Datasheet LTC3728L, LTC3728LX (Analog Devices) - 5

LTC3728L/LTC3728LX
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS INTVCC Linear Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 30V, VEXTVCC = 4V 4.8 5.0 5.2 V VLDO INT INTVCC Load Regulation ICC = 0 to 20mA, VEXTVCC = 4V 0.2 2.0 % VLDO EXT EXTVCC Voltage Drop ICC = 20mA, VEXTVCC = 5V 100 200 mV VEXTVCC EXTVCC Switchover Voltage ICC = 20mA, EXTVCC Ramping Positive ● 4.5 4.7 V VLDOHYS EXTVCC Hysteresis 0.2 V
Oscillator and Phase-Locked Loop
fNOM Nominal Frequency VPLLFLTR = 1.2V 360 400 440 kHz fLOW Lowest Frequency VPLLFLTR = 0V 230 260 290 kHz fHIGH Highest Frequency VPLLFLTR ≥ 2.4V 480 550 590 kHz RPLLIN PLLIN Input Resistance 50 kΩ IPLLFLTR Phase Detector Output Current Sinking Capability fPLLIN < fOSC –15 µA Sourcing Capability fPLLIN > fOSC 15 µA
3.3V Linear Regulator
V3.3OUT 3.3V Regulator Output Voltage No Load ● 3.2 3.35 3.45 V V3.3IL 3.3V Regulator Load Regulation I3.3 = 0 to 10mA 0.5 2 % V3.3VL 3.3V Regulator Line Regulation 6V < VIN < 30V 0.05 0.2 %
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, Either Controller VOSENSE with Respect to Set Output Voltage VOSENSE Ramping Negative –6 –7.5 –9.5 % VOSENSE Ramping Positive 6 7.5 9.5 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 5:
Rise and fall times are measured using 10% and 90% levels. Delay may cause permanent damage to the device. Exposure to any Absolute times are measured using 50% levels. Maximum Rating condition for extended periods may affect device
Note 6:
The minimum on-time is tested under an ideal condition without reliability and lifetime. external power FETs. It can be larger when the IC is operating in an
Note 2:
TJ is calculated from the ambient temperature TA and power actual circuit. See Minimum On-Time Considerations in the Applications dissipation PD according to the following formulas: Information section. LTC3728LUH/LTC3728LXUH: TJ = TA + (PD • 34°C/W)
Note 7:
The LTC3728LC/LTC3728LXC are guaranteed to meet performance LTC3728LGN: T specifications from 0°C to 85°C. The LTC3728LE is guaranteed to meet J = TA + (PD • 95°C/W)
Note 3:
The IC is tested in a feedback loop that servos V performance specifications over the –40°C to 85°C operating temperature ITH1, 2 to a specified voltage and measures the resultant V range as assured by design, characterization and correlation with statistical OSENSE1, 2. process controls. The LTC3728LI is guaranteed to meet performance
Note 4:
Dynamic supply current is higher due to the gate charge being specifications over the –40°C to 85°C operating temperature range. delivered at the switching frequency. See the Applications Information section.
Note 8:
Guaranteed by design. 3728lxff 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts