LTC1760CFW Linear Technology, LTC1760CFW Datasheet - Page 26

• Manufacturer Part Number: LTC1760CFW
• Description: IC MANAGER BATTERY DUAL 48TSSOP
• Manufacturer: Linear Technology

Specifications of LTC1760CFW

• Function: Charge Management
• Battery Type: Smart Batteries
• Voltage - Supply: 6 V ~ 28 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-TFSOP (0.240", 6.10mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1760
OPERATIO
This bit will remain set if a subsequent AlarmWarning()
fails to respond. The cached alarm will be cleared by any
of the following conditions.
7. An SMBus Host write asserts the LTC1760
BatterySystemStateCont(CHARGING_INHIBIT) high.
8. Hardware controlled charging inhibit is asserted (MODE
low with V
9. The SMBus of the battery being charged has stopped
acknowledging SMBus read commands for longer than
t
10. The thermistor of the battery being charged indicates
HOT-RANGE.
11. Any SMBus communication line is grounded for
longer than t
12. BatterySystemStateCont(POWER_NOT_GOOD) is
high.
13. The emergency off feature has been asserted using the
DCDIV input pin.
Whenever changing conditions cause either battery to
stop charging, charging is stopped immediately for all
batteries and the voltage and current algorithms are reset
to zero. Charging is not resumed until all the conditions for
controlled charging are met.
3.6 Controlled Charging Current and Voltage
Programming
The LTC1760 monitors the requested and actual current in
each battery and increases the programmed current un-
less one of the following conditions is met:
26
TIMEOUT.
a) Associated battery is removed.
b) A subsequent AlarmWarning() clears all charge
c) A power on reset event.
d) The SMBus Host asserts
a) The actual current exceeds the requested current in
BatterySystemStateCont(CHARGER_POR) high.
alarm bits for the associated battery.
either battery.
DDS
QUERY
high).
U
.
The programmed current is updated every t
changed by the difference between the actual and re-
quested currents.
LTC(TURBO) provides a mechanism for the SMBus Host
to put additional current into both batteries. Normally the
LTC1760 will limit the current into both batteries to the
maximum of the two requested currents + I
LTC(TURBO) is asserted, this restriction is removed,
allowing the charger to output as much as I
batteries. Whenever changing conditions cause either
battery to stop charging, the current algorithm is reset to
zero.
The LTC1760 monitors the requested and actual voltages
in each battery and increases the programmed voltage by
16mV each t
are met:
This is an extremely important feature of the LTC1760
since it allows the charger to servo on the internal cell
voltage of the battery as determined by the Smart Battery.
This voltage may be significantly lower than the battery
pack terminal voltage which is used by all Level 2 chargers.
The advantage for the LTC1760 is improved charge time,
safety, and a more completely charged battery.
The voltage correction cannot exceed the minimum re-
quested voltage by more than 512mV. When decrementing,
the programmed voltage is reduced by 16mV each t
Whenever changing conditions cause either battery to
stop charging, the voltage algorithm is reset to zero.
b) The total programmed current equals the maximum
c) Only one battery is charging and the programmed
d) The total programmed current equals I
a) The actual voltage exceeds the requested voltage in
either battery.
b) The actual voltage exceeds V
of the two requested currents + I
LTC(TURBO) is de-asserted (or low).
current equals the requested current + I
QUERY
unless one of the following conditions
LIMIT
.
LIMIT
LIMIT
LIMIT
LIMIT
QUERY
LIMIT
/32. When
into both
/32 and
.
QUERY
/32.
. It is
1760f
.