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LTC1729CS8-8.4 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC1729CS8-8.4
Description  Li-Ion Battery Charger Termination Controllers
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1729CS8-8.4 Datasheet(HTML) 6 Page - Linear Technology

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6
LTC1729 Series
APPLICATIONS INFORMATION
Block Diagram
Figure 2 shows the block diagram of the LTC1729. The IC
consists of six comparators, a resistive divider, a UVLO
block and a logic and timer block.
The comparator COMP1 is used to indicate C/10 charge
current threshold. (“C” is a term used to indicate the
Ampere-hour capacity of a cell.) Figure 3 details the C/10
detection circuit. The resistor and capacitor on the SENSE
pin filter the signal from the 0.2
Ω current sense resistor
R1. The 100
µA current sink on the SENSE pin develops
20mV across the 200
Ω resistor R2. This sets a 20mV
offset on COMP1 that sense resistor R1 must equal before
C/10 current is indicated. The C/10 is not recognized by the
logic until it passes through a 3-second digital filter.
For cases where there are multiple batteries to be charged,
the LTC1729 detects when a battery is removed and resets
the timers for the next charge cycle. The battery present
detection is the primary function of comparator COMP2.
When the battery is disconnected from the LTC1729, the
voltage at the BAT pin will begin ramping upward. This is
due to a current source inside the charger or an external
pull-up resistor. Once the voltage on the BAT pin exceeds
the 4.5V/cell limit, COMP2 signals a VMAX = true to the
logic and turns on a transistor that clamps the voltage.
There is the possibility of an overvoltage transient at the
charging terminals. This occurs if the battery protection
circuit, which is often included in the battery pack, opens
the connection to the battery during high current charging
(constant-current mode). This is a result of energy storage
in the inductor. COMP2 senses the overvoltage and clamps
100
µA
50
µA
1729 F03
COMP1
STATUS
VCC
CHARGE
LED
LTC1729
SENSE
BAT
+
+
R2
200
20mV
IBIAS
20mV
R1
0.2
CHARGING
CURRENT
C1
1
µF
3-SEC
FILTER
LOGIC
AND
TIMERS
Figure 3. C/10 Detection Circuit
the VC pin, reducing the duty cycle of the charger. If the
battery protection circuit quickly returns battery connec-
tion to the charger (in less than one second), then the
LTC1729 continues charging without resetting the timers.
For a battery that has been over-discharged, the LTC1729
provides a 16mA start-up current. This preconditioning
trickle charge begins when the battery voltage drops
below 2.7V/cell. Comparator COMP3 is used to determine
when this condition exists. The battery operating range is
summarized in Figure 4.
With a 10k negative TC thermistor connected to the NTC
pin, the LTC1729 will disable charging if the temperature
is not in the 0
°C to 50°C range. A thermistor must be
present at this pin, or if the temperature qualification
feature is not used, a 10k resistor must be used in its place.
This pin should not be left open. The NTC thermistor
monitoring circuits consist of COMP4, COMP5 and COMP6.
The NTC pin voltage range is shown in Figure 5.
Comparators COMP4 and COMP5 signal the logic when
the temperature is below 0
°C or above 50°C. The 100µA
bias current through the 10k
Ω thermistor will generate
2.79V at 0
°C and 0.405V at 50°C. The voltage hysteresis
on COMP4 and COMP5 is designed to give 10
°C of
temperature hysteresis. If the voltage on the NTC pin
drops below 0.2V, the comparator COMP6 generates a
reset to the logic and timer block.
To provide accurate charge voltages, the internal resistor
divider is trimmed to provide a precise
±0.2% voltage of
2.465V at the OVP pin for the four battery voltage options
of 4.1V, 4.2V, 8.2V and 8.4V.


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