Datasheet LTC7817 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Synchronous Controller |
| Pages / Page | 44 / 5 — ELECTRICAL CHARACTERISTICS. The. indicates specifications which apply … |
| File Format / Size | PDF / 3.0 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. indicates specifications which apply over the specified operating
Model Line for this Datasheet
Text Version of Document
LTC7817
ELECTRICAL CHARACTERISTICS The
l
indicates specifications which apply over the specified operating junction temperature range, otherwise specifications are for TA = 25°C, VBIAS = 12V, RUN1,2,3 > 1.25V, EXTVCC = 0V, VPRG3 = FLOAT unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS INTVCC Low Dropout (LDO) Linear Regulator
INTVCC Regulation Point 4.9 5.1 5.3 V INTVCC Load Regulation ICC = 0mA to 100mA, VBIAS ≥ 6V 1.2 2 % ICC = 0mA to 100mA, VEXTVCC ≥ 6V 1.2 2 % EXTVCC LDO Switchover Voltage EXTVCC Rising 4.5 4.7 4.8 V EXTVCC Switchover Hysteresis 250 mV UVLO Undervoltage Lockout INTVCC Rising l 4.10 4.20 4.35 V INTVCC Falling l 3.75 3.90 4.00 V
Oscillator and Phase-Locked Loop
fOSC Low Fixed Frequency VFREQ = 0V, PLLIN/MODE = DC Voltage 330 380 430 kHz High Fixed Frequency VFREQ = INTVCC, PLLIN/MODE = DC Voltage l 2.0 2.25 2.5 MHz Programmable Frequency RFREQ = 374kΩ, PLLIN/MODE = DC Voltage 100 kHz RFREQ = 75kΩ, PLLIN/MODE = DC Voltage 450 500 550 kHz RFREQ = 12kΩ, PLLIN/MODE = DC Voltage 3 MHz Synchronizable Frequency Range PLLIN/MODE = External Clock l 0.1 3 MHz PLLIN Input High Level l 2.2 V PLLIN Input Low Level l 0.5 V
PGOOD1 Output
PGOOD1 Voltage Low IPGOOD1 = 2mA 0.2 0.4 V PGOOD1 Leakage Current VPGOOD1 = 5V ±1 µA PGOOD1 Trip Level VFB1 Rising 7 10 13 % VFB1 Relative to Set Regulation Point Hysteresis 2.5 % VFB1 Falling –13 –10 –7 % Hysteresis 2.5 % PGOOD1 Delay for Reporting a Fault 25 µs Rev 0 For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
indicates specifications which apply over the specified operating junction temperature range, otherwise specifications are for TA = 25°C, VBIAS = 12V, RUN1,2,3 > 1.25V, EXTVCC = 0V, VPRG3 = FLOAT unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS INTVCC Low Dropout (LDO) Linear Regulator
INTVCC Regulation Point 4.9 5.1 5.3 V INTVCC Load Regulation ICC = 0mA to 100mA, VBIAS ≥ 6V 1.2 2 % ICC = 0mA to 100mA, VEXTVCC ≥ 6V 1.2 2 % EXTVCC LDO Switchover Voltage EXTVCC Rising 4.5 4.7 4.8 V EXTVCC Switchover Hysteresis 250 mV UVLO Undervoltage Lockout INTVCC Rising l 4.10 4.20 4.35 V INTVCC Falling l 3.75 3.90 4.00 V
Oscillator and Phase-Locked Loop
fOSC Low Fixed Frequency VFREQ = 0V, PLLIN/MODE = DC Voltage 330 380 430 kHz High Fixed Frequency VFREQ = INTVCC, PLLIN/MODE = DC Voltage l 2.0 2.25 2.5 MHz Programmable Frequency RFREQ = 374kΩ, PLLIN/MODE = DC Voltage 100 kHz RFREQ = 75kΩ, PLLIN/MODE = DC Voltage 450 500 550 kHz RFREQ = 12kΩ, PLLIN/MODE = DC Voltage 3 MHz Synchronizable Frequency Range PLLIN/MODE = External Clock l 0.1 3 MHz PLLIN Input High Level l 2.2 V PLLIN Input Low Level l 0.5 V
PGOOD1 Output
PGOOD1 Voltage Low IPGOOD1 = 2mA 0.2 0.4 V PGOOD1 Leakage Current VPGOOD1 = 5V ±1 µA PGOOD1 Trip Level VFB1 Rising 7 10 13 % VFB1 Relative to Set Regulation Point Hysteresis 2.5 % VFB1 Falling –13 –10 –7 % Hysteresis 2.5 % PGOOD1 Delay for Reporting a Fault 25 µs Rev 0 For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Typical Application Related Parts
