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LT1173 Datasheet(PDF) 3 Page - Linear Technology |
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LT1173 Datasheet(HTML) 3 Page - Linear Technology |
3 / 16 page LT1173 3 VSAT SWSAT Voltage, Step-Down Mode VIN = 12V, ISW = 650mA 1.1 1.5 V q 1.7 V AV Gain Block Gain RL = 100kΩ (Note 3) q 400 1000 V/V Current Limit 220 Ω to ILIM to VIN 400 mA Current Limit Temperature Coeff. q – 0.3 %/ °C Switch OFF Leakage Current Measured at SW1 Pin 1 10 µA VSW2 Maximum Excursion Below GND ISW1 ≤ 10µA, Switch Off – 400 – 350 mV SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Note 2: The output voltage waveform will exhibit a sawtooth shape due to the comparator hysteresis. The output voltage on the fixed output versions will always be within the specified range. Note 3: 100k Ω resistor connected between a 5V source and the AO pin. The q denotes the specifications which apply over the full operating temperature range. Note 1: This specification guarantees that both the high and low trip points of the comparator fall within the 1.20V to 1.30V range. ELECTRICAL C C HARA TERISTICS T A = 25°C, VIN = 3V, unless otherwise noted. Maximum Switch Current vs Set Pin Bias Current vs Feedback Pin Bias Current vs RLIM Step-Down Mode Temperature Temperature CC HARA TERISTICS A TYPICALPERFOR CE I (A) 0 0 0.2 0.4 0.6 1.0 1.2 0.2 0.4 0.6 0.8 LT1173 • TPC01 0.8 1.0 1.2 SWITCH V = 5.0V IN V = 3.0V IN V = 2.0V IN I (A) 0 0.7 0.8 0.9 1.1 1.3 1.4 0.1 0.2 0.3 0.4 LT1173 • TPC02 1.2 0.5 0.6 SWITCH 0.7 0.8 1.0 Switch ON Voltage Saturation Voltage Step-Up Mode Step-Down Mode Maximum Switch Current vs (SW2 Pin Grounded) (SW1 Pin Connected to VIN)RLIM Step-Up Mode TEMPERATURE (°C) –50 10 15 20 –25 0 25 50 LT1173 •TPC04 75 100 125 V = 3V IN 5 TEMPERATURE (°C) –50 14 16 18 –25 0 25 50 LT1173 •TPC05 75 100 125 V = 3V IN 12 10 8 R ( ) 100 0 400 800 1000 LT1173 • TPC09 Ω 900 700 600 500 300 200 LIM 1000 VOUT = 5V 100 VIN = 24V L = 500 µH VIN = 12V L = 250 µH R ( ) 10 100 400 800 1200 100 LT1173 • TPC03 Ω 1000 900 700 600 500 300 200 LIM 1000 1100 2V ≤ V IN ≤ 5V |
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