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参数资料
| 型号： | LTC1729CS8-8.4#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 15/16页 |
| 文件大小： | 216K |
| 代理商： | LTC1729CS8-8.4#TR |
8
LTC1729 Series
VMAX = 1V
VMIN = 0V
4.5V/CELL
BATTERY CLAMP
PULL-DOWN
ON
VMAX = 0V
VMIN = 0V
2.7V/CELL
NORMAL CHARGE
BA
TTER
Y
VOL
TAGE
VMAX = 0V
VMIN = 1V
TRICKLE CHARGE
PRECONDITIONING
1729 F04
HOLD MODE
2.79V
THERMISTOR
VOL
TAGE
HOLD MODE
0.2V
RESET MODE
NORMAL CHARGE
0.405V
1729 F05
When the input supply is removed in step-down charger
designs, the VCC pin does not drop to 0V, but is held to a
diode drop below the battery voltage. This is due to the
internal parasitic diode from the SW pin to the VCC pin that
is present in the LT1510, LT1511, LT1769, and the body
diode of the top MOSFET in the LT1505 charger. Remov-
ing the input supply will result in the VCC pin dropping
below the UVLO threshold, thus shutting down the LTC1729
and minimizing battery drain. Once the input supply is
connected, the LTC1729 resets the timers and begins
another charge cycle. There is a disconnect transistor that
will remove the OVP resistor divider from the battery when
the VCC voltage drops below the UVLO threshold.
If external circuitry is connected directly to the VCC pin and
the input power is removed, battery current will flow
through the charger’s internal parasitic diode (SW pin to
VCC pin), discharging the battery and possibly damaging
the charger if currents greater than 1A are present. If
external circuitry is used, connect it directly to the input
power source (which is the anode of the input Schottky
diode).
The logic and timer block consists of a state machine,
oscillator and counter. The state machine will be dis-
cussed in detail in the next section. The oscillator is
internally trimmed to 131kHz. The counter is composed of
a chain of 25 flip-flops that includes self-test circuitry.
Figure 4. BAT Voltage Operating Range
Figure 5. NTC Voltage Operating Range
For a battery that has been deeply discharged, the LTC1729
provides a 12mA 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 100A
bias current through the 10k
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.
APPLICATIO S I FOR ATIO
WU
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