数据：
LM3485 Hysteretic PFET Buck Controller 数据表 
LM3485是一款高效PFET开关稳压控制器，可用于快速，轻松地开发小型，低成本的开关降压稳压器广泛的应用。迟滞控制架构提供简单的设计，无需使用各种外部组件的任何控制环稳定性问题。 PFET架构还允许低元件数量以及超低压差，100％占空比工作。另一个好处是在轻负载条件下高效运行而不会增加输出纹波。
通过测量PFET的R DS（ON）上的电压来提供电流限制保护，从而消除了对检测电阻的需求。可通过单个电阻调节逐周期电流限制，确保在一系列输出电流范围内安全运行。
| Vin (Min) (V) |
| Vin (Max) (V) |
| Vout (Min) (V) |
| Vout (Max) (V) |
| Iout (Max) (A) |
| Regulated Outputs (#) |
| Number of Phases |
| Switching Frequency (Min) (kHz) |
| Switching Frequency (Max) (kHz) |
| Iq (Typ) (mA) |
| Features |
| Duty Cycle (Max) (%) |
| Operating Temperature Range (C) |
| Rating |
| Package Group |
| Control Mode |
| LM3485-Q1 | LM1770 | LM1771 | LM25085 | LM25085-Q1 | LM3475 | LM3477 | LM3485 | LM3489 | LM3489-Q1 |
|---|---|---|---|---|---|---|---|---|---|
| 4.5 | 2.8 | 2.8 | 4.5 | 4.5 | 2.7 | 2.95 | 4.5 | 4.5 | 4.5 |
| 35 | 5.5 | 5.5 | 42 | 42 | 10 | 35 | 35 | 35 | 35 |
| 1.242 | 0.8 | 0.8 | 1.25 | 1.25 | 0.8 | 1.265 | 1.242 | 1.239 | 1.239 |
| 35 | 4.5 | 4.5 | 42 | 42 | 10 | 31 | 35 | 35 | 35 |
| 4 | 4 | 6 | 10 | 10 | 5 | 6 | 4 | 4 | 4 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 50 | 500 | 500 | 50 | 50 | 100 | 500 | 50 | 50 | 50 |
| 1000 | 2000 | 2000 | 1000 | 1000 | 2000 | 500 | 1000 | 1400 | 1400 |
| 0.25 | 0.4 | 0.4 | 1.25 | 1.25 | 0.26 | 2 | 0.25 | 0.28 | 0.28 |
| Enable | Light Load Efficiency | Enable | Adjustable Current Limit Frequency Synchronization | Adjustable Current Limit Frequency Synchronization | Enable Light Load Efficiency | Enable | Enable | Enable | Enable |
| 100 | 98 | 98 | 100 | 100 | 100 | 93 | 100 | 100 | 100 |
| -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 |
| Automotive | Catalog | Catalog | Catalog | Automotive | Catalog | Catalog | Catalog | Catalog | Automotive |
| VSSOP | SOT-23 | VSSOP WSON | MSOP-PowerPAD VSSOP WSON | MSOP-PowerPAD | SOT-23 | VSSOP | VSSOP | VSSOP | VSSOP |
| Hysteretic | Constant on-time (COT) | Constant on-time (COT) | Constant on-time (COT) | Constant on-time (COT) | Hysteretic | Current Mode | Hysteretic | Hysteretic | Hysteretic |
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