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LTC3830EGN Datasheet(PDF) 3 Page - Linear Technology |
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LTC3830EGN Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  3 LTC3830/LTC3830-1 sn3830 3830fs SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IVCC Supply Current Figure 2, VSHDN = VCC q 0.7 1.6 mA VSHDN = 0V q 110 µA IPVCC PVCC Supply Current Figure 2, VSHDN = VCC (Note 3) q 14 20 mA VSHDN = 0V q 0.1 10 µA fOSC Internal Oscillator Frequency FREQSET Floating q 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, q 46 55 dB SENSE+ and SENSE– Floating, (Note 4) gm Error Amplifier Transconductance Measured from FB to COMP, q 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 912 15 µA (Note 10) q 412 20 µA IMAX Sink Current Tempco VIMAX = VCC (Note 6) 3300 ppm/ °C VIH SHDN Input High Voltage q 2.4 V VIL SHDN Input Low Voltage q 0.8 V IIN SHDN Input Current VSHDN = VCC q 0.1 1 µA ISS Soft-Start Source Current VSS = 0V, VIMAX = 0V, VIFB = VCC q –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 k Ω RSENSEFB SENSE to FB Resistance 18 k Ω tr, tf Driver Rise/Fall Time Figure 2, PVCC1 = PVCC2 = 5V (Note 5) q 80 250 ns tNOV Driver Nonoverlap Time Figure 2, PVCC1 = PVCC2 = 5V (Note 5) q 25 120 250 ns DCMAX Maximum G1 Duty Cycle Figure 2, VFB = 0V (Note 5), PVCC1 = 8V q 91 95 % The q 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) ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to ground unless otherwise specified. Note 3: Supply current in normal operation is dominated by the current needed to charge and discharge the external FET gates. This will vary with the LTC3830 operating frequency, operating voltage and the external FETs used. Note 4: The open-loop DC gain and transconductance from the SENSE+ and SENSE– pins to COMP pin will be (AV)(1.265/3.3) and (gm)(1.265/3.3) respectively. Note 5: Rise and fall times are measured using 10% and 90% levels. Duty cycle and nonoverlap times are measured using 50% levels. Note 6: Guaranteed by design, not subject to test. Note 7: PVCC1 must be higher than VCC by at least 2.5V for the current limit protection circuit to be active. Note 8: The current limiting amplifier can sink but cannot source current. Under normal (not current limited) operation, the output current will be zero. Note 9: The LTC3830E/LTC3830-1E are guaranteed to meet performance specifications from 0 °C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 10: The minimum and maximum limits for IMAX over temperature includes the intentional temperature coefficient of 3300ppm/ °C. This induced temperature coefficient counteracts the typical temperature coefficient of the external power MOSFET on-resistance. This results in a relatively flat current limit over temperature for the application. |
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