Datasheet LT3501 (Analog Devices) - 4

LT3501
elecTrical characTerisTics Note 4:
An internal power-on reset (POR) latch is set on the positive current flowing from the IND pin to the VOUT pin which resets the switch transition of the SHDN pin through its threshold. The output of the latch latch when the VC pin is at its high clamp. activates current sources on each SS pin which typically sink 1.5mA,
Note 7:
This is the minimum voltage across the boost capacitor needed to discharging the SS capacitor. The latch is reset when both SS pins are guarantee full saturation of the internal power switch. driven below the soft-start POR threshold or the SHDN pin is taken below
Note 8:
This IC includes overtemperature protection that is intended its threshold. to protect the device during momentary overload conditions. Junction
Note 5:
To enhance dropout operation, the output switch will be turned off temperature will exceed 125°C when overtemperature protection is active. for the minimum off-time only when the voltage across the boost capacitor Continuous operation above the specified maximum operating junction drops below the minimum boost for 100% duty cycle threshold. temperature may impair device reliability.
Note 6:
The IND to VOUT maximum current is defined as the value of
Typical perForMance characTerisTics Shutdown Threshold and Minimum Feedback Voltage vs Temperature RT/SYNC Voltage vs Temperature Input Voltage vs Temperature
0.816 1.05 3.0 0.811 MINIMUM INPUT 1.03 2.5 VOLTAGE 0.806 2.0 1.01 SHUTDOWN THRESHOLD 0.801 1.5 VOLTAGE VOLTAGE (V) VOLTAGE (V) 0.99 VOLTAGE (V) 0.796 1.0 0.97 0.791 0.5 0.786 0.95 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3501 G02 3501 G03 3501 G04
Shutdown Quiescent Current Soft-Start Source Current IND to VOUT Maximum Current vs Temperature vs Temperature vs Temperature
16 4.0 5.0 4.8 14 3.8 VVIN1 3.6 4.6 12 3.4 4.4 10 3.2 4.2 VOUT = 5V 8 3.0 4.0 3.8 CURRENT (µA) 6 2.8 V CURRENT (µA) CURRENT (A) OUT = 0V 2.6 3.6 4 2.4 3.4 2 V 2.2 3.2 VIN2 0 2.0 3.0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3501 G05 3501 G06 3501 G07 3501fd 4 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Related Parts