Datasheet LTC3126 (Analog Devices) - 3

LTC3126
e lecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). PVIN1 = VIN1 = 24V, PVIN2 = VIN2 = 12V, VSET1 = VSET2 = GND, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Operating Voltage After Start-Up l 2.4 42 V VIN1, VIN2 UVLO Threshold VIN1/VIN2 Rising l 2.50 2.6 V VIN1/VIN2 Falling l 2.34 2.4 V VCC UVLO Threshold VCC Rising l 2.3 2.4 V VCC Falling 2.2 2.3 V VIN1 Current in Disable ENA Low, VIN1 = 24V, VIN2 = 12V 1.35 µA ENA Low, VIN1 = 12V, VIN2 = 24V 0.55 µA VIN2 Current in Disable ENA Low, VIN2 = 24V, VIN1 = 12V 1.35 µA ENA Low, VIN2 = 12V, VIN1 = 24V 0.55 µA VIN1 Current in Standby ENA High, Buck in UVLO, VIN1 = 24V, VIN2 = 12V 1.65 µA ENA High, Buck in UVLO, VIN1 = 12V, VIN2 = 24V 0.55 µA VIN2 Current in Standby ENA High, Buck in UVLO, VIN2 = 24V, VIN1 = 12V 1.65 µA ENA High, Buck in UVLO, VIN2 = 12V, VIN1 = 24V 0.55 µA VIN1 Current, Operating from VIN2 ENA High, Buck Operating, VIN1 = 24V, VIN2 = 27V 1.2 µA VIN2 Current, Operating from VIN1 ENA High, Buck Operating, VIN2 = 24V, VIN1 = 27V 1.2 µA Burst Mode Operation Quiescent Current from VIN Not Switching, VFB = 0.850V 5.5 µA Oscillator Frequency Programmable Frequency l 200 2200 kHz RT Resistor = 33.2k l 900 1000 1100 kHz PWM/SYNC Applied Clock Frequency l 200 2200 kHz PWM/SYNC High Pulse Width 100 ns PWM/SYNC Low Pulse Width 150 ns Logic Input Threshold (ENA, DIODE, PWM/SYNC) l 0.3 0.8 1.1 V Feedback Voltage 812 818 824 mV l 804 818 832 mV Feedback Voltage Line Regulation VIN1, VIN2 = 2.4V to 42V 0.2 % Feedback Pin Current –20 1 20 nA Feedback Pin Overvoltage Comparator Threshold FB Rising, as a Percentage of the Feedback Voltage 7.4 9.8 12 % Feedback Pin Overvoltage Comparator Hysteresis 1.1 % Soft-Start Duration 7.5 ms PGOOD Threshold FB Falling, as a Percentage of the Feedback Voltage l –10.7 –8.7 –6.6 % PGOOD Threshold Hysteresis 1 % PGOOD Delay FB Falling 200 µs VREF Voltage 0.995 1.000 1.005 V l 0.982 1.000 1.018 V VREF Output Current 1 mA VREF Current Limit 13 mA VBEST Comparator Threshold VIN1 Rising, VIN2 = 24V 24.18 V VIN1 Falling, VIN2 = 24V 23.83 V VBEST Comparator Hysteresis 280 365 450 mV VBEST Comparator Delay VIN1 Falling, VIN2 = 24V 11 µs VIN2 Falling, VIN1 = 24V 40 µs VIN1, VIN2 Input Valid Threshold, Rising VSET1 = VSET2 = 1000mV l 19.8 20.0 20.2 V VSET1 = VSET2 = 500mV l 9.9 10.0 10.1 V VSET1 = VSET2 = 250mV l 4.9 5.0 5.1 V VSET1 = VSET2 = 150mV l 2.91 3.0 3.09 V 3126f For more information www.linear.com/LTC3126 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Quick Reference Operation Applications Information Typical Applications Package Description Typical Application Related Parts