Datasheet LTC7151S (Analog Devices) - 3

LTC7151S
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
ILIM Positive Inductor Valley Current Limit FB = 0.58V l 16 18 20 A ILIM-ITH Current Threshold at Different ITH Voltage ITH = 1.4V l 7 9 11 A ITH = 1V l –2 0 2 A ITH = 0.6V l –11 –9 –7 A ITH = 0.2V l –20 –18 –16 A RTOP Top Power NMOS On-Resistance INTVCC = 3.3V 11 mΩ RBOT Bottom Power NMOS On-Resistance INTVCC = 3.3V 4 mΩ ISW Top Switch Leakage VIN = 20V, VSW = 0V 0.1 1 µA (Note 5) Bottom Switch Leakage VIN = 20V, VSW = 20V 100 150 µA VUVLO INTVCC Undervoltage Lockout Threshold INTVCC Falling 2.45 2.6 2.75 V INTVCC Hysteresis (Rising) 250 mV VRUN RUN Rising 1.15 1.20 1.25 V RUN Falling Hysteresis 100 mV IRUN Run Leakage Current 100 nA VINTVCC Internal VCC Voltage 3.2 3.3 3.4 V OV Output Overvoltage VFB Rising 6 8 10 % PGOOD Upper Threshold VFB Falling Hysteresis 10 mV UV Output Undervoltage VFB Falling –10 –8 –6 % PGOOD Lower Threshold VFB Rising Hysteresis 10 mV RPGOOD PGOOD Pull-Down Resistance VPGOOD = 100mV 8 15 Ω IPGOOD PGOOD Leakage VFB = 0.6V 2 µA tPGOOD PGOOD Delay PGOOD Low to High 6 cycles PGOOD High to Low 25 cycles ITRACK/SS Track Pull-Up Current VTRACK/SS = 0V 6 10 µA fOSC Oscillator Frequency RT = 162kΩ l 0.9 1 1.1 MHz fSYNC SYNC Capture Range % of Programmed Frequency 70 130 % MODE/SYNC MODE/SYNC Threshold Input High 1 V MODE/SYNC Threshold Input Low 0.3 V IMODE/SYNC MODE/SYNC Current MODE/SYNC = 0V 6 14 µA VCLKOUT Clock Output High Voltage VINTVCC – 0.2 VINTVCC Clock Output Low Voltage 0 0.2 PHMODE PHMODE Threshold 180° (2-Phase) VINTVCC – 0.1 V 90° (4-Phase) 1.0 VINTVCC – 1 V 120° (3-Phase) 0.1 V VINOV VIN Overvoltage Threshold VIN Rising 24.5 V VIN Falling 21.5 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings operating conditions in conjunction with board layout, the rated package may cause permanent damage to the device. Exposure to any Absolute thermal impedance and other environmental factors. The junction Maximum Rating condition for extended periods may affect device temperature (TJ, in °C) is calculated from the ambient temperature (TA, in reliability and lifetime. °C) and power dissipation (PD, in Watts) according to the formula:
Note 2:
The LTC7151S is tested under pulsed load conditions such TJ = TA + (PD • θJA), that TJ ≈ TA. The LTC7151SE is guaranteed to meet specifications from where θJA (in °C/W) is the package thermal impedance. 0°C to 85°C junction temperature. Specifications over the –40°C to
Note 3:
The quiescent current in forced continuous mode does not include 125°C operating junction temperature range are assured by design, switching loss of the power FETs. characterization and correlation with statistical process controls. The LTC7151SI is guaranteed over the –40°C to 125°C operating junction
Note 4:
The LTC7151S is tested in a feedback loop that servos VITH to a temperature range. Note that the maximum ambient temperature specified voltage and measures the resultant VFB. consistent with these specifications is determined by specific
Note 5:
Bottom switch leakage current due to internal resistor to ground. Rev. 0 For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Typical Applications Package Photo Typical Application Related Parts