数据：
LM34919B Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator 数据表 
LM34919B降压型开关稳压器具有实现低成本，高效，降压偏置稳压器所需的所有功能，能够为负载提供0.6A电流。该降压稳压器包含一个N通道降压开关，采用10引脚DSBGA封装。恒定导通时间反馈调节方案无需环路补偿，可实现快速负载瞬态响应，并简化电路实现。由于输入电压和导通时间之间的反比关系，工作频率保持恒定，线路和负载变化。当检测到电流限制时，谷值电流限制导致从恒定电压到恒定电流模式的平滑过渡，降低了频率和输出电压，而不使用折返。其他功能包括：VCC欠压锁定，热关断，栅极驱动欠压锁定和最大占空比限制器。
| Vin (Min) (V) |
| Vin (Max) (V) |
| Vout (Min) (V) |
| Vout (Max) (V) |
| Iout (Max) (A) |
| Regulated Outputs (#) |
| Switching Frequency (Min) (kHz) |
| Switching Frequency (Max) (kHz) |
| Iq (Typ) (mA) |
| Features |
| Control Mode |
| Duty Cycle (Max) (%) |
| Operating Temperature Range (C) |
| Rating |
| Package Group |
| LM34919B | LM25011-Q1 | LM34914 | LM34919B-Q1 |
|---|---|---|---|
| 6 | 6 | 8 | 6 |
| 40 | 42 | 40 | 40 |
| 2.5 | 2.51 | 2.5 | 2.5 |
| 35 | 40 | 37 | 35 |
| 0.6 | 2 | 1.25 | 0.6 |
| 1 | 1 | 1 | 1 |
| 50 | 50 | 50 | 50 |
| 2600 | 2000 | 1300 | 2600 |
| 0.78 | 1.2 | 0.57 | 0.78 |
| Enable | Adjustable Current Limit | Enable | Enable |
| Constant on-time (COT) | Constant on-time (COT) | Constant on-time (COT) | Constant on-time (COT) |
| 99 | 99 | 97 | 99 |
| -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 |
| Catalog | Automotive | Catalog | Automotive |
| DSBGA | MSOP-PowerPAD | WSON | DSBGA |
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