LTC1760 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1760' PDF : 48 Pages View PDF
LTC1760
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.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIH_MODE MODE Input High Voltage (VIH)
MODE Input Current (IIH)
MODE Input Current (IIL)
Charger Timing
VVCC2 = 4.85V
MODE = VVCC2 • 0.7V, VVCC2 = 4.85V
MODE = VVCC2 • 0.3V, VVCC2 = 4.85V
l VVCC2 • 0.7
l –1
l –1
V
1
μA
1
μA
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
SMBus Timing
SCL Serial-Clock High Period(tHIGH)
SCL Serial-Clock Low Period (tLOW)
SDA/SCL Rise Time (tr)
SDA/SCL Fall Time (tf)
SMBus Accelerator Trip Voltage Range
At IPULLUP = 350μA, CLOAD = 150pF (Note 8)
At IPULLUP = 350μA, CLOAD = 150pF (Note 8)
CLOAD = 150pF, RPU = 9.31k (Note 8)
CLOAD = 150pF, RPU = 9.31k (Note 8)
tTIMEOUT_
SMB
Start-Condition Setup Time (tSU:STA)
Start-Condition Hold Time (tHD:STA)
SDA to SCL Rising-Edge
Setup Time (tSU:DAT)
SDA to SCL Falling-Edge Hold Time,
Slave Clocking in Data (tHD:DAT)
The LTC1760 will Release the SMBus
and Terminate the Current Master or
Slave Command if the Command is not
Completed Before this Time
1
sec
l
4
l 4.7
l
l
l 0.8
l 4.7
l
4
l 250
l 300
l 25
μs
μs
1000
ns
300
ns
1.42
V
μs
μs
ns
ns
35
ms
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.
1760fa
7
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