Datasheet LTC3701 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller |
| Pages / Page | 20 / 3 — ELECTRICAL CHARACTERISTICS The. denotes specifications which apply over … |
| File Format / Size | PDF / 261 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The. denotes specifications which apply over the full operating
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LTC3701
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VIN = 4.2V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Oscillator and Phase-Locked Loop
Oscillator Frequency VPLLLPF = 1.2V or Floating 500 550 600 kHz VPLLLPF = 0V 230 280 320 kHz VPLLLPF ≥ 2.4V 690 775 890 kHz Phase Detector Output Current Sinking fEXTCLK/MODE < fOSC – 5 µA Sourcing fEXTCLK/MODE > fOSC 5 µA
PGOOD Output
PGOOD Voltage Low IPGOOD = 500µA 70 150 mV PGOOD Trip Level VFB with Respect to Set Output Voltage VFB Ramping Positive –15 –8 –2.5 % VFB Ramping Negative 2.5 8 15 %
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 LTC3701E is guaranteed to meet performance specifications
Note 5:
The LTC3701 is tested in a feedback loop that servos ITH/RUN to a from 0°C to 70°C. Specifications over the –40°C to 85°C operating specified voltage and measures the resultant VFB voltage. temperature range are assured by design, characterization and correlation
Note 6:
Peak current sense voltage is reduced dependent on duty cycle to with statistical process controls. a percentage of value as given 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)
W U TYPICAL PERFOR A CE CHARACTERISTICS Shutdown Threshold Oscillator Frequency Reference Voltage vs Temperature vs Temperature vs Temperature
0.810 0.50 1000 VIN = 4.2V V 0.48 VIN = 4.2V IN = 4.2V 900 0.805 0.46 PLLLPF = 2.4V 0.44 800 0.42 0.800 700 0.40 0.38 600 PLLLPF = FLOAT 0.795 0.36 500 0.34 0.790 0.32 400 /RUN VOLTAGE (V) 0.30 FREQUENCY (kHz) PLLLPF = 0V 0.785 I TH 300 REFERENCE VOLTAGE (V) 0.28 0.26 200 0.780 0.24 100 0.22 0.775 0.20 0 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3701 G01 3701 G02 3701 G03 3701fa 3
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VIN = 4.2V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Oscillator and Phase-Locked Loop
Oscillator Frequency VPLLLPF = 1.2V or Floating 500 550 600 kHz VPLLLPF = 0V 230 280 320 kHz VPLLLPF ≥ 2.4V 690 775 890 kHz Phase Detector Output Current Sinking fEXTCLK/MODE < fOSC – 5 µA Sourcing fEXTCLK/MODE > fOSC 5 µA
PGOOD Output
PGOOD Voltage Low IPGOOD = 500µA 70 150 mV PGOOD Trip Level VFB with Respect to Set Output Voltage VFB Ramping Positive –15 –8 –2.5 % VFB Ramping Negative 2.5 8 15 %
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 LTC3701E is guaranteed to meet performance specifications
Note 5:
The LTC3701 is tested in a feedback loop that servos ITH/RUN to a from 0°C to 70°C. Specifications over the –40°C to 85°C operating specified voltage and measures the resultant VFB voltage. temperature range are assured by design, characterization and correlation
Note 6:
Peak current sense voltage is reduced dependent on duty cycle to with statistical process controls. a percentage of value as given 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)
W U TYPICAL PERFOR A CE CHARACTERISTICS Shutdown Threshold Oscillator Frequency Reference Voltage vs Temperature vs Temperature vs Temperature
0.810 0.50 1000 VIN = 4.2V V 0.48 VIN = 4.2V IN = 4.2V 900 0.805 0.46 PLLLPF = 2.4V 0.44 800 0.42 0.800 700 0.40 0.38 600 PLLLPF = FLOAT 0.795 0.36 500 0.34 0.790 0.32 400 /RUN VOLTAGE (V) 0.30 FREQUENCY (kHz) PLLLPF = 0V 0.785 I TH 300 REFERENCE VOLTAGE (V) 0.28 0.26 200 0.780 0.24 100 0.22 0.775 0.20 0 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3701 G01 3701 G02 3701 G03 3701fa 3
