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LTC3376 Datasheet(PDF) 3 Page - Analog Devices |
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LTC3376 Datasheet(HTML) 3 Page - Analog Devices |
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3 / 28 page  LTC3376 3 Rev 0 For more information www.analog.com ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Total System Current Bootstrapped 1 Buck on, Sleeping, VFB+ = 0.41V (Note 4) 2 Bucks on, Sleeping, VFB+ = 0.41V (Note 4) All Bucks on (Note 4) 27 32 42 µA µA µA EXTVCC Input Supply Current, EXTVCC = 3.3V 1 Buck on, Sleep, VFB+ = 0.41V Each Additional Buck, Sleep 1 Buck on (Configured to 1 Power Stage), SYNC/MODE = INTVCC (Note 3) 56 17 4.5 85 30 µA µA mA Undervoltage Threshold on INTVCC INTVCC Voltage Falling l 2.55 2.6 2.65 V Undervoltage Hysteresis on INTVCC 250 mV fosc Internal Oscillator Frequency RT = INTVCC, SYNC/MODE = 0V RT = 402k, SYNC/MODE = 0V l l 1.84 1.84 2 2 2.16 2.16 MHz MHz Synchronization Frequency l 1 3 MHz External Low Voltage Supply (If Used) EXTVCC Optional External Supply Range l 3 5.5 V Undervoltage Threshold on EXTVCC EXTVCC Voltage Falling l 2.8 2.85 2.95 V Undervoltage Hysteresis on EXTVCC 75 mV 1.5A Buck Regulators VIN Buck Input Voltage Range l 3 20 V Undervoltage Threshold on VIN VIN Voltage Falling Hysteresis l 2.5 2.6 0.2 2.7 V V VINA-H Input Supply Current, VINA-H = 12V All Bucks Off VINB, VINC, VINF, VING VINA, VIND, VINE, VINH 0.7 0 1.4 µA µA Buck On, Sleeping, VFB+ = 0.41V VINB, VINC, VINF, VING VINA, VIND, VINE, VINH 0.7 0 1.4 µA µA Buck On, SYNC/MODE=INTVCC 5.2 mA Top Switch Current Limit, Duty < 18% (Note 5) 2.3 2.62 3.0 A VFB+ Feedback Regulation Voltage l 396 400 404 mV IFB+ Feedback Leakage Current VFB+ = 0.41V –30 30 nA Minimum Off-Time 90 140 ns Minimum On-Time l 53 85 ns Top Switch Power FET On-Resistance 170 mΩ Bottom Switch Power FET On-Resistance 90 mΩ Top Switch Power FET Leakage VINA-H = 20V, SWA-H = 0V 0.1 µA Bottom Switch Power FET Leakage VINA-H = SWA-H = 20V 0.003 1 µA SW Pull-Down Resistance in Shutdown RUN1-4 = 0V per Output Channel 1 kΩ tSS Soft-Start Time (Note 6) l 0.3 1 2.5 ms Start-Up Delay Time Starting Up from All EN’s Low When at Least One EN Is Already High 100 40 250 100 500 250 µs µs PGOOD Lower Threshold VFB+ Falling, Percentage of Regulated VFB+ l 95 96.75 98.5 % PGOOD Lower Threshold Hysteresis 1 % PGOOD Upper Threshold VFB+ Rising, Percentage of Regulated VFB+ l 104.5 107.5 110.5 % PGOOD Upper Threshold Hysteresis 2.5 % PGOOD Filtering Time 100 µs The l denotes the specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25°C (Note 2). VCC = VINA-H = 12V, RT tied to INTVCC, VFB1-4¯ = 0V, unless otherwise stated. |
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