Datasheet LTC3708 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Fast 2-Phase, No RSENSE Buck Controller with Output Tracking |
| Pages / Page | 34 / 4 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 667 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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LTC3708
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, DRVCC = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS PGOOD Output
∆VFBH1,2 PGOOD Upper Threshold Either VFB Rising 8.5 10 11.5 % ∆VFBL1,2 PGOOD Lower Threshold Either VFB Falling –8.5 –10 –11.5 % ∆VFB(HYS)1,2 PGOOD Hysteresis VFB Returning 3 5 % VPGL PGOOD Low Voltage IPGOOD = 5mA 0.1 0.4 V IPGOOD PGOOD Leakage Current VPGOOD = 7V ±1 µA PG Delay PGOOD Delay VFB Falling 100 µs
Phase-Locked Loops
VFCB(DC) Forced Continuous Threshold Measured with a DC Voltage at FCB Pin 1.9 2.1 2.3 V VFCB(AC) Clock Input Threshold Measured with a AC Pulse at FCB Pin 1 1.5 2 V IEXTLPF External Phase Detector Output Current Sourcing Capability fFCB < fSW1, VEXTLPF = 0V 20 µA Sinking Capability fFCB > fSW1, VEXTLPF = 2.4V –20 µA IINTLPF Internal Phase Detector Output Current Sourcing Capability fSW1 < fSW2, VINTLPF = 0V 20 µA Sinking Capability fSW1 > fSW2, VINTLPF = 2.4V –20 µA tON(PLL)1 tON1 Modulation Range by External PLL Up Modulation ION1 = 60µA, VEXTLPF = 1.8V 186 233 ns Down Modulation ION1 = 60µA, VEXTLPF = 0.6V 58 80 ns tON(PLL)2 tON2 Modulation Range by Internal PLL Up Modulation ION1 = 60µA, VEXTLPF = 1.8V 186 233 ns Down Modulation ION1 = 60µA, VEXTLPF = 0.6V 58 80 ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
Internal reference voltage is tested indirectly by extracting error may cause permanent damage to the device. Exposure to any Absolute amplifier offset from the feedback voltage. Maximum Rating condition for extended periods may affect device
Note 5:
The LTC3708E is guaranteed to meet performance specifications reliabilty and lifetime. from 0°C to 85°C. Specifications over the –40°C to 85°C operating
Note 2:
TJ is calculated from the ambient temperature TA and power temperature range are assured by design, characterization and correlation dissipation PD as follows: with statistical process controls. TJ = TA + (PD • 34°C/W)
Note 6:
RDS(ON) limit is guaranteed by design and/or correlation to static
Note 3:
The LTC3708 is tested in a feedback loop that adjusts V test. FB to achieve a specified error amplifier output voltage (ITH). 3708fc 4 For more information www.linear.com/LTC3708 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Package Description Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, DRVCC = 5V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS PGOOD Output
∆VFBH1,2 PGOOD Upper Threshold Either VFB Rising 8.5 10 11.5 % ∆VFBL1,2 PGOOD Lower Threshold Either VFB Falling –8.5 –10 –11.5 % ∆VFB(HYS)1,2 PGOOD Hysteresis VFB Returning 3 5 % VPGL PGOOD Low Voltage IPGOOD = 5mA 0.1 0.4 V IPGOOD PGOOD Leakage Current VPGOOD = 7V ±1 µA PG Delay PGOOD Delay VFB Falling 100 µs
Phase-Locked Loops
VFCB(DC) Forced Continuous Threshold Measured with a DC Voltage at FCB Pin 1.9 2.1 2.3 V VFCB(AC) Clock Input Threshold Measured with a AC Pulse at FCB Pin 1 1.5 2 V IEXTLPF External Phase Detector Output Current Sourcing Capability fFCB < fSW1, VEXTLPF = 0V 20 µA Sinking Capability fFCB > fSW1, VEXTLPF = 2.4V –20 µA IINTLPF Internal Phase Detector Output Current Sourcing Capability fSW1 < fSW2, VINTLPF = 0V 20 µA Sinking Capability fSW1 > fSW2, VINTLPF = 2.4V –20 µA tON(PLL)1 tON1 Modulation Range by External PLL Up Modulation ION1 = 60µA, VEXTLPF = 1.8V 186 233 ns Down Modulation ION1 = 60µA, VEXTLPF = 0.6V 58 80 ns tON(PLL)2 tON2 Modulation Range by Internal PLL Up Modulation ION1 = 60µA, VEXTLPF = 1.8V 186 233 ns Down Modulation ION1 = 60µA, VEXTLPF = 0.6V 58 80 ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
Internal reference voltage is tested indirectly by extracting error may cause permanent damage to the device. Exposure to any Absolute amplifier offset from the feedback voltage. Maximum Rating condition for extended periods may affect device
Note 5:
The LTC3708E is guaranteed to meet performance specifications reliabilty and lifetime. from 0°C to 85°C. Specifications over the –40°C to 85°C operating
Note 2:
TJ is calculated from the ambient temperature TA and power temperature range are assured by design, characterization and correlation dissipation PD as follows: with statistical process controls. TJ = TA + (PD • 34°C/W)
Note 6:
RDS(ON) limit is guaranteed by design and/or correlation to static
Note 3:
The LTC3708 is tested in a feedback loop that adjusts V test. FB to achieve a specified error amplifier output voltage (ITH). 3708fc 4 For more information www.linear.com/LTC3708 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Package Description Typical Application Related Parts
