Analog Devices / Maxim Integrated MAX17505降压DC-DC转换器
Maxim Integrated MAX17505高效率、高电压、同步整流降压、带集成MOSFET的DC-DC转换器工作在4.5V到60V的输入电压范围。提供高达1.7A和0.9V到90%Vin的输出电压。整个输出电压范围的内建补偿，免去了外部元件。器件具有峰值-电流-模式控制架构，带有MODE特性，可用于在脉冲宽度调制、脉冲频率调制或非连续导通模式等控制模式下操作器件。低电阻片上MOSFET确保满载时的高效，同时简化了电路板布局。可编程软启动特性让用户可以减少瞬态输入浪涌电流。该器件还带有输出允许/欠压锁定引脚(EN/UVLO)，允许用户在输入电压达到要求时开启器件。它有一个开-漏低电平有效RESET引脚，在成功调节输出电压时给系统提供一个延迟的电源良好信号。
The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input-voltage level. An open-drain active-low RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output voltage. The all-ceramic capacitor solution provides an ultra-compact layout with as few as eight external components.
特性
- No schottky-synchronous operation for high efficiency and reduced cost
- Internal compensation for stable operation at any output voltage
- Wide 4.5V to 60V input voltage range
- 0.9V to 90%VIN output voltage
- Delivers up to 1.7A over temperature
- 200kHz to 2.2MHz Adjustable frequency with external synchronization
- Available in a 20-Pin, 4mm x 4mm TQFN package
- Peak efficiency >90%
- PFM and DCM Modes for high light-load efficiency
- Shutdown current = 2.8µA (typ)
- Hiccup-mode current limit and autoretry startup
- Built-in output-voltage monitoring (open-drain active-low RESET pin)
- Resistor-programmable EN/UVLO threshold
- Adjustable soft-start and pre biased power-up
- -40°C to +125°C operation
应用
- Base station power supplies
- Distributed supply regulation
- General-purpose point-of-load
- High-voltage single-board systems
- Industrial power supplies
- Wall transformer regulation
Block Diagram
发布日期: 2014-04-15
| 更新日期: 2023-04-13