The TPS51221 is a dual synchronous buck regulator controller with 2 LDOs. It is optimized for 5-V/3.3-V system controller, enabling designers to cost effectively complete 2-cell to 4-cell notebook system power supply. The TPS51221 supports high efficiency, fast transient response and 99% duty cycle operation. It supports supply input voltage ranging from 4.5 V to 28 V, and output voltages from 1 V to 12 V. Peak current mode supports stability operation with lower ESR capacitor and output accuracy. The high duty (99%) operation and wide input/ output voltage range supports flexible design for small mobile PCs and a wide variety of other applications. The fixed frequency can be adjusted from 200 kHz to 1MHz by a resistor, and each channel runs 180° out of phase.
| TPS51020 | TPS5120 | TPS51221 | TPS51222 | TPS5124 | |
| Topology | Buck | Buck | Buck | Buck | Buck |
| Vin(Min)(V) | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 |
| Vin(Max)(V) | 28 | 28 | 28 | 32 | 15 |
| Vout(Min)(V) | 0.9 | 0.9 | 1 | 1 | 0.9 |
| Vout(Max)(V) | 24 | 26 | 12 | 12 | 12 |
| Regulated Outputs(#) | 2 | 2 | 2 | 2 | 2 |
| Iout(Max)(A) | 20 | 20 | 20 | 20 | 20 |
| Switching Frequency(Max)(kHz) | 450 | 500 | 1000 | 1000 | 500 |
| Iq(Typ)(mA) | 1.4 | 1.1 | 1.3 | 1.1 | |
| Pin/Package | 30TSSOP | 30TSSOP | 32QFN | 32QFN | 30TSSOP |
| Thermal Shutdown | Yes | Yes | Yes | Yes | No |
| Vout2(Min)(V) | 0.9 | 0.9 | 1 | 1 | 0.9 |
| Vout2(Max)(V) | 24 | 26 | 12 | 12 | 12 |
| Iout2(A) | 20 | 15 | 20 | 20 | 20 |
| Rating | Catalog | Catalog | Catalog | Catalog | Catalog |
| Duty Cycle(Max)(%) | 88 | 80 | 99 | 99 | 80 |
| 器件 | 状态 | 温度 (oC) | 价格（美元） | 封装 | 引脚 | 封装数量 | 封装载体 | 丝印标记 |
| TPS51221RTVR | ACTIVE | -40 to 85 | 2.25 | 1ku | QFN (RTV) | 32 | 3000 | LARGE T&R | TPS 51221 |
| TPS51221RTVRG4 | ACTIVE | -40 to 85 | 2.25 | 1ku | QFN (RTV) | 32 | 3000 | LARGE T&R | TPS 51221 |
| TPS51221RTVT | ACTIVE | -40 to 85 | 2.50 | 1ku | QFN (RTV) | 32 | 250 | SMALL T&R | TPS 51221 |
| TPS51221RTVTG4 | ACTIVE | -40 to 85 | 2.50 | 1ku | QFN (RTV) | 32 | 250 | SMALL T&R | TPS 51221 |
| 器件 | 环保计划* | 铅/焊球涂层 | MSL 等级/回流焊峰 | 环保信息与无铅 (Pb-free) | DPPM / MTBF / FIT 率 |
| TPS51221RTVR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | TPS51221RTVR | |
| TPS51221RTVRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | TPS51221RTVRG4 | TPS51221RTVRG4 |
| TPS51221RTVT | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | TPS51221RTVT | |
| TPS51221RTVTG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | TPS51221RTVTG4 | TPS51221RTVTG4 |
| 名称 | 型号 | 公司 | 工具/软件类型 |
| TPS51221EVM 评估模块 | TPS51221EVM-001 | Texas Instruments | 开发电路板/EVM |
| TPS51100EVM-001 评估模块 | TPS51100EVM-001 | Texas Instruments | 开发电路板/EVM |
| TPS51116EVM-001 评估模块 | TPS51116EVM-001 | Texas Instruments | 开发电路板/EVM |
| SwitcherPro(TM) 开关电源设计工具 | SWITCHERPRO | Texas Instruments | 应用软件 |
| 说明 | 型号 | 公司 |
| 二相同步 降压，输入电压为 5V 或 12V。 多路输出电压：1.8V 和 3.3V | PMP176 | Texas Instruments |
| 同步降压时，输入电压为 19.5V | PMP070 | Texas Instruments |
| 同步降压，输入电压为 12V | PMP217 | Texas Instruments |
| 热插拔、推挽、同步 降压、负反向、双路同步 降压参考设计 | PMP156 | Texas Instruments |
| 集成 FET、正向、双路同步的同步降压 降压参考设计 | PMP041 | Texas Instruments |