Datasheet LT3797 (Analog Devices) - 10

LT3797
PIN FUNCTIONS (QFN/LQFP) EN/UVLO (Pin 51/Pin 47):
Enable and Undervoltage
OVLO (Pin 52/Pin 48):
Overvoltage Lockout Pin. An accu- Lockout Pin. An accurate 1.22V falling threshold with rate 1.25V rising threshold with 125mV hysteresis detects externally programmable hysteresis detects when power an overvoltage condition. An overvoltage condition turns is OK to enable the integrated INTVCC power supply and off all three channels (including pulling the GATE pins to each channel switching. Rising hysteresis is generated GND and TG pins to ISP) and resets the soft-starts. Tie by the external resistor divider and an accurate internal OVLO to GND if not used. 2μA pull-down current. Above the 1.24V (typical) rising
GND (Exposed Pad Pin 53/Exposed Pad Pin 49):
Ground. threshold (but below 2.5V), EN/UVLO input bias current Solder the exposed pad directly to ground plane. is sub-μA. Below the 1.22V (typical) falling threshold, a 2μA pull-down current is enabled so the user can define the hysteresis with the external resistor selection. An undervoltage condition turns off the integrated INTVCC power supply and all the three channels and resets the soft-starts. Tie to 0.4V, or less, to disable the device and reduce VIN quiescent current below 1μA. Rev C 10 For more information www.analog.com Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Revision History Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts