Datasheet LTC7813 (Analog Devices) - 4

LTC7813
e lecTrical characTerisTics The
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denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VBIAS = 12V, VRUN1,2 = 5V, VEXTVCC = 0V, VDRVSET = 0V, VPRG2 = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Maximum Duty Factor for TG Buck (Channel 1) in Dropout, FREQ = 0V 97.5 99 % Boost (Channel 2) 100 % Maximum Duty Factor for BG Buck (Channel 1) in Overvoltage 100 % Boost (Channel 2) 96 % ITRACK/SS1 Soft-Start Charge Current VTRACK/SS1 = 0V 8 10 12 µA ISS2 Soft-Start Charge Current VSS2 = 0V 8 10 12 µA VRUN1,2 ON RUN Pin On Threshold VRUN1, VRUN2 Rising l 1.22 1.275 1.33 V RUN Pin Hysteresis 75 mV VSENSE1,2(MAX) Maximum Current Sense Threshold ILIM = Float l 65 75 85 mV ILIM = 0V l 43 50 58 mV ILIM = INTVCC l 90 100 109 mV
Gate Driver
TG1,2 Pull-Up On-Resistance VDRVSET = INTVCC 2.2 Ω Pull-Down On-Resistance 1.0 Ω BG1,2 Pull-Up On-Resistance VDRVSET = INTVCC 2.2 Ω Pull-Down On-Resistance 1.0 Ω BOOST1,2 to DRVCC Switch On-Resistance VSW1,2 = 0V, VDRVSET = INTVCC 3.7 Ω TG Transition Time: (Note 6) VDRVSET = INTVCC Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 15 ns BG Transition Time: (Note 6) VDRVSET = INTVCC Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 15 ns Top Gate Off to Bottom Gate On Delay CLOAD = 3300pF Each Driver, VDRVSET = INTVCC Synchronous Switch-On Delay Time Buck (Channel 1) 55 ns Boost (Channel 2) 85 ns Bottom Gate Off to Top Gate On Delay CLOAD = 3300pF Each Driver, VDRVSET = INTVCC Top Switch-On Delay Time Buck (Channel 1) 50 ns Boost (Channel 2) 80 ns tON(MIN)1 Buck Minimum On-Time (Note 7) VDRVSET = INTVCC 80 ns tON(MIN)2 Boost Minimum On-Time (Note 7) VDRVSET = INTVCC 120 ns
DRVCC Linear Regulator
DRVCC Voltage from Internal VBIAS LDO VEXTVCC = 0V 7V < VBIAS < 60V, DRVSET = 0V 5.8 6.0 6.2 V 11V < VBIAS < 60V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from VBIAS LDO ICC = 0mA to 50mA, VEXTVCC = 0V 0.9 2.0 % DRVCC Voltage from Internal EXTVCC LDO 7V < VEXTVCC < 13V, DRVSET = 0V 5.8 6.0 6.2 V 11V < VEXTVCC < 13V, DRVSET = INTVCC 9.6 10.0 10.4 V DRVCC Load Regulation from Internal ICC = 0mA to 50mA, VEXTVCC = 8.5V, 0.7 2.0 % EXTVCC LDO VDRVSET = 0V EXTVCC LDO Switchover Voltage EXTVCC Ramping Positive DRVSET = 0V or RDRVSET ≤ 100kΩ 4.5 4.7 4.9 V DRVSET = INTVCC 7.4 7.7 8.0 V EXTVCC Hysteresis 250 mV Programmable DRVCC RDRVSET = 50kΩ, VEXTVCC = 0V 5.0 V Programmable DRVCC RDRVSET = 70kΩ, VEXTVCC = 0V 6.4 7.0 7.6 V Programmable DRVCC RDRVSET = 90kΩ, VEXTVCC = 0V 9.0 V 7813f 4 For more information www.linear.com/LTC7813 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagrams Operation Applications Information Typical Applications Package Description Typical Application Related Parts