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LTC3860 Datasheet(PDF) 4 Page - Linear Technology |
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LTC3860 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 36 page  LTC3860 3860f elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. VCC = 5V, VRUN1,2 = 5V, VFREQ = VCLKIN = 0V, VFB = 0.6V, fOSC = 0.6MHz unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS tCLKIN(LO) CLKIN Pulse Width Low VCLKIN = 0V to 5V 100 ns RCLKIN CLKIN Pull-Up Resistance 13 kΩ VCLKIN CLKIN Input Threshold VCLKIN Falling VCLKIN Rising 1.2 2 V V VFREQ FREQ Input Threshold VCLKIN = 0V VFREQ Falling VFREQ Rising 1.5 2.5 V V VOL(CLKOUT) CLKOUT Low Output Voltage ILOAD = –500µA 0.2 V VOH(CLKOUT) CLKOUT High Output Voltage ILOAD = 500µA VCC – 0.2 V θ2-θ1 Channel 1-to-Channel 2 Phase Relationship VPHSMD = 0V VPHSMD = Float VPHSMD = VCC 180 180 120 Deg Deg Deg θCLKOUT-θ1 CLKOUT-to-Channel 1 Phase Relationship VPHSMD = 0V VPHSMD = Float VPHSMD = VCC 60 90 240 Deg Deg Deg PWM/PWMEN Outputs PWM PWM Output High Voltage ILOAD = 500µA l 4.5 V PWM Output Low Voltage ILOAD = –500µA l 0.5 V PWM Output Current in Hi-Z State ±5 µA PWM Maximum Duty Cycle 91.5 % PWMEN PWMEN Output High Voltage ILOAD = 1mA l 4.5 V Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • θJA) Note 3: The LTC3860E is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LTC3860I is guaranteed over the full –40°C to 125°C operating junction temperature range. The maximum ambient temperature is determined by specific operating conditions in conjunction with board layout, the rated package thermal resistors and other environmental factors. Typical perFormance characTerisTics Load Step Transient Response (Single Phase) Load Step Transient Response (2-Phase) 50µs/DIV 3860 G01 VIN = 12V VOUT = 1.2V ILOAD STEP = 10A COMP VALUES: R2A = 6.8k, C1A = 470pF, C2A = 100pF VOUT 50mV/DIV ILOAD 10A/DIV IL 10A/DIV Load Step Transient Response (2-Phase) VOUT 50mV/DIV 50µs/DIV 3860 G02 VIN = 12V VOUT = 1.8V ILOAD STEP = 10A IL1 5A/DIV ILOAD 10A/DIV IL2 5A/DIV VOUT 50mV/DIV 50µs/DIV 3860 G03 VIN = 12V VOUT = 1.2V ILOAD STEP = 10A IL1 5A/DIV ILOAD 10A/DIV IL2 5A/DIV |
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