Datasheet LTC3307A (Analog Devices) - 3

LTC3307A
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range (Note 2), otherwise specifications are at TA = 25°C; VIN = 3.3V, VEN = VIN, MODE/SYNC = Float, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply
Operating Supply Voltage (VIN) l 2.25 5.5 V VIN Undervoltage Lockout VIN Rising l 2.0 2.1 2.2 V VIN Undervoltage Lockout Hysteresis 150 mV VIN Quiescent Current in Shutdown VEN = 0.1V 1 2 µA VIN Quiescent Current (Note 3) Burst Mode Operation, Sleeping 40 60 µA All Modes, Not Sleeping 1.2 2 mA Enable Threshold VEN Rising l 0.375 0.4 0.425 V Enable Threshold Hysteresis 50 mV EN Pin Leakage VEN =0.5V ±20 nA
Voltage Regulation
Regulated Feedback Voltage (VFB) l 0.495 0.5 0.505 V Feedback Voltage Line Regulation VIN = 2.25V to 5.5V 0.015 0.05 %/V FB Pin Input Current VFB = 0.5V ±20 nA Minimum On Time (tON,min) VIN = 5.5V l 22 42 ns Maximum Duty Cycle l 100 % Top Switch ON-Resistance 31 mΩ Bottom Switch ON-Resistance 8 mΩ Top Switch Current Limit (IPEAKMAX) VOUT/VIN ≤ 0.2 4.5 4.8 5.1 A Bottom Switch Current Limit (IVALLEYMAX) 3.9 A Bottom Switch Reverse Current Limit (IREVMAX) Forced Continuous Mode –0.75 –1.5 –2.25 A SW Leakage Current VEN = 0.1V ±100 nA
Power Good and Soft-Start
PGOOD Rising Threshold As a Percentage of the Regulated VOUT l 97 98 99 % PGOOD Hysteresis l 0.7 1.2 1.7 % Overvoltage Rising Threshold As a Percentage of the Regulated VOUT l 107 110 114 % Overvoltage Hysteresis l 1 2.2 3.5 % PGOOD Delay 120 µs PGOOD Pull Down Resistance VPGOOD = 0.1V 10 20 Ω PGOOD Leakage Current VPGOOD = 5.5V 20 nA Soft-Start Duration VOUT rising from 0V to PGOOD Threshold l 0.25 1 3 ms
Oscillator and MODE/SYNC
Default Oscillator Frequency l 1.9 2 2.1 MHz Oscillator Frequency with RT = 34.8kΩ l 1.9 2 2.1 MHz Frequency Range RT Programming and Synchronization l 1 3 MHz Minimum SYNC High or Low Pulse Width l 40 ns SYNC Pulse Voltage Levels Level High l 1.2 V Level Low l 0.4 V MODE/SYNC No Clock Detect Time 10 µs MODE/SYNC Pin Threshold For Programming Pulse Skip Mode l 0.1 V For Programming Forced Continuous Mode l 1.0 Float VIN – 1.0 V For Programming Burst Mode Operation l VIN – 0.1 V Rev. A 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 Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts