Analog Devices / Maxim Integrated MAX8556/MAX8557 LDO 调节器
Maxim MAX8556/MAX8557 低压差线性调节器（LDO）可采用低至 1.425V 的输入电压工作，并能提供高达 4A 的连续输出电流，而典型压差仅为 100mV。输出电压可以设置为 0.5V 至 VIN - 0.2V 之间。MAX8556/MAX8557 被设计带有内部 p 沟道 MOSFET 通道晶体管（pass transistor），无论负载电流和压差如何都能保持 800µA 的低典型电源电流。采用 p 沟道 MOSFET 则无需使用额外的外部电源或有噪声的内部电荷泵。其他特性包括：逻辑控制的关断模式、内置式软启动、折返限流式短路保护、热超载保护。MAX8556 带有 POK 输出，当调节器输出位于其标称输出电压的±10% 以内时，会切换至高电平。MAX8557 带有上电复位输出，当输出达到其标称输出电压的 90% 并持续 140ms 后，会切换至高电平。MAX8556/MAX8557 采用带裸露焊盘的 16 引脚薄型 QFN 5mm x 5mm 封装。
The MAX8556 features a POK output that transitions high when the regulator output is within ±10% of its nominal output voltage. The MAX8557 offers a power-on reset output that transitions high 140ms after the output has achieved 90% of its nominal output voltage. The MAX8556/MAX8557 are available in a 16-pin thin QFN 5mm x 5mm package with exposed paddle.
特性
- 1.425V to 3.6V Input voltage range
- Guaranteed 4A output current
- ±1% Output accuracy over load/line/temperature
- 100mV Dropout at 4A load (typ)
- Built-in soft-start
- 800µA (typ) Operating supply current
- 150µA (max) Shutdown supply current
- Short-circuit current foldback protection
- Thermal-overload protection
- ±10% Power-OK (MAX8556)
- 140ms Power-on reset output (MAX8557)
- Fast transient response
- 16-Pin thin QFN (5mm x 5mm) package
应用
- Automated Test Equipment (ATE)
- Networking
- Optical modules
- Point-of-Load supplies
- Servers and storage devices
- Wireless base stations
Typical Operating Circuit
发布日期: 2014-02-11
| 更新日期: 2023-04-18