Datasheet LTC3736-1 (Analog Devices) - 3

LTC3736-1
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 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 IPRG = Floating (Note 6) ● 110 125 140 mV (SENSE+ – SW)(∆VSENSE(MAX)) 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
Spread Spectrum Oscillator
Oscillator Frequency Spread Spectrum Disabled (SSDIS = VIN) VFREQ = Floating ● 480 550 600 kHz VFREQ = 0V ● 260 300 340 kHz VFREQ = VIN ● 650 750 825 kHz Spread Spectrum Frequency Range SSDIS = GND Minimum Switching Frequency 450 kHz Maximum Switching Frequency 580 kHz
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-1 is guaranteed to meet specified performance
Note 5:
The LTC3736-1 is tested in a feedback loop that servos ITH to a from 0°C to 70°C. Specifications over the –40°C to 85°C operating range specified voltage and measures the resultant VFB voltage. are assured by design, characterization and correlation with statistical
Note 6:
Peak current sense voltage is reduced dependent on duty cycle to process controls. a percentage of value as shown in Figure 2.
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) 37361f 3