Datasheet LTC3546 (Analog Devices) - 5

LTC3546
ELECTRICAL CHARACTERISTICS The
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denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = VCCA = 3.6V, unless otherwise specified. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ISW1D(LKG) Switch Leakage Current SW1D VIN = 6V 0.01 1 µA VITH1 = VITH2 = 0V VRUN1 = VRUN2 = 0V ISW2A/B(LKG) Switch Leakage Current SW2A/B VIN = 6V 0.01 1 µA VITH2 = 0V VRUN2 = 0V VUVLO Undervoltage Lockout Threshold VIN1, VIN2, VCCA, VCCD Rising 2.03 2.14 2.28 V VIN1, VIN2, VCCA, VCCD Falling 1.86 1.97 2.11 V TPGOOD1 Threshold for Power Good VFB1 Ramping Up, VSYNC/MODE = 0V –8 % Percentage Deviation from Regulated VFB1 (Typically 0.6V). TPGOOD2 Threshold for Power Good VFB2 Ramping Up, VSYNC/MODE = 0V –8 % Percentage Deviation from Regulated VFB2 (Typically 0.6V). RPGOOD1 Power Good Pull-Down On-Resistance 132 300 Ω RPGOOD2 Power Good Pull-Down On-Resistance 132 300 Ω tSS Soft-Start Internal Time. VFB from 0% to 95%, VTRACK/SS Is Floating 0.8 1.2 1.9 ms VRUN1, VRUN2, RUN1, RUN2, and PHASE Threshold 0.3 0.8 1.2 V VPHASE IRUN1, IRUN2, RUN1, RUN2, and PHASE Leakage Current VIN = 6V, VPHASE = 3V, VRUN1 = VRUN2 = 3V ±0.01 ±1 µA IPHASE VTLSYNC/MODE SYNC/MODE Threshold Voltage Low to Put 0.5 V the Part into Pulse-Skipping Mode VTHSYNC/MODE SYNC/MODE Threshold Voltage High to VIN – 0.5 V Put the Part into Burst Mode Operation VSYNC/MODE SYNC/MODE Threshold for Clock 0.3 0.8 1.2 V Synchronization ISYNC/MODE SYNC/MODE Leakage Current VIN = 6V, VSYNC/MODE = 3V ±0.01 ±1 µA VTHFREQ FREQ Threshold Voltage High VIN – 0.85 V IBMC1, IBMC2 BMC1, BMC2 Leakage Current VIN = 6V, VBMC = 3V ±0.4 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
Total supply current is higher due to the internal gate charge being may cause permanent damage to the device. Exposure to any Absolute delivered at the switching frequency. Maximum Rating condition for extended periods may affect device
Note 5:
Variable frequency operation with resistor is guaranteed by design reliability and lifetime. and is subject to duty cycle limitations.
Note 2:
The LTC3546 is tested under pulsed load conditions such that
Note 6:
This IC includes overtemperature protection that is intended TJ ≈ TA. The LTC3546E is guaranteed to meet performance specifications to protect the device during momentary overload conditions. Junction from 0°C to 85°C. Specifications over the –40°C to 125°C operating temperature will exceed 125°C when overtemperature protection is active. junction temperature range are assured by design, characterization and Continuous operation above the specified maximum operating junction correlation with statistical process controls. The LTC3546I is guaranteed temperature may impair device reliability. to meet performance specifications over the full –40°C to 125°C operating
Note 7:
T junction temperature range. The maximum ambient temperature J is calculated from the ambient temperature, TA, and power dissipation, P consistent with these specifications is determined by specific operating D, according to the following formula: conditions in conjunction with board layout, the rated package thermal TJ = TA + (PD • 34°C/W) impedance and other environmental factors.
Note 8:
Minimum current limit is guaranteed by design and correlation to
Note 3:
The LTC3546 is tested in feedback loop which servos V the RDS(ON)1D, ILIM1 and ILIM2 measurements. FB1 to the midpoint for the error amplifier (VITH1 = 0.6V) and VFB2 to the midpoint for the error amplifier (VITH2 = 0.6V). 3546fd For more information www.linear.com/3546 5