Datasheet LTC3736 (Analog Devices) - 3

FabricanteAnalog Devices
DescripciónDual 2-Phase, No RSENSE , Synchronous Controller with Output Tracking
Páginas / Página28 / 3 — ELECTRICAL CHARACTERISTICS The. denotes specifications that apply over …
Formato / tamaño de archivoPDF / 447 Kb
Idioma del documentoInglés

ELECTRICAL CHARACTERISTICS The. denotes specifications that apply over the full operating temperature

ELECTRICAL CHARACTERISTICS The denotes specifications that apply over the full operating temperature

Línea de modelo para esta hoja de datos

Versión de texto del documento

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