Datasheet LT3074 (Analog Devices) - 8

Data Sheet LT3074
(All typical specifications are at TJ (junction temperature). = 25°C and all min. and max. specifications are across the entire operating temperature range, unless otherwise noted. COUT = 22µF, CSETCAP = 4.7µF, CBIASAF = 2.2µF, and CBIASDF = 0.47µF, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS/COMMENTS MIN TYP MAX UNITS
Temperature Readback tREFRESH_TEMP Refresh Rate TJ = 25°C 46.08 msec VIH Input High Voltage 1.35 VIL Input Low Voltage 0.8 V Digital Inputs (SCL, SDA) VHYST Input Hysteresis TJ = 25°C 0.235 CPIN Input Capacitance 10 pF Open Drain Outputs VOL Output Low Voltage, ISINK = 6mA 0.4 V Output Leakage Current, 0V ≤ V (SCL, SDA, ALERT ) I PIN ≤ LEAK 5 µA 5.5V Serial Bus Operating f Frequency SCL 10 400 kHz Bus Free Time Between t Start and Stop BUF 1.3 µsec Hold Time After Start Condition (after this t period, the first clock is HD(STA) 0.6 µsec generated). Repeated Start t Condition Setup Time SU(STA) 0.6 10000 µsec Stop Condition Setup t Time SU(STO) 0.6 µsec Receiving Data 0 Data Hold Time tHD(DAT) µsec Sending Data 0.3 0.9 Data Setup Time tSU(DAT) 0.1 µsec Stuck PMBus Timer tTIMEOUT_SMB 35 msec Serial Clock Low Period tLOW 1.3 10000 µsec Serial Clock High Period tHIGH 0.6 µsec .1 To maintain proper performance and regulation, the BIAS voltage must satisfy the following conditions: 2.375V ≤ VBIAS ≤ 5.5V and VBIAS ≥ (VOUT + 1.2V). 2 Dropout voltage, VDO, is the minimum input-to-output voltage differential at a specified output current. In dropout, the output voltage equals VIN – VDO. 3 Operating conditions are limited by maximum junction temperature. The regulated output voltage specification does not apply for all possible combinations of input voltage and output current. When operating at maximum output current, limit the input voltage range to VIN ≤ VOUT + 600mV. 4 The temperature reported represents the average temperature of the LT3074’s power device. Due to power dissipation, temperature gradients, and thermal time constants across the die, the reported temperature
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Rev 0. 8 of 62 Document Outline Features Applications General Description Simplified Application Diagram Revision History Specifications Absolute Maximum Ratings Thermal Resistance Electrostatic Discharge (ESD) ESD Ratings ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Functional Diagrams Applications Information Output Voltage Output Sensing Stability and Output Capacitance High Vibration Environments Stability and Input Capacitance PSRR and Input Capacitance Filtering High Frequency Spikes Output Noise SETCAP Pin Capacitance: Noise, PSRR, Transient Response, and Soft-Start Fast Start Output Voltage Margining BIAS/BIASAF/BIASDF Pin Requirements BIAS Undervoltage Lockout EN/UV Function (Turning the Part ON and OFF) Power Good Indicator Programmable Power Good Current Monitor and Programmable Current Limit Output Overshoot Recovery and Active Discharge Direct Paralleling for Higher Output Current PCB Layout Considerations High Efficiency Linear Regulator – Input-to-Output Voltage Control Thermal Considerations Calculating Junction Temperature Protection Features Serial Bus Addressing Telemetry Readback Fault Reporting and the ALERT pin Bus Timeout TTIMEOUT TLOW:SEXT TLOW:MEXT PMBus Command Details PAGE OPERATION ON_OFF_CONFIG CLEAR_FAULTS WRITE_PROTECT CAPABILITY VOUT_MODE VOUT_OV_WARN_LIMIT VOUT_UV_WARN_LIMIT IOUT_OC_FAULT_LIMIT IOUT_OC_FAULT_RESPONSE OT_WARN_LIMIT VIN_OV_WARN_LIMIT VIN_UV_WARN_LIMIT STATUS_BYTE STATUS_WORD STATUS_VOUT STATUS_IOUT STATUS_INPUT STATUS_TEMPERATURE STATUS_CML STATUS_MFR_SPECIFIC READ_VIN READ_VOUT READ_IOUT READ_TEMPERATURE_1 PMBUS_REVISION IC_DEVICE_ID IC_DEVICE_REV MFR_MARGIN MFR_READ_VBIAS MFR_BIAS_OV_WARN_LIMIT MFR_BIAS_UV_WARN_LIMIT MFR_IOUT_MIN_WARN_LIMIT MFR_SPECIAL_ID MFR_DEFAULT_CONFIG MFR_RAIL_ADDRESS MFR_RESET Typical Application Circuits Outline Dimensions Ordering Guide Evaluation Boards Related Parts