Datasheet L6983 (STMicroelectronics) - 6

L6983 Typical application circuit 3 Typical application circuit Figure 3. Basic application (adjustable version)
L6983 RPGOOD VIN PGOOD VIN RFILT VIN BOOT C L BOOT VINLDO SW VOUT EN/CLKIN SW R FSW RFBH FSW VBIAS CIN CFILT VCC VOUT/FB COUT C VCC AGND PGND RFBL AGND E.P. PGND GND GND
Table 2. Typical application component Symbol Value Description
CIN 10 µF Input capacitor RFILT 0.1 kΩ VINLDO filter resistor CFILT 1 µF VINLDO filter capacitor CVCC 1 µF VCC bypass capacitor CBOOT 100 nF Bootstrap capacitor COUT 40 µF Output capacitor RFBH 400 kΩ VOUT divider upper resistor RFBL 82 kΩ VOUT divider lower resistor L 4.7 µH (FSW = 1 MHz) Output inductor RPGOOD 1 MΩ PGOOD resistor RFSW 10 kΩ FSW setting resistor
DS13116
-
Rev 1 page 6/63
Document Outline 1 Diagram 2 Pin configuration 3 Typical application circuit 4 Absolute maximum ratings 4.1 ESD protection 4.2 Thermal characteristics 5 Electrical characteristics 5.1 Frequency selection table 6 Functional description 6.1 Enable 6.2 Soft-start 6.3 Undervoltage lockout 6.4 Light-load operation 6.4.1 Low consumption mode (LCM) 6.4.2 Low noise mode (LNM) 6.4.3 Efficiency for low consumption mode and low noise mode part number 6.4.4 Load regulation for low consumption mode and Low noise mode part number 6.5 Switch-over feature 6.6 Spread spectrum 6.7 Overvoltage protection 6.8 Overcurrent protection 6.9 Thermal shutdown 6.10 Power Good 7 Closing the loop 7.1 GCO(s) control to output transfer function 7.2 Error amplifier compensation network 7.3 Voltage divider 8 Application notes 8.1 Programmable power up threshold 8.2 External synchronization (available for low noise mode only) 8.3 Output voltage adjustment 8.4 Switching frequency 8.5 Design of the power components 8.5.1 Input capacitor selection 8.5.2 Inductor selection 8.5.3 Output capacitor selection 9 Application board 10 Efficiency curves 11 Thermal dissipation 12 Package information 12.1 QFN16 (3x3 mm) package information 13 Ordering information Revision history