Datasheet LTC3736 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Dual 2-Phase, No RSENSE , Synchronous Controller with Output Tracking |
| Pages / Page | 28 / 3 — ELECTRICAL CHARACTERISTICS The. denotes specifications that apply over … |
| File Format / Size | PDF / 447 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The. denotes specifications that apply over the full operating temperature
Model Line for this Datasheet
Text Version of Document
LTC3736
ELECTRICAL CHARACTERISTICS The
●
denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 4.2V unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage Load Regulation ITH = 0.9V (Note 5) 0.12 0.5 % ITH = 1.7V –0.12 –0.5 % VFB1,2 Input Current (Note 5) 10 50 nA TRACK Input Current TRACK = 0.6V 10 50 nA Overvoltage Protect Threshold Measured at VFB 0.66 0.68 0.7 V Overvoltage Protect Hysteresis 20 mV Auxiliary Feedback Threshold SYNC/FCB Ramping Positive 0.525 0.6 0.675 V Top Gate (TG) Drive 1, 2 Rise Time CL = 3000pF 40 ns Top Gate (TG) Drive 1, 2 Fall Time CL = 3000pF 40 ns Bottom Gate (BG) Drive 1, 2 Rise Time CL = 3000pF 50 ns Bottom Gate (BG) Drive 1, 2 Fall Time CL = 3000pF 40 ns Maximum Current Sense Voltage (∆VSENSE(MAX)) IPRG = Floating ● 110 125 140 mV (SENSE+ – SW) IPRG = 0V ● 70 85 100 mV IPRG = VIN ● 185 204 223 mV Soft-Start Time Time for VFB1 to Ramp from 0.05V to 0.55V 0.667 0.833 1 ms
Oscillator and Phase-Locked Loop
Oscillator Frequency Unsynchronized (SYNC/FCB Not Clocked) PLLLPF = Floating ● 480 550 600 kHz PLLLPF = 0V ● 260 300 340 kHz PLLLPF = VIN ● 650 750 825 kHz Phase-Locked Loop Lock Range SYNC/FCB Clocked Minimum Synchronizable Frequency ● 200 250 kHz Maximum Synchronizable Frequency ● 850 1150 kHz Phase Detector Output Current Sinking fOSC > fSYNC/FCB –4 µA Sourcing fOSC < fSYNC/FCB 4 µA
PGOOD Output
PGOOD Voltage Low IPGOOD Sinking 1mA 125 mV PGOOD Trip Level VFB with Respect to Set Output Voltage VFB < 0.6V, Ramping Positive –13 –10.0 –7 % VFB < 0.6V, Ramping Negative –16 –13.3 –10 % VFB > 0.6V, Ramping Negative 7 10.0 13 % VFB > 0.6V, Ramping Positive 10 13.3 16 %
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 4:
Dynamic supply current is higher due to gate charge being of a device may be impaired. delivered at the switching frequency.
Note 2:
The LTC3736E is guaranteed to meet specified performance from
Note 5:
The LTC3736 is tested in a feedback loop that servos ITH to a 0°C to 70°C. Specifications over the –40°C to 85°C operating range are specified voltage and measures the resultant VFB voltage. assured by design, characterization and correlation with statistical process
Note 6:
Peak current sense voltage is reduced dependent on duty cycle to controls. a percentage of value as shown in Figure 1.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • θJA°C/W) 3736fa 3
ELECTRICAL CHARACTERISTICS The
●
denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 4.2V unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage Load Regulation ITH = 0.9V (Note 5) 0.12 0.5 % ITH = 1.7V –0.12 –0.5 % VFB1,2 Input Current (Note 5) 10 50 nA TRACK Input Current TRACK = 0.6V 10 50 nA Overvoltage Protect Threshold Measured at VFB 0.66 0.68 0.7 V Overvoltage Protect Hysteresis 20 mV Auxiliary Feedback Threshold SYNC/FCB Ramping Positive 0.525 0.6 0.675 V Top Gate (TG) Drive 1, 2 Rise Time CL = 3000pF 40 ns Top Gate (TG) Drive 1, 2 Fall Time CL = 3000pF 40 ns Bottom Gate (BG) Drive 1, 2 Rise Time CL = 3000pF 50 ns Bottom Gate (BG) Drive 1, 2 Fall Time CL = 3000pF 40 ns Maximum Current Sense Voltage (∆VSENSE(MAX)) IPRG = Floating ● 110 125 140 mV (SENSE+ – SW) IPRG = 0V ● 70 85 100 mV IPRG = VIN ● 185 204 223 mV Soft-Start Time Time for VFB1 to Ramp from 0.05V to 0.55V 0.667 0.833 1 ms
Oscillator and Phase-Locked Loop
Oscillator Frequency Unsynchronized (SYNC/FCB Not Clocked) PLLLPF = Floating ● 480 550 600 kHz PLLLPF = 0V ● 260 300 340 kHz PLLLPF = VIN ● 650 750 825 kHz Phase-Locked Loop Lock Range SYNC/FCB Clocked Minimum Synchronizable Frequency ● 200 250 kHz Maximum Synchronizable Frequency ● 850 1150 kHz Phase Detector Output Current Sinking fOSC > fSYNC/FCB –4 µA Sourcing fOSC < fSYNC/FCB 4 µA
PGOOD Output
PGOOD Voltage Low IPGOOD Sinking 1mA 125 mV PGOOD Trip Level VFB with Respect to Set Output Voltage VFB < 0.6V, Ramping Positive –13 –10.0 –7 % VFB < 0.6V, Ramping Negative –16 –13.3 –10 % VFB > 0.6V, Ramping Negative 7 10.0 13 % VFB > 0.6V, Ramping Positive 10 13.3 16 %
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 4:
Dynamic supply current is higher due to gate charge being of a device may be impaired. delivered at the switching frequency.
Note 2:
The LTC3736E is guaranteed to meet specified performance from
Note 5:
The LTC3736 is tested in a feedback loop that servos ITH to a 0°C to 70°C. Specifications over the –40°C to 85°C operating range are specified voltage and measures the resultant VFB voltage. assured by design, characterization and correlation with statistical process
Note 6:
Peak current sense voltage is reduced dependent on duty cycle to controls. a percentage of value as shown in Figure 1.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD • θJA°C/W) 3736fa 3
