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| 型号： | TPS62242DRV |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | 2.25 MHz 300 mA Step Down Converter in 2x2SON/TSOT23 Package |
| 中文描述： | 2.25兆赫300毫安降压转换器2x2SON/TSOT23包 |
| 文件页数： | 6/29页 |
| 文件大小： | 859K |
| 代理商： | TPS62242DRV |
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Outputvoltage
VOUT nominal
PWM + PFM
Lightload
PFMMode
moderatetoheavyload
PWMMode
100% Duty Cycle Low Dropout Operation
UNDERVOLTAGE LOCKOUT
MODE SELECTION
ENABLE
TPS62240, TPS62242, TPS62243
SLVS762B – JUNE 2007 – REVISED SEPTEMBER 2007
Figure 26. Power Save Mode
The device starts to enter 100% duty cycle mode once the input voltage comes close to 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 = VOmax + IOmax × (RDSo(n)max + RL)
With:
IOmax = maximum output current plus inductor ripple current
RDS(on)max = maximum P-channel switch RDS(on).
RL = DC resistance of the inductor
VOmax = 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 under-voltage lockout
threshold is typically 1.85V with falling VIN.
The MODE pin allows mode selection between forced PWM mode and Power Save Mode.
Connecting this pin to GND enables the Power Save Mode with automatic transition between PWM and PFM
mode. Pulling the MODE pin high forces the converter to operate in fixed frequency PWM mode even at light
load currents. This allows simple filtering of the switching frequency for noise sensitive applications. In this mode,
the efficiency is lower compared to the Power Save Mode during light loads.
The condition of the MODE pin can be changed during operation and allows efficient power management by
adjusting the operation mode of the converter to the specific system requirements.
The device is enabled setting EN pin to high. During the start up time tStart Up the internal circuits are settled and
the soft start circuit is activated. The EN input can be used to control power sequencing in a system with various
dc/dc converters. The EN pin can be connected to the output of another converter, to drive the EN pin high and
getting a sequencing of supply rails. With EN pin = GND, the device enters shutdown mode in which all circuits
are disabled. In fixed output voltage versions, the internal resistor divider network is then disconnected from FB
pin.
14
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Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS62240 TPS62242 TPS62243
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS62242DRVR | 功能描述:直流/直流开关调节器 2.25MHz 300mA 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 |
| TPS62242DRVRG4 | 功能描述:直流/直流开关调节器 2.25MHz 300mA 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 |
| TPS62242DRVT | 功能描述:直流/直流开关调节器 2.25MHz 300mA 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 |
| TPS62242DRVTG4 | 功能描述:直流/直流开关调节器 2.25MHz 300mA 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 |
| TPS62242QDDCRQ1 | 功能描述:开关变换器、稳压器与控制器 AC 2.25MHz 300mA SD Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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