MAX18166
High-Efficiency, 4A, Step-Down DC-DC Regulator with Internal Power Switches
Smallest, Efficient, 4A DC-DC Converter for 5V/12V Applications
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The MAX18066/MAX18166 current-mode, synchronous, DC-DC buck converters deliver an output current up to 4A with high efficiency. The devices operate from an input voltage of 4.5V to 16V and provides an adjustable output voltage from 0.606V to 90% of the input voltage. The devices are ideal for distributed power systems, notebook computers, nonportable consumer applications, and preregulation applications.
The devices feature a PWM mode operation with an internally fixed switching frequency of 500kHz (MAX18066) and 350kHz (MAX18166) capable of 90% maximum duty cycle. The devices automatically enter skip mode at light loads. The current-mode control architecture simplifies compensation design and ensures a cycle-by-cycle current limit and fast response to line and load transients. A high-gain transconductance error amplifier allows flexibility in setting the external compensation, simplifying the design and allowing for an allceramic design.
The synchronous buck regulators feature internal MOSFETs that provide better efficiency than asynchronous solutions, while simplifying the design relative to discrete controller solutions. In addition to simplifying the design, the integrated MOSFETs minimize EMI, reduce board space, and provide higher reliability by minimizing the number of external components.
Additional features include an externally adjustable soft-start, independent enable input and power-good output for power sequencing, and thermal shutdown protection. The devices offer overcurrent protection (highside sourcing) with hiccup mode during an output shortcircuit condition. The devices ensure safe startup when powering into a prebiased output.
The MAX18066/MAX18166 are available in a 2mm x 2mm, 16-bump (4 x 4 array), 0.5mm pitch wafer-level package (WLP) and are fully specified from -40°C to +85°C.
关键特性
- Feature Integration Shrinks Solution Size
- Integrated 40mΩ (High-Side) and 18.5mΩ (Low- Side) RDS-ON Power MOSFETs
- Stable with Low-ESR Ceramic Output Capacitors
- Enable Input and Power-Good Output
- Cycle-by-Cycle Overcurrent Protection
- Fully Protected Against Overcurrent (Hiccup Protection) and Overtemperature
- High Efficiency Conserves Power
- Up to 96% Efficiency (5V Input and 3.3V Output)
- Up to 93% Efficiency (12V Input and 3.3V Output)
- Automatic Skip Mode During Light Loads
- Safe, Reliable, Accurate Operation
- Continuous 4A Output Current
- ±1% Output Accuracy Over Load, Line, and Temperature
- Safe Startup Into Prebiased Output
- Programmable Soft-Start
- VDD LDO Undervoltage Lockout
- Well Suited to Distributed Power, Networking, and Computing Applications
- 4.5V to 16V Input Voltage Range
- Adjustable Output Voltage Range from 0.606V to (0.9 x VIN)
- Available in EE-Sim® Design and Simulation Tool to Slash Design Time
应用
- 分布式供电系统
- 家庭娱乐设施(TV和机顶盒)
- 网络和数据通信
- 线性稳压器的前置稳压
- 服务器、工作站与存储
