Datasheet L6981 (STMicroelectronics) - 4
| Hersteller | STMicroelectronics |
| Beschreibung | 38 V, 1.5 A synchronous step-down converter with low quiescent current |
| Seiten / Seite | 49 / 4 — L6981. Typical application circuit. Figure 3. Basic application … |
| Dateiformat / Größe | PDF / 3.5 Mb |
| Dokumentensprache | Englisch |
L6981. Typical application circuit. Figure 3. Basic application (adjustable version). Table 2. Typical application components
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L6981 Typical application circuit 3 Typical application circuit Figure 3. Basic application (adjustable version)
(*) Synchronization is allowed for LNM versions only.
Table 2. Typical application components Symbol Value Description
CIN 10 µF Input capacitor CVCC 1 µF VCC bypass capacitor CBOOT 100 nF Bootstrap capacitor COUT 22 µF Output capacitor R1 400 kΩ VOUT divider upper resistor R2 82 kΩ VOUT divider lower resistor L 33 µH Output inductor
DS13554
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Rev 1 page 4/49
Document Outline 1 Diagram 2 Pin configuration 3 Typical application circuit 4 Absolute maximum ratings 5 Electrical characteristics 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 Overvoltage protection 6.5.1 Low consumption mode part number 6.5.2 Low noise mode part number 6.6 Overcurrent protection 6.7 Thermal shutdown 7 Closing the loop 7.1 GCO(s) control to output transfer function 7.2 Error amplifier compensation network 7.3 Voltage divider 8 Design of the power components 8.1 Programmable power up threshold 8.2 External synchronization (only available for Low Noise Mode) 8.3 Output voltage adjustment 8.4 Design of the power components 8.4.1 Input capacitor selection 8.4.2 Inductor selection 8.4.3 Output capacitor selection 9 Application board 10 Efficiency curves 11 Thermal dissipation 12 Package information 12.1 SO 8L package information 13 Ordering information Revision history
(*) Synchronization is allowed for LNM versions only.
Table 2. Typical application components Symbol Value Description
CIN 10 µF Input capacitor CVCC 1 µF VCC bypass capacitor CBOOT 100 nF Bootstrap capacitor COUT 22 µF Output capacitor R1 400 kΩ VOUT divider upper resistor R2 82 kΩ VOUT divider lower resistor L 33 µH Output inductor
DS13554
-
Rev 1 page 4/49
Document Outline 1 Diagram 2 Pin configuration 3 Typical application circuit 4 Absolute maximum ratings 5 Electrical characteristics 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 Overvoltage protection 6.5.1 Low consumption mode part number 6.5.2 Low noise mode part number 6.6 Overcurrent protection 6.7 Thermal shutdown 7 Closing the loop 7.1 GCO(s) control to output transfer function 7.2 Error amplifier compensation network 7.3 Voltage divider 8 Design of the power components 8.1 Programmable power up threshold 8.2 External synchronization (only available for Low Noise Mode) 8.3 Output voltage adjustment 8.4 Design of the power components 8.4.1 Input capacitor selection 8.4.2 Inductor selection 8.4.3 Output capacitor selection 9 Application board 10 Efficiency curves 11 Thermal dissipation 12 Package information 12.1 SO 8L package information 13 Ordering information Revision history