Datasheet LTC7815 (Analog Devices) - 5

LTC7815
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Notes 2, 4). VBIAS = 12V, VRUN1,2,3 = 5V, EXTVCC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Gate Driver
TG1,2 Pull-Up On-Resistance 2.5 Ω Pull-Down On-Resistance 1.5 Ω BG1,2 Pull-Up On-Resistance 2.4 Ω Pull-Down On-Resistance 1.1 Ω TG3 Pull-Up On-Resistance 1.2 Ω Pull-Down On-Resistance 1.0 Ω BG3 Pull-Up On-Resistance 1.2 Ω Pull-Down On-Resistance 1.0 Ω TG Transition Time: (Note 6) TG1,2,3 tr Rise Time CLOAD = 3300pF 25 ns TG1,2,3 tf Fall Time CLOAD = 3300pF 16 ns BG Transition Time: (Note 6) BG1,2,3 tr Rise Time CLOAD = 3300pF 28 ns BG1,2,3 tf Fall Time CLOAD = 3300pF 13 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver Bucks (Channels 1, 2) 25 ns Synchronous Switch-On Delay Time Boost (Channel 3) 30 ns BG/TG t1D Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver Bucks (Channels 1, 2) 20 ns Top Switch-On Delay Time Boost (Channel 3) 20 ns tON(MIN)1,2 Buck Minimum On-Time (Note 7) 45 ns tON(MIN)3 Boost Minimum On-Time (Note 7) 70 ns
INTVCC Linear Regulator
VINTVCCVBIAS Internal VCC Voltage 6V < VBIAS < 38V, VEXTVCC = 0V, IINTVCC = 0mA 5.0 5.4 5.6 V VLDOVBIAS INTVCC Load Regulation ICC = 0mA to 100mA, VEXTVCC = 0V 0.8 2.5 % VINTVCCEXT Internal VCC Voltage 6V < VEXTVCC < 13V, IINTVCC = 0mA 5.0 5.4 5.6 V VLDOEXT INTVCC Load Regulation ICC = 0mA to 100mA, VEXTVCC = 8.5V 0.8 2.5 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive 4.5 4.7 V VLDOHYS EXTVCC Hysteresis 200 mV
Oscillator and Phase-Locked Loop
f25k Programmable Frequency RFREQ = 25k; PLLIN/MODE = DC Voltage 0.25 0.32 0.37 MHz f65k Programmable Frequency RFREQ = 65k; PLLIN/MODE = DC Voltage 1.18 MHz f100k Programmable Frequency RFREQ = 100k; PLLIN/MODE = DC Voltage l 1.75 2.1 2.4 MHz fLOW Low Fixed Frequency VFREQ = 0V PLLIN/MODE = DC Voltage 0.77 0.94 1.13 MHz fHIGH High Fixed Frequency VFREQ = INTVCC; PLLIN/MODE = DC Voltage 1.2 1.44 1.75 MHz fSYNC Synchronizable Frequency PLLIN/MODE = External Clock l 0.32 2.25 MHz PLLIN VIH PLLIN/MODE Input High Level PLLIN/MODE = External Clock l 2.5 V PLLIN VIL PLLIN/MODE Input Low Level PLLIN/MODE = External Clock l 0.5 V 7815f For more information www.linear.com/LTC7815 5 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS FUNCTIONAL DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS