Datasheet LTC3822 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | No RSENSE , Low Input Voltage, Synchronous Step-Down DC/DC Controller |
| 页数 / 页 | 20 / 3 — ELECTRICAL CHARACTERISTICS. The. indicates specifi cations that apply over … |
| 文件格式/大小 | PDF / 209 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS. The. indicates specifi cations that apply over the full operating temperature
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LTC3822
ELECTRICAL CHARACTERISTICS The
l
indicates specifi cations that 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 Main Control Loops
Input DC Supply Current (Note 4) Normal Operation 340 500 μA Shutdown RUN = 0 7.5 20 μA UVLO VIN = UVLO Threshold – 200mV 10 20 μA Undervoltage Lockout Threshold VIN Falling l 1.95 2.25 2.55 V VIN Rising l 2.15 2.45 2.75 V Shutdown Threshold Of RUN Pin 0.7 1.1 1.4 V Regulated Feedback Voltage (Note 5) l 0.594 0.6 0.606 V Output Voltage Line Regulation 2.75V < VIN < 4.5V (Note 5) 0.025 0.1 %/V 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 % 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 l 110 120 140 mV (ΔVSENSE(MAX)) IPRG = 0V l 70 82 100 mV IPRG = VIN l 185 200 220 mV Soft-Start Time Time for VFB to Ramp from 0.05V to 0.55V 650 μs
Oscillator
Oscillator Frequency FREQ = Floating 480 550 600 kHz FREQ = 0V 240 300 340 kHz FREQ = VIN 640 750 850 kHz
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 is guaranteed to meet specifi ed performance from delivered at the switching frequency. 0°C to 85°C. Specifi cations over the –40°C to 85°C operating range are
Note 5:
The LTC3822 is tested in a feedback loop that servos ITH to a assured by design characterization, and correlation with statistical process specifi ed voltage and measures the resultant VFB voltage. controls. 3822fa 3
ELECTRICAL CHARACTERISTICS The
l
indicates specifi cations that 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 Main Control Loops
Input DC Supply Current (Note 4) Normal Operation 340 500 μA Shutdown RUN = 0 7.5 20 μA UVLO VIN = UVLO Threshold – 200mV 10 20 μA Undervoltage Lockout Threshold VIN Falling l 1.95 2.25 2.55 V VIN Rising l 2.15 2.45 2.75 V Shutdown Threshold Of RUN Pin 0.7 1.1 1.4 V Regulated Feedback Voltage (Note 5) l 0.594 0.6 0.606 V Output Voltage Line Regulation 2.75V < VIN < 4.5V (Note 5) 0.025 0.1 %/V 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 % 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 l 110 120 140 mV (ΔVSENSE(MAX)) IPRG = 0V l 70 82 100 mV IPRG = VIN l 185 200 220 mV Soft-Start Time Time for VFB to Ramp from 0.05V to 0.55V 650 μs
Oscillator
Oscillator Frequency FREQ = Floating 480 550 600 kHz FREQ = 0V 240 300 340 kHz FREQ = VIN 640 750 850 kHz
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 is guaranteed to meet specifi ed performance from delivered at the switching frequency. 0°C to 85°C. Specifi cations over the –40°C to 85°C operating range are
Note 5:
The LTC3822 is tested in a feedback loop that servos ITH to a assured by design characterization, and correlation with statistical process specifi ed voltage and measures the resultant VFB voltage. controls. 3822fa 3