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LTC3889 Datasheet(PDF) 8 Page - Analog Devices |
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LTC3889 Datasheet(HTML) 8 Page - Analog Devices |
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8 / 118 page  LTC3888/LTC3888-1/ LTC3888-2 8 Rev. B For more information www.analog.com SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VLOADREG Load Regulation ΔITHn = ±600mV (Note 10) –0.1 0.1 % gm Resolution Error Amplifier gm(MAX) Error Amplifier gm(MIN) LSB Step Size ITH = 1.35V 3 5.76 1 0.68 Bits mmho mmho mmho RITH Resolution (nonlinear) Compensation Resistance RTH(MAX) Compensation Resistance RTH(MIN) 5 62 1 Bits kΩ kΩ ISHARE_TOL Phase-to-Phase Output Current Sharing Accuracy ISENSEn – IREF ≥ 150mV l –6.5 ±3 6.5 % % IISENSE ISENSEn Input Current 1.5V ≤ ISENSEn ≤ 1.9V l –1 3 µA VIREF Current Monitor Reference Output Voltage IIREF = 3mA (Note 6) 1.52 1.68 V IIREF IREF Output Current Source, IREF ≥ 1.52V Sink, IREF ≤ 1.68V 10 –500 µA mA fSYNC SYNC Output Frequency Accuracy l –7.5 7.5 % tON(MIN) Minimum On-Time MFR_PWM_MODE_LTC3888-1[3] = 1 MFR_PWM_MODE_LTC3888-1[3] = 0 l 30 21 60 ns ns Difference Amplifiers (LTC3888-1) DA_VOS Input Offset Voltage Referred to VSENSE+ l –16 16 mV DA_GE Gain Error Nominal Gain at DAOUT: 1.00 (Note 10) l –4 4 % DA_BW Unity-Gain Crossover Frequency RL = 40kΩ (Note 16) 25 MHz DA_IOUT Maximum Output Current Sourced, DAOUT = 3.45V l 325 µA DA_VMAX Maximum Output Voltage 3.45 V Input Voltage Supervisor NVON Input ON/OFF Resolution LSB Step Size 9 54.7 Bits mV VON_FS Full-Scale ON Threshold 28 V VON_TOL Input ON/OFF Threshold Accuracy VIN_ON ≥ 6.5V l –2 2 % Output Voltage Supervisors VUVOV_TOL Accuracy (Note 10) 0.5V ≤ VOUT < 1.0V (UV and OV) 1.0V ≤ VOUT ≤ 3.6V (UV and OV) l l –3 –2 3 2 % % Output Current Supervisors NILIMIT ISENSE Overcurrent Limit Resolution 7 Bits VOC_FS Full-Scale Threshold ISENSEn – IREF 500 mV VOC_TOL Accuracy ISENSEn – IREF ≥ 100mV l –6.5 6.5 % Gate Drive Voltage Supervisors IVDR_MON VDR_MON Input Current VDR_MON = 1.22V l –1 1 µA VDR_UV UV Threshold l 1.194 1.243 V ADC Readback Telemetry (Note 11) NVIN VIN Readback Resolution (Note 12) 10 Bits VIN_TUE VIN Total Unadjusted Readback Error VIN ≥ 4.5V l 1 % ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Notes 2, 8). VIN = 12V, VSENSEn+ = 1V, VSENSEn– = GND = 0V, fSYNC = 500kHz (externally driven) unless otherwise specified. |
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