Datasheet LTC3703-5 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 60V Synchronous Switching Regulator Controller |
| Pages / Page | 32 / 3 — ELECTRICAL CHARACTERISTICS The |
| File Format / Size | PDF / 386 Kb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The
Model Line for this Datasheet
Text Version of Document
LTC3703-5
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC = DRVCC = VBOOST = VIN = 5V, VMODE/SYNC = VINV = VSW = BGRTN = 0V, RUN/SS = IMAX = open, RSET = 25k, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
VFB Feedback Voltage (Note 4) 0.792 0.800 0.808 V ● 0.788 0.812 V ∆VFB, LINE Feedback Voltage Line Regulation 5V < VCC < 15V (Note 4) ● 0.007 0.05 %/V ∆VFB, LOAD Feedback Voltage Load Regulation 1V < VCOMP < 2V (Note 4) ● 0.01 0.1 % VMODE/SYNC MODE/SYNC Threshold MODE/SYNC Rising 0.75 0.8 0.87 V ∆VMODE/SYNC MODE/SYNC Hysteresis 20 mV IMODE/SYNC MODE/SYNC Current 0 ≤ VMODE/SYNC ≤ 15V 0 1 µA VINV Invert Threshold 1 1.5 2 V IINV Invert Current 0 ≤ VINV ≤ 15V 0 1 µA IVIN VIN Sense Input Current VIN = 60V 80 130 µA RUN/SS = 0V, VIN = 10V 0 1 µA IMAX IMAX Source Current VIMAX = 0V 10.5 12 13.5 µA VOS, IMAX VIMAX Offset Voltage |VSW| – VIMAX at IRUN/SS = 0µA – 25 10 55 mV VRUN/SS Shutdown Threshold 0.7 0.9 1.2 V IRUN/SS RUN/SS Source Current RUN/SS = 0V 2.3 3.8 5.3 µA Maximum RUN/SS Sink Current |VSW| – VIMAX > 100mV 9 17 25 µA VUV Undervoltage Lockout VCC Rising ● 3.4 3.7 4.1 V VCC Falling ● 2.8 3.1 3.4 V Hysteresis ● 0.45 0.65 0.85 V
Oscillator
fOSC Oscillator Frequency RSET = 25kΩ 270 300 330 kHz fSYNC External Sync Frequency Range 100 600 kHz tON, MIN Minimum On-Time 200 ns DCMAX Maximum Duty Cycle f < 200kHz 89 93 96 %
Driver
IBG, PEAK BG Driver Peak Source Current 0.75 1 A RBG, SINK BG Driver Pull-Down RDS, ON (Note 8) 1.2 1.8 Ω ITG, PEAK TG Driver Peak Source Current 0.75 1 A RTG, SINK TG Driver Pull-Down RDS, ON (Note 8) 1.2 1.8 Ω
Feedback Amplifier
AVOL Op Amp DC Open Loop Gain (Note 4) 74 85 dB fU Op Amp Unity Gain Crossover Frequency (Note 6) 25 MHz IFB FB Input Current 0 ≤ VFB ≤ 3V 0 1 µA ICOMP COMP Sink/Source Current ±5 ±10 mA
Note 1
: Absolute Maximum Ratings are those values beyond which the life reference voltage with the COMP pin forced to a voltage between 1V and 2V. of a device may be impaired.
Note 5:
The dynamic input supply current is higher due to the power
Note 2
: The LTC3703-5 is guaranteed to meet performance specifications MOSFET gate charging being delivered at the switching frequency from 0°C to 70°C. Specifications over the –40°C to 85°C operating (QG • fOSC). temperature range are assured by design, characterization and correlation
Note 6
: Guaranteed by design. Not subject to test. with statistical process controls. The LTC3703I-5 is guaranteed over the full
Note 7
: This IC includes overtemperature protection that is intended to –40°C to 125°C operating junction temperature range. protect the device during momentary overload conditions. Junction
Note 3:
TJ is calculated from the ambient temperature TA and power temperature will exceed 125°C when overtemperature protection is active. dissipation PD according to the following formula: Continuous operation above the specified maximum operating junction LTC3703-5: TJ = TA + (PD • 100 °C/W) G Package temperature may impair device reliability.
Note 4
: The LTC3703-5 is tested in a feedback loop that servos VFB to the
Note 8
: RDS(ON) guaranteed by correlation to wafer level measurement. 37035fa 3
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC = DRVCC = VBOOST = VIN = 5V, VMODE/SYNC = VINV = VSW = BGRTN = 0V, RUN/SS = IMAX = open, RSET = 25k, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loop
VFB Feedback Voltage (Note 4) 0.792 0.800 0.808 V ● 0.788 0.812 V ∆VFB, LINE Feedback Voltage Line Regulation 5V < VCC < 15V (Note 4) ● 0.007 0.05 %/V ∆VFB, LOAD Feedback Voltage Load Regulation 1V < VCOMP < 2V (Note 4) ● 0.01 0.1 % VMODE/SYNC MODE/SYNC Threshold MODE/SYNC Rising 0.75 0.8 0.87 V ∆VMODE/SYNC MODE/SYNC Hysteresis 20 mV IMODE/SYNC MODE/SYNC Current 0 ≤ VMODE/SYNC ≤ 15V 0 1 µA VINV Invert Threshold 1 1.5 2 V IINV Invert Current 0 ≤ VINV ≤ 15V 0 1 µA IVIN VIN Sense Input Current VIN = 60V 80 130 µA RUN/SS = 0V, VIN = 10V 0 1 µA IMAX IMAX Source Current VIMAX = 0V 10.5 12 13.5 µA VOS, IMAX VIMAX Offset Voltage |VSW| – VIMAX at IRUN/SS = 0µA – 25 10 55 mV VRUN/SS Shutdown Threshold 0.7 0.9 1.2 V IRUN/SS RUN/SS Source Current RUN/SS = 0V 2.3 3.8 5.3 µA Maximum RUN/SS Sink Current |VSW| – VIMAX > 100mV 9 17 25 µA VUV Undervoltage Lockout VCC Rising ● 3.4 3.7 4.1 V VCC Falling ● 2.8 3.1 3.4 V Hysteresis ● 0.45 0.65 0.85 V
Oscillator
fOSC Oscillator Frequency RSET = 25kΩ 270 300 330 kHz fSYNC External Sync Frequency Range 100 600 kHz tON, MIN Minimum On-Time 200 ns DCMAX Maximum Duty Cycle f < 200kHz 89 93 96 %
Driver
IBG, PEAK BG Driver Peak Source Current 0.75 1 A RBG, SINK BG Driver Pull-Down RDS, ON (Note 8) 1.2 1.8 Ω ITG, PEAK TG Driver Peak Source Current 0.75 1 A RTG, SINK TG Driver Pull-Down RDS, ON (Note 8) 1.2 1.8 Ω
Feedback Amplifier
AVOL Op Amp DC Open Loop Gain (Note 4) 74 85 dB fU Op Amp Unity Gain Crossover Frequency (Note 6) 25 MHz IFB FB Input Current 0 ≤ VFB ≤ 3V 0 1 µA ICOMP COMP Sink/Source Current ±5 ±10 mA
Note 1
: Absolute Maximum Ratings are those values beyond which the life reference voltage with the COMP pin forced to a voltage between 1V and 2V. of a device may be impaired.
Note 5:
The dynamic input supply current is higher due to the power
Note 2
: The LTC3703-5 is guaranteed to meet performance specifications MOSFET gate charging being delivered at the switching frequency from 0°C to 70°C. Specifications over the –40°C to 85°C operating (QG • fOSC). temperature range are assured by design, characterization and correlation
Note 6
: Guaranteed by design. Not subject to test. with statistical process controls. The LTC3703I-5 is guaranteed over the full
Note 7
: This IC includes overtemperature protection that is intended to –40°C to 125°C operating junction temperature range. protect the device during momentary overload conditions. Junction
Note 3:
TJ is calculated from the ambient temperature TA and power temperature will exceed 125°C when overtemperature protection is active. dissipation PD according to the following formula: Continuous operation above the specified maximum operating junction LTC3703-5: TJ = TA + (PD • 100 °C/W) G Package temperature may impair device reliability.
Note 4
: The LTC3703-5 is tested in a feedback loop that servos VFB to the
Note 8
: RDS(ON) guaranteed by correlation to wafer level measurement. 37035fa 3
