Datasheet L6981 (STMicroelectronics) - 6
| 制造商 | STMicroelectronics |
| 描述 | 38 V, 1.5 A synchronous step-down converter with low quiescent current |
| 页数 / 页 | 49 / 6 — L6981. Electrical characteristics. Table 6. Electrical characteristics TJ … |
| 文件格式/大小 | PDF / 3.5 Mb |
| 文件语言 | 英语 |
L6981. Electrical characteristics. Table 6. Electrical characteristics TJ = 25 °C, VIN = 24 V unless otherwise specified
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L6981 Electrical characteristics 5 Electrical characteristics Table 6. Electrical characteristics TJ = 25 °C, VIN = 24 V unless otherwise specified. Symbol Parameter Test Conditions Min. Typ. Max. Unit
VIN Operating input voltage range 3.5 38 V VINH VCC rising threshold 2.3 3.3 V VINL VCC UVLO falling threshold 2.15 3.15 V No slope contribution 2 2.3 A IPK (1) Peak current limit Full slope contribution 1.55 1.8 A IVY Valley current limit 1.7 2 2.3 A ISKIP (1)(2) Skip current limit 0.35 A IVY_SINK (1) Reverse current limit LNM or VOUT overvoltage 1.25 1.5 1.75 A RDSON_HS High-side RDSON 0.175 Ω RDSON_LS Low-side RDSON 0.125 Ω FSW Switching frequency 360 400 440 KHz TOFF_MIN Minimum OFF time 185 ns TON_MIN Minimum ON time 85 ns
Enable
Rising 0.7 V VWAKE_UP Wakeup threshold Falling 0.2 V Rising 1.08 1.2 1.32 V VEN Enable threshold Hysteresis 0.2 V
VCC regulator
VCC LDO output voltage 3.0 3.3 3.6 V
Power consumption
ISHTDWN Shutdown current from VIN EN = GND 2 3 μA
LCM Device
IQ_OPVIN Quiescent current from VIN 20 35 60 μA
LNM Device
IQ_OPVIN Quiescent current from VIN 1.6 2.3 3 mA
Soft start
TSS Internal soft-start 1 1.3 1.6 ms
Error amplifier
Adjustable version TJ = 25 °C 0.845 0.85 0.855 V VFB Voltage feedback Adjustable version 0.842 0.85 0.858 V TJ = -40 °C ≤ TJ ≤ 125 °C (3)
Overvoltage protection
VOVP Overvoltage trip (VOVP/VREF) 115 120 125 % VOVP_HYST Overvoltage Hysteresis 1 2 6 %
DS13554
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Rev 1 page 6/49
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
L6981 Electrical characteristics 5 Electrical characteristics Table 6. Electrical characteristics TJ = 25 °C, VIN = 24 V unless otherwise specified. Symbol Parameter Test Conditions Min. Typ. Max. Unit
VIN Operating input voltage range 3.5 38 V VINH VCC rising threshold 2.3 3.3 V VINL VCC UVLO falling threshold 2.15 3.15 V No slope contribution 2 2.3 A IPK (1) Peak current limit Full slope contribution 1.55 1.8 A IVY Valley current limit 1.7 2 2.3 A ISKIP (1)(2) Skip current limit 0.35 A IVY_SINK (1) Reverse current limit LNM or VOUT overvoltage 1.25 1.5 1.75 A RDSON_HS High-side RDSON 0.175 Ω RDSON_LS Low-side RDSON 0.125 Ω FSW Switching frequency 360 400 440 KHz TOFF_MIN Minimum OFF time 185 ns TON_MIN Minimum ON time 85 ns
Enable
Rising 0.7 V VWAKE_UP Wakeup threshold Falling 0.2 V Rising 1.08 1.2 1.32 V VEN Enable threshold Hysteresis 0.2 V
VCC regulator
VCC LDO output voltage 3.0 3.3 3.6 V
Power consumption
ISHTDWN Shutdown current from VIN EN = GND 2 3 μA
LCM Device
IQ_OPVIN Quiescent current from VIN 20 35 60 μA
LNM Device
IQ_OPVIN Quiescent current from VIN 1.6 2.3 3 mA
Soft start
TSS Internal soft-start 1 1.3 1.6 ms
Error amplifier
Adjustable version TJ = 25 °C 0.845 0.85 0.855 V VFB Voltage feedback Adjustable version 0.842 0.85 0.858 V TJ = -40 °C ≤ TJ ≤ 125 °C (3)
Overvoltage protection
VOVP Overvoltage trip (VOVP/VREF) 115 120 125 % VOVP_HYST Overvoltage Hysteresis 1 2 6 %
DS13554
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Rev 1 page 6/49
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