Datasheet A7987 (STMicroelectronics) - 6
| Hersteller | STMicroelectronics |
| Beschreibung | 61 V 3A asynchronous step-down switching regulator with adjustable current limitation for automotive |
| Seiten / Seite | 37 / 6 — A7987. Electrical characteristics. Table 5. Electrical characteristics. … |
| Dateiformat / Größe | PDF / 1.4 Mb |
| Dokumentensprache | Englisch |
A7987. Electrical characteristics. Table 5. Electrical characteristics. Symbol. Parameter. Test conditions. Min. Typ. Max. Unit. DS12928
Modelllinie für dieses Datenblatt
Textversion des Dokuments
link to page 7 link to page 7 link to page 7 link to page 7 link to page 7 link to page 7
A7987 Electrical characteristics 4 Electrical characteristics
TJ = -40 °C to +125 °C, VIN = VCC = 24 V and VEN =3 V unless otherwise specified.
Table 5. Electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit
VIN Operating input voltage range 4.5 61 V ISW=0.5 A; Tj = 25 °C 0.25 0.32 Ω RDSON HS High- side RDS(on) ISW=0.5 A 0.25 0.46 Ω FSW floating; Tj = 25 °C 233 250 267 kHz Switching frequency fSW FSW floating 225 250 275 kHz Selected switching frequency RFSW=10 kW 1350 1500 1650 kHz RLIM 20 kΩ; VFB = 0.6 V; TJ = 125 °C (1) 3.2 3.7 4.4 A IPK Peak current limit RLIM 100 kΩ; VFB = 0.6 V (1) 0.69 0.84 1.0 A Ratio IPK_20k/IPK_100k (2) 4.7 ISKIP Pulse skipping peak current (2) 0.5 A VFOLD Feedback fold-back level (2) 400 mV TONMAX Maximum On- Time 12 µs TONMIN Minimum On- Time 120 150 ns TOFFMIN Minimum Off -Time (2) 360 ns VCC / VBIAS VCCH VCC UVLO rising threshold 3.85 4.10 4.30 V VCCHYST VCC UVLO hysteresis 150 250 380 mV Switch internal supply from VCC to VBIAS. 2.84 2.90 3.03 V V VBIAS ramping up from 0V. BIAS threshold Hysteresis 80 mV SWO Switch internal supply from VCC to VBIAS. VIN=VCC=24 V, VBIAS falling from 24 V to 3.35 4.05 4.90 V VCC -VBIAS threshold GND. Hysteresis 900 mV Power consumption VEN=GND; TJ=25 °C 11 16 ISHTDWN Shutdown current from VIN µA VEN=GND 23 45 LX floating, VFB=1 V, V I BIAS=GND, FSW QUIESC Quiescent current from VIN and VCC 2.5 3.0 mA floating IQOPVIN Quiescent current from VIN and VCC LX floating, V 1.0 1.3 mA FB=1 V, VBIAS=3.3 V, FSW floating IQOPVBIAS Quiescent current from VBIAS 1.6 2.2 mA Enable Device OFF level 0.06 0.30 V VEN Device ON level 0.35 0.90 V Soft-start
DS12928
-
Rev 1 page 6/37
Document Outline Cover image Product status link / summary Features Applications Description 1 Application schematic 2 Block diagram 3 Pin settings 3.1 Pin connection 3.2 Pin description 3.3 Maximum ratings 3.4 Thermal data 3.5 ESD protection 4 Electrical characteristics 5 Functional description 5.1 Oscillator and synchronization 5.2 Soft-start 5.3 Error amplifier and light-load management 5.4 Low VIN operation 5.5 Overcurrent protection 5.6 Overtemperature protection 6 Application information 6.1 Input capacitor selection 6.2 Output capacitor selection 6.3 Inductor selection 6.4 Compensation network 6.4.1 Type II compensation network 6.4.2 Type III compensation network 6.5 Thermal considerations 6.6 Layout considerations 7 Demonstration board 8 Application ideas 8.1 Positive buck-boost 8.2 Negative buck-boost 9 Package information 9.1 HTSSOP16 package information 10 Ordering information Revision history
A7987 Electrical characteristics 4 Electrical characteristics
TJ = -40 °C to +125 °C, VIN = VCC = 24 V and VEN =3 V unless otherwise specified.
Table 5. Electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit
VIN Operating input voltage range 4.5 61 V ISW=0.5 A; Tj = 25 °C 0.25 0.32 Ω RDSON HS High- side RDS(on) ISW=0.5 A 0.25 0.46 Ω FSW floating; Tj = 25 °C 233 250 267 kHz Switching frequency fSW FSW floating 225 250 275 kHz Selected switching frequency RFSW=10 kW 1350 1500 1650 kHz RLIM 20 kΩ; VFB = 0.6 V; TJ = 125 °C (1) 3.2 3.7 4.4 A IPK Peak current limit RLIM 100 kΩ; VFB = 0.6 V (1) 0.69 0.84 1.0 A Ratio IPK_20k/IPK_100k (2) 4.7 ISKIP Pulse skipping peak current (2) 0.5 A VFOLD Feedback fold-back level (2) 400 mV TONMAX Maximum On- Time 12 µs TONMIN Minimum On- Time 120 150 ns TOFFMIN Minimum Off -Time (2) 360 ns VCC / VBIAS VCCH VCC UVLO rising threshold 3.85 4.10 4.30 V VCCHYST VCC UVLO hysteresis 150 250 380 mV Switch internal supply from VCC to VBIAS. 2.84 2.90 3.03 V V VBIAS ramping up from 0V. BIAS threshold Hysteresis 80 mV SWO Switch internal supply from VCC to VBIAS. VIN=VCC=24 V, VBIAS falling from 24 V to 3.35 4.05 4.90 V VCC -VBIAS threshold GND. Hysteresis 900 mV Power consumption VEN=GND; TJ=25 °C 11 16 ISHTDWN Shutdown current from VIN µA VEN=GND 23 45 LX floating, VFB=1 V, V I BIAS=GND, FSW QUIESC Quiescent current from VIN and VCC 2.5 3.0 mA floating IQOPVIN Quiescent current from VIN and VCC LX floating, V 1.0 1.3 mA FB=1 V, VBIAS=3.3 V, FSW floating IQOPVBIAS Quiescent current from VBIAS 1.6 2.2 mA Enable Device OFF level 0.06 0.30 V VEN Device ON level 0.35 0.90 V Soft-start
DS12928
-
Rev 1 page 6/37
Document Outline Cover image Product status link / summary Features Applications Description 1 Application schematic 2 Block diagram 3 Pin settings 3.1 Pin connection 3.2 Pin description 3.3 Maximum ratings 3.4 Thermal data 3.5 ESD protection 4 Electrical characteristics 5 Functional description 5.1 Oscillator and synchronization 5.2 Soft-start 5.3 Error amplifier and light-load management 5.4 Low VIN operation 5.5 Overcurrent protection 5.6 Overtemperature protection 6 Application information 6.1 Input capacitor selection 6.2 Output capacitor selection 6.3 Inductor selection 6.4 Compensation network 6.4.1 Type II compensation network 6.4.2 Type III compensation network 6.5 Thermal considerations 6.6 Layout considerations 7 Demonstration board 8 Application ideas 8.1 Positive buck-boost 8.2 Negative buck-boost 9 Package information 9.1 HTSSOP16 package information 10 Ordering information Revision history