Datasheet LTC3789 (Analog Devices) - 4

LTC3789
e lecTrical 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 = 15V, VRUN = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS INTVCC Linear Regulator
VINTVCCVIN Internal VCC Voltage 6.5V < VIN < 40V, VEXTVCC = 0V 5.2 5.5 5.8 V VLDOVIN INTVCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 0V 0.2 1.0 % VINTVCCEXT Internal VCC Voltage 6.5V < VEXTVCC < 14V 5.2 5.5 5.8 V VLDOEXT INTVCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 12V 0.2 1.0 % VEXTVCC EXTVCC Switchover Voltage ICC = 0mA to 20mA, EXTVCC Ramping Positive 4.7 4.8 V VLDOHYS EXTVCC Hysteresis 0.25 V
Oscillator and Phase-Locked Loop
fNOM Nominal Frequency VFREQ = 1.2V 350 400 440 kHz fLOW Low Fixed Frequency VFREQ = 0V 175 200 225 kHz fHIGH High Fixed Frequency VFREQ = 2.4V 570 640 710 kHz fSYNC Synchronizable Frequency MODE/PLLIN = External Clock l 200 600 kHz RMODE/PLLIN MODE/PLLIN Input Resistance 220 kΩ IFREQ Frequency Setting Current 8 10 12 µA
PGOOD Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 µA VPG PGOOD Trip Level VFB with Respect to Set Output Voltage VFB Ramping Negative –10 % VFB Ramping Positive 10 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
TJ is calculated from the ambient temperature TA and power may cause permanent damage to the device. Exposure to any Absolute dissipation PD according to the following formula: Maximum Rating condition for extended periods may affect device LTC3789GN: TJ = TA + (PD • 80°C/W) reliability and lifetime. LTC3789UFD: TJ = TA + (PD • 34°C/W)
Note 2:
The LTC3789 is tested under pulse load conditions such that
Note 4:
The LTC3789 is tested in a feedback loop that servos V T ITH to a J ≈ TA. The LTC3789E is guaranteed to meet performance specifications specified voltage and measures the resultant V from 0°C to 85°C operating junction temperature. Specifications over FB. the –40°C to 125°C operating junction temperature range are assured by
Note 5:
Dynamic supply current is higher due to the gate charge being design, characterization and correlation with statistical process controls. delivered at the switching frequency. See the Applications Information The LTC3789I is guaranteed to meet performance specifications over the section. full –40°C to 125°C operating junction temperature range.
Note 6:
Do not apply a voltage or current to these pins. They must be connected to capacitive loads only, otherwise permanent damage may occur. 3789fc 4 For more information www.linear.com/LTC3789 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts