Datasheet LTC7103 (Analog Devices) - 4

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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 unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
OVLO Pin Hysteresis 65 mV OVLO Pin Leakage Current OVLO = 1.5V –10 0 10 nA
Bias Regulators and Housekeeping
INTVCC Undervoltage Lockout INTVCC Rising 3.00 V INTVCC Falling 2.80 V VEXTVCC EXTVCC Switchover Voltage EXTVCC Rising l 3.04 3.10 3.17 V EXTVCC Falling l 2.95 3.00 3.07 V Regulated INTVCC Voltage from VIN 3.37 3.5 3.6 V Regulated INTVCC Voltage from EXTVCC 3.37 3.5 3.6 V
Oscillator and Phase-Locked Loop
Programmable Frequency Accuracy RFREQ = 12.5k (200kHz) to 57.5k (2MHz) l –15 15 % PLLIN/MODE = 0V fLOW Low Preset Frequency VFREQ = 0V; l 270 300 330 kHz PLLIN/MODE = 0V fHIGH High Preset Frequency VFREQ = INTVCC; l 0.9 1.0 1.1 MHz PLLIN/MODE = 0V Synchronizable Frequency PLLIN/MODE = External Clock l 200 2000 kHz PLLIN/MODE Input High Level for Clocking PLLIN/MODE = External Clock l 2.0 V PLLIN/MODE Input Low Level for Clocking PLLIN/MODE = External Clock l 0.8 V
PGOOD Output
PGOOD Voltage Low IPGOOD = 1mA 0.3 0.5 V PGOOD Leakage Current VPGOOD = 12V –1 1 µA PGOOD Trip Level VFB with Respect to Set Regulated Voltage VFB Ramping Positive 7 10 13 % Hysteresis 2.5 % VFB Ramping Negative –13 –10 –7 % Hysteresis 2.5 % TPG Delay for Reporting a Fault 24 µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
This IC includes overtemperature protection that is intended to may cause permanent damage to the device. Exposure to any Absolute protect the device during momentary overload conditions. The maximum Maximum Rating condition for extended periods may affect device rated junction temperature will be exceeded when this protection is active. reliability and lifetime. Continuous operation above the specified absolute maximum operating
Note 2:
The LTC7103E is guaranteed to meet specifications from 0°C junction temperature may impair device reliability or permanently damage to 85°C with specifications over the –40°C to 125°C operating junction the device. The overtemperature protection level is not production tested. temperature range assured by design, characterization and correlation with
Note 5:
The LTC7103 is tested in a feedback loop that servos VFB to statistical process controls. The LTC7103I is guaranteed over the –40°C to a voltage near the internal reference voltage to obtain the specified 125°C operating junction temperature range, the LTC7103H is guaranteed ITH voltage. over the –40°C to 150°C operating junction temperature range, and the
Note 6:
The Average Output Current Limit, the Top Switch Peak Current LTC7103MP is tested and guaranteed over the –55°C to 150°C operating Limit and the Current Monitor Output Voltage are measured in a test circuit junction temperature range. High junction temperatures degrade operating lifetimes; operating lifetime is derated for junction temperatures greater that simulates operation in a typical application. than 125°C. Note that the maximum ambient temperature consistent with
Note 7:
The minimum controllable on-time is measured in a test these specifications is determined by specific operating conditions in mode. (See Minimum ON-Time Considerations in the Applications conjunction with board layout, the rated package thermal impedance and Information section.) other environmental factors.
Note 8:
Dynamic supply current is higher due to the internal gate charge
Note 3:
TJ is calculated from the ambient temperature TA and power being delivered at the switching frequency. dissipation PD according to the following formula:
Note 9:
See Operating at VOUT > 6V in the Applications Information section TJ
=
TA
+ (
PD
•
qJA
°
C
/
W
)
for details about additional design constraints that may apply. Rev. B 4 For more information www.analog.com 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 Package Description Revision History Typical Application Related Parts