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參數(shù)資料
| 型號： | LTM8062EV#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 1150 kHz SWITCHING FREQ-MAX, PBGA77 |
| 封裝： | 15 X 9 MM, 4.32 MM HEIGHT, ROHS COMPLIANT, MO-222, LGA-77 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 580K |
| 代理商： | LTM8062EV#PBF |
LTM8062/LTM8062A
16
8062fa
APPLICATIONS INFORMATION
When a bad-battery fault is triggered, the charge cycle
is suspended, and the CHRG status pin becomes high
impedance. The FAULT pin is pulled low to signal that a
fault has been detected.
Cycling the charger’s power or shutdown function initiates
a new charge cycle, but the LTM8062/LTM8062A chargers
do not require a manual reset. Once a bad-battery fault
is detected, a new timer charge cycle initiates if the BAT
pin exceeds the precondition threshold voltage. During
a bad-battery fault, a small current is sourced from the
charger; removing the failed battery allows the charger
output voltage to rise above the preconditioning threshold
voltage and initiate a charge cycle reset. A new charge
cycle is started by connecting another battery to the
charger output.
Battery Temperature Fault: NTC
The LTM8062/LTM8062A can accommodate battery tem-
perature monitoring by using an NTC (negative tempera-
ture coefficient) thermistor close to the battery pack. The
temperaturemonitoringfunctionisenabledbyconnecting
a 10kΩ,
β ≈ 3380 NTC thermistor from the NTC pin to
ground. If the NTC function is not desired, leave the pin
open.TheNTCpinsources50μA,andmonitorsthevoltage
dropped across the 10kΩ thermistor. When the voltage
on this pin is above 1.36V (0°C) or below 0.29V (40°C),
the battery temperature is out of range, and the LTM8062/
LTM8062A trigger an NTC fault. The NTC fault condition
remains until the voltage on the NTC pin corresponds to
a temperature within the 0°C to 40°C range. Both hot and
coldthresholdsincorporate20%hysteresis,whichequates
to about 5°C. If higher operational charging temperatures
are desired, the temperature range can be expanded by
adding series resistance to the 10k NTC resistor. Adding
a 909Ω resistor will increase the effective temperature
threshold to 45°C, for example.
During an NTC fault, charging is halted and both status
pins are pulled low. If timer termination is enabled, the
timer count is suspended and held until the fault condi-
tion is cleared.
Thermal Foldback
The LTM8062/LTM8062A contains a thermal fold-
back protection feature that reduces charge current
as the IC junction temperature approaches 125°C. In
most cases, on-chip temperatures servo such that
any overtemperature conditions are relieved with
only slight reductions in maximum charge current. In
some cases, the thermal foldback protection feature
can reduce charge currents below the C/10 threshold.
In applications that use C/10 termination (TMR = 0V),
the LTM8062/LTM8062A will suspend charging and en-
ter standby mode until the overtemperature condition is
relieved.
PCB Layout
Most of the headaches associated with PCB layout have
been alleviated or even eliminated by the high level of
LTM8062/LTM8062Aintegration.TheLTM8062/LTM8062A
isneverthelessaswitchingpowersupply,andcaremustbe
taken to minimize EMI and ensure proper operation. Even
with the high level of integration, you may fail to achieve
specified operation with a haphazard or poor layout. See
Figure 7 for a suggested layout. Ensure that the grounding
and heat sinking are acceptable.
Figure 7. Suggested Layout and Via Placement
FAUL
T
ADJ
BAT
(OPTIONAL)
VIN
VINA
CHRG
GND
THERMAL VIAS
TMR
NTC
RUN VINREG
CIN
CBAT
8062 F07
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