Datasheet LT7101 (Analog Devices) - 3

link to page 34 link to page 35 LT7101
PIN CONFIGURATION ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = 12V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Regulator and Voltage Loop
VIN Operating Input Voltage Range 4.4 105 V VIN(UVLO) VIN Undervoltage Lockout VIN Rising l 4.36 4.50 4.64 V VIN Falling l 4.11 4.25 4.39 V VOUT Operating Output Voltage Range (Note 9) 1.0 105 V IQ VIN Input DC Supply Current (Note 8) Pulse-Skipping Mode VFB = 1.04V, EXTVCC = 3.3V 200 µA VFB = 1.04V, EXTVCC = 0V 4.4 mA Sleep Mode VFB = 1.04V, EXTVCC = 3.3V 1.0 µA VFB = 1.04V, EXTVCC = 0V 9.0 µA Shutdown RUN = 0V 0.7 1.5 µA VIN Input Current In Regulation Figure 14 Circuit, VIN = 48V, IOUT = 500μA 64 75 µA Figure 16 Circuit, VIN = 48V, IOUT = 0μA 2 µA VFB Regulated Feedback Voltage (Note 5) ITH Voltage = 0.5V to 1.2V, VIN = 4.5V to 105V VPRG1 = VPRG2 = FLOAT l 0.990 1.000 1.010 V VPRG1 = VPRG2 = INTVCC l 1.182 1.200 1.218 V VPRG1 = FLOAT, VPRG2 = INTVCC l 1.770 1.800 1.827 V VPRG1 = VPRG2 = SGND l 2.455 2.500 2.537 V VPRG1 = SGND, VPRG2 = FLOAT l 3.234 3.300 3.350 V VPRG1 = SGND, VPRG2 = INTVCC l 3.528 3.600 3.654 V VPRG1 = FLOAT, VPRG2 = SGND l 4.900 5.000 5.075 V VPRG1 = INTVCC, VPRG2 = FLOAT l 11.75 12.00 12.24 V VPRG1 = INTVCC, VPRG2 = SGND l 14.70 15.00 15.30 V Feedback Input Bias Current VPRG1 = VPRG2 = FLOAT ±2 ±10 nA VPRG1 or VPRG2 Tied to SGND or INTVCC 1.25 1.6 µA gm Error Amplifier gm ITH = 1V, Sink/Source = 5µA (Note 5) 1.52 mS tON,MIN Minimum Controllable ON-Time (Note 7) l 35 55 ns RDS(ON)TOP Top Switch On-Resistance 580 mΩ RDS(ON)BOT Bottom Switch On-Resistance 300 mΩ
Current Control and Monitoring
ILIM(AVG) Average Output Current Limit (Note 6) ICTRL = FLOAT 1.00 1.11 1.21 A ICTRL = 0.58V 0.16 0.22 0.28 A IPK Top Switch Peak Current Limit ICTRL = FLOAT l 1.43 1.64 1.85 A ICTRL = 0.58V l 0.63 0.75 0.87 A VIMON Current Monitor Output Voltage (Note 6) ISW = 1.0A 1.13 1.21 1.29 V ISW = 0.25A 0.552 0.603 0.654 V ICTRL Pin Pull-Up Current VICTRL = 0.5V l 18 20 22 µA
Start-Up and Shutdown
ISS Soft-Start Charge Current SS = 0V l 8 11 15 µA tSS(INT) Internal Soft-Start Ramp Time SS = FLOAT 1.2 ms VFB(OV) Feedback Overvoltage Protection Relative to Regulated VFB 7 10 13 % VRUN(ON) RUN Pin ON Threshold VRUN Rising l 1.16 1.21 1.26 V VRUN Falling l 1.06 1.11 1.16 V RUN Pin Hysteresis 100 mV RUN Pin Leakage Current RUN = 1.5V –10 0 10 nA Rev. 0 For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts