Beskrivning
Regulated 5V Charge-Pump DC-DC Converter
The MAX619 step-up charge-pump DC-DC converter delivers a regulated 5V ±4% output at 50mA over temperature. The input voltage range is 2V to 3.6V (two battery cells). The complete MAX619 circuit fits into less than 0.1in2 of board space because it requires only four external capacitors: two 0.22uF flying capacitors, and 10uF capacitors at the input and output. Low operating supply current (150uA max) and low shutdown supply current (1uA max) make this device ideal for small, portable, and battery-powered applications. When shut down, the load is disconnected from the input.
Features
* Regulated 5V ±4% Charge Pump
* Output Current Guaranteed over Temperature
– 20mA (VIN = 2V)
– 50mA (VIN = 3V)
* 2V to 3.6V Input Range
* No Inductors; Very Low EMI Noise
* Ultra-Small Application Circuit (0.1in2)
* Uses Small, Inexpensive Capacitors
* 500kHz Internal Oscillator
* Logic-Controlled 1µA Max Shutdown Supply Current * Shutdown Disconnects Load from Input
Applications
* Two Battery Cells to 5V Conversion * Local 3V-to-5V Conversion
* Portable Instruments & Handy-Terminals * Battery-Powered Microprocessor-Based Systems
* 5V Flash Memory Programmer
* Minimum Component DC-DC Converters
* Remote Data-Acquisition Systems
* Compact 5V Op-Amp Supply
* Regulated 5V Supply from Lithium Backup Battery
* Switching Drive Voltage for MOSFETs in
* Low-Voltage Systems
