Datasheet RH3845MK (Analog Devices) - 3

RH3845MW
TABLE 2 : ELECTRICAL CHARACTERISTICS (Post-Irradiation) Unless specified,specifications are at TA = 25°C, VIN = 20V, VCC = BOOST = 10V, SHDN = 2V, RSET = 49.9kΩ, SENSE– = SENSE+ = 10V, SGND = PGND, SW = 0V. 10KRAD (Si) 20KRAD (Si) 50KRAD (Si) 100KRAD (Si) 200KRAD (Si) PARAMETER CONDITIONS MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX UNITS
VIN Minimum Start Voltage (Note 2) 7.5 7.5 7.5 7.5 7.5 V VIN UVLO Threshold (Falling) 4 4 4 4 4 V VIN Supply Current VCC > 9V 200 200 200 200 200 μA VIN Shutdown Current VSHDN = 0.3V 100 100 100 100 100 μA BOOST Supply Current (Note 3) 2 2 2 2 2 mA VCC Supply Current 4.5 4.5 4.5 4.5 4.5 mA VCC Current Limit –40 –40 –40 –40 –40 mA SHDN Enable Threshold (Rising) 1.30 1.5 1.30 1.5 1.30 1.5 1.30 1.5 1.30 1.5 V SHDN Hysteresis 100 180 100 180 100 180 100 180 80 180 mV Reference Voltage 1.222 1.244 1.218 1.244 1.216 1.244 1.212 1.244 1.195 1.244 V VFB Input Bias Current RH3845MW-1 ±200 ±250 ±300 ±400 ±450 nA RH3845MW-2 ±150 ±200 ±250 ±350 ±400 nA VFB Error Amp Transconductance 350 330 300 280 250 μS Error Amp Sink/Source Current 35 35 35 35 30 μA Peak Current Limit Sense Voltage 90 120 85 120 85 120 80 120 75 120 mV Soft-Start Charge Current 8 16 8 16 6 16 5 16 4 16 μA Sense Pins Common-Mode Range 36 36 36 36 36 V Sense Pins Input Current VSENSE(CM) > 4V 400 400 400 400 400 μA Reverse Protect Sense Voltage RH3845MW-2 120 120 120 120 120 mV Reverse Current Sense Voltage Offset RH3845MW-1 20 20 20 23 26 mV Switching Frequency RSET = 49.9k 270 370 270 370 270 370 270 370 270 370 kHz Programmable Frequency Range 100 500 100 500 100 500 100 500 100 500 kHz External Sync Frequency Range 100 600 100 600 100 600 100 600 100 600 kHz TG, BG Drive On Voltage 8 8 8 8 8 V TG, BG Drive Off Voltage 0.1 0.1 0.1 0.1 0.1 V
Note 1:
Stresses beyond those listed under Absolute Maximum
Note 4:
This IC includes overtemperature protection that is intended to Ratings may cause permanent damage to the device. Exposure to any protect the device during momentary overload conditions. When junction Absolute Maximum Rating condition for extended periods may affect temperatures exceed 140°C, nominally, the device will cease operation device reliability. until temperature decreases. Continuous operation above specified
Note 2:
V maximum operation temperature may impair device reliability. IN voltages below the start-up threshold (7.5V) are only supported when the VCC is externally driven above 6.5V.
Note 3:
Supply current specification does not include switch drive currents. Actual supply currents will be higher. Rev. 0 For more information www.analog.com 3 Document Outline Description Typical Application Absolute Maximum Ratings Package Information Table 1: Electrical characteristics Table 2: Electrical characteristics Electrical Characteristics: Burn-In Delta Parameters Electrical Test Requirements Total Dose Bias Circuit — Run Mode Total Dose Bias Circuit — Shutdown Mode Burn-In Circuit—Run Mode Package Description Typical Performance Characteristics