Datasheet LTC3892, LTC3892-1, LTC3892-2 (Analog Devices) - 5

HerstellerAnalog Devices
Beschreibung60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
Seiten / Seite38 / 5 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply …
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ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the specified operating

ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the specified operating

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LTC3892/ LTC3892-1/LTC3892-2
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VRUN1,2 = 5V, VEXTVCC = 0V, VDRVSET = 0V, VPRG1 = FLOAT unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VRUN1,2 ON RUN Pin On Threshold VRUN1, VRUN2 Rising l 1.22 1.275 1.33 V VRUN1,2 Hyst RUN Pin Hysteresis 75 mV VSENSE(MAX) Maximum Current Sense Threshold VFB1,2 = 0.7V, VSENSE1,2– = 3.3V ILIM = FLOAT (LTC3892/LTC3892-2) or LTC3892-1 l 66 75 84 mV ILIM = 0V (LTC3892/LTC3892-2) l 43 50 58 mV ILIM = INTVCC (LTC3892/LTC3892-2) l 90 100 109 mV VSENSE(MATCH) Matching Between VSENSE1(MAX) and VFB1,2 = 0.7V, VSENSE1,2– = 3.3V VSENSE2(MAX) ILIM = FLOAT (LTC3892/LTC3892-2) or LTC3892-1 l –8 0 8 mV ILIM = 0V (LTC3892/LTC3892-2) l –8 0 8 mV ILIM = INTVCC (LTC3892/LTC3892-2) l –8 0 8 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 BDSW1,2 BOOST to DRVCC Switch On- VSW = 0V, VDRVSET = INTVCC 3.7 Ω Resistance TG Transition Time: (Note 6) VDRVSET = INTVCC TG1,2 tr Rise Time CLOAD = 3300pF 25 ns TG1,2 tf Fall Time CLOAD = 3300pF 15 ns BG Transition Time: (Note 6) VDRVSET = INTVCC BG1,2 tr Rise Time CLOAD = 3300pF 25 ns BG1,2 tf Fall Time CLOAD = 3300pF 15 ns TG/BG t1D Top Gate Off to Bottom Gate On CLOAD = 3300pF Each Driver, VDRVSET = INTVCC 55 ns Delay Synchronous Switch-On Delay Time BG/TG t1D Bottom Gate Off to Top Gate On CLOAD = 3300pF Each Driver, VDRVSET = INTVCC 50 ns Delay Top Switch-On Delay Time tON(MIN)1,2 TG Minimum On-Time (Note 7) VDRVSET = INTVCC 80 ns
DRVCC Linear Regulator
VDRVCC(INT) DRVCC Voltage from Internal VIN LDO VEXTVCC = 0V 7V < VIN < 60V, DRVSET = 0V 5.8 6.0 6.2 V 11V < VIN < 60V, DRVSET = INTVCC 9.6 10.0 10.4 V VLDOREG(INT) DRVCC Load Regulation from VIN ICC = 0mA to 50mA, VEXTVCC = 0V 0.9 2.0 % LDO VDRVCC(EXT) DRVCC Voltage from Internal EXTVCC 7V < VEXTVCC < 13V, DRVSET = 0V 5.8 6.0 6.2 V LDO 11V < VEXTVCC < 13V, DRVSET = INTVCC 9.6 10.0 10.4 V VLDOREG(EXT) DRVCC Load Regulation from Internal ICC = 0mA to 50mA, VEXTVCC = 8.5V, 0.7 2.0 % EXTVCC LDO VDRVSET = 0V VEXTVCC EXTVCC LDO Switchover Voltage EXTVCC Ramping Positive DRVUV = 0V 4.5 4.7 4.9 V DRVUV = INTVCC 7.4 7.7 8.0 V VLDOHYS EXTVCC Hysteresis 250 mV VDRVCC(50kΩ) Programmable DRVCC RDRVSET = 50kΩ, VEXTVCC = 0V 5.0 V VDRVCC(70kΩ) Programmable DRVCC RDRVSET = 70kΩ, VEXTVCC = 0V 6.4 7.0 7.6 V VDRVCC(90kΩ) Programmable DRVCC RDRVSET = 90kΩ, VEXTVCC = 0V 9.0 V 38921fc For more information www.linear.com/LTC3892 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Functional Diagrams Operation Package Description Typical Application Related Parts