Converters | NCP1421
概览
NCP1421 是一款单片微功率高频步升开关转换器集成电路，专门设计用于负载高达 600 mA 的电池供电手持电子产品。它集成了同步整流，从而提高能效，且无需外部肖特基二极管。高开关频率（可达 1.2 MHz）支持使用薄型、小尺寸的电感器和输出电容。禁用此器件时，LX 或 BAT 到 OUT 的内部传导路径完全阻断，OUT 引脚与电池隔离。真切断功能降低了关断电流，通常只有 50nA。还集成了振荡消除器，以消除非连续传导模式下的高频振铃。此外，电池电量低检测器、逻辑控制关断、逐周期电流限制和高温关断为各种电池供电应用提供了增值功能。上述功能全部打开时，静态电源电流通常仅为 8.5μA。此器件采用紧凑小巧的 Micro8 封装。
- Personal Digital Assistants (PDA)
- Handheld Digital Audio Products
- Camcorders and Digital Still Cameras
- Handheld Instruments
- Conversion from one to two Alkaline, NiMH, NICd Battery Cells to 3.0-5.0V or one Lithium-ion cell to 5.0V
- High Efficiency:
94% for 3.3 V Output at 200 mA from 2.0 V Input
84% for 3.3 V Output at 500 mA from 2.5 V Input - High Switching Frequency, up to 1.2 MHz (Not Hitting Current Limit)
- True-Cutoff Function Reduces Device Shutdown Current to typically 50nA
- Anti-Ringing Ring-Killer for Discontinuous Conduction Mode
- High Accuracy Reference Output, 1.2V 1 1.5%,
can supply 2.5mA Loading Current when VOUT > 3.3V - Low Quiescent Current of 8.5 µA
- Integrated Low-Battery Detector
- Open Drain Low -Battery Detector Output
- 1.0V Startup at No Load Guaranteed
- Output Voltage from 1.5V to 5.0V Adjustable
- 1.5 A Cycle-by-Cycle Current Limit
- Multi-function Logic Controlled Shutdown Pin
- On Chip Thermal Shutdown with Hysteresis
- Output Current up to 600mA at VIN=2.5V and VOUT=3.3V
- Housed in Space Saving and Low Profile Micro8 package
- Pb-Free Package is Available
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