Datasheet LTC3822-1 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | No RSENSE , Low Input Voltage, Synchronous Step-Down DC/DC Controller |
| Pages / Page | 24 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| File Format / Size | PDF / 389 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LTC3822-1
ELECTRICAL CHARACTERISTICS The
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 3.3V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage Load Regulation ITH = 1.3V to 0.9V (Note 5) 0.1 0.5 % ITH = 1.3V to 1.7V –0.1 –0.5 % TRACK/SS Pull-Up Current TRACK/SS = 0V 0.65 1 1.35 µA VFB Input Current (Note 5) 10 50 nA Overvoltage Protect Threshold Measured at VFB 0.66 0.68 0.70 V Overvoltage Protect Hysteresis 20 mV Top Gate (TG) Drive Rise Time CL = 3000pF 40 ns Top Gate (TG) Drive Fall Time CL = 3000pF 40 ns Bottom Gate (BG) Drive Rise Time CL = 3000pF 50 ns Bottom Gate (BG) Drive Fall Time CL = 3000pF 40 ns Maximum Duty Cycle In Dropout 99 % Maximum Current Sense Voltage (VIN – SW) IPRG = Floating ● 110 125 140 mV (ΔVSENSE(MAX)) IPRG = 0V ● 70 82 95 mV IPRG = VIN ● 185 200 220 mV Soft-Start Time Time for VFB to Ramp from 0.05V to 0.55V 650 µs
Oscillator
Oscillator Frequency PLLLPF = Floating 480 550 600 kHz PLLLPF = 0V 240 300 340 kHz PLLLPF = VIN 640 750 850 kHz Phase-Locked Loop Lock Range SYNC/MODE Clocked Minimum Synchronizable Frequency 200 250 kHz Maximum Synchronizable Frequency 750 1000 kHz Phase detector Output Current Sinking fOSC > fSYNC/MODE –5 µA Sourcing fOSC < fSYNC/MODE 5 µA
PGOOD Output (GN Package Only)
PGOOD Voltage Low IPGOOD Sinking 1mA 100 mV PGOOD Trip Level VFB with Respect to Set Output Voltage VFB < 0.6V, Ramping Postive –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:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
TJ is calculated from the ambient temperature TA and power may cause permanent damage to the device. Exposure to any Absolute dissipation PD according to the following formula: Maximum Rating condition for extended periods may affect device TJ = TA + (PD • θJA) reliability and lifetime.
Note 4:
Dynamic supply current is higher due to gate charge being
Note 2:
The LTC3822E-1 is guaranteed to meet specifi ed performance delivered at the switching frequency. from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating range
Note 5:
The LTC3822-1 is tested in a feedback loop that servos ITH to a are assured by design characterization, and correlation with statistical specifi ed voltage and measures the resultant VFB voltage. process controls. 38221f 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 3.3V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage Load Regulation ITH = 1.3V to 0.9V (Note 5) 0.1 0.5 % ITH = 1.3V to 1.7V –0.1 –0.5 % TRACK/SS Pull-Up Current TRACK/SS = 0V 0.65 1 1.35 µA VFB Input Current (Note 5) 10 50 nA Overvoltage Protect Threshold Measured at VFB 0.66 0.68 0.70 V Overvoltage Protect Hysteresis 20 mV Top Gate (TG) Drive Rise Time CL = 3000pF 40 ns Top Gate (TG) Drive Fall Time CL = 3000pF 40 ns Bottom Gate (BG) Drive Rise Time CL = 3000pF 50 ns Bottom Gate (BG) Drive Fall Time CL = 3000pF 40 ns Maximum Duty Cycle In Dropout 99 % Maximum Current Sense Voltage (VIN – SW) IPRG = Floating ● 110 125 140 mV (ΔVSENSE(MAX)) IPRG = 0V ● 70 82 95 mV IPRG = VIN ● 185 200 220 mV Soft-Start Time Time for VFB to Ramp from 0.05V to 0.55V 650 µs
Oscillator
Oscillator Frequency PLLLPF = Floating 480 550 600 kHz PLLLPF = 0V 240 300 340 kHz PLLLPF = VIN 640 750 850 kHz Phase-Locked Loop Lock Range SYNC/MODE Clocked Minimum Synchronizable Frequency 200 250 kHz Maximum Synchronizable Frequency 750 1000 kHz Phase detector Output Current Sinking fOSC > fSYNC/MODE –5 µA Sourcing fOSC < fSYNC/MODE 5 µA
PGOOD Output (GN Package Only)
PGOOD Voltage Low IPGOOD Sinking 1mA 100 mV PGOOD Trip Level VFB with Respect to Set Output Voltage VFB < 0.6V, Ramping Postive –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:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
TJ is calculated from the ambient temperature TA and power may cause permanent damage to the device. Exposure to any Absolute dissipation PD according to the following formula: Maximum Rating condition for extended periods may affect device TJ = TA + (PD • θJA) reliability and lifetime.
Note 4:
Dynamic supply current is higher due to gate charge being
Note 2:
The LTC3822E-1 is guaranteed to meet specifi ed performance delivered at the switching frequency. from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating range
Note 5:
The LTC3822-1 is tested in a feedback loop that servos ITH to a are assured by design characterization, and correlation with statistical specifi ed voltage and measures the resultant VFB voltage. process controls. 38221f 3
