User manual

LTC4100
5
4100fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
DCIN
= 20V, V
DD
= 3.3V, V
BAT
= 12V unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Logic Levels
V
IL
SCL/SDA Input Low Voltage V
DD
= 3V and V
DD
= 5.5V
●
0.8 V
V
IH
SCL/SDA Input High Voltage V
DD
= 3V and V
DD
= 5.5V
●
2.1 V
V
OL
SDA Output Low Voltage I
PULL-UP
= 350µA
●
0.4 V
I
IL
SCL/SDA Input Current V
SDA
, V
SCL
= V
IL
–1 1 µA
I
IH
SCL/SDA Input Current V
SDA
, V
SCL
= V
IH
–1 1 µA
V
OL
SMBALERT Output Low Voltage I
PULL-UP
= 500µA
●
0.4 V
SMBALERT Output Pull-Up Current V
SMBALERT
= V
OL
–17.5 –10 –3.5 µA
I
LEAK
SDA/SCL/SMBALERT Power Down Leakage V
SDA
, V
SCL
, V
SMBALERT
= 5.5V, V
DD
= OV
●
–2 2 µA
V
OL
CHGEN Output Low Voltage I
OL
= 100µA
●
0.5 V
CHGEN Output Pull-Up Current V
CHGEN
= V
OL
–17.5 –10 –3.5 µA
V
IL
CHGEN Input Low Voltage
●
0.9 V
V
IH
CHGEN Input High Voltage V
DD
= 3V
V
DD
= 5.5V
●
2.5
3.9
V
V
Power-On Reset Duration V
DD
Ramp from 0V to >3V in <5µs 100 µs
SMBus Timing (Refer to System Management Bus Specifi cation, Revision 1.1, Section 2.1 for Timing Diagrams)
t
HIGH
SCL Serial Clock High Period I
PULL-UP
= 350µA, C
LOAD
= 250pF,
R
PU
= 9.31k, V
DD
= 3V and V
DD
= 5.5V
●
4µs
t
LOW
SCL Serial Clock Low Period I
PULL-UP
= 350µA, C
LOAD
= 250pF,
R
PU
= 9.31k, V
DD
= 3V and V
DD
= 5.5V
●
4.7 15000 µs
t
R
SDA/SCL Rise Time C
LOAD
= 250pF, R
PU
= 9.31k, V
DD
= 3V and
V
DD
= 5.5V
●
1000 ns
t
F
SDA/SCL Fall Time C
LOAD
= 250pF, R
PU
= 9.31k, V
DD
= 3V and
V
DD
= 5.5V
●
300 ns
t
SU:STA
Start Condition Setup Time V
DD
= 3V and V
DD
= 5.5V
●
4.7 µs
t
HD:STA
Start Condition Hold Time V
DD
= 3V and V
DD
= 5.5V
●
4µs
t
HD:DAT
SDA to SCL Falling-Edge Hold Time, Slave
Clocking in Data
V
DD
= 3V and V
DD
= 5.5V
●
300 ns
t
TIMEOUT
Time Between Receiving Valid ChargingCurrent()
and ChargingVoltage() Commands
V
DD
= 3V and V
DD
= 5.5V
●
140 175 210 sec
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: See Test Circuit.
Note 3: Does not include tolerance of current sense resistor.
Note 4: The LTC4100E is guaranteed to meet performance specifi cations
from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 5: Current accuracy dependent upon circuit compensation and sense
resistor.
Note 6: C
TH
is defi ned as the sum of capacitance on THA, THB and
SafetySignal.
Note 7: The corresponding overrange bit will be set when a HEX value
greater than or equal to this value is used.