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LTC1735IGN Datasheet(PDF) 3 Page - Linear Technology |
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LTC1735IGN Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  3 LTC1735 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC1735CS, LTC1735IS: TJ = TA + (PD • 110 °C/W) LTC1735CGN, LTC1735IGN: TJ = TA + (PD • 130°C/W) 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. ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS = 5V unless otherwise noted. ISENSE Sense Pins Total Source Current VSENSE – = VSENSE+ = 0V 60 80 µA tON(MIN) Minimum On-Time Tested with a Square Wave (Note 6) 160 200 ns TG Transition Time: (Note 7) TG tr Rise Time CLOAD = 3300pF 50 90 ns TG tf Fall Time CLOAD = 3300pF 50 90 ns BG Transition Time: (Note 7) BG tr Rise Time CLOAD = 3300pF 50 90 ns BG tf Fall Time CLOAD = 3300pF 40 80 ns TG/BG t1D Top Gate Off to Synchronous CLOAD = 3300pF Each Driver 100 ns Gate On Delay Time TG/BG t2D Synchronous Gate Off to Top CLOAD = 3300pF Each Driver 70 ns Gate On Delay Time Internal VCC Regulator VINTVCC Internal VCC Voltage 6V < VIN < 30V, VEXTVCC = 4V 5.0 5.2 5.4 V VLDO(INT) Internal VCC Load Regulation ICC = 0 to 20mA, VEXTVCC = 4V 0.2 1 % VLDO(EXT) EXTVCC Drop Voltage ICC = 20mA, VEXTVCC = 5V 130 200 mV VEXTVCC EXTVCC Switchover Voltage ICC = 20mA, EXTVCC Ramping Positive q 4.5 4.7 V VEXTVCC(HYS) EXTVCC Hysteresis 0.2 V Oscillator fOSC Oscillator Frequency COSC = 43pF (Note 5) 265 300 335 kHz fH/fOSC Maximum Sync Frequency Ratio 1.3 fFCB(SYNC) FCB Pin Threshold For Sync Ramping Negative 0.9 1.2 V |
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