Description
The HX4004 is a low noise, constant frequency (400kHz) switched capacitor voltage doubler. It produces a regulated output voltage from a 2.8V to 4.5V input. Low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make the HX4004 ideally suited for small, battery-powered applications.
The HX4004 have thermal shutdown capability and can survive a continuous short circuit from VOUT to GND. Built-in soft-start circuitry prevents excessive inrush current during start-up.
High switching frequency enables the use of small ceramic capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to <1uA.
The HX4004 is available in the SOT-23-6L power packages.
Applications
Ø White LED Backlighting
Ø Li-Ion Battery Backup Supplies
Ø Local 3V to 5V Conversion
Ø Smart Card Readers
Ø PCMCIA Local 5V Supplies
Features
Ø Fixed 5V ± 4% Output
Ø VIN Range: 2.8V to 4.5V
Ø Output Current: Up to 100mA（VIN≥2.8V）
Up to 250mA（VIN≥3.6V）
Ø Constant Frequency Operation at All Loads
Ø Low Noise Constant Frequency (400kHz) Operation
Ø Automatic Soft-Start Reduces Inrush Current
Ø Shutdown Current <1μA
Ø Short-Circuit Protection
Ø No Inductors
Ø Available in Low Profile 6-Lead SOT23 Package