达拉斯（2008年3月18日）消息，德州仪器有限公司（NYSE: TXN）推出一款空间节省型400-mA降压型转换器，应用便携式设计。95%的有效转换，可使其应用在移动手机、便携式航海系统、低功率DSP和微控制器应用。参见： www.ti.com/tps62270-pr 。
TI的TPS62270 DC/DC同步转换器，能有效地调节输出电压，使电压在+/-1.5精度情况下低于0.9V，使设备能够为TI最新的C5000DSP供以动力，低功率MSP430微控制器和具有超精度控制器核的控制器提供必要条件。开关的电压选择插头可使设计者在两个固定的电压级之间，通过控制动态电压比例固定和缩减功率损耗。
TPS62270能提供高达400mA的输出电流，可以用一块小锂离子电池给以供电，输入电压为2.0 V到6V。在轻负荷操作情况下，转化器可自动进入功率节省模块，消耗电流仅为15-uA。针对低噪音应用，设备可被强制调成固定频率的脉冲宽度。在关闭模式下，TPS62270的电流损耗能被减少到1uA。
2.25-MHz DC/DC转换器适用于任何便携式设计
新转换器扩展了于2007年推出的TPS622x家族系列。TPS62240支持的输出电流可达300 mA、TPS62260 为600 mA、TPS62290为1 A.TI提供了全套评估模块和应用说明书。评估模块的Gerber文件还可从power.ti.com获得。
售货情况
TPS62270有六个针脚，为2 mm x 2 mm x 0.8 mm包装，可从TI和其授权分销商处订购。TPS62270的建议零售价为1.05美元（一次性购买>1000件）
original text
TI INTRODUCES TINY 400-MA LOW-POWER DC/DC CONVERTER FOR PORTABLE DESIGNS
DALLAS （March 18, 2008） - Texas Instruments Incorporated （TI） （NYSE: TXN） introduced today a space-saving, 400-mA step-down converter for portable designs. The 95-percent efficient converter extends battery life in mobile phones, portable navigation systems and low-power DSP and microcontroller applications. See: www.ti.com/tps62270-pr.
TI‘s TPS62270 synchronous DC/DC converter efficiently regulates output voltages down to 0.9 V with +/-1.5 percent accuracy, enabling the device to power TI‘s newest C5000 DSPs, low-power MSP430 microcontrollers and controllers with ultra-precise processor core supply requirements. The switcher‘s voltage select （Vsel） pin gives designers the ability to switch between two fixed voltage levels to customize and cut power consumption in the processor core through dynamic voltage scaling.
The TPS62270 provides up to 400 mA of output current, and can be powered by a single-cell lithium-ion battery with an input voltage range of 2.0 V to 6 V. The converter automatically enters a power save mode during light load operating conditions, consuming only 15-uA of quiescent current. For low-noise applications, the device can be forced into fixed frequency pulse width modulation （PWM） mode by pulling the MODE pin high. In the shutdown mode, the TPS62270‘s current consumption is reduced to less than 1 uA.
2.25-MHz DC/DC converters for any portable design
The new converter expands TI‘s TPS622x family introduced in 2007. TPS62240 supports output currents up to 300 mA; the TPS62260 supports up to 600 mA; and the TPS62290 supports up to 1 A. TI offers a full range of evaluation modules and application notes. Gerber files of the evaluation modules are also available through power.ti.com.
Available today
The TPS62270 comes in a 6-pin, 2 mm x 2 mm x 0.8 mm SON package, and is shipping in volume from TI and its authorized distributors. Suggested retail pricing for the TPS62270 is $1.05 in 1,000-piece quantities.
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