Datasheet LTC3882 (Analog Devices) - 5

LTC3882
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at T + + – J = 25°C (Note 2). VCC = 5V, VSENSE0 = VSENSE1 = 1.8V, VSENSE0 = V – SENSE1 = IAVG_GND = GND = 0V, fSYNC = 500kHz (externally driven) unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IC Supply
VCC VCC Voltage Range VDD33 = Internal LDO l 4.5 13.8 V VDD33_EXT VDD33 Voltage Range VCC = VDD33 (Note 6) l 3 3.6 V VUVLO Undervoltage Lockout Threshold VDD33 Rising l 3 V Hysteresis 42 mV IQ IC Operating Current 32 mA tINIT Controller Initialization Time Delay from RESTORE_USER_ALL, MFR_RESET or 35 ms VDD33 > VUVLO Until TON_DELAY Can Begin
VDD33 Linear Regulator
VDD33 Internal VDD33 Voltage VCC ≥ 4.5V l 3.2 3.3 3.4 V IDD33 VDD33 Current Limit VDD33 = 2.8V 85 mA VDD33 = 0V 40 mA
VDD25 Linear Regulator
VDD25 Internal VDD25 Voltage 2.25 2.5 2.75 V IDD25 VDD25 Current Limit 95 mA
PWM Control Loops
VINSNS VIN Sense Voltage Range 3 38 V RVINSNS VINSNS Input Resistance 278 kΩ VOUT_R0 Range 0 Maximum VOUT 5.25 V Range 0 Set Point Accuracy (Note 7) 0.6V ≤ VOUT ≤ 5V ±0.2 % 0.6V ≤ VOUT ≤ 5V l –0.5 0.5 % Range 0 Resolution 12 Bits Range 0 LSB Step Size 1.375 mV VOUT_R1 Range 1 Maximum VOUT 2.65 V Range 1 Set Point Accuracy (Note 7) 0.6V ≤ VOUT ≤ 2.5V ±0.2 % 0.6V ≤ VOUT ≤ 2.5V l –0.5 0.5 % Range 1 Resolution 12 Bits Range 1 LSB Step Size 0.6875 mV I + VSENSE VSENSE Input Current VSENSE = 5.5V 235 µA V – SENSE = 0V –335 µA VLINEREG VCC Line Regulation, No Output Servo 4.5V ≤ VCC ≤ 13.2V (See Test Circuit) –0.02 0.02 %/V AVP AVP Set Accuracy, ∆VOUT AVP = 10%, VOUT_COMMAND = 1.8V, l –118 –96 mV ISENSE Differential Step 3mV (20%) to 12mV (80%) IOUT_OC_WARN_LIMIT at 15mV Resolution 5 Bits LSB Step Size 0.5 % AV(OL) Error Amplifier Open-Loop Voltage Gain 87 dB SR Error Amplifier Slew Rate 9.5 V/µs f0dB Error Amplifier Bandwidth 30 MHz ICOMP Error Amplifier Output Current Sourcing –2.6 mA Sinking 34 mA R + VSFB Resistance Between VSENSE and FB Range 0 l 52 67 83 kΩ Range 1 l 37 49 61 kΩ VISENSE ISENSE Differential Input Range ±70 mV I ± ISENSE ISENSE Input Current 0V ≤ VPIN ≤ 5.5V –1 ±0.1 1 µA IAVG_VOS IAVG Current Sense Offset Referred to ISENSE Inputs ±175 µV l –600 650 µV Rev. C For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Block Diagram Test Circuit Timing Diagram Operation Overview Main Control Loop Power-Up and Initialization Soft-Start Time-Based Output Sequencing Output Ramping Control Voltage-Based Output Sequencing Output Disable Minimum Output Disable Times Output Short Cycle Light Load Current Operation Switching Frequency and Phase PolyPhase Load Sharing Active Voltage Positioning Input Supply Monitoring Output Voltage Sensing and Monitoring Output Current Sensing and Monitoring External and Internal Temperature Sense Resistor Configuration Pins Internal EEPROM with ECC and CRC Fault Detection Input Supply Faults Hardwired PWM Response to VOUT Faults Power Good Indication Hardwired PWM Response to IOUT Faults Hardwired PWM Response to Temperature Faults Hardwired PWM Response to Timing Faults External Faults Fault Handling Status Registers and ALERT Masking Mapping Faults to GPIO Pins Other GPIO Uses Fault Logging Factory Default Operation Serial Interface Serial Bus Addressing Serial Bus Timeout Serial Communication Errors PMBus Command Summary PMBus Commands Data Formats Applications Information Efficiency Considerations PWM Frequency and Inductor Selection Power MOSFET Selection MOSFET Driver Selection Using PWM Protocols CIN Selection COUT Selection Feedback Loop Compensation PCB Layout Considerations Output Current Sensing Output Voltage Sensing Soft-Start and Stop Time-Based Output Sequencing and Ramping Voltage-Based Output Sequencing Using Output Voltage Servo Using AVP PWM Frequency Synchronization PolyPhase Operation and Load Sharing External Temperature Sense Resistor Configuration Pins Internal Regulator Outputs IC Junction Temperature Derating EEPROM Retention at Temperature Configuring Open-Drain Pins PMBus Communication and Command Processing Status and Fault Log Management LTpowerPlay – An Interactive Digital Power GUI Interfacing to the DC1613 Design Example PMBus COMMAND DETAILS Addressing and Write Protect PAGE PAGE_PLUS_WRITE PAGE_PLUS_READ WRITE_PROTECT MFR_ADDRESS MFR_RAIL_ADDRESS General Device Configuration PMBUS_REVISION CAPABILITY On, Off and Margin Control ON_OFF_CONFIG MFR_CONFIG_ALL_LTC3882 OPERATION MFR_RESET PWM Configuration FREQUENCY_SWITCH MFR_PWM_CONFIG_LTC3882 MFR_CHAN_CONFIG_LTC3882 MFR_PWM_MODE_LTC3882 Input Voltage and Limits VIN_ON VIN_OFF VIN_OV_FAULT_LIMIT VIN_UV_WARN_LIMIT Output Voltage and Limits VOUT_MODE VOUT_COMMAND MFR_VOUT_MAX VOUT_MAX MFR_VOUT_AVP VOUT_MARGIN_HIGH VOUT_MARGIN_LOW VOUT_OV_FAULT_LIMIT VOUT_OV_WARN_LIMIT VOUT_UV_WARN_LIMIT VOUT_UV_FAULT_LIMIT Output Current and Limits IOUT_CAL_GAIN MFR_IOUT_CAL_GAIN_TC IOUT_OC_FAULT_LIMIT IOUT_OC_WARN_LIMIT Output Timing, Delays, and Ramping MFR_RESTART_DELAY TON_DELAY TON_RISE TON_MAX_FAULT_LIMIT VOUT_TRANSITION_RATE TOFF_DELAY TOFF_FALL TOFF_MAX_WARN_LIMIT External Temperature and Limits MFR_TEMP_1_GAIN MFR_TEMP_1_OFFSET OT_FAULT_LIMIT OT_WARN_LIMIT Status Reporting STATUS_BYTE UT_FAULT_LIMIT STATUS_WORD STATUS_VOUT STATUS_IOUT STATUS_INPUT STATUS_TEMPERATURE STATUS_CML STATUS_MFR_SPECIFIC MFR_PADS_LTC3882 MFR_COMMON MFR_INFO CLEAR_FAULTS Telemetry READ_VIN MFR_VIN_PEAK READ_VOUT MFR_VOUT_PEAK READ_IOUT MFR_IOUT_PEAK READ_POUT READ_TEMPERATURE_1 MFR_TEMPERATURE_1_PEAK READ_TEMPERATURE_2 MFR_TEMPERATURE_2_PEAK READ_DUTY_CYCLE READ_FREQUENCY MFR_CLEAR_PEAKS Fault Response and Communication VIN_OV_FAULT_RESPONSE VOUT_OV_FAULT_RESPONSE VOUT_UV_FAULT_RESPONSE IOUT_OC_FAULT_RESPONSE OT_FAULT_RESPONSE UT_FAULT_RESPONSE MFR_OT_FAULT_RESPONSE TON_MAX_FAULT_RESPONSE MFR_RETRY_DELAY SMBALERT_MASK MFR_GPIO_PROPAGATE_LTC3882 MFR_GPIO_RESPONSE MFR_FAULT_LOG Fault Log Operation MFR_FAULT_LOG_CLEAR EEPROM User Access STORE_USER_ALL RESTORE_USER_ALL MFR_COMPARE_USER_ALL MFR_FAULT_LOG_STORE MFR_EE_xxxx USER_DATA_0x Unit Identification MFR_ID MFR_MODEL MFR_SERIAL MFR_SPECIAL_ID Typical Applications Package Description Revision History Typical Application Related Parts