Datasheet LTC3119 (Analog Devices) - 3

LTC3119
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = PVIN = 12V, PVOUT = 5V, RT = 76.8k unless otherwise stated. PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Operating Voltage l 2.5 18 V After Start-Up (Note 4) l 0.25 18 V Output Operating Voltage l 0.8 18 V VCC Undervoltage Lockout Threshold VCC Rising l 2.35 2.4 V VCC Falling l 2.18 2.25 V VCC Undervoltage Lockout Hysteresis 60 mV Input Current in Shutdown RUN = 0V 3 µA Input Current in Sleep FB = 0.9V 31 µA Oscillator Frequency l 900 1000 1100 kHz Oscillator Operating Frequency l 400 2000 kHz PWM/SYNC Frequency Range l 400 2000 kHz PWM/SYNC Logic Threshold l 0.3 0.7 1.1 V PWM/SYNC Pulse Width Minimum Low or High Duration 100 ns PWM/SYNC Pin Current 1 50 nA Soft-Start Duration 6 ms Feedback Voltage 787 795 803 mV l 779 795 811 mV Feedback Pin Current 1 50 nA Error Amplifier Transconductance 120 µS RUN Pin Logic Threshold l 0.3 0.8 1 V RUN Pin Comparator Threshold VRUN Rising l 1.17 1.205 1.24 V RUN Pin Hysteresis Current 0.25 µA RUN Pin Hysteresis Voltage 90 mV PGOOD Threshold Percentage of FB Voltage Falling l –9.5 –8 –6.5 % PGOOD Hysteresis Percentage of FB Voltage 1.2 % PGOOD Pull Down Resistance 700 2000 Ω PGOOD Leakage VPGOOD = 18V 1 40 nA MPPC Pin Threshold l 774 798 822 mV MPPC Pin Current 1 50 nA Inductor Current Limit (Note 3) l 7 8 A Burst Mode Operation Inductor VIN > VOUT (Note 3) 0.6 A Current Limit Maximum Duty Cycle Percentage of Period SW2 is Low in Boost Mode l 90 92 % Minimum Duty Cycle Percentage of Period SW1 is High in Buck Mode l 0 % SW1, SW2 Minimum Low Time 90 ns 3119fb For more information www.linear.com/LTC3119 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Introduction PWM Mode Operation VCC Regulator Current Mode Control Error Amplifiers Current Limit and Zero Current Detection Soft-Start Maximum Power Point Control (MPPC) Burst Mode Operation Power Good Indicator Thermal Considerations Applications Information Typical Applications Package Description Revision History Typical Application Related Parts