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LT1944EMS Datasheet(PDF) 3 Page - Linear Technology |
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LT1944EMS Datasheet(HTML) 3 Page - Linear Technology |
3 / 8 page 3 LT1944 TYPICAL PERFOR A CE CHARACTERISTICS Switch Saturation Voltage (VCESAT) Quiescent Current Feedback Pin Voltage and Bias Current TEMPERATURE ( °C) –50 –25 0 25 50 75 100 1944 G01 0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 ISWITCH = 500mA ISWITCH = 300mA TEMPERATURE ( °C) –50 1944 G02 1.25 1.24 1.23 1.22 1.21 1.20 50 40 30 20 10 0 CURRENT VOLTAGE –25 0 25 50 75 100 TEMPERATURE ( °C) 1944 G03 25 23 21 19 17 15 –50 –25 0 25 50 75 100 VIN = 12V VIN = 1.2V VFB = 1.23V NOT SWITCHING PI FU CTIO S FB1 (Pin 1): Feedback Pin for Switcher 1. Set the output voltage by selecting values for R1 and R2. SHDN1 (Pin 2): Shutdown Pin for Switcher 1. Tie this pin to 0.9V or higher to enable device. Tie below 0.25V to turn it off. GND (Pin 3): Ground. Tie this pin directly to the local ground plane. SHDN2 (Pin 4): Shutdown Pin for Switcher 2. Tie this pin to 0.9V or higher to enable device. Tie below 0.25V to turn it off. FB2 (Pin 5): Feedback Pin for Switcher 2. Set the output voltage by selecting values for R1B and R2B. SW2 (Pin 6): Switch Pin for Switcher 2. This is the collector of the internal NPN power switch. Minimize the metal trace area connected to the pin to minimize EMI. PGND (Pins 7, 9): Power Ground. Tie these pins directly to the local ground plane. Both pins must be tied. VIN (Pin 8): Input Supply Pin. Bypass this pin with a capacitor as close to the device as possible. SW1 (Pin 10): Switch Pin for Switcher 1. This is the collector of the internal NPN power switch. Minimize the metal trace area connected to the pin to minimize EMI. TEMPERATURE ( °C) 1944 G04 550 500 450 400 350 300 250 –50 –25 0 25 50 75 100 VIN = 1.2V VIN = 12V TEMPERATURE ( °C) 1944 G05 400 350 300 250 200 150 100 50 0 –50 –25 0 25 50 75 100 VIN = 12V VIN = 1.2V SHUTDOWN PIN VOLTAGE (V) 1944 G03 25 20 15 10 5 0 0 5 10 15 25 °C 100 °C Switch Off Time Shutdown Pin Current Switch Current Limit |
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