Datasheet LTC7800 (Analog Devices) - 4

LTC7800
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, VRUN = 5V, EXTVCC = 0V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
tON(MIN) Minimum TG On-Time (Note 7) 45 ns
INTVCC Linear Regulator
VINTVCCVIN Internal VCC Voltage 6V < VIN < 60V, VEXTVCC = 0V 4.85 5.1 5.35 V VLDOVIN INTVCC Load Regulation ICC = 0mA to 50mA, VEXTVCC = 0V 0.7 1.1 % VINTVCCEXT Internal VCC Voltage 6V < VEXTVCC < 13V 4.85 5.1 5.35 V VLDOEXT INTVCC Load Regulation ICC = 0mA to 50mA, 0.6 1.1 % VEXTVCC = 8.5V VEXTVCC EXTVCC Switchover Voltage ICC = 0mA to 50mA, 4.5 4.7 4.9 V EXTVCC Ramping Positive VLDOHYS EXTVCC Hysteresis 250 mV
Oscillator and Phase-Locked Loop
f25kΩ Programmable Frequency RFREQ = 25k; 0.27 0.32 0.36 MHz PLLIN/MODE = DC Voltage f65kΩ Programmable Frequency RFREQ = 65k; 1.18 MHz PLLIN/MODE = DC Voltage f100kΩ Programmable Frequency RFREQ =100k; l 1.75 2.1 2.4 MHz PLLIN/MODE = DC Voltage fLOW Low Fixed Frequency VFREQ = 0V; 0.79 0.94 1.08 MHz PLLIN/MODE = DC Voltage fHIGH High Fixed Frequency VFREQ = INTVCC; 1.2 1.44 1.7 MHz PLLIN/MODE = DC Voltage 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
PGOOD1 Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.2 0.4 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 µA VPG PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Negative –13 –10 –7 % Hysteresis 2.5 % VFB Ramping Positive 7 10 13 % Hysteresis 2.5 % tPG Delay for Reporting a Fault 25 µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings temperature range. High junction temperatures degrade operating may cause permanent damage to the device. Exposure to any Absolute lifetimes; operating lifetime is derated for junction temperatures greater Maximum Rating condition for extended periods may affect device than 125°C. Note that the maximum ambient temperature consistent with reliability and lifetime. these specifications is determined by specific operating conditions in
Note 2:
The LTC7800 is tested under pulsed load conditions such that conjunction with board layout, the rated package thermal impedance and TJ ≈ TA. The LTC7800E is guaranteed to meet performance specifications other environmental factors. from 0°C to 85°C. Specifications over the –40°C to 125°C operating
Note 3:
The junction temperature (TJ, in °C) is calculated from the ambient junction temperature range are assured by design, characterization and temperature (TA, in °C) and power dissipation (PD, in Watts) according to correlation with statistical process controls. The LTC7800I is guaranteed the formula: over the –40°C to 125°C operating junction temperature range, the TJ = TA + (PD • θJA), where θJA is 52°C/W. LTC7800H is guaranteed over the –40°C to 150°C operating junction 7800f 4 For more information www.linear.com/LTC7800 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions FUNCTIONAL Diagram Operation Applications Information Typical Application Related Parts