Datasheet LTC3727A-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 specifi cations which apply … |
| File Format / Size | PDF / 341 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifi cations which apply over the full operating
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LTC3727A-1
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 = 15V, VRUN/SS1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 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 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
Note 4:
The LTC3727A-1 is tested in a feedback loop that servos VITH1, 2 to may cause permanent damage to the device. Exposure to any Absolute a specifi ed voltage and measures the resultant VOSENSE1, 2. Maximum Rating condition for extended periods may affect device
Note 5:
Dynamic supply current is higher due to the gate charge being reliability and lifetime. delivered at the switching frequency. See Applications Information.
Note 2:
The LTC3727AE-1 is guaranteed to meet performance
Note 6:
Rise and fall times are measured using 10% and 90% levels. specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C Delay times are measured using 50% levels. operating temperature range are assured by design, characterization
Note 7:
The minimum on-time condition is specifi ed for an inductor and correlation with statistical process controls. The LTC3727AI-1 is peak-to-peak ripple current ≥40% of IMAX (see minimum on-time guaranteed to meet performance specifi cations over the full –40°C to considerations in the Applications Information section). 85°C operating temperature range.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC3727AG-1: TJ = TA + (PD • 95 °C/W)
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Output Current Effi ciency vs Output Current Effi ciency 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 3727a1fa 4
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 = 15V, VRUN/SS1, 2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 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 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
Note 4:
The LTC3727A-1 is tested in a feedback loop that servos VITH1, 2 to may cause permanent damage to the device. Exposure to any Absolute a specifi ed voltage and measures the resultant VOSENSE1, 2. Maximum Rating condition for extended periods may affect device
Note 5:
Dynamic supply current is higher due to the gate charge being reliability and lifetime. delivered at the switching frequency. See Applications Information.
Note 2:
The LTC3727AE-1 is guaranteed to meet performance
Note 6:
Rise and fall times are measured using 10% and 90% levels. specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C Delay times are measured using 50% levels. operating temperature range are assured by design, characterization
Note 7:
The minimum on-time condition is specifi ed for an inductor and correlation with statistical process controls. The LTC3727AI-1 is peak-to-peak ripple current ≥40% of IMAX (see minimum on-time guaranteed to meet performance specifi cations over the full –40°C to considerations in the Applications Information section). 85°C operating temperature range.
Note 3:
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC3727AG-1: TJ = TA + (PD • 95 °C/W)
TYPICAL PERFORMANCE CHARACTERISTICS Effi ciency vs Output Current Effi ciency vs Output Current Effi ciency 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 3727a1fa 4
