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LTC1733 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1733 Datasheet(HTML) 7 Page - Linear Technology |
7 / 48 page LTC1760 7 1760fa SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIH_MODE MODE Input High Voltage (VIH)VVCC2 = 4.85V l VVCC2 • 0.7 V MODE Input Current (IIH) MODE = VVCC2 • 0.7V, VVCC2 = 4.85V l –1 1 μA MODE Input Current (IIL) MODE = VVCC2 • 0.3V, VVCC2 = 4.85V l –1 1 μA Charger Timing tTIMEOUT Timeout for Wake-Up Charging and Controlled Charging l 140 175 210 sec tQUERY Sampling Rate Used by the LTC1760 to Update Charging Parameters 1 sec SMBus Timing SCL Serial-Clock High Period(tHIGH) At IPULLUP = 350μA, CLOAD = 150pF (Note 8) l 4μs SCL Serial-Clock Low Period (tLOW) At IPULLUP = 350μA, CLOAD = 150pF (Note 8) l 4.7 μs SDA/SCL Rise Time (tr)CLOAD = 150pF, RPU = 9.31k (Note 8) l 1000 ns SDA/SCL Fall Time (tf)CLOAD = 150pF, RPU = 9.31k (Note 8) l 300 ns SMBus Accelerator Trip Voltage Range l 0.8 1.42 V Start-Condition Setup Time (tSU:STA) l 4.7 μs Start-Condition Hold Time (tHD:STA) l 4μs SDA to SCL Rising-Edge Setup Time (tSU:DAT) l 250 ns SDA to SCL Falling-Edge Hold Time, Slave Clocking in Data (tHD:DAT) l 300 ns tTIMEOUT_ SMB The LTC1760 will Release the SMBus and Terminate the Current Master or Slave Command if the Command is not Completed Before this Time l 25 35 ms ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C (Note 6). VDCIN = 20V, VBAT1 = 12V, VBAT2 = 12V, VVDDS = 3.3V, VVCC2 = 5.2V unless otherwise noted. Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Battery voltage must be adequate to drive gates of PowerPath P-channel FET switches. This does not affect charging voltage of the battery, which can be zero volts during wake-up charging. Note 3: DCIN, BAT1, BAT2 are held at 12V and GDCI, GB1I, GB2I are forced to 10.5V. SCP is set at 12V to measure source current at GDCI, GB1I and GB2I. SCP is set at 11.9V to measure sink current at GDCI, GB1I and GB2I. Note 4: Extrapolated from testing with CL = 50pF. Note 5: Accuracy dependent upon external sense resistor and compensation components. Note 6: The LTC1760 is tested under pulsed load conditions such that TJ ≈ TA. The LTC1760C is guaranteed to meet specifications from 0°C to 70°C junction temperature. Specifications over the –40°C to 85°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LTC1760I is guaranteed over the –40°C to 125°C operating junction temperature range. Note 7: Charger servos to the value reported by a Voltage() query. This is the internal cell voltage measured by the battery electronics and may be lower than the terminal voltage. Refer to “Operation Section 3.7” for more information. Note 8: CLOAD is the combined capacitance on the host’s SMBus connection and the selected battery’s SMBus connection. Note 9: CLOAD_MAX is the maximum allowed combined capacitance on THxA, THxB and the battery’s SafetySignalx connections. Note 10: Does not include current supplied by VCC to VCC2 (IVCC2_AC1 or IVCC2_AC0) Note 11: Measured with thermistors not present, RVLIMIT and RILIMIT removed and SMBALERT = 1. See Applications Information section: “Calculating IC Operating Current” for example on how to calculate total IC operating current. Note 12: Requested currents below 44mV/RSENSE may not servo correctly due to charger offsets. The charging current for requested currents below 4mV/RSENSE will be between 4mV/RSENSE and (Requested Current – 8mA). Refer to Applications Information: “Setting Charger Output Current Limit” for values of RSENSE. Note 13: This limit is greater than the absolute maximum for the charger. Therefore, there is no effective limitation for the voltage when this option is selected. Note 14: Does not apply to Wake-Up Mode. |
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