说明
MIC21LV33是一款恒定导通时间、双相同步降压控制器,具有独特的自适应on时间控制架构,具有Hyperlight Load®和相位脱落功能。MIC21LV33在4.5V至36V的输入电源范围内工作,可用于提供高达50A的输出电流。只要提供5V的外部VDD,输入电压就可以降低到2V。MIC21LV33的输出电压可调至0.6V,在整个工作温度下保证精度为±1%。在-40°C至+105°C的有限温度范围内,参考精度也保证为±0.5%。MIC21LV33的可编程开关频率为每相100kHz至1MHz。Hyper-Speed Control®架构支持在中至重载条件下的超快瞬态响应。软启动也可通过电容器进行外部编程,从而实现在重负载下的安全启动。MIC21LV33具有用于精确输出电压控制的远程感测放大器,以及用户可选择的自动断相,以提高中等负载下的效率。该控制器提供了下垂功能,用于实现自适应电压缩放和控制,以提高负载瞬态响应。MIC21LV33提供了全套保护功能,以确保在故障条件下对IC进行保护。其中包括低电压锁定,以确保在功率暂降条件下正常运行,可编程软启动,以减少浪涌电流,过电压放电,打嗝模式短路保护和热停堆。MIC21LV33有32引脚5mm x 5mm VQFN封装,结工作温度范围为-40°C至+125°C。
特性
- • Input Voltage Range: 4.5V to 36V
- • Input Down to 2V when VDD = 5V from External Supply
- • Adjustable Output Voltage from 0.6V to 28V
- • 0.6V Internal Reference with ±1% Accuracy
- • ±0.5% Reference Accuracy for -40°C to 105°C
- • HyperLight Load® and Automatic Phase Shedding
- • 100 kHz to 1 MHz Switching Frequency per Phase
- • High-Voltage Internal 5V LDO for Single-Supply Operation
- • Droop Feature to Support Adaptive Voltage Positioning (AVP)
- • Programmable Current Limit and Hiccup Mode Short-Circuit Protection
- • Thermal Shutdown with Hysteresis
- • -40°C to +125°C Junction Temperature Range
- • Programmable Current Limit and Hiccup Mode Short-Circuit Protection
- • Remote Sense Amplifier for Tight Output Regulation
- • Supports Start-up to Pre-Bias Output
- • External Programmable Soft Start to Reduce Inrush Current
- • Accurate Current Balancing Between Phases
- • Compact Size 5 mm x 5 mm 32-Pin VQFN Package
参数
类型 | 描述 |
Configuration | Dual Phase |
Current Limit / Short Circuit Protection | 1 |
Max Duty Cycle (%) | 80 |
Enable Pin | 1 |
External Clock Sync | 0 |
Input UVLO Typ (V) | 4.3 |
Internal Compensation | 0 |
Internal Voltage Bias | 1 |
Iq Off (µA) | 25 |
MaximumInputVoltage | 36 |
MaximumOutputVoltage | 28 |
MinimumInputVoltage | 4.5 |
MinimumOutputVoltage | 0.6 |
Operating Supply Current (mA) | 5 |
PFM, Discontinuous, Hyperlight load, or Skip Mode | 1 |
Package | 32/VQFN |
Power Good Signal | 1 |
Driver Type | Analog Controller |
Soft Start | 1 |
Supported Outputs | 1 |
Supported Topologies | Buck |
Typical Tolerance (%) | 0.5 |
Operating Temp Range (°C) | -40°C to 105°C |
Max Continuous Current per Output | 0 |
Max Driver Output Voltage (V) | 5.4 |
Minimum Driver Output Voltage (V) | 4.5 |



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