L6920D

The L6920 is a high efficiency step-up controller requiring only three external components to realize the conversion from the battery voltage to the selected output voltage. The start up is guaranteed at 1V and the device is operating down to 0.6V. Internal synchronous rectifier is implemented with a 120mΩ P-channel MOSFET and, in order to improve the efficiency, a variable frequency control is implemented. The L6920 is a high efficiency, low voltage step-up DC/DC converter particularly suitable for 1 to 3 cells (Li-Ion/ polymer, NiMH respectively) battery up conversion. These performances are achieved via a strong reduction of quiescent current (10μA only) and adopting a synchronous rectification, that implies also a reduced cost in the application (no external diode required). Operation is based on maximum ON time - minimum OFF time control, tailored by a current limit set to 1A.

Applications

• ONE TO THREE CELL BATTERY DEVICES
• PDA AND HAND HELD INSTRUMENTS
• CELLULAR PHONES - DIGITAL CORDLESS PHONE
• PAGERS
• GPS
• DIGITAL CAMERAS

Key features

• 0.6 TO 5.5V OPERATING INPUT VOLTAGE
• 1V START UP INPUT VOLTAGE
• INTERNAL SYNCHRONOUS RECTIFIER
• ZERO SHUT DOWN CURRENT
• 3.3V AND 5V FIXED OR ADJUSTABLE OUTPUT VOLTAGE (2V UP TO 5.2V)
• 120mΩ INTERNAL ACTIVE SWITCH
• LOW BATTERY VOLTAGE DETECTION
• REVERSE BATTERY PROTECTION