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LTC1708-PG Datasheet(PDF) 4 Page - Linear Technology |
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LTC1708-PG Datasheet(HTML) 4 Page - Linear Technology |
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4 / 32 page  4 LTC1708-PG 1708f Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1708EG-PG is guaranteed to meet performance specifications from 0 °C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC1708EG-PG: TJ = TA + (PD • 85°C/W) Note 4: The LTC1708-PG is tested in a feedback loop that servos VITH1, 2 to a specified voltage and measures the resultant EAIN1, 2. Note 5: The supply current is higher due to the gate charge being delivered at the switching frequency. See Applications Information. ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted. TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Output Current and Mode (Figure 13) OUTPUT CURRENT (A) 0.1 0 20 30 40 50 60 70 1 10 15A 1708 G01 80 90 100 10 100 Burst Mode OPERATION CONSTANT FREQUENCY MODE PWM MODE VIN = 15V VOUT1 = OFF VOUT2 = 1.6V OUTPUT CURRENT (A) 0.01 40 60 100 1708 G02 20 0 0.1 1 10 100 80 30 50 15A 10 90 70 VIN = 10V VIN = 15V VIN = 5V VFCB = OPEN VOUT1 = OFF VOUT2 = 1.6V VIN = 20V EXTVCC = 0V INPUT VOLTAGE (V) 510 70 80 1708 G03 60 50 15 20 25 28 100 90 VOUT1 = OFF VOUT2 = 1.6V EXTVCC = 0V IOUT = 7A IOUT = 12A Efficiency vs Output Current (Figure 13) Efficiency vs Input Voltage (Figure 13) Note 6: The minimum on-time condition corresponds to the on inductor peak-to-peak ripple current ≥40% of IMAX (see minimum on-time considerations in the Applications Information section). Note 7: VFREQSET pin internally tied to 1.19V reference through a large resistance. Note 8: With all five VID inputs floating (or tied to VIDVCC) the VIDVCC current is typically < 1 µA. However, the VIDVCC current will rise and be approximately equal to the number of grounded VID input pins times (VIDVCC – 0.6V)/40k. (See the Applications Information section.) Note 9: Each built-in pull-up resistor attached to the VID inputs also has a series diode to allow input voltages higher than the VIDVCC supply without damage or clamping. (See Applications Information section.) Note 10: Rise and fall times are measured at 20% to 80% levels. Delay and nonoverlap times are measured using 50% levels. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VID Parameters VIDVCC VID Operating Supply Voltage 2.7 5.5 V IVIDVCC VID Supply Current VIDVCC = 3.3V (Note 8) 0.01 5 µA RFBOUT1/SENSE1 Resistance Between ATTNIN/ATTNOUT 10 5 k Ω RRATIO Resistor Ratio Accuracy Programmed from 0.925V to 2.00V –0.35 0.25 % RPULL-UP VID0 to VID4 Pull-Up Resistance (Note 9) VDIODE = 0.7V 40 k Ω VIDT VID Voltage Threshold 0.4 1.0 1.6 V IVIDLEAK VID Input Leakage Current (Note 9) VIDVCC < VIDVCC < 7V 0.1 1 µA VPULL-UP VID Pull-Up Voltage VIDVCC = 3V 2.5 2.8 3.1 V |
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