Datasheet LTC3417A (Analog Devices) - 3

LTC3417A
elecTrical characTerisTics The
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denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise specified. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IS Input DC Supply Current (Note 4) Active Mode VFB1 = VFB2 = 0.75V, VSYNC/MODE = VIN, 400 600 µA VRUN1 = VRUN2 = VIN Half Active Mode (VRUN2 = 0V, 1.5A Only) VFB1 = 0.75V, VSYNC/MODE = VIN, VRUN1 = VIN 260 400 µA Half Active Mode (VRUN1 = 0V, 1A Only) VFB2 = 0.75V, VSYNC/MODE = VIN, VRUN2 = VIN 260 400 µA Both Channels in Sleep Mode VFB1 = VFB2 = 1V, VSYNC/MODE = VIN, 125 250 µA VRUN1 = VRUN2 = VIN Shutdown VRUN1 = VRUN2 = 0V 0.1 1 µA fOSC Oscillator Frequency VFREQ = VIN 1.2 1.5 1.8 MHz VFREQ: RT = 143k 0.85 1 1.25 MHz VFREQ: Resistor (Note 6) 4 MHz ILIM1 Peak Switch Current Limit on SW1 (1.5A) 2.1 2.5 A ILIM2 Peak Switch Current Limit on SW2 (1A) 1.4 1.7 A RDS(ON)1 SW1 Top Switch On-Resistance (1.5A) VIN1 = 3.6V (Note 5) 0.088 Ω SW1 Bottom Switch On-Resistance VIN1 = 3.6V (Note 5) 0.084 Ω RDS(ON)2 SW2 Top Switch On-Resistance (1A) VIN2 = 3.6V (Note 5) 0.16 Ω SW2 Bottom Switch On-Resistance VIN2 = 3.6V (Note 5) 0.15 Ω ISW1(LKG) Switch Leakage Current SW1 (1.5A) VIN1 = 6V, VITH1 = 0V, VRUN1 = 0V 0.01 1 µA ISW2(LKG) Switch Leakage Current SW2 (1A) VIN2 = 6V, VITH2 = 0V, VRUN2 = 0V 0.01 1 µA VUVLO Undervoltage Lockout Threshold VIN1, VIN2 Ramping Down 1.9 2.07 2.2 V VIN1, VIN2 Ramping Up 1.95 2.12 2.25 V TPGOOD Threshold for Power Good. Percentage VFB1 or VFB2 Ramping Up, VSYNC/MODE = 0V –6 % Deviation from VFB Steady State VFB1 or VFB2 Ramping Down, –6 % (Typically 0.8V) VSYNC/MODE = 0V RPGOOD Power Good Pull-Down On-Resistance 160 300 Ω VRUN1, VRUN2 RUN1, RUN2 Threshold 0.3 0.85 1.5 V VPHASE PHASE Threshold High-CMOS Levels VIN –0.5 V PHASE Threshold Low-CMOS Levels 0.5 V IRUN1, IRUN2, RUN1, RUN2, PHASE and SYNC/MODE VIN = 6V, VPVIN = 3V 0.01 1 µA IPHASE, Leakage Current ISYNC/MODE VTLSYNC/MODE SYNC/MODE Threshold Voltage Low 0.5 V VTHSYNC/MODE SYNC/MODE Threshold Voltage High VIN –0.5 V VTHFREQ FREQ Threshold Voltage High VIN –0.5 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 5:
Switch on-resistance is guaranteed by design and test correlation may cause permanent damage to the device. Exposure to any Absolute on the DHC package and by final test correlation on the FE package. Maximum Rating condition for extended periods may affect device
Note 6:
Variable frequency operation with resistor is guaranteed by design reliability and lifetime. but not production tested and is subject to duty cycle limitations.
Note 2:
The LTC3417AE is guaranteed to meet specified performance from
Note 7:
This IC includes overtemperature protection that is intended 0°C to 85°C. Specifications over the –40°C to 85°C operating ambient to protect the device during momentary overload conditions. Junction temperature range are assured by design, characterization and correlation temperature will exceed 125°C when overtemperature protection is active. with statistical process controls. The LTC3417AI is guaranteed to meet Continuous operation above the specified maximum operating junction performance specifications over the –40°C to 85°C operating temperature temperature may impair device reliability. range.
Note 8:
TJ is calculated from the ambient temperature, TA, and power dis-
Note 3:
The LTC3417A is tested in feedback loop which servos VFB1 to the sipation, PD, according to the following formula: midpoint for the error amplifier (VITH1 = 0.6V) and VFB2 to the midpoint for LTC3417AEDHC: T the error amplifier (V J = TA + (PD • 43°C/W) ITH2 = 0.6V). LTC3417AEFE: T
Note 4:
Total supply current is higher due to the internal gate charge being J = TA + (PD • 38°C/W) delivered at the switching frequency. 3417afc 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Revision History Related Parts