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LT1173 Datasheet(PDF) 4 Page - Linear Technology |
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LT1173 Datasheet(HTML) 4 Page - Linear Technology |
4 / 16 page LT1173 4 CC HARA TERISTICS A TYPICALPERFOR CE LT1173 • BD02 IN V GND SET AO A2 1.245V REFERENCE A1 OSCILLATOR DRIVER R1 SW1 SW2 LIM I Ω R2 753k SENSE LT1173-5: LT1173-12: R1 = 250k R1 = 87.4k Ω Ω GAIN BLOCK/ ERROR AMP COMPARATOR LT1173 • BD01 IN V GND SET AO 1.245V REFERENCE A1 A2 DRIVER FB SW1 SW2 LIM I OSCILLATOR GAIN BLOCK/ ERROR AMP COMPARATOR LT1173 LT1173-5, -12 I DAGRA BLOCK S ILIM (Pin 1): Connect this pin to VIN for normal use. Where lower current limit is desired, connect a resistor between ILIM and VIN. A 220Ω resistor will limit the switch current to approximately 400mA. VIN (Pin 2): Input supply voltage. SW1 (Pin 3): Collector of power transistor. For step-up mode connect to inductor/diode. For step-down mode connect to VIN. SW2 (Pin 4): Emitter of power transistor. For step-up mode connect to ground. For step-down mode connect to inductor/diode. This pin must never be allowed to go more than a Schottky diode drop below ground. GND (Pin 5): Ground. AO (Pin 6): Auxiliary Gain Block (GB) output. Open collec- tor, can sink 100 µA. SET (Pin 7): GB input. GB is an op amp with positive input connected to SET pin and negative input connected to 1.245V reference. FB/SENSE (Pin 8): On the LT1173 (adjustable) this pin goes to the comparator input. On the LT1173-5 and LT1173-12, this pin goes to the internal application resis- tor that sets output voltage. PI FU C S TI Quiescent Current vs Temperature Supply Current vs Switch Current Oscillator Frequency SWITCH CURRENT (mA) 0 30 40 50 400 600 800 LT1173 •TPC07 1000 V = 5V IN 20 10 0 V = 2V IN 200 TEMPERATURE (°C) –50 100 110 120 –25 0 25 50 LT1173 •TPC06 75 100 125 V = 3V IN 90 VIN(V) 0 22.0 22.5 23.0 23.5 24.5 25.0 510 15 20 LT1173 • TPC08 24.0 25 30 25.5 26.0 |
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