能描述:电源管理IC开发工具 TPS60255EVM-262 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 |
| TPS60255RTER | 功能描述:LED照明驱动器 7Ch High Eff 175 mA Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| TPS60255RTERG4 | 功能描述:LED照明驱动器 7Ch Hi Eff 175mA Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| TPS60255RTET | 功能描述:LED照明驱动器 7Ch Hi Eff 175mA Charge Pump RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
发布紧急采购，3分钟左右您将得到回复。