Datasheet LTC3376 (Analog Devices) - 3

LTC3376
ELECTRICAL CHARACTERISTICS 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. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Total System Current Bootstrapped 1 Buck on, Sleeping, V + FB = 0.41V (Note 4) 27 µA 2 Bucks on, Sleeping, V + FB = 0.41V (Note 4) 32 µA All Bucks on (Note 4) 42 µA EXTV + CC Input Supply Current, EXTVCC = 3.3V 1 Buck on, Sleep, VFB = 0.41V 56 85 µA Each Additional Buck, Sleep 17 30 µA 1 Buck on (Configured to 1 Power Stage), 4.5 mA SYNC/MODE = INTVCC (Note 3) 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 l 1.84 2 2.16 MHz RT = 402k, SYNC/MODE = 0V l 1.84 2 2.16 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 l 2.5 2.6 2.7 V Hysteresis 0.2 V VINA-H Input Supply Current, VINA-H = 12V All Bucks Off VINB, VINC, VINF, VING 0.7 1.4 µA VINA, VIND, VINE, VINH 0 µA Buck On, Sleeping, V + FB = 0.41V VINB, VINC, VINF, VING 0.7 1.4 µA VINA, VIND, VINE, VINH 0 µA Buck On, SYNC/MODE=INTVCC 5.2 mA Top Switch Current Limit, Duty < 18% (Note 5) 2.3 2.62 3.0 A V + FB Feedback Regulation Voltage l 396 400 404 mV I + + FB 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 100 250 500 µs When at Least One EN Is Already High 40 100 250 µs PGOOD Lower Threshold V + + FB Falling, Percentage of Regulated VFB l 95 96.75 98.5 % PGOOD Lower Threshold Hysteresis 1 % PGOOD Upper Threshold V + + FB Rising, Percentage of Regulated VFB l 104.5 107.5 110.5 % PGOOD Upper Threshold Hysteresis 2.5 % PGOOD Filtering Time 100 µs Rev 0 For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts