Datasheet LTC3809 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | No RSENSE , Low EMI, Synchronous DC/DC Controller |
| Pages / Page | 24 / 3 — ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply … |
| File Format / Size | PDF / 298 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
LTC3809
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 4.2V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
Input DC Supply Current (Note 4) Normal Operation 350 500 μA Sleep Mode 105 150 μA Shutdown RUN = 0V 9 20 μA UVLO VIN = UVLO Threshold – 200mV 3 10 μA Undervoltage Lockout Threshold (UVLO) 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 0.8 1.1 1.4 V Regulated Feedback Voltage (Note 5) l 0.591 0.6 0.609 V Output Voltage Line Regulation 2.75V < VIN < 9.8V (Note 5) 0.01 0.04 %/V Output Voltage Load Regulation ITH = 0.9V (Note 5) 0.1 0.5 % ITH = 1.7V –0.1 –0.5 % VFB Input Current (Note 5) 9 50 nA Overvoltage Protect Threshold Measured at VFB 0.66 0.68 0.7 V Overvoltage Protect Hysteresis 20 mV Auxiliary Feedback Threshold 0.325 0.4 0.475 V 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 Current Sense Voltage (ΔV l SENSE(MAX)) IPRG = Floating (Note 6) 110 125 140 mV (V l IN – SW) IPRG = 0V (Note 6) 70 85 100 mV IPRG = VIN (Note 6) l 185 204 223 mV Soft-Start Time (Internal) Time for VFB to Ramp from 0.05V to 0.55V 0.5 0.74 0.9 ms
Oscillator and Phase-Locked Loop
Oscillator Frequency Unsynchronized (SYNC/MODE 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/MODE Clocked Minimum Synchronizable Frequency 200 250 kHz Maximum Synchronizible Frequency 750 1000 kHz Phase Detector Output Current Sinking fOSC > fSYNC/MODE –3 μA Sourcing fOSC < fSYNC/MODE 3 μA Spread Spectrum Frequency Range Minimum Switching Frequency 460 kHz Maximum Switching Frequency 635 kHz SYNC/MODE Pull-Down Current SYNC/MODE = 2.2V 2.6 μA
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 °C/W) reliability and lifetime.
Note 4:
Dynamic supply current is higher due to gate charge being
Note 2:
The LTC3809E 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 LTC3809 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.
Note 6:
Peak current sense voltage is reduced dependent on duty cycle to a percentage of value as shown in Figure 1. 3809fc 3
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 4.2V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
Input DC Supply Current (Note 4) Normal Operation 350 500 μA Sleep Mode 105 150 μA Shutdown RUN = 0V 9 20 μA UVLO VIN = UVLO Threshold – 200mV 3 10 μA Undervoltage Lockout Threshold (UVLO) 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 0.8 1.1 1.4 V Regulated Feedback Voltage (Note 5) l 0.591 0.6 0.609 V Output Voltage Line Regulation 2.75V < VIN < 9.8V (Note 5) 0.01 0.04 %/V Output Voltage Load Regulation ITH = 0.9V (Note 5) 0.1 0.5 % ITH = 1.7V –0.1 –0.5 % VFB Input Current (Note 5) 9 50 nA Overvoltage Protect Threshold Measured at VFB 0.66 0.68 0.7 V Overvoltage Protect Hysteresis 20 mV Auxiliary Feedback Threshold 0.325 0.4 0.475 V 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 Current Sense Voltage (ΔV l SENSE(MAX)) IPRG = Floating (Note 6) 110 125 140 mV (V l IN – SW) IPRG = 0V (Note 6) 70 85 100 mV IPRG = VIN (Note 6) l 185 204 223 mV Soft-Start Time (Internal) Time for VFB to Ramp from 0.05V to 0.55V 0.5 0.74 0.9 ms
Oscillator and Phase-Locked Loop
Oscillator Frequency Unsynchronized (SYNC/MODE 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/MODE Clocked Minimum Synchronizable Frequency 200 250 kHz Maximum Synchronizible Frequency 750 1000 kHz Phase Detector Output Current Sinking fOSC > fSYNC/MODE –3 μA Sourcing fOSC < fSYNC/MODE 3 μA Spread Spectrum Frequency Range Minimum Switching Frequency 460 kHz Maximum Switching Frequency 635 kHz SYNC/MODE Pull-Down Current SYNC/MODE = 2.2V 2.6 μA
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 °C/W) reliability and lifetime.
Note 4:
Dynamic supply current is higher due to gate charge being
Note 2:
The LTC3809E 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 LTC3809 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.
Note 6:
Peak current sense voltage is reduced dependent on duty cycle to a percentage of value as shown in Figure 1. 3809fc 3
