Datasheet LT3150 (Analog Devices) - 6

LT3150
W U TYPICAL PERFOR A CE CHARACTERISTICS Linear Regulator Controller SHDN2 Source Current SHDN2 Low Clamp Voltage vs Temperature vs Temperature
–10 0.25 – 11 – 12 0.20 µA) – 13 – 14 0.15 – 15 – 16 0.10 – 17 – 18 0.05 SHDN2 SOURCE CURRENT ( SHDN2 LOW CLAMP VOLTAGE (V) – 19 – 20 0 –75 – 50 –25 0 25 50 75 100 125 150 175 – 75 – 50 – 25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) TEMPERATURE (°C) 3150 G18 3150 G19
SHDN2 High Clamp Voltage vs Temperature SHDN2 Hysteresis vs Temperature
2.1 150 140 2.0 130 120 1.9 110 1.8 100 90 1.7 80 SHDN2 HYSTERESIS (mV) 70 SHDN2 HIGH CLAMP VOLTAGE (V) 1.6 60 1.5 50 –75 – 50 –25 0 25 50 75 100 125 150 175 –75 – 50 –25 0 25 50 75 100 125 150 175 TEMPERATURE (°C) TEMPERATURE (°C) 3150 G20 3150 G21
U U U PI FU CTIO S SW (Pin 1):
Boost Converter Switch Pin. Connect induc- charges a capacitor placed in series with SHDN2 to GND tor/diode here. Minimize trace area at this pin to keep EMI and performs a current limit time-out function. The pin is down. also the input to a comparator referenced to VREF (1.21V). When the pin pulls above V
SWGND (Pin 2):
Switch Ground. Tie directly to the local REF, the comparator latches the gate drive to the external MOSFET off. The comparator ground plane and the GNDs at Pins 6 and 15. typically has 100mV of hysteresis and the SHDN2 pin can
VIN1 (Pin 3):
Boost Converter Input Supply Pin. Must be be pulled low to reset the latchoff function. This pin locally bypassed. provides overvoltage protection or thermal shutdown
SHDN2 (Pin 4):
This is a multifunction shutdown pin that protection when driven from various resistor divider provides GATE drive latchoff capability. A 15µA current schemes. source, that turns on when current limit is activated, 3150f 6