Analog Devices / Maxim Integrated MAX17543/44/45 降压直流-直流转换器
美信 MAX17543/44/45 高效同步降压型直流-直流转换器是集成了 MOSFET 的高效率、高压、同步降压型直流-直流转换器，采用 4.5V 到 42V 的输入进行工作。该转换器可提供 1.7A, 2.5A 或 3.5A 的电流，并产生从 0.9V 到高达 0.9 倍 VIN 的输出电压。在 -40°C 到 +125°C 的范围内，反馈（FB）电压精确到 ±1.1% 以内。MAX17543/44/45 采用峰值电流模式控制。该器件可采用脉宽调制（PWM）、脉冲频率调制（PFM）、或断续导通模式等控制方式工作。
特性
- Reduces external components and total cost
- No schottky-synchronous operation
- Internal compensation for any output voltage
- Built-in soft-start
- All-ceramic capacitors, compact layout
- Reduces number of DC-DC regulators to stock
- Wide 4.5V to 42V input
- Adjustable 0.9V to 0.9 x VIN output
- 100kHz to 2.2MHz Adjustable switching frequency with external synchronization
- Reduces power dissipation
- Peak efficiency > 90%
- PFM/DCM Enables enhanced light-load efficiency
- 2.8μA Shutdown current
- Operates reliably in adverse industrial environments
- Peak current-limit protection
- Built-in output voltage monitoring with RESET
- Programmable EN/UVLO threshold
- Monotonic startup into prebiased load
- Overtemperature protection
- -40°C to +125°C Operation
应用
- Industrial power supplies
- Distributed supply regulation
- High-voltage single-board systems
- Base station power supply
- General-purpose point-of-load
Block Diagram
发布日期: 2014-10-23
| 更新日期: 2023-04-12