TPS54233QDRQ1

TPS54233-Q1 是一款 28V，2A 非同步降压转换器，集成有一个低 RDS(on) 的高侧 MOSFET。为了提高轻负载条件下的效率，一个跨周调制 Eco-mode 特性被自动激活。此外，1μA 的关断电源电流使得此器件可用于电池供电类应用。具有内部斜坡补偿的电流模式控制简化了外部补偿计算并在允许使用陶瓷输出电容器的同时减少了组件数量。一个电阻分压器可预先确定输入欠压闭锁的滞后时间。一个过压瞬态保护电流限制了启动和瞬态条件情况下的电压过冲。一旦发生过载情况，一个逐周期电流限制机制、频率折返和热关断可对器件进行保护。TPS54233-Q1 采用一个 8 引脚 SOIC 封装。为了改进其散热性能，已对此类封装进行了内部优化。

The TPS54233-Q1 is a 28 V, 2 A, step-down (buck) converter 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 TPS54233-Q1 has a pre-set switching frequency of 300kHz.

The TPS54233-Q1 needs a minimum input voltage of 3.5V to operate normally. The EN pin has an internal pullup current source that can be used to adjust the input voltage under-voltage lockout (UVLO) with two external resistors. In addition, the pull-up current provides a default condition when the EN pin is floating for the device to operate. The operating current is 75μA typically when not switching and under no load. When the device is disabled, the supply current is 1μA typically.

The integrated 80mΩ high-side MOSFET allows for high efficiency power supply designs with continuous output currents up to 2 A.

The TPS54233-Q1 reduces the external component count by integrating the boot recharge diode. The bias voltage for the integrated high-side MOSFET is supplied by an external 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 voltage falls below a preset threshold of 2.1V typically. The output voltage can be stepped down to as low as the reference voltage.

By adding an external capacitor, the slow start time of the TPS54233-Q1 can be adjustable which enable flexible output filter selection.

To improve the efficiency at light load conditions, the TPS54233-Q1 enters a special pulse skipping Eco-modeTM when the peak inductor current drops below 100 mA typically.

The frequency foldback reduces the switching frequency during startup and over current conditions to help control the inductor current. The thermal shut down gives the additional protection under fault conditions.

• 符合汽车应用要求
• 器件温度 1 级： - 40℃ 至 +125℃ 的环境运行温度范围
• 器件人体模型 (HBM) 静电放电 (ESD) 分类等级 H2
• 器件充电器件模型 (CDM) ESD 分类等级 C3B
• 3.5V 至 28V 输入电压范围
• 输出电压可调低至 0.8V
• 集成型 80mΩ 高侧金属氧化物半导体场效应晶体管 (MOSFET) 支持高达 2A 的持续输出电压
• 使用跨周模式可在轻负载时实现高效率 Eco-mode
• 300kHz 固定开关频率
• 典型值为 1μA 的关断静态电流
• 可调慢启动可限制涌入电流
• 可编程欠压闭锁 (UVLO) 阀值
• 过压瞬态保护
• 逐周期电流限制、频率折返和热关断保护
• 采用小外形集成电路 (SOIC)8 封装
• 由 SwitcherPro 软件工具提供支持

• LCD 显示
• 外设
• 电池充电器
• 车用音频电源
• 5V，12V 和 24V 分布式电源系统