Datasheet LT8550 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 4-Phase DC/DC Expander with Internal Gate Drivers for Buck Converters |
| Pages / Page | 34 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 3.2 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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LT8550
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, REG = 5V, VCC = 5V, SHDN = High, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operating Voltage Range For Min Spec VCC, REG = 0V l 3.6 80 V VIN Quiescent Current REG = VCC = 5V, REGDRV REGIS Floating 800 µA VIN Quiescent Current in Shutdown 2 µA VCC Quiescent Current Not Switching 5 mA VCC Undervoltage Lockout VCC Falling, REG = VCC l 3.3 3.55 3.8 V VCC Undervoltage Lockout Hysteresis REG = VCC 0.1 V SHDN Input Voltage High SHDN Falling l 1.05 1.15 1.25 V SHDN Input Voltage High Hysteresis 60 mV SHDN Input Voltage Low Device Disabled, Low Quiescent Current, VCC = 3V, REG = 3V l 0.3 V SHDN Pin Bias Current VSHDN = 3V 0 1 µA VSHDN = 12V 8.5 20 µA MODE Low Falling Threshold Slave LT8550 l 0.5 V MODE High Rising Threshold Slave LT8550 l 4.5 V MODE Output Voltage Low Master LT8550, 200µA into MODE Pin 50 mV MODE Output Voltage High Master LT8550, 20µA Out of MODE Pin 4.8 V MODE Pin Impedance in Middle State Master LT8550 9 kΩ ENOUT Output Voltage Low Master LT8550, 1mA into ENOUT Pin, VCC, REG in UVLO 60 mV ENOUT Leakage Current ENOUT = 5V, REG, VCC = 3V 0.2 1 µA ENOUT Rising Threshold 2.1 V ENOUT Threshold Hysteresis 0.4 V
Current Sensing
Maximum Positive Current Sense Voltage, ILIM = 0V, ISNn = 12V, ISPn Rising l 27 30 32.5 mV (ISPn-ISNn) ILIM = REG, ISNn = 12V, ISPn Rising l 56 60 64 mV ILIM = Float, ISNn = 12V, ISPn Rising l 84.5 90 95.5 mV Maximum Negative Current Sense Voltage, ILIM = 0V, ISNn = 12V, ISPn Falling l 26.5 30 33 mV (ISNn-ISPn) ILIM = REG, ISNn = 12V, ISPn Falling l 55.5 60 64.5 mV ILIM = Float, ISNn = 12V, ISPn Falling l 84 90 96 mV ISP, ISN Common Mode Operating Voltage l 0 80 V Range ISPn, ISNn Common Mode Operating l 0 80 V Voltage Range ILIM High Rising Threshold l 4.65 V ILIM High Threshold Hysteresis 90 mV ILIM Low Falling Threshold l 0.3 V ILIM Low Threshold Hysteresis 80 mV ILIM Impedance at Floating 11 kΩ IAMPP Output Voltage (ISP-ISN) = 30mV, ILIM = 0V, Master LT8550, ISN = 12V l 2.33 2.40 2.47 V (ISP-ISN) = 0mV, ILIM = 0V, Master LT8550, ISN = 12V l 1.33 1.40 1.47 V (ISP-ISN) = –30mV, ILIM = 0V, Master LT8550, ISN = 12V l 0.33 0.40 0.47 V (ISP-ISN) = 60mV, ILIM = REG, Master LT8550, ISN = 12V l 2.33 2.40 2.47 V (ISP-ISN) = 0mV, ILIM = REG, Master LT8550, ISN = 12V l 1.35 1.40 1.45 V (ISP-ISN) = –60mV, ILIM = REG, Master LT8550, ISN = 12V l 0.34 0.40 0.46 V (ISP-ISN) = 90mV, ILIM = Float, Master LT8550, ISN = 12V l 2.33 2.40 2.47 V (ISP-ISN) = 0mV, ILIM = Float, Master LT8550, ISN = 12V l 1.35 1.40 1.45 V (ISP-ISN) = –90mV, ILIM = Float, Master LT8550, ISN = 12V l 0.34 0.40 0.46 V Rev. 0 For more information www.analog.com 3
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, REG = 5V, VCC = 5V, SHDN = High, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operating Voltage Range For Min Spec VCC, REG = 0V l 3.6 80 V VIN Quiescent Current REG = VCC = 5V, REGDRV REGIS Floating 800 µA VIN Quiescent Current in Shutdown 2 µA VCC Quiescent Current Not Switching 5 mA VCC Undervoltage Lockout VCC Falling, REG = VCC l 3.3 3.55 3.8 V VCC Undervoltage Lockout Hysteresis REG = VCC 0.1 V SHDN Input Voltage High SHDN Falling l 1.05 1.15 1.25 V SHDN Input Voltage High Hysteresis 60 mV SHDN Input Voltage Low Device Disabled, Low Quiescent Current, VCC = 3V, REG = 3V l 0.3 V SHDN Pin Bias Current VSHDN = 3V 0 1 µA VSHDN = 12V 8.5 20 µA MODE Low Falling Threshold Slave LT8550 l 0.5 V MODE High Rising Threshold Slave LT8550 l 4.5 V MODE Output Voltage Low Master LT8550, 200µA into MODE Pin 50 mV MODE Output Voltage High Master LT8550, 20µA Out of MODE Pin 4.8 V MODE Pin Impedance in Middle State Master LT8550 9 kΩ ENOUT Output Voltage Low Master LT8550, 1mA into ENOUT Pin, VCC, REG in UVLO 60 mV ENOUT Leakage Current ENOUT = 5V, REG, VCC = 3V 0.2 1 µA ENOUT Rising Threshold 2.1 V ENOUT Threshold Hysteresis 0.4 V
Current Sensing
Maximum Positive Current Sense Voltage, ILIM = 0V, ISNn = 12V, ISPn Rising l 27 30 32.5 mV (ISPn-ISNn) ILIM = REG, ISNn = 12V, ISPn Rising l 56 60 64 mV ILIM = Float, ISNn = 12V, ISPn Rising l 84.5 90 95.5 mV Maximum Negative Current Sense Voltage, ILIM = 0V, ISNn = 12V, ISPn Falling l 26.5 30 33 mV (ISNn-ISPn) ILIM = REG, ISNn = 12V, ISPn Falling l 55.5 60 64.5 mV ILIM = Float, ISNn = 12V, ISPn Falling l 84 90 96 mV ISP, ISN Common Mode Operating Voltage l 0 80 V Range ISPn, ISNn Common Mode Operating l 0 80 V Voltage Range ILIM High Rising Threshold l 4.65 V ILIM High Threshold Hysteresis 90 mV ILIM Low Falling Threshold l 0.3 V ILIM Low Threshold Hysteresis 80 mV ILIM Impedance at Floating 11 kΩ IAMPP Output Voltage (ISP-ISN) = 30mV, ILIM = 0V, Master LT8550, ISN = 12V l 2.33 2.40 2.47 V (ISP-ISN) = 0mV, ILIM = 0V, Master LT8550, ISN = 12V l 1.33 1.40 1.47 V (ISP-ISN) = –30mV, ILIM = 0V, Master LT8550, ISN = 12V l 0.33 0.40 0.47 V (ISP-ISN) = 60mV, ILIM = REG, Master LT8550, ISN = 12V l 2.33 2.40 2.47 V (ISP-ISN) = 0mV, ILIM = REG, Master LT8550, ISN = 12V l 1.35 1.40 1.45 V (ISP-ISN) = –60mV, ILIM = REG, Master LT8550, ISN = 12V l 0.34 0.40 0.46 V (ISP-ISN) = 90mV, ILIM = Float, Master LT8550, ISN = 12V l 2.33 2.40 2.47 V (ISP-ISN) = 0mV, ILIM = Float, Master LT8550, ISN = 12V l 1.35 1.40 1.45 V (ISP-ISN) = –90mV, ILIM = Float, Master LT8550, ISN = 12V l 0.34 0.40 0.46 V Rev. 0 For more information www.analog.com 3
