TPS54332 器件是一款 28V、3.5A 非同步降压转换器,该器件集成了一个低 RDS(on) 的高侧 MOSFET。为了提高轻负载条件下的效率,将自动激活脉冲跳跃 Eco-mode 特性。此外,1μA 的关断电源电流使得该器件适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元件数量。一个电阻分压器对输入欠压锁定的迟滞进行编程。过压瞬态保护电路可限制启动期间和瞬态条件下的电压过冲。逐周期电流限制方案、频率折返和热关断特性可在过载条件下对器件和负载施加保护。TPS54332 采用 8 引脚 SOIC PowerPAD 集成电路封装。
Changes from Revision C (November 2014) to Revision D (September 2023)
Changes from Revision B (February 2012) to Revision C (November 2014)
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
BOOT | 1 | O | A 0.1-μF bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor falls below the minimum requirement, the high-side MOSFET is forced to switch off until the capacitor is refreshed. |
VIN | 2 | I | Input supply voltage, 3.5 V to 28 V. |
EN | 3 | I | Enable pin. Pull below 1.25 V to disable. Float to enable. TI recommends programming the input undervoltage lockout with two resistors. |
SS | 4 | I | Slow-start pin. An external capacitor connected to this pin sets the output rise time. |
VSENSE | 5 | I | Inverting node of the gm error amplifier. |
COMP | 6 | O | Error amplifier output, and input to the PWM comparator. Connect frequency compensation components to this pin. |
GND | 7 | — | Ground |
PH | 8 | O | The source of the internal high-side power MOSFET |
PowerPAD | 9 | — | GND pin must be connected to the exposed pad for proper operation. |