LTC1760 Datasheet, PDF (6/44 Pages) Linear Technology – Dual Smart Battery System Manager

LTC1760
ELECTRICAL CHARACTERISTICS _{The q denotes the specifications which apply over the full operating}
temperature range, otherwise specifications are at T_A = 25°C. V_DCIN = 20V, V_BAT1 = 12V, V_BAT2 = 12V, V_VDDS = 3.3V, V_VCC2 = 5.2V
unless otherwise noted.
SYMBOL
PARAMETER
SCL/SCL1/SCL2/SDA/SDA1/ SDA2/
SMBALERT Power Down Leakage.
SMBALERT Output Low Voltage (V_OL)
SMBALERT Output Pull-Up Current
V_{IL_VDDS}
V_{IH_VDDS}
V_DDS Input Low Voltage (V_IL)
V_DDS Input High Voltage (V_IH)
V_DDS Operating Voltage
V_DDS Operating Current
V_{IL_MODE} MODE Input Low Voltage (V_IL)
V_{IH_MODE} MODE Input High Voltage (V_IH)
MODE Input Current (I_IH)
MODE Input Current (I_IL)
Charger Timing
t_TIMEOUT
Timeout for Wake-Up Charging and
Controlled Charging.
t_QUERY
Sampling Rate used by the LTC1760 to
Update Charging Parameters.
SMBus Timing
SCL Serial-Clock High Period(t_HIGH)
SCL Serial-Clock Low Period (t_LOW)
SDA/SCL Rise Time(t_r)
SDA/SCL Fall Time(t_f)
SMBus Accelerator Trip Voltage Range
Start-Condition Setup Time(t_SU:STA)
Start-Condition Hold Time(t_HD:STA)
SDA to SCL Rising-Edge
Setup Time(t_SU:DAT)
SDA to SCL Falling-Edge Hold Time,
Slave Clocking in Data (t_HD:DAT)
t_{TIMEOUT_SMB} The LTC1760 will Release the SMBus
and Terminate the Current Master or
Slave Command if the Command is not
Completed Before this Time
CONDITIONS
V_VCC2 = 0V, V_VDDS = 0V,
V_SCL, V_SCL1, V_SCL2, V_SDA,
V_SDA1, V_SDA2, V_SMBALERT = 5.5V
I_PULLUP = 500µA
V_SMBALERT = 0.4V
V_SCL, V_SDA = V_VDDS , V_VDDS = 5V
V_VCC2 = 4.85V
V_VCC2 = 4.85V
MODE = V_VCC2 • 0.7V, V_VCC2 = 4.85V
MODE = V_VCC2 • 0.3V, V_VCC2 = 4.85V
At I_PULLUP = 350µA, C_LOAD = 150pF (Note 8)
At I_PULLUP = 350µA, C_LOAD = 150pF (Note 8)
C_LOAD = 150pF, RPU = 9.31k (Note 8)
C_LOAD = 150pF, RPU = 9.31k (Note 8)
MIN TYP MAX UNITS
q
2
uA
q
0.4
V
3.5
10
17.5
µA
q
q 2.6
q
3
1.5
V
V
5.5
V
18
µA
q
q V_VCC2 • 0.7
q
–1
V_VCC2 • 0.3
V
V
1
µA
q
–1
1
µA
q 140
175
210
sec
1
sec
q
4
q 4.7
q
q
q 0.8
q 4.7
q
4
q 250
q 300
q
25
µs
µs
1000
ns
300
ns
1.42
V
µs
µs
ns
ns
35
ms
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2. Battery voltage must be adequate to drive gates of power path
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 C_L = 50pF.
Note 5. Accuracy dependent upon external sense resistor and
compensation components.
Note 6. The LTC1760C is guaranteed to meet specified performance from
0°C to 70°C and is designed, characterized and expected to meet specified
performance at –40°C and 85°C, but is not tested at these extended
temperature limits.
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. See “Operation Section 3.6” for more
information.
6
sn1760 1760is