Datasheet LTC3707 (Analog Devices) - 4

LTC3707
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
fHIGH Highest Frequency VFREQSET = 2.4V 280 310 360 kHz IFREQSET FREQSET Input Current VFREQSET = 0V –2 –1 μA
3.3V Linear Regulator
V3.3OUT 3.3V Regulator Output Voltage No Load l 3.20 3.35 3.45 V V3.3IL 3.3V Regulator Load Regulation I3.3 = 0 to 10mA 0.5 2 % V3.3VL 3.3V Regulator Line Regulation 6V < VIN < 30V 0.05 0.2 %
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 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 LTC3707 is tested in a feedback loop that servos VITH1, 2 to a may cause permanent damage to the device. Exposure to any Absolute 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 LTC3707E is guaranteed to meet performance specifi cations
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay from 0°C to 85°C. Specifi cations over the – 40°C to 85°C operating times are measured using 50% levels. temperature range are assured by design, characterization and correlation
Note 7:
The IC minimum on-time is tested under an ideal condition with statistical process controls. The LTC3707I is guaranteed to meet without external power FETs. It can be different when the IC is working in performance specifi cations over the full – 40°C to 85°C operating an actual circuit. See Minimum On-Time Considerations in the Application temperature range. Information section.
Note 3:
TJ is calculated from the ambient temperature TA and power
Note 8:
VFREQSET pin internally tied to a 1.19V reference through a dissipation PD according to the following formula: large resistance. LTC3707EGN = TJ = TA + (PD • 85°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 VIN = 15V V 90 OPERATION IN = 7V VOUT = 5V 80 90 90 70 FORCED VIN = 10V CONTINUOUS VIN = 15V 60 80 80 MODE (PWM) 50 VIN = 20V 40 CONSTANT 70 70 EFFICIENCY (%) FREQUENCY EFFICIENCY (%) EFFICIENCY (%) 30 (BURST DISABLE) 20 60 60 V 10 V OUT = 5V IN = 15V I V OUT = 3A OUT = 5V 0 50 50 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 5 15 25 30 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3707 G01 3707 G02 3707 G03 3707fb 4