Datasheet LTC3869, LTC3869-2 (Analog Devices) - 4

LTC3869/LTC3869-2
e lecTrical characTerisTics The
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denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN1,2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS INTVCC Linear Regulator
VINTVCC Internal VCC Voltage 6V < VIN < 38V 4.8 5 5.2 V VLDO INT INTVCC Load Regulation ICC = 0mA to 20mA 0.5 2 % VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive l 4.5 4.7 V VLDOHYS EXTVCC Hysteresis 200 mV VLDO EXT EXTVCC Voltage Drop ICC = 20mA, VEXTVCC = 5V 50 100 mV
PGOOD Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±2 µA VPG PGOOD Trip Level VFB with Respect to Set Output Voltage VFB Ramping Negative –10 % VFB Ramping Positive 10 %
Oscillator and Phase-Locked Loop
fNOM Nominal Frequency VFREQ = 1.2V 450 500 550 kHz fLOW Lowest Frequency VFREQ = 0V 210 250 290 kHz fHIGH Highest Frequency VFREQ ≥ 2.4V 700 780 850 kHz RMODE/PLLIN MODE/PLLIN Input Resistance 250 kΩ IFREQ Frequency Setting Current 9 10 11 µA
On Chip Driver
TG RUP TG Pull-Up RDS(ON) TG High 2.6 Ω TG RDOWN TG Pull-Down RDS(ON) TG Low 1.5 Ω BG RUP BG Pull-Up RDS(ON) BG High 2.4 Ω BG RDOWN BG Pull-Down RDS(ON) BG Low 1.1 Ω
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 formulas: Maximum Rating condition for extended periods may affect device LTC3869UFD: TJ = TA + (PD • 34°C/W) reliability and lifetime. LTC3869GN-2: TJ = TA + (PD • 80°C/W)
Note 2:
The LTC3869 is tested under pulsed load conditions such that LTC3869UFD: TJ = TA + (PD • 37°C/W) TJ ≈ TA. The LTC3869E is guaranteed to meet performance specifications
Note 4:
The LTC3869 is tested in a feedback loop that servos V from 0°C to 85°C. Specifications over the –40°C to 125°C operating ITH1,2 to a specified voltage and measures the resultant VFB1,2. junction temperature range are assured by design, characterization
Note 5:
Dynamic supply current is higher due to the gate charge being and correlation with statistical process controls. The LTC3869I is delivered at the switching frequency. See Applications Information. guaranteed to meet performance specifications over the full –40°C to
Note 6:
Delay times are measured using 50% levels. 125°C operating junction temperature range. The maximum ambient temperature consistent with these specifications is determined by specific
Note 7:
The minimum on-time condition is specified for an inductor peak-to-peak ripple current ≥40% of I operating conditions in conjunction with board layout, the package thermal MAX (see Minimum On-Time Considerations in the Applications Information section). impedance and other environmental factors.
Note 8:
Guaranteed by design. 38692fb 4 For more information www.linear.com/LTC3869 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts