LTC3891 - 低 Iq、60V、同步降压型控制器
LTC®3891 是一款高性能、降压型开关稳压器 DC/DC 控制器，用于驱动一个全 N 沟道同步功率 MOSFET 级。该器件运用了一种恒定频率电流模式架构，因而可提供一个高达 750kHz 的可锁相频率。
50μA 的无负载静态电流延长了电池供电型系统中的工作寿命。OPTI-LOOP® 补偿的运用允许在一个很宽的输出电容和 ESR 数值范围内对瞬态响应进行优化。LTC3891 具有一个精准的 0.8V 基准和电源良好输出指示器。4V 至 60V 的宽输入电源范围囊括了众多的中间总线电压和电池化学组成。LTC3891 的输出电压可以设置在 0.8V 至 24V 之间。
TRACK / SS 引脚负责在启动期间使输出电压斜坡上升。电流折返功能可限制短路情况下的 MOSFET 热耗散。PLLIN/MODE 引脚用于在轻负载条件下选择突发模式操作、脉冲跳跃模式或连续导通模式。
特点
典型应用  | 应用
封装信息  |
| 器件型号 | 封装 | 温度 | 价格 (以 1 ~ 99 片为批量) | 价格 (以 1000 片为批量) * |
|---|---|---|---|---|
| LTC3891EFE#PBF | TSSOP-20 | E | $5.22 | $3.65 |
| LTC3891EFE#TRPBF | TSSOP-20 | E | $3.71 | |
| LTC3891EUDC#PBF | 3x4 QFN-20 | E | $4.96 | $3.47 |
| LTC3891EUDC#TRPBF | 3x4 QFN-20 | E | $3.53 | |
| LTC3891HFE#PBF | TSSOP-20 | H | $6.39 | $4.47 |
| LTC3891HFE#TRPBF | TSSOP-20 | H | $4.53 | |
| LTC3891HUDC#PBF | 3x4 QFN-20 | H | $6.10 | $4.27 |
| LTC3891HUDC#TRPBF | 3x4 QFN-20 | H | $4.33 | |
| LTC3891IFE#PBF | TSSOP-20 | I | $5.97 | $4.18 |
| LTC3891IFE#TRPBF | TSSOP-20 | I | $4.24 | |
| LTC3891IUDC#PBF | 3x4 QFN-20 | I | $5.69 | $3.98 |
| LTC3891IUDC#TRPBF | 3x4 QFN-20 | I | $4.04 | |
| LTC3891MPFE#PBF | TSSOP-20 | MP | $15.64 | $10.95 |
| LTC3891MPFE#TRPBF | TSSOP-20 | MP | $11.01 | |
| LTC3891MPUDC#PBF | 3x4 QFN-20 | MP | $15.00 | $10.50 |
| LTC3891MPUDC#TRPBF | 3x4 QFN-20 | MP | $10.56 |
演示电路板
| 器件型号 | 描述 | 价格 |
|---|---|---|
| DC1695B | LTC3891EFE Demo Board | 4.5V ≤ VIN ≤ 60V, VOUT = 3.3V @ 5A | $150.00 |
| DC1940A | LTC3891EUDC Demo Board: 16V to 60V Input, VOUT = 12V at 15A | $175.00 |
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- DN1024 - Step-Down Converter Delivers 25A at 12VOUT from Inputs Up to 60V
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- R526 - Reliability Data
- Step-Down Converter Delivers 25A at 12V Output from Inputs Up to 60V
- 60V Input Synchronous Step-Down DC/DC Controller Draws Only 50µA in Battery-Powered Systems
- LTC3891 Footprints and Symbols
- LTC3891 Demo Circuit - High Efficiency Positive to Negative Converter (12-36V to -12V @ 10A)
- LTC3891 Demo Circuit - High Voltage Synchronous Step-Down Converter with Low IQ (4.5V to 60V to 3.3V @ 5A)
- LTC3891 Demo Circuit - Low Iq, High Voltage Step-Down Converter (4.5-60V to 12V @ 15A)
- LTC4000/LTC3891 Demo Circuit - High Voltage High Current Step-Down Converter, Power Path Controller & Li-Ion Battery Charger (24-60V to 16.8V @ 6.0A)
- LTC3891 Project - Low Iq, Synchronous Step-Down Supply with Inductor DCR Current Sensing (16-55V to 12V @ 15A)
- LTC3891 Project - Low Iq, Synchronous Step-Down Supply with Inductor DCR Current Sensing (4.5-60V to 3.3V @ 5A)
- LTC3891 Project - Low Iq, Synchronous Step-Down Supply with Rsense Current Sensing (16-55V to 12V @ 15A)
- LTC3891 Project - Low Iq, Synchronous Step-Down Supply with Rsense Current Sensing (4.5-60V to 3.3V @ 5A)
