STMicroelectronics L6920
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. Startup Voltage vs Output Current 1.4 1.2 1 0.8 0.6 0.4 L = 47µH C = 22µF 0.2 0 30 60 90 120 150 180 Output current (mA) 4/13 L6920 3 Detailed Description 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)...| Part No. | L6920 |
|---|---|
| Datasheet | L6920 Download |
| Manufacturer |  STMicroelectronics |
| Description | 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
| Buy | Stock & Price |
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 1.1
APPLICATIONS
● ONE TO THREE CELL BATTERY DEVICES● PDA AND HAND HELD INSTRUMENTS
● CELLULAR PHONES - DIGITAL CORDLESS PHONE
● PAGERS
● GPS
● DIGITAL CAMERAS Figure 1. Application Circuit Figure 1. Package TSSOP8 Table 1. Order Codes Part Number L6920D L6920DTR Package TSSOP8 Tube Tape & Reel 2
DESCRIPTION
Internal synchronous rectifier is implemented with a 120mΩ P-channel MOSFET and, in order to improve the efficiency, a variable frequency control is implemented. VCC 2.5V L1 LX C2 SHDN LBI REF 78 1 5 L6920D 23 46 OUT FB C3 LBO GND VOUT 3.3V 500mA C1 February 2005 Rev. 2 1/13 L6920 Table 1. PinDESCRIPTION
Pin Name Function 1 FB Output voltage selector. Connect FB to GND for Vout=5V or to OUT for Vout=3.3V.
