Datasheet LTC3727, LTC3727-1 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators |
| Pages / Page | 32 / 4 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| File Format / Size | PDF / 381 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LTC3727/LTC3727-1
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RPLLIN PLLIN Input Resistance 50 kΩ IPLLFLTR Phase Detector Output Current Sinking Capability fPLLIN < fOSC –15 μA Sourcing Capability fPLLIN > fOSC 15 μA
3.3V Linear Regulator
V3.3OUT 3.3V Regulator Output Voltage No Load ● 3.25 3.35 3.45 V V3.3IL 3.3V Regulator Load Regulation I3.3 = 0mA to 10mA 0.5 2.5 % V3.3VL 3.3V Regulator Line Regulation 6V < VIN < 30V (LTC3727) 0.05 0.2 % 6V < VIN < 30V (LTC3727-1) 0.05 0.3 %
PGOOD Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 μA VPG PGOOD Trip Level, Either Controller VOSENSE with Respect to Set Output Voltage VOSENSE Ramping Negative – 6 –7.5 – 9.5 % VOSENSE Ramping Positive 6 7.5 9.5 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings LTC3727EG/LTC3727EG-1/LTC3727IG-1: TJ = TA + (PD • 95 °C/W) may cause permanent damage to the device. Exposure to any Absolute LTC3727EUH-1: TJ = TA + (PD • 34 °C/W) Maximum Rating condition for extended periods may affect device
Note 4:
The LTC3727/LTC3727-1 are tested in a feedback loop that servos reliability and lifetime. VITH1, 2 to a specified voltage and measures the resultant VOSENSE1, 2.
Note 2:
The LTC3727E/LTC3727E-1 are guaranteed to meet performance
Note 5:
Dynamic supply current is higher due to the gate charge being specifications from 0°C to 85°C. Specifications over the –40°C to 85°C delivered at the switching frequency. See Applications Information. operating temperature range are assured by design, characterization and
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay correlation with statistical process controls. The LTC3727IG-1 is times are measured using 50% levels. guaranteed to meet performance specifications over the –40°C to 85°C
Note 7:
The minimum on-time condition is specified for an inductor operating temperature range. peak-to-peak ripple current ≥ 40% of IMAX (see minimum on-time
Note 3:
TJ is calculated from the ambient temperature TA and power considerations in the Applications Information section). dissipation PD according to the following formulas:
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Output Current Efficiency vs Output Current Efficiency vs Input Voltage and Mode (Figure 13) (Figure 13) (Figure 13)
100 100 100 Burst Mode V VOUT = 5V 90 IN = 7V OPERATION IOUT = 3A 80 FORCED 90 90 CONTINUOUS 70 MODE VIN = 10V VIN = 15V 60 80 80 50 VIN = 20V CONSTANT 40 70 70 EFFICIENCY (%) FREQUENCY EFFICIENCY (%) EFFICIENCY (%) 30 (BURST DISABLE) 20 60 60 10 VIN = 15V VOUT = 8.5V VOUT = 5V 0 50 50 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 5 15 25 35 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3727 G01 3727 G02 3727 G03 3727fc 4
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
RPLLIN PLLIN Input Resistance 50 kΩ IPLLFLTR Phase Detector Output Current Sinking Capability fPLLIN < fOSC –15 μA Sourcing Capability fPLLIN > fOSC 15 μA
3.3V Linear Regulator
V3.3OUT 3.3V Regulator Output Voltage No Load ● 3.25 3.35 3.45 V V3.3IL 3.3V Regulator Load Regulation I3.3 = 0mA to 10mA 0.5 2.5 % V3.3VL 3.3V Regulator Line Regulation 6V < VIN < 30V (LTC3727) 0.05 0.2 % 6V < VIN < 30V (LTC3727-1) 0.05 0.3 %
PGOOD Output
VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 μA VPG PGOOD Trip Level, Either Controller VOSENSE with Respect to Set Output Voltage VOSENSE Ramping Negative – 6 –7.5 – 9.5 % VOSENSE Ramping Positive 6 7.5 9.5 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings LTC3727EG/LTC3727EG-1/LTC3727IG-1: TJ = TA + (PD • 95 °C/W) may cause permanent damage to the device. Exposure to any Absolute LTC3727EUH-1: TJ = TA + (PD • 34 °C/W) Maximum Rating condition for extended periods may affect device
Note 4:
The LTC3727/LTC3727-1 are tested in a feedback loop that servos reliability and lifetime. VITH1, 2 to a specified voltage and measures the resultant VOSENSE1, 2.
Note 2:
The LTC3727E/LTC3727E-1 are guaranteed to meet performance
Note 5:
Dynamic supply current is higher due to the gate charge being specifications from 0°C to 85°C. Specifications over the –40°C to 85°C delivered at the switching frequency. See Applications Information. operating temperature range are assured by design, characterization and
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay correlation with statistical process controls. The LTC3727IG-1 is times are measured using 50% levels. guaranteed to meet performance specifications over the –40°C to 85°C
Note 7:
The minimum on-time condition is specified for an inductor operating temperature range. peak-to-peak ripple current ≥ 40% of IMAX (see minimum on-time
Note 3:
TJ is calculated from the ambient temperature TA and power considerations in the Applications Information section). dissipation PD according to the following formulas:
W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency vs Output Current Efficiency vs Output Current Efficiency vs Input Voltage and Mode (Figure 13) (Figure 13) (Figure 13)
100 100 100 Burst Mode V VOUT = 5V 90 IN = 7V OPERATION IOUT = 3A 80 FORCED 90 90 CONTINUOUS 70 MODE VIN = 10V VIN = 15V 60 80 80 50 VIN = 20V CONSTANT 40 70 70 EFFICIENCY (%) FREQUENCY EFFICIENCY (%) EFFICIENCY (%) 30 (BURST DISABLE) 20 60 60 10 VIN = 15V VOUT = 8.5V VOUT = 5V 0 50 50 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 5 15 25 35 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3727 G01 3727 G02 3727 G03 3727fc 4
