Datasheet LTC3830, LTC3830-1 (Analog Devices) - 3

LTC3830/LTC3830-1
ELECTRICAL CHARACTERISTICS The
●
denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC, PVCC1, PVCC2 = 5V, unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
IVCC Supply Current Figure 2, VSHDN = VCC ● 0.7 1.6 mA VSHDN = 0V ● 1 10 µA IPVCC PVCC Supply Current Figure 2, VSHDN = VCC (Note 3) ● 14 20 mA VSHDN = 0V ● 0.1 10 µA fOSC Internal Oscillator Frequency FREQSET Floating ● 160 200 250 kHz VSAWL VCOMP at Minimum Duty Cycle 1.2 V VSAWH VCOMP at Maximum Duty Cycle 2.2 V VCOMPMAX Maximum VCOMP VFB = 0V, PVCC1 = 8V 2.85 V ∆fOSC/∆IFREQSET Frequency Adjustment 10 kHz/µA AV Error Amplifier Open-Loop DC Gain Measured from FB to COMP, ● 46 55 dB SENSE+ and SENSE– Floating, (Note 4) gm Error Amplifier Transconductance Measured from FB to COMP, ● 520 650 780 µmho SENSE+ and SENSE– Floating, (Note 4) ICOMP Error Amplifier Output Sink/Source Current 100 µA IMAX IMAX Sink Current VIMAX = VCC 9 12 15 µA (Note 10) ● 4 12 20 µA IMAX Sink Current Tempco VIMAX = VCC (Note 6) 3300 ppm/°C VIH SHDN Input High Voltage ● 2.4 V VIL SHDN Input Low Voltage ● 0.8 V IIN SHDN Input Current VSHDN = VCC ● 0.1 1 µA ISS Soft-Start Source Current VSS = 0V, VIMAX = 0V, VIFB = VCC ● –8 –12 –16 µA ISSIL Maximum Soft-Start Sink Current VIMAX = VCC, VIFB = 0V, 1.6 mA In Current Limit VSS = VCC (Note 8), PVCC1 = 8V RSENSE SENSE Input Resistance 29.2 kΩ RSENSEFB SENSE to FB Resistance 18 kΩ tr, tf Driver Rise/Fall Time Figure 3, PVCC1 = PVCC2 = 5V (Note 5) ● 80 250 ns tNOV Driver Nonoverlap Time Figure 3, PVCC1 = PVCC2 = 5V (Note 5) ● 25 120 250 ns DCMAX Maximum G1 Duty Cycle Figure 3, VFB = 0V (Note 5), PVCC1 = 8V ● 91 95 %
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 8:
The current limiting amplifier can sink but cannot source current. of a device may be impaired. Under normal (not current limited) operation, the output current will be
Note 2:
All currents into device pins are positive; all currents out of device zero. pins are negative. All voltages are referenced to ground unless otherwise
Note 9:
The LTC3830E/LTC3830-1E are guaranteed to meet performance specified. specifications from 0°C to 70°C. Specifications over the –40°C to 85°C
Note 3:
Supply current in normal operation is dominated by the current operating temperature range are assured by design, characterization and needed to charge and discharge the external FET gates. This will vary with correlation with statistical process controls. the LTC3830 operating frequency, operating voltage and the external FETs
Note 10:
The minimum and maximum limits for IMAX over temperature used. includes the intentional temperature coefficient of 3300ppm/°C. This
Note 4:
The open-loop DC gain and transconductance from the SENSE+ induced temperature coefficient counteracts the typical temperature and SENSE– pins to COMP pin will be (A coefficient of the external power MOSFET on-resistance. This results in a V)(1.265/3.3) and (gm)(1.265/3.3) respectively. relatively flat current limit over temperature for the application.
Note 5:
Rise and fall times are measured using 10% and 90% levels. Duty
Note 11:
This IC includes overtemperature protection that is intended to cycle and nonoverlap times are measured using 50% levels. protect the device during momentary overload conditions. Junction
Note 6:
Guaranteed by design, not subject to test. temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating temperature
Note 7:
PVCC1 must be higher than VCC by at least 2.5V for G1 to operate may impair device reliability. at 95% maximum duty cycle and for the current limit protection circuit to be active. 3830fa 3