TPS54040ADGQ

TPS54040A 器件是一款42V，0.5A，降压稳压器，具有一个集成的高侧MOSFET。电流模式控制提供了简单的外部补偿和组件选择的灵活性。一个低纹波脉冲跳跃模式将无负载、经调节的输入电源电流减少至116μA。通过使用使能引脚，当它为低电平时，关断电源电流降标称值为 1.3μA。 欠压闭锁在内部设定为 2.5V，但可采用使能引脚将之提高。输出电压启动斜坡受控于缓慢起动引脚，该引脚还可被配置用来控制电源排序或者跟踪。开漏电源状态良好信号表示输出处于其标称电压的 94% 至 107% 之内。 宽广的开关频率范围使得能够对效率及外部组件尺寸进行优化。频率折返和热关断功能在过载情况下对部件实施保护。

The TPS54040A device is a 42-V, 0.5-A, step-down (buck) regulator with an integrated high side n-channel MOSFET. To improve performance during line and load transients the device implements a constant frequency, current mode control which reduces output capacitance and simplifies external frequency compensation design. The wide switching frequency of 100 kHz to 2500 kHz allows for efficiency and size optimization when selecting the output filter components. The switching frequency is adjusted using a resistor to ground on the RT/CLK pin. The device has an internal phase lock loop (PLL) on the RT/CLK pin that is used to synchronize the power switch turn on to a falling edge of an external system clock. The TPS54040A has a default start up voltage of approximately 2.5V. The EN pin has an internal pull-up current source that can be used to adjust the input voltage under voltage lockout (UVLO) threshold with two external resistors. In addition, the pull up current provides a default condition. When the EN pin is floating the device will operate. The operating current is 116μA when not switching and under no load. When the device is disabled, the supply current is 1.3μA. The integrated 200mΩ high side MOSFET allows for high efficiency power supply designs capable of delivering 0.5 amperes of continuous current to a load. The TPS54040A reduces the external component count by integrating the boot recharge diode. The bias voltage for the integrated high side MOSFET is supplied by a capacitor on the BOOT to PH pin. The boot capacitor voltage is monitored by an UVLO circuit and will turn the high side MOSFET off when the boot voltage falls below a preset threshold. The TPS54040A can operate at high duty cycles because of the boot UVLO. The output voltage can be stepped down to as low as the 0.8 V reference. The TPS54040A has a power good comparator (PWRGD) which asserts when the regulated output voltage is less than 92% or greater than 109% of the nominal output voltage. The PWRGD pin is an open drain output which deasserts when the VSENSE pin voltage is between 94% and 107% of the nominal output voltage allowing the pin to transition high when a pull-up resistor is used. The TPS54040A minimizes excessive output overvoltage (OV) transients by taking advantage of the OV power good comparator. When the OV comparator is activated, the high side MOSFET is turned off and masked from turning on until the output voltage is lower than 107%. The SS/TR (slow start/tracking) pin is used to minimize inrush currents or provide power supply sequencing during power up. A small value capacitor should be coupled to the pin to adjust the slow start time. A resistor divider can be coupled to the pin for critical power supply sequencing requirements. The SS/TR pin is discharged before the output powers up. This discharging ensures a repeatable restart after an over-temperatu

• 3.5V 至 42V 输入电压范围
• 200mΩ 高侧金属氧化物半导体场效应晶体(MOSFET)
• 在带有脉冲跳跃的轻负载条件上实现了高效率Eco-mode™
• 比TPS54040更严密的使能阀值
• 为了实现更加精准的欠压锁定(UVLO) 电压可调的UVLO 电压和滞后
• 116μA 工作静态电流
• 1.3μA 关断电流
• 100kHz 至 2.5MHz 的开关频率同步至外部时钟
• 可调节的缓慢起动/排序
• 欠压(UV) 和过流(OV) 电源良好输出
• 0.8V 内部电压基准
• 采用微型小外形尺寸(MSOP)-10 和超薄型小外形尺寸(VSON)-10 封装
• 受WEBENCH 和SwitcherPro软件工具支持

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