DIO5151数据手册DIOO中文资料规格书

描述 Description

The DIO5151 is a current-regulated charge pump, ideal for powering high brightness LEDs for camera flash applications. The charge pump can be set to regulate two current levels for flash and torch modes. \
The DIO5151 automatically switches modes between step-up and step-down, ensuring that LED current does not depend on the forward voltage. It switches at 2 MHz, allowing the use of tiny components. The supply voltage ranges from 3 V to 5.5 V and is ideally suited for all applications powered by a single Li-ion battery cell or three to four NiCd, NiMH, or Alkaline battery cells. \
The DIO5151 also features a very low shutdown current, an automatic soft-start mode to limit inrush current, as well as overcurrent, over voltage and over-thermal shutdown control. A low current sense reference voltage (47 mV) allows the use of small 0603 current sensing resistors. \
The DIO5151 is available in Green DFN2*2-8, DFN2*2.2-8, DFN3*3-10 package and is specified over an ambient temperature range of -40°C to +85°C.

特性 Features

• Output Current:
  DIO5151CN8/DIO5151ED8: 700 mA   DIO5151CD10: 1 A
• Up to 90% efficiency in torch mode
• Adjustable flash mode current
• 1× and 2× automatic modes for high efficiency
• Input voltage range: 3 V to 5.5 V
• Minimum external components: No inductors
• High frequency operation: 2 MHz
• Low 47 mV reference for low loss sensing
• IQ < 1 μA in shutdown
• Built-in soft-start limits inrush current
• Low input and output ripple and low EMI
• 240 ms flash timer control
• Output over-voltage protection
• Output open and output short protection
• Overcurrent and over-temperature protection
• Package: DFN2*2-8, DFN2*2.2-8, DFN3*3-10

应用 Application

• Cellular telephones
• Digital still cameras
• Mobile internet device
• USB Bus-powered chargers