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MAX639 High Efficiency DC-DC Converter Datasheet
Photograph
Product Details
The MAX639 is a low-power, high efficiency, step-down dc-dc converter supplying a
regulated 5V output for load currents up to 225mA.
The MAX639 has a low operating current of just 10µA and uses a current-limiting pulse
frequency modulated scheme to deliver high efficiencies over a wide range of load currents.
The MAX639 is ideal for converting a 9V battery output to +5V.
Features
- High Efficiency for a Wide Range of Load Currents
- 10µA Quiescent Current
- Output Currents Up to 225mA
- Preset or Adjustable Output Voltage 5.0V
- Low-Battery Detection Comparator
- Current-Limiting PFM Control Scheme
Pin Layout
Pin Description
| Pin Number | Description |
|---|---|
| 1 | Vout - Voltage Output |
| 2 | LBO - Low Battery Output |
| 3 | LBI - Low Battery Input |
| 4 | GND - Ground |
| 5 | Lx - MOSFET Drain |
| 6 | V+ - Positive Supply |
| 7 | Vfb - Voltage Feedback |
| 8 | SHDN - Shutdown |
Dimensional Drawing
Technical Data
