Datasheet LT8491 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | High Voltage Buck-Boost Battery Charge Controller with Maximum Power Point Tracking (MPPT) and I2C |
| Pages / Page | 82 / 6 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| File Format / Size | PDF / 2.1 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
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LT8491
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VDD = AVDD = 3.3V, SHDN = 3V unless otherwise noted. (Note 3) PARAMETER CONDITIONS MIN TYP MAX UNITS Switching Regulator Oscillator (OSC1)
Switch Frequency Range Syncing or Free Running 100 400 kHz Switching Frequency, fOSC RT = 365kΩ l 102 120 142 kHz RT = 215kΩ l 170 202 235 kHz RT = 124kΩ l 310 350 400 kHz SYNC High Level for Synchronization l 1.3 V SYNC Low Level for Synchronization l 0.5 V SYNC Clock Pulse Duty Cycle VSYNC = 0V to 2V 20 80 % Recommended Min SYNC Ratio, fSYNC/fOSC ¾ f/f CLKOUT Output Voltage HIGH 1mA Out of CLKOUT Pin 2.3 2.45 2.55 V CLKOUT Output Voltage LOW 1mA into CKLKOUT Pin 25 100 mV CLKOUT Duty Cycle TJ = –40°C 22.7 % TJ = 25°C 44.1 % TJ = 125°C 77 %
Charging Control
STATUS, FBOW, FBIW, SWENO, IOW, ECON Output IOL = 5mA l 0.22 0.5 V Low Voltage STATUS, FBOW, FBIW, SWENO, IOW, ECON Output IOH = –5mA l 2.7 3 V High Voltage Power Supply Mode Detection Threshold (Note 6) VINR Pin Falling l 155 174 mV Power Supply Mode Detection Threshold Hysteresis 29 mV (Note 6) Minimum VINR Voltage for Startup (Note 6) Not in Power Supply Mode Low Power Mode Enabled l 380 395 410 mV Low Power Mode Disabled l 213 225 237 mV High Charging Current Threshold on IOR (Note 6) IOR Rising → ECON Rising l 168 195 224 mV Low Charging Current Threshold on IOR (Note 6) IOR Falling → ECON Falling l 95 122 150 mV Minimum TEMPSENSE % of AVDD to Detect Battery l 94.5 96 97.5 % Disconnected (Note 6) VCSPOUT – VCSNOUT Threshold for C/5 Detection VCSxOUT Common Mode = 5.0V, RTOTAL from 9 10 11 mV (Note 6) IMON_OUT to Ground = 24.3kΩ VCSPOUT – VCSNOUT Threshold for C/10 Detection VCSxOUT Common Mode = 5.0V, IOR Falling, RTOTAL 4.25 5 5.75 mV (Note 6) from IMON_OUT to Ground = 24.3kΩ FBIW, FBOW PWM Frequency (OSC2) 31.25 kHz FBIW, FBOW PWM Resolution 8 bits Internal A/D Resolution 10 bits Rev. 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Overview I2C Serial Interface I2C: START and STOP Conditions I2C: ACKnowledge I2C: Chip Addressing I2C: Clock Stretching I2C: Data Transfer Transactions I2C: Powering the Interface I2C Data Data: Memory Regions Data: Bytes, Words and Long Words Data: Min/Max Register Values Data: Access Permissions Startup Sequence Battery Charging Algorithm Stage 0: Trickle Charging Stage 1: Full Constant Current Stage 2: Constant Voltage Stage 3: (Optional) Reduced Constant Voltage Done Charging Charging Faults Maximum Power Point Tracking Telemetry Operation Telemetry: Configuration Settings Telemetry: Acquisition CRC Operation EEPROM Operation EEPROM: Startup EEPROM: Reading EEPROM: Writing I2C Register Map I2C Register Descriptions Telemetry Registers TELE_TBAT TELE_POUT TELE_PIN TELE_EFF TELE_IOUT TELE_IIN TELE_VBAT TELE_VIN TELE_VINR Status Registers STAT_CHARGER STAT_SYSTEM STAT_SUPPLY STAT_TSx_REMAIN STAT_CHRG_FAULTS STAT_VERSION STAT_BOOT_CRC STAT_CFG_CRC Control The EEPROM CTRL_WRT_TO_BOOT CTRL_EE_WRT_EN Control Other Functions CTRL_HALT_STARTUP CTRL_CHRG_EN CTRL_RESTART_CHIP CTRL_RESET_FLAG CTRL_UPDATE_TELEM Configure The Telemetry CFG_RSENSE1 CFG_RIMON_OUT CFG_RSENSE2 CFG_RDACO CFG_RFBOUT1 CFG_RFBOUT2 CFG_RDACI CFG_RFBIN2 CFG_RFBIN1 Configure Initial Charger Enable CFG_INIT_CHRG_EN Configure VBAT for Stages 0, 1 and 3 CFG_VS3_25C CFG_UV_S0 CFG_S0_UV CFG_S0_S1 CFG_S1_S0 Configure Temperature Fault Limits CFG_TBAT_MIN CFG_TBAT_MAX Configure Stage Timeout Limits CFG_TMR_S0 CFG_TMR_S1 CFG_TMR_S2 CFG_TMR_S3 Configure Automatic Restart CFG_RSTRT_IN_FLT CFG_RSTRT_IN_DONEA CFG_RSTRT_IN_DONEB CFG_RSTRT_IN_S3 Configure Charge Termination CFG_TERMINATE Configure Misc. CFG_SCAN_RATE_LP CFG_SCAN_RATE CFG_CHRG_MISC Configure Temperature Compensation CFG_TC3, CFG_TC2, CFG_TC1 Configure User Code CFG_USER_CODE Manufacturer Data MFR_DATA1 MFR_DATA2 MFR_DATA3 Applications Information Hardware Configuration HW Config: Input Voltage Sensing and Modulation HW Config: VINR Pin Connections HW Config: Solar Panel Powered Charging HW Config: DC Supply Powered Charging HW Config: VBAT in Stage 2 (VS2) HW Config: Input Current Sense and Limit HW Config: Output Current Sense and Limit HW Config: Current Sense Filtering HW Config: Battery Temperature and Disconnect Sensing HW Config: SHDN Pin Connections HW Config: MODE Pin – Current Conduction Mode HW Config: Driving an LED with the STATUS Pin HW Config: I2C Chip Address Pin In-Situ Battery Charging Hot-Plugging Considerations STATUS Indicator Pin Lithium-Ion Battery Charging Lead-Acid Battery Charging Optional Features Optional: Low Power Mode Optional: Output Feedback Resistor Disconnect Optional: EXTVCC Disconnect Optional: Remote Battery Voltage Sensing Optional: DC Supply Detection Circuit Board Layout Considerations Design Example Typical Applications Package Description Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VDD = AVDD = 3.3V, SHDN = 3V unless otherwise noted. (Note 3) PARAMETER CONDITIONS MIN TYP MAX UNITS Switching Regulator Oscillator (OSC1)
Switch Frequency Range Syncing or Free Running 100 400 kHz Switching Frequency, fOSC RT = 365kΩ l 102 120 142 kHz RT = 215kΩ l 170 202 235 kHz RT = 124kΩ l 310 350 400 kHz SYNC High Level for Synchronization l 1.3 V SYNC Low Level for Synchronization l 0.5 V SYNC Clock Pulse Duty Cycle VSYNC = 0V to 2V 20 80 % Recommended Min SYNC Ratio, fSYNC/fOSC ¾ f/f CLKOUT Output Voltage HIGH 1mA Out of CLKOUT Pin 2.3 2.45 2.55 V CLKOUT Output Voltage LOW 1mA into CKLKOUT Pin 25 100 mV CLKOUT Duty Cycle TJ = –40°C 22.7 % TJ = 25°C 44.1 % TJ = 125°C 77 %
Charging Control
STATUS, FBOW, FBIW, SWENO, IOW, ECON Output IOL = 5mA l 0.22 0.5 V Low Voltage STATUS, FBOW, FBIW, SWENO, IOW, ECON Output IOH = –5mA l 2.7 3 V High Voltage Power Supply Mode Detection Threshold (Note 6) VINR Pin Falling l 155 174 mV Power Supply Mode Detection Threshold Hysteresis 29 mV (Note 6) Minimum VINR Voltage for Startup (Note 6) Not in Power Supply Mode Low Power Mode Enabled l 380 395 410 mV Low Power Mode Disabled l 213 225 237 mV High Charging Current Threshold on IOR (Note 6) IOR Rising → ECON Rising l 168 195 224 mV Low Charging Current Threshold on IOR (Note 6) IOR Falling → ECON Falling l 95 122 150 mV Minimum TEMPSENSE % of AVDD to Detect Battery l 94.5 96 97.5 % Disconnected (Note 6) VCSPOUT – VCSNOUT Threshold for C/5 Detection VCSxOUT Common Mode = 5.0V, RTOTAL from 9 10 11 mV (Note 6) IMON_OUT to Ground = 24.3kΩ VCSPOUT – VCSNOUT Threshold for C/10 Detection VCSxOUT Common Mode = 5.0V, IOR Falling, RTOTAL 4.25 5 5.75 mV (Note 6) from IMON_OUT to Ground = 24.3kΩ FBIW, FBOW PWM Frequency (OSC2) 31.25 kHz FBIW, FBOW PWM Resolution 8 bits Internal A/D Resolution 10 bits Rev. 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Overview I2C Serial Interface I2C: START and STOP Conditions I2C: ACKnowledge I2C: Chip Addressing I2C: Clock Stretching I2C: Data Transfer Transactions I2C: Powering the Interface I2C Data Data: Memory Regions Data: Bytes, Words and Long Words Data: Min/Max Register Values Data: Access Permissions Startup Sequence Battery Charging Algorithm Stage 0: Trickle Charging Stage 1: Full Constant Current Stage 2: Constant Voltage Stage 3: (Optional) Reduced Constant Voltage Done Charging Charging Faults Maximum Power Point Tracking Telemetry Operation Telemetry: Configuration Settings Telemetry: Acquisition CRC Operation EEPROM Operation EEPROM: Startup EEPROM: Reading EEPROM: Writing I2C Register Map I2C Register Descriptions Telemetry Registers TELE_TBAT TELE_POUT TELE_PIN TELE_EFF TELE_IOUT TELE_IIN TELE_VBAT TELE_VIN TELE_VINR Status Registers STAT_CHARGER STAT_SYSTEM STAT_SUPPLY STAT_TSx_REMAIN STAT_CHRG_FAULTS STAT_VERSION STAT_BOOT_CRC STAT_CFG_CRC Control The EEPROM CTRL_WRT_TO_BOOT CTRL_EE_WRT_EN Control Other Functions CTRL_HALT_STARTUP CTRL_CHRG_EN CTRL_RESTART_CHIP CTRL_RESET_FLAG CTRL_UPDATE_TELEM Configure The Telemetry CFG_RSENSE1 CFG_RIMON_OUT CFG_RSENSE2 CFG_RDACO CFG_RFBOUT1 CFG_RFBOUT2 CFG_RDACI CFG_RFBIN2 CFG_RFBIN1 Configure Initial Charger Enable CFG_INIT_CHRG_EN Configure VBAT for Stages 0, 1 and 3 CFG_VS3_25C CFG_UV_S0 CFG_S0_UV CFG_S0_S1 CFG_S1_S0 Configure Temperature Fault Limits CFG_TBAT_MIN CFG_TBAT_MAX Configure Stage Timeout Limits CFG_TMR_S0 CFG_TMR_S1 CFG_TMR_S2 CFG_TMR_S3 Configure Automatic Restart CFG_RSTRT_IN_FLT CFG_RSTRT_IN_DONEA CFG_RSTRT_IN_DONEB CFG_RSTRT_IN_S3 Configure Charge Termination CFG_TERMINATE Configure Misc. CFG_SCAN_RATE_LP CFG_SCAN_RATE CFG_CHRG_MISC Configure Temperature Compensation CFG_TC3, CFG_TC2, CFG_TC1 Configure User Code CFG_USER_CODE Manufacturer Data MFR_DATA1 MFR_DATA2 MFR_DATA3 Applications Information Hardware Configuration HW Config: Input Voltage Sensing and Modulation HW Config: VINR Pin Connections HW Config: Solar Panel Powered Charging HW Config: DC Supply Powered Charging HW Config: VBAT in Stage 2 (VS2) HW Config: Input Current Sense and Limit HW Config: Output Current Sense and Limit HW Config: Current Sense Filtering HW Config: Battery Temperature and Disconnect Sensing HW Config: SHDN Pin Connections HW Config: MODE Pin – Current Conduction Mode HW Config: Driving an LED with the STATUS Pin HW Config: I2C Chip Address Pin In-Situ Battery Charging Hot-Plugging Considerations STATUS Indicator Pin Lithium-Ion Battery Charging Lead-Acid Battery Charging Optional Features Optional: Low Power Mode Optional: Output Feedback Resistor Disconnect Optional: EXTVCC Disconnect Optional: Remote Battery Voltage Sensing Optional: DC Supply Detection Circuit Board Layout Considerations Design Example Typical Applications Package Description Typical Application Related Parts
