Datasheet LTC3859AL (Analog Devices) - 6

LTC3859AL
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VBIAS = 12V, VRUN1,2,3 = 5V, EXTVCC = 0V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
TPG1 Delay For Reporting a Fault 40 µs
OV3 Boost Overvoltage Indicator Output
VOV3L OV3 Voltage Low IOV3 = 2mA 0.2 0.4 V IOV3 OV3 Leakage Current VOV3 = 5V ±1 µA VOV OV3 Trip Level VFB3 Ramping Positive with Respect to Set 6 10 13 % Regulated Voltage Hysteresis 1.5 %
BOOST3 Charge Pump
IBST3 BOOST3 Charge Pump Available Output VBOOST3 = 16V; VSW3 = 12V; 65 µA Current Forced Continuous Mode
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
This IC includes overtermperature 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 LTC3859AL is tested under pulsed load conditions such that junction temperature may impair device reliability or permanently damage T the device. J ≈ TA. The LTC3859ALE is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to
Note 4:
The LTC3859AL is tested in a feedback loop that servos VITH1,2,3 125°C operating junction temperature range are assured by design, to a specified voltage and measures the resultant VFB. The specification at characterization and correlation with statistical process controls. The 85°C is not tested in production and is assured by design, characterization LTC3859ALI is guaranteed over the –40°C to 125°C operating junction and correlation to production testing at other temperatures (125°C for the temperature range, the LTC3859ALH is guaranteed over the –40°C to LTC3859ALE/LTC3859ALI, 150°C for the LTC3859ALH/LTC3859ALMP). 150°C operating junction temperature range and the LTC3859ALMP For the LTC3859ALI and LTC3859ALH, the specification at 0°C is not is tested and guaranteed over the –55°C to 150°C operating junction tested in production and is assured by design, characterization and temperature range. High junction temperatures degrade operating correlation to production testing at –40°C. For the LTC3859ALMP, the lifetimes; operating lifetime is derated for junction temperatures greater specification at 0°C is not tested in production and is assured by design, than 125°C. Note that the maximum ambient temperature consistent with characterization and correlation to production testing at –55°C. these specifications is determined by specific operating conditions in
Note 5:
Dynamic supply current is higher due to the gate charge being conjunction with board layout, the rated package thermal impedance and delivered at the switching frequency. See the Applications Information other environmental factors. TJ is calculated from the ambient temperature section. TA and power dissipation PD according to the following formula: TJ = TA +
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay (PD • qJA), where qJA = 34.7°C/W for the QFN package and qJA = 25°C/W times are measured using 50% levels. for the TSSOP package.
Note 7:
The minimum on-time condition is specified for an inductor peak-to-peak ripple current ≥ 40% of IMAX (See the Minimum On-Time Considerations in the Applications Information section). Rev. B 6 For more information www.analog.com Document Outline Features Applications Typical Application Description 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