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| 型号： | TPS62273DRVR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.84 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 2 X 2 MM, 0.80 MM HEIGHT, GREEN, PLASTIC, SON-6 |
| 文件页数： | 5/24页 |
| 文件大小： | 882K |
| 代理商： | TPS62273DRVR |
Outputvoltage
Vout(PWM)
Vout+1%
PFMComparator
threshold
VoltagePositioning
Lightload
PFMMode
moderatetoheavyload
PWMMode
100% Duty Cycle Low Dropout Operation
Undervoltage Lockout
Output Voltage Selection VSEL
www.ti.com ........................................................................................................................................... SLVS799C – NOVEMBER 2007 – REVISED JANUARY 2009
Figure 24. Power Save Mode
The device starts to enter 100% duty cycle Mode once the input voltage comes close the nominal output voltage.
In order to maintain the output voltage, the High Side MOSFET switch is turned on 100% for one or more cycles.
With further decreasing VIN the High Side MOSFET switch is turned on completely. In this case the converter
offers a low input-to-output voltage difference. This is particularly useful in battery-powered applications to
achieve longest operation time by taking full advantage of the whole battery voltage range.
The minimum input voltage to maintain regulation depends on the load current and output voltage, and can be
calculated as:
Vinmin = Voutmax + loutmax × (RDS(on)max + RL)
With
Ioutmax = maximum output current plus inductor ripple current
RDS(on)max = maximum P-channel switch RDS(on).
RL = DC resistance of the inductor
Voutmax = nominal output voltage plus maximum output voltage tolerance
The undervoltage lockout circuit prevents the device from malfunctioning at low input voltages and from
excessive discharge of the battery and disables the output stage of the converter. The undervoltage lockout
threshold is typically 1.85V with falling VIN.
The VSEL pin features output voltage selection. The output voltages are set with an internal high precision
feedback divider network. No further external components for output voltage setting or compensation are
required. This features smallest solution size.
Connecting the VSEL pin to an external logic control signal allows simple dynamic voltage scaling for low power
processors cores. During operation of the device, the output voltage can be changed with VSEL pin.
This allows setting the core voltage of an processor according to its operating mode and helps to optimize power
consumption. Table 1 shows an overview of the selectable output voltages.
Copyright 2007–2009, Texas Instruments Incorporated
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| TPS62273DRVRG4 | 功能描述:直流/直流开关调节器 2.25MHz 400mA Step- Down Cnvrtr 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 |
| TPS62273DRVT | 功能描述:直流/直流开关调节器 2.25MHz 400mA Step- Down Converter 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 |
| TPS62273DRVTG4 | 功能描述:直流/直流开关调节器 2.25MHz 400mA Step- Down Cnvrtr 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 |
| TPS62290DRVR | 功能描述:直流/直流开关调节器 2.25MHz 1A Step- Down Converter 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 |
| TPS62290DRVRG4 | 功能描述:直流/直流开关调节器 2.25MHz 1A Step- Down Converter 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 |
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