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LTC1929-PG Datasheet(PDF) 4 Page - Linear Technology |
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LTC1929-PG Datasheet(HTML) 4 Page - Linear Technology |
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4 / 32 page  4 LTC1735 1735fc TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Load Current (3 Operating Modes) Efficiency vs Load Current Efficiency vs Input Voltage LOAD CURRENT (A) 0.001 60 70 80 BURST SYNC 10 1735 G01 50 40 20 0.01 0.1 1 30 100 90 VIN = 10V VOUT = 3.3V RS = 0.01Ω fO = 300kHz EXTVCC OPEN CONTINUOUS LOAD CURRENT (A) 0.01 0.1 1 10 1735 G02 100 90 80 70 60 50 40 VIN = 5V EXTVCC = 5V FIGURE 1 VIN = 24V VIN = 15V INPUT VOLTAGE (V) 0 70 75 80 85 90 100 5 10 15 20 1735 G03 25 30 95 EXTVCC = 5V VOUT = 1.6V FIGURE 1 IOUT = 5A IOUT = 0.5A Efficiency vs Input Voltage Load Regulation VIN – VOUT Dropout Voltage vs Load Current INPUT VOLTAGE (V) 0 70 75 80 85 90 100 5 10 15 20 1735 G04 25 30 95 EXTVCC OPEN VOUT = 1.6V FIGURE 1 IOUT = 5A IOUT = 0.5A LOAD CURRENT (A) 0 –0.2 –0.1 8 1735 G05 –0.3 –0.4 2 4 6 10 0 FCB = 0V VIN = 15V FIGURE 1 LOAD CURRENT (A) 0 0 500 400 300 200 100 2468 1735 G06 10 RSENSE = 0.005Ω VOUT = 5V – 5% DROP Note 3: The LTC1735 is tested in a feedback loop that servos VOSENSE to the balance point for the error amplifier (VITH = 1.2V). Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. See Applications Information. Note 5: Oscillator frequency is tested by measuring the COSC charge current (IOSC) and applying the formula: f CpF I I OSC OSC CHG DIS = + + 8 477 10 11 11 11 1 .( ) () – Note 6: The minimum on-time condition corresponds to an inductor peak- to-peak ripple current ≥40% of IMAX (see Minimum On-Time Considerations in the Applications Information section). Note 7: Rise and fall times are measured using 10% and 90% levels. Delay times are measured using 50% levels. Note 8: The LTC1735E is guaranteed to meet performance specifications from 0 °C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTC1735I specifications are guaranteed over the full –40 °C to 85°C operating temperature range. ELECTRICAL CHARACTERISTICS |
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